# US 10,375,647 B2 · Energy-efficient sounding reference signal transmission

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- Number: US 10,375,647 B2
- Document ID: US10375647B2
- Status: Granted
- Kind: B2
- Application number: 15/531,906
- Filed: 2017-05-18
- Published: 2018-11-22
- Granted: 2019-08-06
- Earliest claimed: 2017-05-18
- Assignees: Telefonaktiebolaget LM Ericsson (publ)
- Applicants: Telefonaktiebolaget LM Ericsson (publ)
- Inventors: Andres Reial; Fredrik Athley; Andreas Nilsson; Sven Petersson
- Web page: https://patentgrep.com/patent/US10375647B2

## CPC

- H04W 52/0274: {by switching on or off the equipment or parts thereof}
- H04B 17/309: Measuring or estimating channel quality parameters
- H04W 52/0225: {using monitoring of external events, e.g. the presence of a signal}
- H04W 52/028: {switching on or off only a part of the equipment circuit blocks}
- Y02D 30/70: in wireless communication networks
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)
- H04B: TRANSMISSION
- Y02D: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE

## Abstract

An energy efficient UE 100 comprising a plurality of antenna ports 110 is provided by enabling selective deactivation of at least some transmission chain(s) associated with the antenna port(s) 110 that are not transmitting signals, e.g., SRSs and/or other wireless signals. The UE 100 determines how quickly/how much each channel associated with each antenna port 110 changes, and identifies a subset of antenna ports having a rate of change estimate that satisfies a rate of change requirement as being part of a deactivation subset of antenna ports 110. The UE 100 not only ceases transmitting signals from the antenna ports 110 in the deactivation subset, but also deactivates each of the transmission chains 122 operatively connected to the antenna ports 110 in the deactivation subset. In so doing, the UE 100 eliminates unnecessary power consumption without unduly impacting performance.

## Claims

### Claim 1

A method, implemented by a wireless communication device, of selectively controlling transmissions from the wireless communication device, said wireless communication device in communication with an access node of a wireless network, the method comprising:
receiving a signal at each of a plurality of antenna ports, each antenna port operatively connected to:
a reception chain comprising a plurality of reception circuits configured to process signals received from the corresponding antenna port; and
a transmission chain comprising a plurality of transmission circuits configured to generate a signal for transmission from the corresponding antenna port;
processing each received signal to estimate a rate of change for a channel associated with the corresponding antenna port;
defining a deactivation subset of antenna ports as comprising the antenna ports of the plurality of antenna ports having a rate of change estimate that satisfies a transmitter rate of change requirement; and
deactivating each of the transmission chains operatively connected to the antenna ports in the deactivation subset;
wherein deactivating the transmission chains operatively connected to the antenna ports in the deactivation subset comprises deactivating all active transmission circuits in each transmission chain operatively connected to the antenna ports in the deactivation subset.

### Claim 2 (depends on 1)

The method of claim 1 further comprising processing each received signal to estimate a signal quality for each received signal, wherein defining the deactivation subset comprises defining the deactivation subset as comprising the antenna ports in the plurality of antenna ports having a signal quality estimate that fails a signal quality requirement and having a rate of change estimate that satisfies the rate of change requirement.

### Claim 3 (depends on 2)

The method of claim 2 wherein defining the deactivation subset comprises:
defining an initial subset of antenna ports as comprising the antenna ports in the plurality of antenna ports having a signal quality estimate that fails the signal quality requirement; and
defining the deactivation subset as comprising the antenna ports in the initial subset having a rate of change estimate that satisfies the rate of change requirement.

### Claim 4 (depends on 1)

The method of claim 1 further comprising determining a time limit responsive to at least one of the rate of change estimates and a transient time associated with the transmission chains, wherein deactivating the transmission chains comprises deactivating the transmission chains operatively connected to the antenna ports in the deactivation subset for the time limit.

### Claim 5 (depends on 1)

The method of claim 1 further comprising defining the deactivation subset as comprising the antenna ports having the rate of change estimates that satisfy the rate of change requirement and that are operatively connected to non-adjacent transmission chains.

### Claim 6 (depends on 1)

The method of claim 1 wherein the transmission chains are disposed on a die such that adjacent antenna ports do not operatively connect to adjacent transmission chains on the die.

