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In CDMA systems, turbo multi user detection for multiple access interference cancellation and channel decoding in CDMA systems has an exponentially growing complexity with number of users. In these systems, when bandwidth efficient modulations like M-ary PSK are used another exponential factor that is relates to the levels of modulation prohibitively increases the computational complexity of the receiver...
An important problem for multicarrier systems is frequency offset between a transmitter and receiver, which can substantially deteriorate system performance. In this paper, we propose a frequency-domain fractionally-spaced minimum mean square error (FDFS-MMSE) multiuser detector for multicarrier code-division multiple-access (MC-CDMA) systems. Numerical results show that with frequency-domain oversampling...
In multiple-input multiple-output (MIMO) multiuser detection theory, the QR decomposition of the channel matrix H can be used to form the back-cancellation detector. In this paper, we propose an optimal QR decomposition, which we call the equal-diagonal QR decomposition, or briefly the QRS decomposition. We apply the decomposition to precoded successive-cancellation detection, where we assume that...
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