Signal Processing by Generalized Receiver in DS-CDMA Wireless Communications Systems

The main characteristics of any wireless communication system are deteriorated as a result 12 of the effect of the additive and multiplicative noise. The effect of addition of noise and 13 interference to the signal generates an appearance of false information in the case of the 14 additive noise. For this reason, the parameters of the received signal, which is an additive 15 mixture of the signal, noise, and interference, differ from the parameters of the transmitted 16 signal. Stochastic distortions of parameters in the transmitted signal, attributable to 17 unforeseen changes in instantaneous values of the signal phase and amplitude as a function 18 of time, can be considered as multiplicative noise. Under stimulus of the multiplicative 19 noise, false information is a consequence of changed parameters of transmitted signals, for 20 example, the parameters of transmitted signals are corrupted by the noise and interference. 21 Thus, the impact of the additive noise and interference may be lowered by an increase in the 22 signal-to-noise ratio (SNR). However, in the case of the multiplicative noise and 23 interference, an increase in SNR does not produce any positive effects. 24