### Claim 7 (depends on 1)

The method of claim 1 further comprising transmitting signals from one or more of the antenna ports not in the deactivation subset.

### Claim 8 (depends on 7)

The method of claim 7 wherein transmitting the signals comprises transmitting reference signals from one or more of the antenna ports not in the deactivation subset.

### Claim 9 (depends on 7)

The method of claim 7 wherein transmitting the signals comprises transmitting data signals from one or more of the antenna ports not in the deactivation subset.

### Claim 10 (depends on 1)

The method of claim 1 further comprising:
defining a receiver deactivation subset of antenna ports as comprising the antenna ports of the plurality of antenna ports having a rate of change estimate that satisfies a receiver rate of change requirement; and
deactivating each of the reception chains operatively connected to the antenna ports in the receiver deactivation subset.

### Claim 11 (depends on 10)

The method of claim 10 wherein the receiver rate of change requirement is different from the transmitter rate of change requirement.

### Claim 12 (depends on 10)

The method of claim 10 further comprising processing each rate of change for the channel to determine a channel coherence time of the channel associated with the corresponding antenna port, wherein deactivating each of the reception chains operatively connected to the antenna ports in the receiver deactivation subset comprises deactivating each of the reception chains operatively connected to the antenna ports in the receiver deactivation subset for a time duration less than the corresponding channel coherence time.

### Claim 13 (depends on 1)

The method of claim 1 wherein the rate of change estimate comprises at least one of a rate of change of a Doppler frequency and a rate of change of movement of the wireless communication device.

### Claim 14

A computer program product stored in a non-transitory computer readable medium for controlling a wireless communication device to selectively control transmissions from the wireless communication device, said wireless communication device in communication with an access node of a wireless network, the computer program product comprising software instructions which, when run on at least one processing circuit in the wireless communication device, causes the wireless communication device to:
receive a signal at each of a plurality of antenna ports, each antenna port operatively connected to:
a reception chain comprising a plurality of reception circuits configured to process signals received from the corresponding antenna port; and
a transmission chain comprising a plurality of transmission circuits configured to generate a signal for transmission from the corresponding antenna port;
process each received signal to estimate a rate of change for a channel associated with the corresponding antenna port;
define a deactivation subset of antenna ports as comprising the antenna ports of the plurality of antenna ports having a rate of change estimate that satisfies a transmitter rate of change requirement; and
deactivate each of the transmission chains operatively connected to the antenna ports in the deactivation subset;
wherein deactivating the transmission chains operatively connected to the antenna ports in the deactivation subset comprises deactivating all active transmission circuits in each transmission chain operatively connected to the antenna ports in the deactivation subset.

### Claim 15

A wireless communication device configured to selectively control transmissions from the wireless communication device, said wireless communication device in communication with an access node of a wireless network, the wireless communication device comprising:
a plurality of antenna ports, each antenna port operatively connected to:
a reception chain comprising a plurality of reception circuits configured to process signals received from the corresponding antenna port; and
a transmission chain comprising a plurality of transmission circuits configured to generate a signal for transmission from the corresponding antenna port;
an analysis circuit operatively connected to each reception chain and each transmission chain, the analysis circuit configured to process each signal received by a corresponding antenna port to estimate a rate of change for a channel associated with the corresponding antenna port; and
a deactivation circuit operatively connected to the analysis circuit and to each reception and transmission chain, the deactivation circuit configured to:
define a deactivation subset of antenna ports as comprising the antenna ports of the plurality of antenna ports having a rate of change estimate that satisfies a transmitter rate of change requirement; and
deactivate each of the transmission chains operatively connected to the antenna ports in the deactivation subset;
wherein the deactivation circuit deactivates the transmission chains operatively connected to the antenna ports in the deactivation subset by deactivating all active transmission circuits in each transmission chain operatively connected to the antenna ports in the deactivation subset.

### Claim 16 (depends on 15)

The wireless communication device of claim 15 wherein the analysis circuit is further configured to process each received signal to estimate a signal quality for each received signal, and wherein the deactivation circuit defines the deactivation subset by defining the deactivation subset as comprising the antenna ports in the plurality of antenna ports having a signal quality estimate that fails a signal quality requirement and having a rate of change estimate that satisfies the rate of change requirement.

