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REVIEW ON DS SS-CDMA TRANSMITTER AND RECEIVER FOR AD HOC NETWORK USING VHDL IMPLEMENTATION

Keywords: VHDL , MAC protocol , DBPSK modulator & demodulator , DDFS , Direct Sequence Spread Spectrum.

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Abstract:

In telecommunications, direct-sequence spread spectrum (DSSS) is a modulation technique. As with other spread spectrum technologies, the transmitted signal takes up more bandwidth than the information signal that modulates the carrier or broadcast frequency. DS-CDMA is advantageous for ad hoc networks because it eliminates the need for any frequency or time-slot coordination, directly benefits from inactive terminals in the network. Ad-hoc network is a decentralized type of wireless network. The network is ad hoc because it does not rely on a pre-existing infrastructure, such as routers in wired networks or access points in managed wireless network. This paper investigates the benefit of Medium access Protocol based on direct-sequence code-division multiple-access (DS/CDMA) Ad-hoc network. This article give a review of MAC protocol that have been proposed for Direct sequence spread spectrum code Division Multiple Access(DS-SS CDMA) for ad-hoc network using VHDL implementation. We first describe the problem of DS CDMA used for ad-hoc network, and then describe the How to remove problem of DS CDMA using our proposed protocol.The main issue in DS-CDMA ad hoc networks is the prevention of a near-far problem in packet communication and low throughput, collision & cross correlation. We know that the two solutions to reduce the near far effect are power control and medium access. So we are focusing the medium access problem and we are designing multiple access interference (MAI) at the protocol level using VHDL implementation. Our Goal is to Using VHDL Implementation for design a DS SS CDMA-based Transmitter with MAC protocol & receiver for ad-hoc network that increases the throughput and avoided the collision & cross correlation, and improve overall performance in ad- hoc network.

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