Information generation for coherent demodulation of differentially encoded signals
AssigneeEricsson Inc.
InventorsHüseyin Arslan, Gregory E. Bottomley, Rajaram Ramésh
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Abstract
Methods and systems are provided which generate hard and soft values from signal samples of a differentially encoded signal by estimating channel coefficients associated with the received signal and determining metrics for each possible symbol pair which indicate the probability of a possible coherent symbol pair being encoded in the signal samples using the estimated channel coefficients and the signal samples. Soft values associated with differential bits or differential symbols encoded in the samples of the signal are then generated based on the determined metrics.
Claims78
A method of generating differential values from signal samples of a differentially encoded received signal, the method comprising:
- estimating channel coefficients associated with the received signal;
- determining metrics for each possible coherent symbol pair which indicate the probability of a possible coherent symbol pair being encoded in the received signal using the estimated channel coefficients and the signal samples of the received signal;
- and
- determining differential values associated with information differentially encoded in the received signal based on the determined metrics.
A method of generating differential values from signal samples of a differentially encoded received signal, the method comprising:
- estimating channel coefficients associated with the received signal;
- determining metrics for each possible pair of coherent symbol values which indicate the probability of a possible symbol pair being encoded in the signal samples of the received signal using the estimated channel coefficients and the signal samples;
- determining the extremum metrics of the metrics for each possible symbol pair corresponding to a differential values to provided extremum metrics;
- and
- determining a differential value based on the extremum metrics.
A method of generating differential values from signal samples of a differentially encoded received signal, the method comprising:
- estimating channel coefficients associated with the received signal;
- determining detected coherent symbol values based on the received signal samples and the channel coefficients;
- determining a detected metric based on detected symbol values corresponding to a first and a second symbol period, the received samples and the channel coefficients;
- determining a first potential non-detected metric based on a detected symbol corresponding to the first symbol period, the received samples and the channel coefficients;
- determining a second potential non-detected metric based on a detected symbol corresponding to the second symbol period, the received samples and the channel coefficients;
- determining a selected non-detected metric using the extremum of the first and second potential non-detected metrics;
- and
- determining at least one differential value based on the detected metric and the selected non-detected metric.
An apparatus for generating differential values from signal samples of a differentially encoded received signal, comprising:
- means for estimating channel coefficients associated with the received signal;
- means for determining metrics for each possible coherent symbol pair which indicate the probability of a possible coherent symbol pair being encoded in the received signal using the estimated channel coefficients and the signal samples of the received signal;
- and
- means for determining differential values associated with information differentially encoded in the received signal based on the determined metrics.
An apparatus for generating differential values from signal samples of a differentially encoded received signal, comprising:
- means for estimating channel coefficients associated with the received signal;
- means for determining metrics for each possible pairs of coherent symbol values which indicate the probability of a possible symbol pair being encoded in the signal samples of the received signal using the estimated channel coefficients and the signal samples;
- means for determining the extremum metrics of the metrics for each possible symbol pair corresponding to a differential values to provided extremum metrics;
- and
- means for determining a differential value based on the extremum metrics.
An apparatus for generating differential values from signal samples of a differentially encoded received signal, comprising:
- means for estimating channel coefficients associated with the received signal;
- means for determining detected coherent symbol values based on the received signal samples and the channel coefficients;
- means for determining a detected metric based on detected symbol values corresponding to a first and a second symbol period, the received samples and the channel coefficients;
- means for determining a first potential non-detected metric based on a detected symbol corresponding to the first symbol period, the received samples and the channel coefficients;
- means for determining a second potential non-detected metric based on a detected symbol corresponding to the second symbol period, the received samples and the channel coefficients;
- means for determining a selected non-detected metric using the extremum of the first and second potential non-detected metrics;
- and
- means for determining at least one differential value based on the detected metric and the selected non-detected metric.
A method of generating differential values from signal samples of a differentially encoded received signal, the method comprising:
- estimating channel coefficients associated with the received signal;
- determining detected coherent symbol metrics corresponding to a first and second symbol period based on signal samples of the received signal and the channel coefficients;
- determining toggled coherent symbol metrics corresponding to a first and second symbol period based on signal samples of the received signal and the channel coefficients;
- and
- determining at least on differential value based on the detected coherent symbol metrics and the toggled coherent symbol metrics.
An apparatus for generating differential values from signal samples of a differentially encoded received signal, comprising:
- means for estimating channel coefficients associated with the received signal;
- means for determining detected coherent symbol metrics corresponding to a first and second symbol period based on signal samples of the received signal and the channel coefficients;
- means for determining toggled coherent symbol metrics corresponding to a first and second symbol period based on signal samples of the received signal and the channel coefficients;
- and
- means for determining at least on differential value based on the detected coherent symbol metrics and the toggled coherent symbol metrics.
Dependencies are inferred from the claim text.