Coding method and use of a receiver with a convolutional...

Details Coding method and use of a receiver with a convolutional... Coding method and use of a receiver with a convolutional...

2007-03-06

2007-03-06

Tran, Khai (Department: 2611)

Pulse or digital communications

Receivers

Particular pulse demodulator or detector

C375S264000, C332S103000, C329S304000

Reexamination Certificate

active

10204299

ABSTRACT:
A coding method for modulating carrier signals with 16 different digital states (4 bit signals) possesses a high synchronicity robustness and an at least partially improved coding gain. The coding parameters are obtained by the following steps: a) using a 2 ASK/8 PSK coding; b) choosing a convolutional code and determining all possible code word sequences with the free distance of the convolutional code; c) producing possible mappings by allocating a partial quantity of the 2 ASK/8 PSK channel bits to subsets; d) choosing the mapping at which, after determination of the optimum radii of the two amplitudes for every possible mapping, the resulting minimum Euclidean distance takes a maximum value between two possible subset sequences code word sequence.

REFERENCES:
patent: 5931965 (1999-08-01), Alamouti
patent: 6005897 (1999-12-01), McCallister et al.
Hayashi, S. et al: Performance of Trellis-Coded 16-State Differentially Encoded APSK on Rayleigh Fading Channel, IEEE, Nov. 6, 1995, pp. 32-36.
Lau, H. K. et al: A Pilot Symbol-Aided Technique Used For Digital Signals In Multipath Environments, ICC, May 1, 1994, pp. 1126-1130.

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