US 8,897,274 B2Granted

Successive interference cancellation stacked branch VAMOS receivers

AssigneeST-Ericsson SA

InventorNaveen Jacob

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Abstract

A receiver receives a desired radio sub-channel transmitted with an unwanted radio sub-channel by producing signal branches from a received radio signal by treating orthogonal components of the received signal separately and also by using one or both of oversampling and multiple receive antennas. Channel estimates for both the desired and unwanted radio sub-channels are produced for signal branches. The unwanted radio sub-channel bits are estimated from a non-stacked form of the received radio signal. The channel estimates and the estimate of the unwanted radio sub-channel bits are used to reconstruct unwanted radio sub-channel components separately for signal branches. Desired radio sub-channel signal branches are produced by subtracting a corresponding one of the reconstructed unwanted radio sub-channel components from signal branches. A non-stacked desired signal is produced by combining the desired radio sub-channel signal branches. The non-stacked desired signal is processed to receive the desired radio sub-channel.

Claims18

Dependent claims

A method of receiving a desired radio sub-channel transmitted by a transmitter during a time slot, wherein an unwanted radio sub-channel is also transmitted by the transmitter during the time slot and wherein the desired radio sub-channel and unwanted radio sub-channel are orthogonal to one another at a time of transmission, the method comprising:

receiving a radio signal during the time slot, wherein the radio signal comprises the desired radio sub-channel and unwanted radio sub-channel;
producing a plurality of signal branches from the received radio signal by treating orthogonal components of the received radio signal as separate branches and also by generating separate signal branches by one or both of oversampling and using multiple receive antennas;
using joint channel estimation to independently process more than one of the plurality of signal branches and to produce therefrom for each of the more than one of the plurality of signal branches a channel estimate for the desired radio sub-channel and a channel estimate for the unwanted radio sub-channel;
producing an estimate of unwanted radio sub-channel bits from a non-stacked form of the received radio signal;
using the channel estimates and the estimate of the unwanted radio sub-channel bits to reconstruct unwanted radio sub-channel components for each of the more than one of the plurality of signal branches;
producing desired radio sub-channel signal branches by subtracting a corresponding one of the reconstructed unwanted radio sub-channel components from each of the more than one of the plurality of signal branches;
producing a non-stacked desired signal by combining the desired radio sub-channel signal branches;
and
processing the non-stacked desired signal to receive the desired radio sub-channel.

6 more elements

An apparatus for receiving a desired radio sub-channel transmitted by a transmitter during a time slot, wherein an unwanted radio sub-channel is also transmitted by the transmitter during the time slot and wherein the desired radio sub-channel and unwanted radio sub-channel are orthogonal to one another at a time of transmission, the apparatus comprising:

radio circuitry configured to receive a radio signal during the time slot, wherein the radio signal comprises the desired radio sub-channel and unwanted radio sub-channel;
circuitry configured to produce a plurality of signal branches from the received radio signal by treating orthogonal components of the received radio signal as separate branches and also by generating separate signal branches by one or both of oversampling and using multiple receive antennas;
circuitry configured to use joint channel estimation to independently process more than one of the plurality of signal branches and to produce therefrom for each of the more than one of the plurality of signal branches a channel estimate for the desired radio sub-channel and a channel estimate for the unwanted radio sub-channel;
circuitry configured to produce an estimate of the unwanted radio sub-channel bits from a non-stacked form of the received radio signal;
circuitry configured to use the channel estimates and the estimate of the unwanted radio sub-channel bits to reconstruct unwanted radio sub-channel components for each of the more than one of the plurality of signal branches;
circuitry configured to produce desired radio sub-channel signal branches by subtracting a corresponding one of the reconstructed unwanted radio sub-channel components from each of the more than one of the plurality of signal branches;
circuitry configured to produce a non-stacked desired signal by combining the desired radio sub-channel signal branches;
and
circuitry configured to process the non-stacked desired signal to receive the desired radio sub-channel.

6 more elements

Dependencies are inferred from the claim text.

Facts

Application: 13/785,107Filed 5 Mar 2013 · us provisional application
Priority: 8 Aug 2012
Published: US 2014/0044107 A113 Feb 2014
Granted: 25 Nov 2014
Term ends: Not estimatedThe source records don’t support an estimate.

Classification8 codes

H04B 1/1027
Means associated with receiver for limiting or suppressing noise or interference: assessing signal quality or detecting noise/interference for the…
H04L 5/12
Channels characterised by the type of signal: the signals being represented by different phase modulations of a single carrier
H04L 25/0202
Details ; arrangements for supplying electrical power along data transmission lines: channel estimation
H04L 25/03006
Shaping networks in transmitter or receiver, e.g. adaptive shaping networks: arrangements for removing intersymbol interference