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In this paper a joint transmit scheme employing VBLAST and STBC MIMO profile is considered for a MC DS CDMA system. By combining both the MIMO profile spatial multiplexing and diversity gain can be achieved. At the receiver we employed the generalized MUDs like MAP, combined OSIC and SIC detectors. Also, the performance of a joint MAP/OSIC detector is assayed. To detect the signal, channel matrix...
We consider here the problem of multi-user detection for randomly spread direct-sequence (DS) coded-division multiple access (CDMA) over flat fading channels. The analysis is focused on the case of many users, and large spreading sequences such that their ratio, which is the system load, is kept fixed. Spectral efficiency of practical linear detectors such as match-filter and decorrelator employing...
Multicarrier code-division multiple access (MCCDMA) system with adaptive frequency hopping (AFH) has attracted attention of researchers due to its excellent spectral efficiency. A suboptimal water-filling (WF) channel allocation algorithm was previously proposed for the reverse link of this system. To overcome the limitations of the WF algorithm in the presence of fading-induced near-far problem,...
According to asynchronism of the sampling process and the transmission of the symbols, the original symbol can be estimated by use of the original symbol and the symbols around. The feedback multi-user DS-CDMA model that also had been existed was improved. The DS-CDMA blind source was seperated step by step, used the FastICA algorithm. The algorithm converges after iterates about 15 times. The result...
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