A Cooperative Diversity Using Mac Protocol

To deliver the frames faster by using multi-rate capability, this does not necessarily enhance the communication reliability in interference-rich environment. Cooperative communication at the PHY layer attracts a lot of researchers’ attention because it directly enhances the link reliability. Co-operative communication exploits diversity offered by multiple users, known as multiuser or cooperative diversity. It dramatically improves the bit error rate (BER), resulting in a more reliable transmission and a higher throughput. The important thing is the primary motivation of cooperative diversity in this paper is to improve the link reliability over wireless fading channels. The proposed CD-MAC operates on a single channel and uses a single partner (relay).Meanwhile, the relays do not store a copy of client's data, and it only delivers the data from sender to receiver. For more accurate evaluation, we use BER and frame error rate (FER) statistics derived from the product specification. End-to-end packet delay is evaluated and compared between CD-MAC. CD_MAC is to overcome the link breakage problem due to un-reliable, fluctuating communication environment. In CDMAC, each node proactively selects one partner device for its cooperative communication. Two-node cooperation is advantageous compared to multi-node cooperation.