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The conventional amplify-and-forward cooperative system is capable of achieving a superior performance with the aid of Multiple-Symbol Differential Sphere Detection (MSDSD), when compared to conventional differential detection (CDD) for transmission over time-selective channels. However, the conventional broadcast/cooperative twin-phase based relaying protocol encounters a 50% throughput loss imposed...
Aiming at reducing the system complexity, raising communication rate and supporting CDMA based applications, a direct sequence spread spectrum based underwater acoustic communication system is proposed. BPSK/QPSK modulation is used. A RA coding scheme is adopted to reduce the BER. To reduce the phase-acquisition complexity of receiver, a carrier modulation method which lets spread-spectrum code and...
In this paper, we present a novel adaptive interference suppression method by combining with time-domain filters and frequency-domain filters. Demonstrated by simulation results, the method can significantly improve the performance of DSSS receiver serving at the narrow-band interference environment. The improvement of resulting SNR after NBI suppression will further enhance along with the increasing...
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