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Please use this identifier to cite or link to this item: http://hdl.handle.net/10204/3913

Title: Discrete polyphase matched filtering-based soft timing estimation for mobile wireless systems
Authors: Olwal, TO
Van Wyk, MA
Van Wyk, BJ
Keywords: Discrete polyphase matched filters
Maximum likelihood estimators
Soft timing phase estimation
Wireless mobile systems
Wireless cellular communication
Soft-output viterbi algorithm
Issue Date: 2009
Publisher: World Academy of Science, Engineering and Technology
Citation: Olwal, TO, Van Wyk. MA and Van Wyk, BJ. 2009. Discrete polyphase matched filtering-based soft timing estimation for mobile wireless systems. International Journal of Electronics, Communications and Computer Engineering, Vol.1(2), pp 123-130
Abstract: In this paper the authors present a soft timing phase estimation (STPE) method for wireless mobile receivers operating in low signal to noise ratios (SNRs). Discrete Polyphase Matched (DPM) filters, a Log-maximum a posterior probability (MAP) and/or a Soft-output Viterbi algorithm (SOVA) are combined to derive a new timing recovery (TR) scheme. The authors apply this scheme to wireless cellular communication system model that comprises of a raised cosine filter (RCF), a bit-interleaved turbo-coded multi-level modulation (BITMM) scheme and the channel is assumed to be memory-less. Furthermore, no clock signals are transmitted to the receiver contrary to the classical data aided (DA) models. This new model ensures that both the bandwidth and power of the communication system is conserved. However, the computational complexity of ideal turbo synchronization is increased by 50%. Several simulation tests on bit error rate (BER) and block error rate (BLER) versus low SNR reveal that the proposed iterative soft timing recovery (ISTR) scheme outperforms the conventional schemes.
Description: Copyright: 2009 World Academy of Science, Engineering and Technology
URI: http://hdl.handle.net/10204/3913
ISSN: 2073-0543
Appears in Collections:Wireless technologies
General science, engineering & technology

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