Unambiguously encoding and decoding signals for wireless...

Details Unambiguously encoding and decoding signals for wireless... Unambiguously encoding and decoding signals for wireless...

2008-05-20

2008-05-20

Liu, Shuwang (Department: 2611)

Pulse or digital communications

Spread spectrum

Direct sequence

C375S130000, C375S140000, C375S303000, C455S042000, C455S043000, C455S044000, C455S045000, C370S203000, C708S403000, C708S404000, C708S405000

Reexamination Certificate

active

10950772

ABSTRACT:
A method encodes a sequence of blocks of input bits to be transmitted over a wireless channel. Each block of input bits is converted to a codeword, and each codeword is mapped to multiple sub-blocks of complex numbers. Each sub-block is multiplied by a disambiguating spreading transform to obtain a sub-block of transformed symbols, which can be modulated and transmitted to a receiver, where each received block is demodulated to a block of complex numbers, which are partitioned into sub-blocks. The sub-block of complex numbers are converted to a set of likelihood ratios that correspond to decoded codewords. The input bits can be decoded unambiguously even if only one of the blocks of symbols corresponding to the block of input bits is received correctly.

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