Fast space-time decoding using soft demapping with table...

Details Fast space-time decoding using soft demapping with table... Fast space-time decoding using soft demapping with table...

2003-06-27

2008-03-25

Burd, Kevin (Department: 2611)

Pulse or digital communications

Receivers

Particular pulse demodulator or detector

Reexamination Certificate

active

07349496

ABSTRACT:
From potential symbol combinations transmitted from a transmitter, Euclidean distances between the received signals and the symbol vectors are determined in light of the corresponding channel responses and stored in a Euclidean distance table, from which the smallest Euclidean distance is selected as a hard decision. The hard decision is used to find a bit vector corresponding to the estimated symbol vector associated with the hard decision. For each bit in the bit vector, a reduced Euclidean distance table is created to include only Euclidean distances associated with a competing bit associated with the hard decision. The minimum Euclidean distance from each reduced Euclidean distance table becomes a soft demapping decision for a corresponding bit. Log likelihood ratios for each bit are determined by the difference between the hard decision and respective soft demapping decisions. The differences are provided to a channel decoder to recover the originally transmitted bits.

REFERENCES:
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Stefanov et al. “Turbo-coded Modulation for Systems with Transmit and Receive Antenna Diversity Over Block Fading Channels: System Model, Decoding Approaches, and practical Considerations”, IEEE Journals on Selected Areas in Communications, IEEE Inc. New York, vol. 19, No. 5, May 2001 (pp. 958-968).

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