### Claim 17 (depends on 16)

The wireless communication device of claim 16 wherein the deactivation circuit defines the deactivation subset by:
defining an initial subset of antenna ports as comprising the antenna ports in the plurality of antenna ports having a signal quality estimate that fails the signal quality requirement; and
defining the deactivation subset as comprising the antenna ports in the initial subset having a rate of change estimate that satisfies the rate of change requirement.

### Claim 18 (depends on 15)

The wireless communication device of claim 15 wherein one or more antenna ports not in the deactivating subset are configured to transmit signals.

### Claim 19 (depends on 18)

The wireless communication device of claim 18 wherein one or more of the antenna ports not in the deactivation subset transmit the signals by transmitting reference signals.

### Claim 20 (depends on 18)

The wireless communication device of claim 18 wherein one or more of the antenna ports not in the deactivation subset transmit the signals by transmitting data signals.

### Claim 21 (depends on 15)

The wireless communication device of claim 15 wherein the deactivation circuit is further configured to:
define a receiver deactivation subset of antenna ports as comprising the antenna of the plurality of antenna ports having a rate of change estimate that satisfies a receiver rate of change requirement; and
deactivate each of the reception chains operatively connected to the antenna ports in the receiver deactivation subset.

### Claim 22 (depends on 21)

The wireless communication device of claim 21 wherein the receiver rate of change requirement is different from the transmitter rate of change requirement.

### Claim 23 (depends on 21)

The wireless communication device of claim 21 wherein the analysis circuit is further configured to process each rate of change for the channel to determine a channel coherence time of the channel associated with the corresponding antenna port, and wherein the deactivation circuit deactivates each of the reception chains operatively connected to the antenna ports in the receiver deactivation subset by deactivating each of the reception chains operatively connected to the antenna ports in the receiver deactivation subset for a time duration less than the corresponding channel coherence time.

### Claim 24 (depends on 15)

The wireless communication device of claim 15 wherein the rate of change estimate comprises at least one of a rate of change of a Doppler frequency and a rate of change of movement of the wireless communication device.

### Claim 25

A method, implemented by a wireless communication device, of selectively controlling transmissions from the wireless communication device, said wireless communication device in communication with an access node of a wireless network, the method comprising:
receiving a signal at each of a plurality of antenna ports, each antenna port operatively connected to:
a reception chain comprising a plurality of reception circuits configured to process signals received from the corresponding antenna port; and
a transmission chain comprising a plurality of transmission circuits configured to generate a signal for transmission from the corresponding antenna port;
processing each received signal to estimate a rate of change for a channel associated with the corresponding antenna port;
defining a deactivation subset of antenna ports as comprising the antenna ports of the plurality of antenna ports having a rate of change estimate that satisfies a transmitter rate of change requirement;
deactivating each of the transmission chains operatively connected to the antenna ports in the deactivation subset; and
processing each received signal to estimate a signal quality for each received signal, wherein defining the deactivation subset comprises defining the deactivation subset as comprising the antenna ports in the plurality of antenna ports having a signal quality estimate that fails a signal quality requirement and having a rate of change estimate that satisfies the rate of change requirement;
wherein defining the deactivation subset comprises:
defining an initial subset of antenna ports as comprising the antenna ports in the plurality of antenna ports having a signal quality estimate that fails the signal quality requirement; and
defining the deactivation subset as comprising the antenna ports in the initial subset having a rate of change estimate that satisfies the rate of change requirement.

### Claim 26 (depends on 25)

The method of claim 25 wherein the signal quality requirement comprises a signal quality threshold and wherein the rate of change requirement comprises a rate of change threshold, and wherein defining the deactivation subset comprises:
defining the initial subset of antenna ports as comprising the antenna ports in the plurality of antenna ports having a signal quality estimate less than the signal quality threshold; and
defining the deactivation subset as comprising the antenna ports in the initial subset having a rate of change estimate less than the rate of change threshold.

### Claim 27 (depends on 25)

The method of claim 25 wherein deactivating each of the transmission chains operatively connected to the antenna ports in the deactivation subset comprises deactivating at least one of the transmission circuits in each transmission chain operatively connected to the antenna ports in the deactivation subset.

