Code Division Multiple Access (CDMA) is probably the most interesting multiple access method provided by spread spectrum technology. CDMA refers to a multiple access method in which the individual terminals use spreadspectrum techniques and occupy the entire spectrum whenever they transmit. This paper focuses on direct-sequence spread-spectrum principles (processing gain, spreading, de-spreadin...

The investigation of spectrum overlay of a Spread Spectrum system on the existing narrowband FM broadcasting system1 is presented. The overlaid Spread Spectrum (SS) system is assumed to utilize direct sequence (DS) spreading, using maximal length pseudorandom sequences. We studied the performance degradation of the analog FM system due to the interference produced by the SS signal, through labo...

In this paper, sampling rate selection diversity (SRSD) scheme for Direct-Sequence/Spread-Spectrum (DS/SS) is proposed. In DS/SS communication systems, oversampling may be employed to increase the signal-to-noise ratio (SNR). However, oversampling enlarges the power consumption because signal processing of the receiver has to be carried out at a higher clock rate. Higher sampling rate does not ...

Frequency-domain equalization (FDE) based on minimum mean square error (MMSE) criterion can replace rake combining with much improved bit error rate (BER) performance of the multi-code direct sequence spread spectrum (DSSS) signal transmission in a severe frequency-selective fading channel. However, since the channel cannot be completely equalized, the residual inter-code interference (ICI) is ...

The linear frequency modulation (LFM) interference is one of the typical broadband interferences in direct sequence spread spectrum (DSSS) communication system. In this article, a novel parameter estimation method LFM proposed for DSSS system alpha-stable noise. To accurately estimate parameters, noise should be eliminated first. Thus, we formulate new generalized extended chirplet transform to...