Method, apparatus and computer program product providing soft iterative recursive least squares (RLS) channel estimator
First Claim
Patent Images
1. A method, comprising:
- detecting a received signal for one of a structured irregular low-density parity-check (LDPC) code multiple-input-multiple-output (MIMO) orthogonal frequency division multiplex (OFDM) system and an iterative LDPC-coded MIMO-OFDM system; and
iteratively determining an extrinsic output for the received signal at a channel decoder based on a current a posteriori probability (APP), such that each iteration comprises;
determining the current APP at a soft data detector based at least in part on a prior extrinsic output from the channel decoder and a soft channel estimate from an iterative Recursive Least Squares-based channel estimator, the prior extrinsic output and the soft channel estimate each determined based on a prior APP.
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Abstract
Disclosed is an apparatus having a detector for an iterative LDPC-coded MIMO-OFDM system, where the detector is configured to use a structured irregular LDPC code in conjunction with a belief propagation algorithm. Also disclosed is an apparatus having a detector for a structured irregular LDPC-coded MIMO-OFDM system, where the detector is configured to use an iterative Recursive Least Squares-based data detection and channel estimation technique. Corresponding methods and computer program products are also disclosed.
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Citations
13 Claims
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1. A method, comprising:
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detecting a received signal for one of a structured irregular low-density parity-check (LDPC) code multiple-input-multiple-output (MIMO) orthogonal frequency division multiplex (OFDM) system and an iterative LDPC-coded MIMO-OFDM system; and iteratively determining an extrinsic output for the received signal at a channel decoder based on a current a posteriori probability (APP), such that each iteration comprises; determining the current APP at a soft data detector based at least in part on a prior extrinsic output from the channel decoder and a soft channel estimate from an iterative Recursive Least Squares-based channel estimator, the prior extrinsic output and the soft channel estimate each determined based on a prior APP. - View Dependent Claims (2, 3, 4)
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5. An apparatus, comprising:
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a soft data detector configured to detect a received signal for at least one of a structured irregular low-density parity-check (LDPC) coded multiple-input-multiple-output (MIMO) orthogonal frequency division multiplex (OFDM) system and an iterative LDPC-coded MIMO-OFDM system; an iterative Recursive Least Squares-based channel estimator configured to determine a soft channel estimate; and a channel decoder configured to iteratively determine an extrinsic output for the received signal based on a current a posteriori probability (APP), whererin for each iteration, the current APP is determined at the soft data detector based at least in part on a prior extrinsic output from the channel decoder and a soft channel estimate from the iterative Recursive Least Squares-based channel estimator, the prior extrinsic output and the soft channel estimate each determined based on a prior APP. - View Dependent Claims (6, 7, 8, 9)
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10. A computer program product comprising instructions embodied in a tangible data storage medium, execution of the instructions by a data processor resulting in an operation of:
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detecting a received signal for one of a structured irregular low-density parity-check (LDPC) coded multiple-input-multiple-output (MIMO) orthogonal frequency division multiplex (OFDM) system and an iterative LDPC-coded MIMO-OFDM system; and iteratively determining an extrinsic output for the received signal at a channel decoder based on a current a posteriori probability (APP), such that each iteration comprises; determining the current APP at a soft data detector based at least in part on a prior extrinsic output from the channel decoder and a soft channel estimate from an iterative Recursive Least Squares-based channel estimator, the prior extrinsic output and the soft channel estimate each determined based on a prior APP. - View Dependent Claims (11, 12, 13)
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Specification