### Claim 28 (depends on 25)

The method of claim 25 wherein deactivating the transmission chains operatively connected to the antenna ports in the deactivation subset comprises deactivating the transmission chains operatively connected to the antenna ports in the deactivation subset for a predetermined amount of time.

### Claim 29 (depends on 28)

The method of claim 28 further comprising reactivating each transmission chain operatively connected to the antenna ports in the deactivation subset after expiration of the predetermined amount of time.

### Claim 30

A method, implemented by a wireless communication device, of selectively controlling transmissions from the wireless communication device, said wireless communication device in communication with an access node of a wireless network, the method comprising:
receiving a signal at each of a plurality of antenna ports, each antenna port operatively connected to:
a reception chain comprising a plurality of reception circuits configured to process signals received from the corresponding antenna port; and
a transmission chain comprising a plurality of transmission circuits configured to generate a signal for transmission from the corresponding antenna port;
processing each received signal to estimate a rate of change for a channel associated with the corresponding antenna port;
defining a deactivation subset of antenna ports as comprising the antenna ports of the plurality of antenna ports having a rate of change estimate that satisfies a transmitter rate of change requirement;
deactivating each of the transmission chains operatively connected to the antenna ports in the deactivation subset; and
determining a time limit responsive to at least one of the rate of change estimates and a transient time associated with the transmission chains, wherein deactivating the transmission chains comprises deactivating the transmission chains operatively connected to the antenna ports in the deactivation subset for the time limit.

### Claim 31

A wireless communication device configured to selectively control transmissions from the wireless communication device, said wireless communication device in communication with an access node of a wireless network, the wireless communication device comprising:
a plurality of antenna ports, each antenna port operatively connected to:
a reception chain comprising a plurality of reception circuits configured to process signals received from the corresponding antenna port; and
a transmission chain comprising a plurality of transmission circuits configured to generate a signal for transmission from the corresponding antenna port;
an analysis circuit operatively connected to each reception chain and each transmission chain, the analysis circuit configured to process each signal received by a corresponding antenna port to estimate a rate of change for a channel associated with the corresponding antenna port; and
a deactivation circuit operatively connected to the analysis circuit and to each reception and transmission chain, the deactivation circuit configured to:
define a deactivation subset of antenna ports as comprising the antenna ports of the plurality of antenna ports having a rate of change estimate that satisfies a transmitter rate of change requirement; and
deactivate each of the transmission chains operatively connected to the antenna ports in the deactivation subset;
wherein the analysis circuit is further configured to process each received signal to estimate a signal quality for each received signal, and wherein the deactivation circuit defines the deactivation subset by defining the deactivation subset as comprising the antenna ports in the plurality of antenna ports having a signal quality estimate that fails a signal quality requirement and having a rate of change estimate that satisfies the rate of change requirement; and
wherein the deactivation circuit defines the deactivation subset by:
defining an initial subset of antenna ports as comprising the antenna ports in the plurality of antenna ports having a signal quality estimate that fails the signal quality requirement; and
defining the deactivation subset as comprising the antenna ports in the initial subset having a rate of change estimate that satisfies the rate of change requirement.

### Claim 32 (depends on 31)

The wireless communication device of claim 31 wherein the signal quality requirement comprises a signal quality threshold and wherein the rate of change requirement comprises a rate of change threshold, and wherein the deactivation circuit defines the deactivation subset by:
defining the initial subset of antenna ports as comprising the antenna ports in the plurality of antenna ports having a signal quality estimate less than the signal quality threshold; and
defining the deactivation subset as comprising the antenna ports in the initial subset having a rate of change estimate less than the rate of change threshold.

### Claim 33 (depends on 31)

The wireless communication device of claim 31 wherein the deactivation circuit deactivates each of the transmission chains operatively connected to the antenna ports in the deactivation subset by deactivating at least one of the transmission circuits in each transmission chain operatively connected to the antenna ports in the deactivation subset.

### Claim 34 (depends on 31)

The wireless communication device of claim 31 wherein the deactivation circuit deactivates the transmission chains operatively connected to the antenna ports in the deactivation subset by deactivating the transmission chains operatively connected to the antenna ports in the deactivation subset for a predetermined amount of time.

### Claim 35 (depends on 15)

The wireless communication device of claim 15 further comprising a timing circuit configured to determine a time limit responsive to at least one of the rate of change estimates and a transient time associated with the transmission chains, wherein the deactivation circuit deactivates the transmission chains by deactivating the transmission chains operatively connected to the antenna ports in the deactivation subset for the time limit.

