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A robust pointing error compensated algorithm for code-division multiple access (CDMA) signals is proposed. Theoretically, minimum variance distortionless response (MVDR) beam-former can achieve the maximum power. However, it is very sensitive to pointing error for the large SNR. In order to deal with the desired signal cancellation problem, the differential rooting method is used to estimate the...
The technology of Direct Sequence Code Division Multiple Access (DS-CDMA) has been chosen for mobile communication systems because of numerous advantages. A major advantage is that it can provide a better capacity compared to the other possible technologies of multiple access. In spread spectrum system the signal bandwidth is increased to a value much larger than is needed to transmit the underlying...
In this paper, we propose smart step closed-loop power control (SSPC) algorithm in a direct sequence-code division multiple access (DS-CDMA) receiver in the presence of frequency-selective Rayleigh fading. This receiver consists of three stages. In the first stage, with constrained least mean squared (CLMS) algorithm, the desired users' signal in an arbitrary path is passed and the inter-path interference...
In this work, we derive a blind equalizer that pursues the maximization of an objective function, consisting of the ratio between the square of the mean signal power and the variance of the signal power. The performance of the addressed equalizers is then investigated by focusing on DS/CDMA communication environments in a downlink scenario. In particular, we have evidenced the effectiveness of the...
Conventional blind beamformers in DS-CDMA systems generally suffer from either unreliable convergence rate or signal cancellation in practical signal environment. In this paper, we propose a novel orthogonal projection scheme to extract spatial interference structure for the blind beamformer, which requires neither the direction of the desired signal nor the array geometry information. Exploiting...
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