US 10,897,335 B2 · Signaling of precoder-related information in a MIMO system

Abstract

Systems and methods for signaling a pattern of cyclic shifts and orthogonal cover codes for use by a wireless device in multi-layer transmissions are presented. In one exemplary embodiment, a method includes receiving a signal that includes B bits for identifying a reference signal. Each of several available reference signals are defined by a cyclic shift and an orthogonal cover code. Further, the method includes using the B bits to identify the cyclic shift and orthogonal cover code according to pre-determined tables that map each value of the B bits to a pattern of cyclic shift and orthogonal cover code combinations for a multi-layer transmission scheme. The patterns for the multi-layer transmission scheme include first and second patterns based on the same cyclic shifts, but where some, but not all, of the cyclic shifts in the first pattern are associated with the same corresponding orthogonal cover codes in the second pattern. In addition, the method includes transmitting each of the one or more spatially multiplexed data streams using a corresponding reference signal for each data stream.

Claims31

Dependent claims

A method, implemented in a wireless device, for transmitting reference signals, wherein each of a plurality of available reference signals is defined by a cyclic shift and a corresponding orthogonal cover code, the method comprising:

receiving a signal including a pattern index of B bits for identifying at least one reference signal for use by the wireless device in transmissions;
using the pattern index to identify the cyclic shift and orthogonal cover code to be used in transmitting each of one or more spatially multiplexed data streams, according to one or more pre-determined tables that map each value of the pattern index to a pattern of cyclic shift and orthogonal cover code combinations for a first multi-layer transmission scenario, wherein the pattern of cyclic shift and orthogonal cover code combinations specified for the first multi-layer transmission scenario includes a first pattern for use in transmitting a first number of layers, and a second pattern, different from the first pattern, for use in transmitting a second different number of layers, wherein the first and second patterns are based on the same set of cyclic shifts, and wherein the orthogonal cover codes are the same for each transmission layer in the first pattern but vary across the transmission layers in the second pattern;
and
transmitting each of the one or more spatially multiplexed data streams using a corresponding reference signal for each data stream.

1 more element

A wireless device configured to transmit reference signals, wherein each of a plurality of available reference signals is defined by a cyclic shift and a corresponding orthogonal cover code, the wireless device comprising:

a processing circuit configured to:
receive a signal including a pattern index of B bits for identifying at least one reference signal for use by the wireless device in transmissions;
and
use the pattern index of B bits to identify the cyclic shift and orthogonal cover code to be used in transmitting each of one or more spatially multiplexed data streams, according to one or more pre-determined tables that map each value of the B bits to a pattern of cyclic shift and orthogonal cover code combinations for a first multi-layer transmission scenario, wherein the pattern of cyclic shift and orthogonal cover code combinations specified for the first multi-layer transmission scenario includes a first pattern for use in transmitting a first number of layers, and a second pattern, different from the first pattern, for use in transmitting a second different number of layers, wherein the first and second patterns are based on the same set of cyclic shifts, and wherein the orthogonal cover codes are the same for each transmission layer in the first pattern but vary across the transmission layers in the second pattern;
and
a radio circuit configured to transmit each of the one or more spatially multiplexed data streams using a corresponding reference signal for each data stream.

3 more elements

A method, implemented in a first wireless node, for signaling a second wireless node, the method comprising:

selecting a first group of B bits to identify a cyclic shift and orthogonal cover code to be used by the second wireless node in transmitting each of one or more spatially multiplexed data streams, according to one or more pre-determined tables that map each value of the first group of B bits to a pattern of cyclic shift and orthogonal cover code combinations for a first multi-layer transmission scenario, wherein the pattern of cyclic shift and orthogonal cover code combinations specified for the first multi-layer transmission scenario includes a first pattern for use in transmitting a first number of layers, and a second pattern, different from the first pattern, for use in transmitting a second different number of layers, wherein the first and second patterns are based on the same set of cyclic shifts, and wherein the orthogonal cover codes are the same for each transmission layer in the first pattern but vary across the transmission layers in the second pattern;
and
transmitting a signal including the first group of B bits for identifying at least one reference signal for use by the second wireless node in transmissions.

A first wireless node configured to communicate with a second wireless node in a wireless network, the first wireless node comprising:

a processing circuit configured to select a first group of B bits to identify a cyclic shift and orthogonal cover code to be used by the second wireless node in transmitting each of one or more spatially multiplexed data streams, according to one or more pre-determined tables that map each value of the first group of B bits to a pattern of cyclic shift and orthogonal cover code combinations for a first multi-layer transmission scenario, wherein the pattern of cyclic shift and orthogonal cover code combinations specified for the first multi-layer transmission scenario includes a first pattern for use in transmitting a first number of layers, and a second pattern, different from the first pattern, for use in transmitting a second different number of layers, wherein the first and second patterns are based on the same set of cyclic shifts, and wherein the orthogonal cover codes are the same for each transmission layer in the first pattern but vary across the transmission layers in the second pattern;
and
a radio circuit configured to transmit a signal including the first group of B bits for identifying at least one reference signal for use by the second wireless node in transmissions.

Dependencies are inferred from the claim text.

Signaling of precoder-related information in a MIMO system

Life of this patent

Signaling of precoder-related information in a MIMO system

Life of this patent

Abstract

Claims31