### Claim 36 (depends on 15)

The wireless communication device of claim 15 wherein the deactivation circuit is further configured to define the deactivation subset as comprising the antenna ports that are operatively connected to non-adjacent transmission chains.

### Claim 37 (depends on 15)

The wireless communication device of claim 15 wherein the transmission chains are disposed on a die such that adjacent transmission chains on the die do not connect to adjacent antenna ports.

### Claim 38

A wireless communication device configured to selectively control transmissions from the wireless communication device, said wireless communication device in communication with an access node of a wireless network, the wireless communication device comprising:
a plurality of antenna ports, each antenna port operatively connected to:
a reception chain comprising a plurality of reception circuits configured to process signals received from the corresponding antenna port; and
a transmission chain comprising a plurality of transmission circuits configured to generate a signal for transmission from the corresponding antenna port;
an analysis circuit operatively connected to each reception chain and each transmission chain, the analysis circuit configured to process each signal received by a corresponding antenna port to estimate a rate of change for a channel associated with the corresponding antenna port; and
a deactivation circuit operatively connected to the analysis circuit and to each reception and transmission chain, the deactivation circuit configured to:
define a deactivation subset of antenna ports as comprising the antenna ports of the plurality of antenna ports having a rate of change estimate that satisfies a transmitter rate of change requirement; and
deactivate each of the transmission chains operatively connected to the antenna ports in the deactivation subset;
wherein the deactivation circuit deactivates the transmission chains operatively connected to the antenna ports in the deactivation subset by deactivating the transmission chains operatively connected to the antenna ports in the deactivation subset for a predetermined amount of time.

### Claim 39 (depends on 38)

The wireless communication device of claim 38 wherein the deactivation circuit is further configured to reactivate each transmission chain operatively connected to the antenna ports in the deactivation subset after expiration of the predetermined amount of time.

### Claim 40

A wireless communication device configured to selectively control transmissions from the wireless communication device, said wireless communication device in communication with an access node of a wireless network, the wireless communication device comprising:
a plurality of antenna ports, each antenna port operatively connected to:
a reception chain comprising a plurality of reception circuits configured to process signals received from the corresponding antenna port; and
a transmission chain comprising a plurality of transmission circuits configured to generate a signal for transmission from the corresponding antenna port;
an analysis circuit operatively connected to each reception chain and each transmission chain, the analysis circuit configured to process each signal received by a corresponding antenna port to estimate a rate of change for a channel associated with the corresponding antenna port;
a deactivation circuit operatively connected to the analysis circuit and to each reception and transmission chain, the deactivation circuit configured to:
define a deactivation subset of antenna ports as comprising the antenna ports of the plurality of antenna ports having a rate of change estimate that satisfies a transmitter rate of change requirement; and
deactivate each of the transmission chains operatively connected to the antenna ports in the deactivation subset; and
a timing circuit configured to determine a time limit responsive to at least one of the rate of change estimates and a transient time associated with the transmission chains, wherein the deactivation circuit deactivates the transmission chains by deactivating the transmission chains operatively connected to the antenna ports in the deactivation subset for the time limit.

### Claim 41

A wireless communication device configured to selectively control transmissions from the wireless communication device, said wireless communication device in communication with an access node of a wireless network, the wireless communication device comprising:
a plurality of antenna ports, each antenna port operatively connected to:
a reception chain comprising a plurality of reception circuits configured to process signals received from the corresponding antenna port; and
a transmission chain comprising a plurality of transmission circuits configured to generate a signal for transmission from the corresponding antenna port;
an analysis circuit operatively connected to each reception chain and each transmission chain, the analysis circuit configured to process each signal received by a corresponding antenna port to estimate a rate of change for a channel associated with the corresponding antenna port; and
a deactivation circuit operatively connected to the analysis circuit and to each reception and transmission chain, the deactivation circuit configured to:
define a deactivation subset of antenna ports as comprising the antenna ports of the plurality of antenna ports having a rate of change estimate that satisfies a transmitter rate of change requirement; and
deactivate each of the transmission chains operatively connected to the antenna ports in the deactivation subset;
wherein the deactivation circuit is further configured to define the deactivation subset as comprising the antenna ports that are operatively connected to non-adjacent transmission chains.

