• Journal of Electrical Engineering and information Science
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• v.1 no.1
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• pp.10-16
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• 1996

In this paper, we have analyzed the error performance of the optimum threshold detection(OTD) of 16 QAM signal in the Rician fading channel with and without the maximal ratio combining(MRC) diversity technique in the presence of cochannel Rayleigh interference. An also the error performance of OTD is compared to that of conventional threshold detection(CTD) in the Rician fading channel in the presence of cochannel Rayleigh interference. With the result of analysis, it is found that there exists a synergistic effect due to both MRC diversity and optimum threshold detection in the Rician fading channel in the presence of cochannel Rayleigh interference.

• Proceedings of the Korean Institute of Communication Sciences Conference
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• 1998.06a
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• pp.1033-1036
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• 1998

• Proceedings of the Korean Institute of Communication Sciences Conference
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• 1994.06a
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• pp.547-550
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• 1994

• Proceedings of the Korean Institute of Communication Sciences Conference
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• 1995.10a
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• pp.36-40
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• 1995

• Proceedings of the Korean Institute of Communication Sciences Conference
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• 1995.10a
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• pp.32-35
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• 1995

• Proceedings of the Korean Institute of Communication Sciences Conference
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• 1995.10a
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• pp.758-762
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• 1995

• Proceedings of the Korean Institute of Communication Sciences Conference
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• 1987.10a
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• pp.130-138
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• 1987

• Proceedings of the Korean Institute of Communication Sciences Conference
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• 1996.06a
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• pp.597-600
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• 1996

• Journal of the Institute of Electronics Engineers of Korea TC
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• v.38 no.11
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• pp.41-48
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• 2001

The exact general bit error rate (TIER) expression of M-ary square quadrature amplitude modulation (QAM) for arbitrary M has not been derived so far. In this paper, a generalized closed-form expression for the BER performance of M-ary square QAM with Gray code bit mapping is derived and analyzed in the presence of additive white Gaussian noise (AWGN) channel. The derivation is based on the consistency of the format in signal constellation o[ Gray coding and it has been derived from the results for M-16, 64, and 256.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.29 no.3A
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• pp.324-330
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• 2004

In this paper, we propose the TCM(Trellis coded modulation) decoding scheme that reduces the number of operations in branch metric with STBC(space time block codes) channel information and present the implementation results. The proposed TCM decoding scheme needs only 1 signal point in each TCM subset. Using bias point scheme, It detects the minimum distance symbol. The proposed TCM decoding scheme can reduce the branch metric calculations. In case of 16QAM 8 subset, the reduction ratio is about 50％ and for 64QAM 8 subset, about 80％ reduction can be obtained. The results of logic synthesis for the TCM and STBC decoder with the proposed scheme are 57.6K gate count.