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Title: Adaptive MAPSD algorithms for symbol and timing recovery of mobile radio TDMA signals
Authors: Giridhar, K.
Shynk, J.J.
Iltis, R.A.
Mathur, A.
Keywords: Adaptive algorithms
Cellular radio systems
Communication channels (information theory)
Computational complexity
Computer simulation
Digital filters
Diversity reception
Kalman filtering
Radio receivers
Signal detection
Frequency selective fading channels
Maximum a posteriori symbol detection
Symbol timing
Time division multiple access
Timing jitter
Mobile radio systems
Issue Date: 1996
Citation: IEEE Transactions on Communications, 44(8), 976-987
Abstract: Dual-mode adaptive algorithms with rapid convergence properties are presented for the equalization of frequency selective fading channels and the recovery of time-division multiple access (TDMA) mobile radio signals. The dual-mode structure consists of an auxiliary adaptive filter that estimates the channel during the training cycle. The converged filter weights are used to initialize a parallel bank of filters that are adapted blindly during the data cycle. When the symbol timing is known, this filter bank generates error residuals that are used to perform approximate maximum a posteriori symbol detection (MAPSD) and provide reliable decisions of the transmitted signal. For channels with timing jitter, joint estimation of the channel parameters and the symbol timing using an extended Kaiman filter algorithm is proposed. Various methods are described to reduce the computational complexity of the MAP detector, usually at the cost of some performance degradation. Also, a blind MAPSD algorithm for combining signals from spatially diverse receivers is derived. This diversity MAPSD (DMAPSD) algorithm, which can be easily modified for the dual-mode TDMA application, maintains a global set of MAP metrics even while blindly tracking the individual spatial channels using local error estimates. The performance of these single-channel and diversity MAPSD dualmode algorithms are studied via computer simulations for various channel models, including a mobile radio channel simulator for the IS-54 digital cellular TDMA standard. ? 1996 IEEE.
ISSN: 906778
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