A Brief Review on CDMA Systems for Ad-hoc Network

In this paper, we have presented a brief review on the use of Spread Spectrum technique in the field of Ad-hoc networking. Various studies have revealed that Spread Spectrum technique is appropriate for ad-hoc networking because of its tremendous advantages such as security, interference robustness, capacity enhancement etc. Direct Sequence Spread Spectrum CDMA is a type of spread-spectrum communication system in which multiple signal channels share the same frequency band. They are distinguished by the use of different spreading codes known as Pseudo random codes. The Direct Sequence CDMA is one of the most promising medium access technology which is expected to play a vital role in the upcoming communication systems due to its robustness and higher capacities. A brief review of different systems employing different methodologies has been discussed in this paper. A DS-CDMA transmitter and receiver with BPSK modulator and demodulator has been implemented in previous works. On the other hand some of them makes use of Frequency Hopping as the Spreading technique. Others employ the use of Gold codes and others as the spreading sequence. The use of these techniques and their disadvantages has been discussed briefly.