Pulse or digital communications – Spread spectrum – Direct sequence
Reexamination Certificate
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
07376173
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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Molisch Andreas F.
Pedagani Karunakar
Yedidia Jonathan S.
Brinkman Dirk
Lam Kenneth
Liu Shuwang
Mitsubishi Electric Research Laboratories Inc.
Mueller Clifton D.
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