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US 2009/0213966 A1Published application
System and Method for Generating Soft Output in Hybrid MIMO Systems
AssigneeMitsubishi Electric Research Laboratories, Inc.
InventorsKoon Hoo Teo, Ronghui Peng, Jinyun Zhang
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Abstract
A hybrid soft output MIMO detector uses a QR decomposition detector followed by a Markov chain Monte Carlo detector. The QRD-M generates initial candidate decision vectors, which are used as input for the Markov chain Monte Carlo detection to generate the soft output.
Claims11
A method for generating soft output for a received signal in a multiple input, multiple output (MIMO) receiver, comprising:
- estimating a channel matrix H from signals y received at a plurality of antennas via corresponding channels;
- decomposing, using M parameters, the channel matrix H to obtain a unitary matrix Q and upper triangular matrix R;
- determining, in a QRD-M detection unit, a set of candidate decision vectors based on the matrices Q and R and the received signals y;
- determining, in a Markov chain Monte Carlo (MCMC) detection emit, an important subset of the set of candidate decision vectors;
- and
- determining, in a log-likelihood ratio unit, a soft output using the important subset.
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A transceiver including a transmitter and a receiver each of which is configured to be connectable to a set of antennas, and in which the receiver comprises:
- means for estimating a channel matrix H from signals y received at a plurality of antennas via corresponding channels;
- means for decomposing, using M parameters, the channel matrix H to obtain a unitary matrix Q and upper triangular matrix R;
- means for determining, in a QRD-M detection unit, a set of candidate decision vectors based on the matrices Q and R and the received signals y;
- means for determining, in a Markov chain Monte Carlo (MCMC) detection unit, an important subset of the set of candidate decision vectors;
- and
- means for determining, in a log-likelihood ratio unit, a soft output using the important subset.
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Dependencies are inferred from the claim text.