Pulse or digital communications – Receivers – Particular pulse demodulator or detector
Reexamination Certificate
2004-11-29
2008-11-18
Payne, David C (Department: 2611)
Pulse or digital communications
Receivers
Particular pulse demodulator or detector
C375S316000, C714S780000
Reexamination Certificate
active
07453959
ABSTRACT:
Disclosed is an apparatus and method for erasure detection and soft-decision decoding in a cellular system receiver. In the present invention, a complex channel gain and a noise variance of a received symbol from a cellular system transmitter are estimated, and an erasure symbol (a symbol with high power interference) is detected by comparing a threshold value according to the estimated complex channel gain or noise variance with power of the received symbol. Log-likelihood ratios corresponding to constituent bits of the detected erasure symbols are allowed to be 0, and the log-likelihood ratios of the constituent bits of the other received symbols are calculated. A soft-decision decoding operation of received bits is performed with the calculated log-likelihood ratios.
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Ahn Jae-Young
Kim Kwang-Soon
Kim Yun-Hee
Lee Sang-Hyun
Blakely , Sokoloff, Taylor & Zafman LLP
Electronics and Telecommunications Research Institute
Payne David C
Stevens Brian J
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