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
Coding for a coherent DS-CDMA system employing an MMSE receiver in a Rayleigh fading channel
J.R. Foerster,L.B. Milstein +1 more
TL;DR: Analysis of a convolutionally coded code-division multiple-access system, which employs a linear, minimum mean-square error (MMSE) receiver for interference suppression, shows that the MMSE receiver with coding can provide a substantial gain over the matched-filter receiver in a rapidly varying, Rayleigh fading channel.
Journal ArticleDOI
An intelligent multimode voice communications system for indoor communications
Lajos Hanzo,Jason Woodard +1 more
TL;DR: A novel high-quality, low-complexity dual-rate 4.7 and 6.5 kbits/s algebraic code excited linear predictive codec is proposed for adaptive multi-mode speech communicators, which can drop their source rate and speech quality under network control in order to invoke a more error resilient modem amongst less favorable channel conditions.
Proceedings ArticleDOI
Learning Assisted Estimation for Time- Varying Channels
Xiaoli Ma,Hao Ye,Ye Li +2 more
TL;DR: Different from the existing channel estimators, these algorithms combine learning techniques with preamble training symbols and pilots, and thus can track channel variations on-line and fit better for the current cellular systems, vehicular communications, and underwater acoustic systems.
Proceedings ArticleDOI
An EM-based estimation of OFDM signals
TL;DR: An EM-based algorithm to efficiently detect transmitted data in an OFDM system as well as estimating the channel impulse response (CIR) is proposed, and the bit error rate (BER) can be significantly reduced by this algorithm.
Journal ArticleDOI
On the ARMA approximation for fading channels described by the Clarke model with applications to Kalman-based receivers
TL;DR: It is shown that the approximation of the actual fading process, usually exploited in the literature, is far from effective, and a novel technique is presented, based on an off-line minimization of the mean square error of the channel estimate, which ensures a considerable gain in terms of bit-error rate for Kalman-based receivers without increasing the receiver complexity.
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.