Adaptive modulation and coding with multicodes over Nakagami fading channels

TitleAdaptive modulation and coding with multicodes over Nakagami fading channels
Publication TypeConference Paper
Year of Publication2005
AuthorsKwan, R., and C. Leung
Conference NameWireless Communications and Networking Conference, 2005 IEEE
Pagination927 - 932 Vol. 2
Date Publishedmar.
Keywords3G mobile communication, 3GPP standard, adaptive codes, adaptive coding, adaptive modulation, adaptive modulation and coding, AMC, bit rate performance, CDMA system, cellular radio, channel estimation, channel estimation errors, channel state, code division multiple access, fading channels, generalized Marcum Q-function, modulation coding, multicodes, Nakagami fading channels, spectral efficiency, third generation cellular networks

Adaptive modulation and coding (AMC) has been adopted in the 3GPP standard in order to improve spectral efficiency. In order to increase the granularity of the adaptation and to provide higher bit rates, multicode transmission is employed. Since the use of AMC requires knowledge of the channel state, the accuracy of this information is important. In practice, errors in estimating the channel state are inevitable, resulting in performance degradation. The average bit rate performance of AMC with multicodes is studied for a CDMA system experiencing Nakagami fading and channel estimation errors. The results are obtained in terms of the generalized Marcum Q-function. Numerical results are provided to illustrate the performance degradations due to inaccuracies in estimating the channel.


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