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
Channel Estimation Algorithms Comparison for Multiband-OFDM
TL;DR: Results show that the frequency based methods generally perform better than the corresponding time based ones, and the performances of LS and LMMSE methods are quite similar, leading to the use of LS estimator for uncoded MB-OFDM systems.
Proceedings ArticleDOI
Multiresolution MBMS transmissions for MIMO UTRA LTE systems
TL;DR: This paper considers the use of M-QAM hierarchical constellations combined with MIMO (Multiple Input Multiple Output) for the transmission of multicast and broadcast services in UTRA and UTRA systems based on Orthogonal Frequency Division Multiplexing (OFDM).
Journal ArticleDOI
Performance analysis of LMMSE receivers for M-ary QAM in Rayleigh faded CDMA channels
TL;DR: In this work, approximations for the symbol error rate in a wireless code-division multiple-access channel are developed that assume that each user employs spectrally efficient M-ary quadrature amplitude modulation and undergoes independent Rayleigh fading.
Journal ArticleDOI
Effects of Channel Estimation Error in the Presence of CFO on OFDM BER in Frequency-Selective Rayleigh Fading Channels
TL;DR: The effects of channel estimation error on the bit-error-rate (BER) of orthogonal frequency division multiplexing (OFDM) systems in frequency-selective slowly Rayleigh fading channels is studied to characterize the performance degradation resulting from imperfect channel state information (CSI).
Patent
Transmitter and method for transmitting soft pilot symbols in a digital communication system
TL;DR: In this paper, a transmitter, channel coder, and method for coding and transmitting a sequence of symbols in a digital communication system utilizing soft pilot symbols are presented, where the transmitter shares the modulation type and location (time/frequency/code) of the soft pilot symbol with a receiver.
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.