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In this book, we describe CDMA Technologies and its problem and implemented a DS SS CDMA-based medium access protocol with transmitter & receiver for ad- hoc networks using VHDL language. In telecommunications, direct-sequence spread spectrum (DSSS) is a modulation technique like other spread spectrum technologies; transmitted signal takes up additional bandwidth than the data signal which modulates the carrier frequency. DS-CDMA is beneficial for Ad hoc network because it eliminates the requirement for any frequency or time-slot coordination. The main issue in DS-CDMA (Ad hoc network) is the hindrance of a near-far problem. There are two solutions available for reducing this near far effect, first is Power control and second is Medium access problem. In this book, we focus on medium access problem, for this, we design multiple access interference (MAI) at the protocol level. in this book we describe "VHDL implementation" for MAC Based DSSS CDMA design, which consist transmitter & receiver with MAC protocol of a Ad-hoc network & describe Its Advantages.

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Bramha S. Tripathi is working as a Senior Project Associate in the Depart. of CSE in IGDTUW University Delhi. He received the Mtech in VLSI Design & B.E. in Electronics from RGPV University MP and has 6 year experience in Research&Teaching as an Assistant Professor. His current research interests are in Sensor Networks, wireless comm & 3D Modeling.

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