Spectral Eeciency of Cdma Systems with Linear Interference Suppression
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چکیده
~ dcg Abstract | Spectral eeciency of CDMA systems with linear interference suppression and channel coding is calculated. For interference suppression by decorrelation (zero{ forcing, ZF) an analytical solution is given. For interference suppression according to the minimum mean squared error (MMSE) criterion a numerical approximation is applied. Hereby, it turns out, that the optimum modulation scheme and the optimum code rate are depending on both signal{to{noise ratio and power eeciency of the applied channel code. I. Introduction Code{division multiple{access (CDMA) is a promising technique for future mobile communication systems. Its main advantages are a wideband transmitter signal, which combats the frequency{selective fading of mobile radio channels, and its ability to work without synchronization among the diierent users. Furthermore, the same carrier frequency can be used in every cell. Caused by multiuser interference which appears in CDMA systems with randomly chosen signature waveforms spectral ee
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تاریخ انتشار 1997