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Exact BER performance of asynchronous DS-CDMA systems using quadriphase spreading and QPSK modulation over rayleigh channels
2006
IEEE Wireless Communications and Networking Conference, 2006. WCNC 2006.
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An accurate closed-form expression is derived for calculating the average BER in an asynchronous DS-CDMA system using random complex-valued spreading sequences for transmission over Rayleigh channels. ...
Our numerical simulation results verify its accuracy, and also demonstrate the relative inaccuracy of the Gaussian approximation. ...
In Section II a general asynchronous DS-CDMA system using complex-valued spreading sequences and QPSK modulation for transmission over Rayleigh channels is described. ...
doi:10.1109/wcnc.2006.1683628
dblp:conf/wcnc/LiuH06
fatcat:2pyar7vg4rdjrpa6roc2yj4lcm
Precise BER Formulas for Asynchronous QPSK-Modulated DS-CDMA Systems Using Random Quaternary Spreading Over Rayleigh Channels
2008
IEEE Transactions on Vehicular Technology
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Precise bit-error-ratio (BER) analysis of an asynchronous QPSK-modulated direct-sequence code-division multiple-access system using random quaternary spreading sequences for transmission over Rayleigh ...
Index Terms-Asynchronous direct-sequence code-division multiple-access (DS-CDMA), bit-error-ratio (BER), precise, QPSK, quarternary spreading, Rayleigh. ...
CONCLUSION In this paper, we provided exact BER formulas for the asynchronous QPSK-modulated DS-CDMA system using the random quaternary spreading sequences for transmission over Fig. 2 . ...
doi:10.1109/tvt.2007.905257
fatcat:237rbwfpyff65hiiqdffekpd5m
DS-CDMA system with joint channel estimation and MAP detection in time-selective fading channels
2001
IEEE Journal on Selected Areas in Communications
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In this paper, maximum a posteriori (MAP) detection is applied to a direct-sequence code-division multiple-access (DS-CDMA) system jointly with identification and estimation of time-selective fading channels ...
Also, differential modulation is applied to eliminate the need for pilot insertion. Through computer simulations, near-optimum bit error rates (BERs) are found. ...
However, because of asynchronism in DS-CDMA systems, signals from different users cannot be kept orthogonal and multiple-access interference (MAI) arises. ...
doi:10.1109/49.909614
fatcat:2mf3i7kkf5f2lbgyuwznrwkvqa