Journal ArticleDOI
An analysis of pilot symbol assisted modulation for Rayleigh fading channels (mobile radio)
TLDR
In this paper, the bit error rate in binary-phase-shift-keying (BPSK) and in quadrature phase-shift keying (QPSK), for a tight upper bound on the symbol error rate for 16-QAM was presented.Abstract:
The author presents pilot-symbol-assisted modulation (PSAM) on a solid analytical basis, a feature missing from previous work. Closed-form expressions are presented for the bit error rate (BER) in binary-phase-shift-keying (BPSK) and in quadrature-phase-shift-keying (QPSK), for a tight upper bound on the symbol error rate in 16 quadrature-amplitude-modulation (16-QAM), and for the optimized receiver coefficients. The error rates obtained are lower than for differential detection for any combination of signal-to-noise ratio (SNR) and Doppler spread, and the performance is within 1 dB of a perfect reference system under slow-fading conditions and within 3 dB when the Doppler spread is 5% of the symbol rate. >read more
Citations
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Journal ArticleDOI
Impact of Channel Estimation Errors on SC-FDE Systems
TL;DR: A modified IB-DFE is proposed which incorporates knowledge of the channel estimation error model and its performance becomes more robust against the presence of strong error components in the channel estimates.
Proceedings ArticleDOI
Multiuser channel estimation for detection of cochannel signals
S.J. Grant,James K. Cavers +1 more
TL;DR: A pilot-based technique for multiuser channel estimation in a TDMA system is addressed, which allows for time variation of the channels within and between training sequences, it accounts for colouration of the sampled noise sequence as well as correlation between the channel taps, and considers users to be asynchronous resulting in a technique whereby explicit timing recovery is unnecessary.
Journal ArticleDOI
Switching Rate and Dwell Time in M-of-N Selection Diversity
James K. Cavers,Paul Ho +1 more
TL;DR: Analytical results on the switching rate and average dwell time of a selection diversity receiver where M out of a total of N independent branches are selected for combining suggest that HS/MRC should be frame-based, rather than continuously acting in time.
Journal ArticleDOI
Diversity combining for DS/SS systems with time-varying, correlated fading branches
Wen Gao,S. Tsai,James S. Lehnert +2 more
TL;DR: A new algorithm with only forward-time recursions is proposed that approximates the iterative EM solution and efficiently adapts to slowly changing Doppler spreads and significantly reduces memory and training sequence requirements.
Proceedings ArticleDOI
Channel estimation with selective superimposed pilot sequences under fast fading environments
Fumiaki Tsuzuki,Tomoaki Ohtsuki +1 more
TL;DR: This paper proposes a selective superimposed pilot channel estimation scheme by selecting a pilot sequence that has a low correlation with the data symbol sequence from the set of the pilot sequences assigned to the transmitter, and shows that the proposed scheme can achieve good channel estimation even under fast fading environments.
References
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Digital communications
TL;DR: This month's guest columnist, Steve Bible, N7HPR, is completing a master’s degree in computer science at the Naval Postgraduate School in Monterey, California, and his research area closely follows his interest in amateur radio.
Book
Mobile Communications Engineering
TL;DR: In this article, the authors describe the characteristics of mobile radio signals and apply statistical communication theory to propagation and received signal characteristics, and provide a discussion of system performance and how to evaluate a new system.
Journal ArticleDOI
TCMP-a modulation and coding strategy for Rician fading channels
M.L. Moher,J.H. Lodge +1 more
TL;DR: TCMP is a novel modulation strategy for Rician fading channels that multiplexes a time domain pilot sequence with trellis-coded data to permit coherent detection and is shown to provide remarkably robust performance in the presence of fading.
Proceedings ArticleDOI
Rayleigh fading compensation method for 16QAM in digital land mobile radio channels
S. Sampei,T. Sunaga +1 more
TL;DR: In this paper, a Rayleigh fading compensation method for 16-QAM was proposed, where second-order interpolation was used for the fading compensation, and the degradation due to the proposed fading compensation was about 2 dB.