### Claim 42

A wireless communication device configured to selectively control transmissions from the wireless communication device, said wireless communication device in communication with an access node of a wireless network, the wireless communication device comprising:
a plurality of antenna ports, each antenna port operatively connected to:
a reception chain comprising a plurality of reception circuits configured to process signals received from the corresponding antenna port; and
a transmission chain comprising a plurality of transmission circuits configured to generate a signal for transmission from the corresponding antenna port;
an analysis circuit operatively connected to each reception chain and each transmission chain, the analysis circuit configured to process each signal received by a corresponding antenna port to estimate a rate of change for a channel associated with the corresponding antenna port; and
a deactivation circuit operatively connected to the analysis circuit and to each reception and transmission chain, the deactivation circuit configured to:
define a deactivation subset of antenna ports as comprising the antenna ports of the plurality of antenna ports having a rate of change estimate that satisfies a transmitter rate of change requirement; and
deactivate each of the transmission chains operatively connected to the antenna ports in the deactivation subset;
wherein the transmission chains are disposed on a die such that adjacent transmission chains on the die do not connect to adjacent antenna ports.

### Claim 43

A wireless communication device configured to selectively control transmissions from the wireless communication device, said wireless communication device in communication with an access node of a wireless network, the wireless communication device comprising:
a plurality of antenna ports, each antenna port operatively connected to:
a reception chain comprising a plurality of reception circuits configured to process signals received from the corresponding antenna port; and
a transmission chain comprising a plurality of transmission circuits configured to generate a signal for transmission from the corresponding antenna port;
an analysis circuit operatively connected to each reception chain and each transmission chain, the analysis circuit configured to process each signal received by a corresponding antenna port to estimate a rate of change for a channel associated with the corresponding antenna port; and
a deactivation circuit operatively connected to the analysis circuit and to each reception and transmission chain, the deactivation circuit configured to:
define a deactivation subset of antenna ports as comprising the antenna ports of the plurality of antenna ports having a rate of change estimate that satisfies a transmitter rate of change requirement; and
deactivate each of the transmission chains operatively connected to the antenna ports in the deactivation subset;
wherein the deactivation circuit is further configured to:
define a receiver deactivation subset of antenna ports as comprising the antenna of the plurality of antenna ports having a rate of change estimate that satisfies a receiver rate of change requirement; and
deactivate each of the reception chains operatively connected to the antenna ports in the receiver deactivation subset;
wherein the receiver rate of change requirement is different from the transmitter rate of change requirement.

### Claim 44

A wireless communication device configured to selectively control transmissions from the wireless communication device, said wireless communication device in communication with an access node of a wireless network, the wireless communication device comprising:
a plurality of antenna ports, each antenna port operatively connected to:
a reception chain comprising a plurality of reception circuits configured to process signals received from the corresponding antenna port; and
a transmission chain comprising a plurality of transmission circuits configured to generate a signal for transmission from the corresponding antenna port;
an analysis circuit operatively connected to each reception chain and each transmission chain, the analysis circuit configured to process each signal received by a corresponding antenna port to estimate a rate of change for a channel associated with the corresponding antenna port; and
a deactivation circuit operatively connected to the analysis circuit and to each reception and transmission chain, the deactivation circuit configured to:
define a deactivation subset of antenna ports as comprising the antenna ports of the plurality of antenna ports having a rate of change estimate that satisfies a transmitter rate of change requirement; and
deactivate each of the transmission chains operatively connected to the antenna ports in the deactivation subset;
wherein the deactivation circuit is further configured to:
define a receiver deactivation subset of antenna ports as comprising the antenna of the plurality of antenna ports having a rate of change estimate that satisfies a receiver rate of change requirement; and
deactivate each of the reception chains operatively connected to the antenna ports in the receiver deactivation subset; and
wherein the analysis circuit is further configured to process each rate of change for the channel to determine a channel coherence time of the channel associated with the corresponding antenna port, and wherein the deactivation circuit deactivates each of the reception chains operatively connected to the antenna ports in the receiver deactivation subset by deactivating each of the reception chains operatively connected to the antenna ports in the receiver deactivation subset for a time duration less than the corresponding channel coherence time.