Advanced digital communications: systems and signal processing techniques
Advanced digital communications: systems and signal processing techniques
Simulation of communication systems
Simulation of communication systems
Modern Quadrature Amplitude Modulation: Principles and Applications for Fixed and Wireless Channels
Modern Quadrature Amplitude Modulation: Principles and Applications for Fixed and Wireless Channels
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The paper proposes a novel pilot-symbol-aided (PSA) technique for fadingcompensation of digital signals in the mobile environments. In a PSA system,the data sequence at the transmitter is divided into frames of data. Apilot symbol from a known pseudoradom-symbol sequence is insertedperiodically into a frame of data symbol for transmission. In aconventional PSA-receiver, these pilot symbols are extracted from thereceived signal and used to estimate the effects of signal distortionintroduced in the fading channel. The resultant estimates are then used tocorrect the distortion effects in the received data frames. In the paper, anovel estimation technique that uses the data symbols as well as the pilotsymbols is proposed. The technique has the major advantages of simpleimplementation and short storage-delay time. Results are presented in aseries of computer-simulation tests. These assess the effectiveness of theestimation technique on the BER performances of a 16-ary phase-shift keyed(16PSK) and a 16-ary quadrature-amplitude modulated (16QAM) signals in thefrequency-selective and frequency-nonselective Rayleigh fading channels.The channels are corrupted by co-channel interference or additive whiteGaussian noise. Results of differential-detected 16PSK and star-16QAMsignals are also presented for comparison. It has been shown that, the useof PSA technique can significantly improve the bit-error-rate performancesof the systems, relative to those using differential detection.