US 8,498,361 B1Granted

Channel tracking in a wireless MIMO communication system

AssigneeMarvell International Ltd.

InventorsKonstantinos Sarrigeorgidis, Kedar Shirali

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Abstract

An estimate of a multiple input, multiple output (MIMO) channel is computed, and an equalizer to be applied to signals received via the MIMO channel is computed. The equalizer is initialized based on the estimate of the MIMO channel. The equalizer is applied to a received signal, and the received signal is demodulated to generate a demodulated signal. The demodulated signal is decoded according to an error correction code to generate decoded data, and the decoded data is re-encoded according to the error correction code to generate re-encoded data. The re-encoded data is re-modulated to generate a re-modulated signal. The received signal is compared to the re-modulated signal, and the equalizer is updated based on the comparison. After updating the equalizer, the equalizer is applied to the received signal.

Claims20

Dependent claims

A method of channel tracking, the method comprising:

computing, with a transceiver device, an estimate of a multiple input, multiple output (MIMO) channel;
computing, with a matrix equalizer computational device of the transceiver device when the matrix equalizer computational device is not needed for equalization, an equalizer to be applied to signals received via the MIMO channel, wherein the equalizer is initialized based on the estimate of the MIMO channel;
applying, with the matrix equalizer computational device, the equalizer to a received signal;
demodulating, with the transceiver device, the received signal to generate a demodulated signal;
decoding, with the transceiver device, the demodulated signal according to an error correction code to generate decoded data;
re-encoding, with the transceiver device, the decoded data according to the error correction code to generate re-encoded data;
re-modulating, with the transceiver device, the re-encoded data to generate a re-modulated signal;
comparing, with the transceiver device, the received signal to the re-modulated signal;
updating, with the-transceiver device, the equalizer based on comparing the received signal to the re-modulated signal;
and
after updating the equalizer, applying, with the matrix equalizer computational device, the equalizer to the received signal.

8 more elements

An apparatus, comprising:

a plurality of antennas;
and
a transceiver coupled to the plurality of antennas, the transceiver configured to
compute an estimate of a multiple input, multiple output (MIMO) channel,
compute an equalizer to be applied to signals received via the MIMO channel, wherein the equalizer is initialized based on the estimate of the MIMO channel,
apply the equalizer to a received signal received via the plurality of antennas,
demodulate the received signal to generate a demodulated signal,
decode the demodulated signal according to an error correction code to generate decoded data,
re-encode the decoded data according to the error correction code to generate re-encoded data,
re-modulate the re-encoded data to generate a re-modulated signal,
compare the received signal to the re-modulated signal,
update the equalizer based on comparing the received signal to the modulated signal, and
after updating the equalizer, apply the equalizer to the received signal;
wherein the transceiver includes a matrix equalizer computational device configured to:
apply the equalizer to the received signal, and
compute the equalizer when the matrix equalizer computational device is not needed for equalization.

13 more elements

Dependencies are inferred from the claim text.

Facts

Application: 13/493,160Filed 11 Jun 2012 · continuation
Priority: 26 Apr 2007
Granted: 30 Jul 2013
Term ends: Not estimatedThe source records don’t support an estimate.

Classification16 codes

H04L 25/03891
Shaping networks in transmitter or receiver, e.g. adaptive shaping networks: spatial equalizers
H04B 7/0413
Using two or more spaced independent antennas: mIMO systems
H04L 1/004
Arrangements for detecting or preventing errors in the information received: by using forward error control
H04L 1/005
Decoding adapted to other signal detection operation: iterative decoding, including iteration between signal detection and decoding operation