The paper studies the bit-error-rate (BER) performance of a pilot-symbol-aided (PSA) 16QAM system with an N-branch postdetection selection combining diversity reception over multipath fading channels. Both pilot symbols and data symbols are used to compensate for the fading distortion. Computer simulation results have shown that the use of diversity reception can significantly improve the BER p...

Abstract In next generation mobile communication, high speed and high quality data transmission is required. However, in a DS-CDMA system, when small spreading factor SF is used to achieve high speed data transmissions in a frequency-selective fading channel, an error floor is produced due to large inter-path interference (IPI). The authors have proposed a decision feedback chip-level maximum l...

Abstrac.t-An experimental study of underwater communications systems with a large ensemble of pseud-onoi_s_e_signals js described. Experiments were.performed in shadow antl "onuergence zones (at distancejof 40, 90' 525, and 694 km) in deep-water ocean regions and in a shallow sea (at a disiance of r72 i.rni, Transmission was accompanied by multipath propagation, fading, and scattering of signal...

This paper proposes a method of improving reception of digital satellite broadcasting in a moving vehicle. According to some studies, the antennas used for mobile reception will be smaller in the next generation and reception will be more difficult because of a fading multipath channel with delays in a low carrier-to-noise ratio. Commonly used approaches to reduce the inter symbol interference ...

Error rate performance of coherent square M – ary quadrature amplitude modulation (CSMQAM) over fading channels under diversity reception is obtained and analyzed. The diversity combining technique considered is maximal ratio combining (MRC). The fading channels are modeled as frequency nonselective slow Nakagami – m fading channels corrupted by additive white Gaussian noise (AWGN). The exact a...

This paper derives new closed-form formulas for error probabilities of single and multichannel communications in Rayleigh and Nakagami-m fading. Closed-form solutions to three generic trigonometric integrals are presented as part of the main result, providing a unified method for the derivation of exact closed-form average symbol-error probability expressions for binary and M -ary signals with ...

|A spatial diversity reception assisted multiuser CDMA detector based on genetic algorithms (GAs) is proposed. Two di erent diversity selection strategies are considered. In our rst approach the so-called individuals of the GA are chosen for selection based purely on the sum of their corresponding gures of merit associated with the individual antennas, an approach which is analogous to employin...

Frequency-domain equalization (FDE) based on minimum mean square error (MMSE) criterion is a powerful equalization technique for the broadband single-carrier (SC) transmission. However, the presence of timing offset produces the inter-symbol interference (ISI) and degrades the bit error rate (BER) performance. As the roll-off factor of the transmit filter increases, the performance degrades mor...

The Weibull distribution is a flexible statistical model for describing multipath fading channels in both indoor and outdoor radio propagation environments. A new closed-form expression is derived for the moment generating function of the Weibull distribution, valid when its fading parameter assumes integer values. The performance of digital linear modulations operating on Weibull channels is s...