Pulse or digital communications – Receivers – Particular pulse demodulator or detector
Patent
1995-08-31
1999-11-30
Ghebretinsae, Temesghen
Pulse or digital communications
Receivers
Particular pulse demodulator or detector
371 36, 371 691, H03D 100
Patent
active
059955597
ABSTRACT:
Instead of simply taking a bit-wise majority vote of several received encoded data words and decoding the result of the vote, the chances of usefully decoding a word may be increased by decoding every word received. If a received word is decoded as correct or with a corrected one-bit error or with a corrected two-bit error, this decoded word can be used as the received word. Also, bit-wise majority votes can be taken on all combinations of small groups of the received words, and the results passed to the decoder. If the decoder reports a correct word or a word having a one-bit or two-bit error corrected for one of these combinations, this can be used as the received word. Error-correction beyond the typical capabilities of a BCH code can be realized if the error-correction decoder is properly configured. "Word-wise" majority voting is also described. The probability of accurately determining a word that was actually transmitted from several repetitions of the word received after passage through a corrupting communication channel, especially for situations in which short bursts of erroneous data are received, is increased.
REFERENCES:
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A. Targi et al., "Error and Throughput Performance of Multidecoded Erasure-Based Direct Sequence/Time Hopping Selection Diversity Multiaccess Systems," IEEE International Conference on Communications ICC/Supercomm 90, vol. 4, pp. 1527-1533 (Apr. 16-19, 1990).
R. Blahut, Theory and Practice of Error Control Codes, chapt. 7, Addison-Wesley, Reading, MA (1983).
"CMS 88 Cellular Mobile Telephone System", pub. No. EN/LZT 101 908 R2B, chapt. 4, Ericsson Telecom AB (1988).
Ghebretinsae Temesghen
Telefonaktiebolaget LM Ericsson
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