A Hybrid Multichannel Hardware Simulator for Frequency-Selective Mobile Radio Paths

The Rayleigh fast fading simulators encountered in mobile radio have been implemented and evaluated. Two models used here for the fading environment were frequency composition of phase modulated signals and shaping spectrum of noise sources with filter. The spectrum chosen for our purpose is appropriate to an omnidirectional antenna. A s a result of the experiment of various parameters, we have obtained satisfying results which are closely agreed to theoretical values.

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“…The phase of X(t) is probably we get sin u t ( 9 ) random and uniformly distributed from -Tto t T T .…”

Section: Phase Modulated Signalsmentioning

confidence: 99%

Development of channel simulator for mobile radio communications

Kim

Lee²,

Park³

1987

37th IEEE Vehicular Technology Conference

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“…Thus, for this case we approximate eq. (9) as N €~= L PIAL. 1=1 (11) We emphasize that consideration will be given only to binary modulation schemes.…”

Section: Weighted Pcmmentioning

confidence: 99%

Weighting Strategies for Companded PCM Transmitted Over Rayleigh Fading and Gaussian Channels

Sundberg

Wong

Steele

1984

At&T Bell Laboratories Technical Journal

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We present three methods of weighting N-bit wlaw Pulse Code Modulation (PCM) with binary modulation, and evaluate their performances theoretically for transmission over Rayleigh fading and Gaussian channels. The digital modulation methods considered are noncoherent frequency shift keying and coherent phase shift keying. Ideal selection combining and ideal maximal ratio combining diversity techniques are employed when the transmission is over fading channels. Weighting System 1 is the conventional weighted pulse code modulated system, where the bits in every PCM word have the same weighting profile. Weighting System 2 has 2 N unique weighting profiles, while System 3 has an addendum to System 2, where every bit in a particular word is further weighted by a unique multiplicative factor. For Rayleigh fading channels and the encoder operating at an input level that provided maximum signalto-quantization noise-ratio, we obtained gains in overall signal-to-noise ratio (sin) over unweighted Il-Iaw PCM of 3, 4.5, and 6 dB for Systems 1, 2, and 3, respectively. When the systems were used in conjunction with Gaussian channels, the corresponding gains were 10, 12, and 17 dB, for a channel sin of 10 dB. In addition to the theoretical results, we conducted computer simulations using four concatenated speech sentences transmitted via our weighted wlaw PCM systems over mobile radio channels. The simulation performances were in good agreement with our theoretical results, which were based on input signals having an exponential distribution.

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Radio Link Performance Prediction

Salous

2013

Radio Propagation Measurement and Channel Modelling

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A Hybrid Multichannel Hardware Simulator for Frequency-Selective Mobile Radio Paths

Cited by 28 publications

References 12 publications

Development of channel simulator for mobile radio communications

Development of channel simulator for mobile radio communications

Weighting Strategies for Companded PCM Transmitted Over Rayleigh Fading and Gaussian Channels

Radio Link Performance Prediction

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