Wireless communication is one of the most popular areas in the communication field today. Development of next generation wireless networks depends on suitable wireless and access schemes. This scheme needs to provide high data rates needed to maintain a certain level of robustness against errors. There are numerous challenges to implement these systems. These problems include propagation effects in particular multipath propagation, capacity limits due to spectral availability and the need for asynchronous access. Spread spectrum system is a class of wireless digital communication systems specially designed to overcome jamming situation. One possible method to moderate the aforementioned problems is the use of spread spectrum communication.This paper investigates the performance of different phase modulation techniques which are used for Direct Sequence Spread Spectrum (DSSS) systems in idealistic AWGN (Additive White Gaussian noise) channel. It has been observed that Direct Sequence Spread Spectrum - Binary Phase Shift Keying (DSSS-BPSK) spread spectrum system achieves a better error performance in terms BER as compared to other techniques.