In this dissertation, CE-CPSK(Constant Envelope Continuous Phase Shift Keying) modulated DS/SS(Direct Sequence Spread Spectrum) transceiver with 908 MHz carrier frequency and 1.5 MHz PN clock rate is proposed. The performance of the proposed transceiver is evaluated in the wireless communication channel environment.

When time-varing envelope signals are fed into a nonlinear amplifier such as class C amplifier, it undergoes nonlinear effects which introduce the spectral spreading or spectral regeneration, resulting to the performance degradation in adjacent channels. To overcome these problems, CE-CPSK modulation method which has the constant envelope and continuous phase characteristics is proposed. To analyze the DS/SS receiver performance with respect to code acquisition and code tracking loop, multipath fading channel is characterized as a two-ray Rayleigh fading channel. For the code acquisition loop whose performance is evaluated in terms of the acquisition time and detection probability, the digital matched filter which has the fast acquisition time is taken into account. To compensate the demerit of analog delay locked loop, digital delay locked loop is employed for code tracking loop.

Simulation and experimental examination has been carried out in AWGN (Additive White Gaussian Noise) and Rayleigh fading channel environment in order to prove validity of the proposed method. The simulation results show that high sampling rate improves the performance of DMF(Digital Matched Filter) acquisition system. And in case of high SNR, the performance of the DMF acquisition system has a little difference between AWGN and Rayleigh fading channel. There is about 60us difference in acquisition time between the measured and the simulated average acquisition time. This difference is not critical in acquisition system performance evaluation, because it corresponds to 1/10 of the one PN period.