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Code shift keying (CSK) was proposed to increase the transmission efficiency of DSSS systems, and to overcome the spreading gain versus data rate limitation. However, CSK modulation provides no multi-access capability, and degrades the flexibility of a spread spectrum system. In this work, a generalized M-ary DSSS modulation scheme, spreading code phase shift keying (SCPSK), is proposed to improve...
This paper deals with the design of blind adaptive mobile receiver for time-hopping (TH) antipodal pulse amplitude modulation (PAM) Ultra wideband (UWB) impulse radio (IR) system. We first employ constrained optimization technique to design a batch mode blind mobile receiver. To reduce the computational complexity, we propose a blind adaptive receiver that is based on the criterion of maximizing the...
Multi-user interference (MAI) cancellation using hysteretic Hopfield neural network (HHNN) receiver for Direct Sequence Code-Division Multiple Access (DS-CDMA) in multipath fading channels is investigated. We have shown that by applying the phenomenon of "hysteresis" to the HNN detector, we may enhance the performance of this detector in all near-far situations, for different number of multipath...
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