Method and Apparatus for Symbol Detection via Reduced Complexity Sequence Estimation Processing
AssigneeTelefonaktiebolaget L M Ericsson (publ)
InventorGregory E. Bottomley
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Abstract
Teachings presented herein offer the performance advantages of sequence estimation for received signal symbol detection, while simultaneously providing potentially significant reductions in computational overhead. Initial demodulation of a received signal identifies a reduced number of candidate symbol values for all or a subset of a sequence of symbols represented in a received signal. A sequence estimation process, e.g., an MLSE process, constrains its state spaces to the reduced number of candidate symbols values, rather than considering all possible symbol values.
Claims25
A method of detecting a sequence of symbols in a received signal comprising:
- determining a reduced number of possible symbol values for the sequence of symbols by initially demodulating the received signal and detecting candidate symbol values for all or a subset of the sequence of symbols;
- and
- detecting the sequence of received symbols by processing the received signal in a sequence estimation process that is constrained to the reduced number of possible symbol values.
A demodulator for detecting a sequence of symbols in a received signal comprising:
- an initial demodulator configured to determine a reduced number of possible symbol values for the sequence of symbols by initially demodulating the received signal and detecting candidate symbol values for all or a subset of the sequence of symbols;
- and
- a sequence estimator configured to detect the sequence of received symbols by processing the received signal in a sequence estimation process that is constrained to the reduced number of possible symbol values.
A method of detecting a sequence of symbols in a received signal comprising:
- identifying a reduced number of possible symbol values for the sequence of symbols by initially demodulating the received signal and detecting candidate symbol values for all or a subset of the sequence of symbols;
- and
- detecting which ones of the candidate symbol values best represent the sequence of symbols by processing the received signal in a sequence estimation process that is constrained to state spaces defined by the candidate symbol values.
Dependencies are inferred from the claim text.