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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Proceedings ArticleDOI
Kalman filter channel tracking algorithm based on AR model in WCDMA systems
TL;DR: This paper investigates how to estimate the channel and implement an equalizer by the Kalman filter in a DS-CDMA system, and applies two methods to obtain the AR coefficients, one is the adaptive LMS algorithm, and the other is Durbin's recursion method.
Proceedings ArticleDOI
On Pilot Grid Design for an OFDM Air Interface
Gunther Auer,I. Cosovic +1 more
TL;DR: The authors show that the maximum capacity for OFDM over time-variant frequency selective channels is maximized by placing pilots with maximum equidistant spacing given by the sampling theorem, if perfect interpolation is assumed and pilots are appropriately boosted.
Patent
Method and apparatus for generating a channel estimate using a non-pilot portion of a signal
TL;DR: In this paper, an apparatus and a method for generating a channel estimate using a non-pilot signal is presented. And a channel estimator is used to calculate the channel estimate based on the nonpilot portion of the transmitted signal.
Journal ArticleDOI
Design of turbo-coded modulation for the AWGN channel with Tikhonov phase error
TL;DR: A Gaussian approximation method is presented that accurately predicts convergence thresholds for PCTCM codes on the AWGN/Tikhonov channel and shows that the selected codes perform within 0.6 dB of constellation constrained capacity and have no detectable error floor down to bit-error rates of 10/sup -6/.
Proceedings ArticleDOI
Pilot Design for OFDM Amplify-and-Forward with Chunk Reordering
M. Herdin,Gunther Auer +1 more
TL;DR: The proposed pilot and channel estimation scheme allows to fully exploit the gains by reordering groups of received subcarriers at the relay station to optimally couple them into the 2n hop channel.
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.