Reduced state sequence estimation with soft decision outputs
AssigneeMagnaCom Ltd.
InventorsAmir Eliaz, Ilan Reuven
Life of this patent
Estimating the term…
Abstract
A receiver may be operable to receive an inter-symbol correlated (ISC) signal, and generate a plurality of soft decisions as to information carried in the ISC signal. The soft decisions may be generated using a reduced-state sequence estimation (RSSE) process. The RSSE process may be such that the number of symbol survivors retained after each iteration of the RSSE process is less than the maximum likelihood state space. The plurality of soft decisions may comprise a plurality of log likelihood ratios (LLRs). Each of the plurality of LLRs may correspond to a respective one of a plurality of subwords of a forward error correction (FEC) codeword.
Claims21
1-20. (canceled)
A system comprising:
- signal processing circuitry and sequence estimation circuitry, wherein:
- said signal processing circuitry is operable to receive an inter-symbol correlated signal resulting from a transmitted plurality of symbols, each of said plurality of symbols corresponding to a plurality of subwords;
- said signal processing circuitry is operable to output samples of said received inter-symbol correlated signal to said sequence estimation circuitry;
- said sequence estimation circuitry is operable to process said samples using a sequence estimation process in which each iteration of said sequence estimation process comprises generation of multiple survivor vectors;
- and
- said sequence estimation circuitry is operable to generate soft-decisions as to values of said symbols and/or said subwords based on a count of occurrences of a particular symbol and/or subword value in said multiple survivor vectors.
The method of claim 32, wherein said weight applied to said one of said occurrences is based on a metric calculated for said one of said multiple survivors.
The method of claim 31, wherein:
- when said one of said multiple survivors is a first survivor having a first metric, said weight applied to said one of said occurrences is a first weight based on said first metric;
- and
- when said one of said multiple survivors is a second survivor having a second metric, said weight applied to said one of said occurrences is a second weight based on said second metric.
A method comprising:
- performing in a receiver comprising signal processing circuitry and sequence estimation circuitry:
- receiving, by said signal processing circuitry, an inter-symbol correlated signal resulting from a transmitted plurality of symbols, each of said plurality of symbols corresponding to a plurality of subwords;
- outputting, by said signal processing circuitry, samples of said received inter-symbol correlated signal to said sequence estimation circuitry;
- processing, by said sequence estimation circuitry, said samples using a sequence estimation process in which each iteration of said sequence estimation process comprises generating multiple survivor vectors;
- and
- generating, by said sequence estimation circuitry, soft-decisions as to values of said symbols and/or said subwords based on a count of occurrences of a particular symbol and/or subword value in said multiple survivor vectors.
Dependencies are inferred from the claim text.