• prashant chouksey
• Dr.Neelesh Mehra

In the frequency-limited cellular networks, the underlaying Device-to-Device (D2D) communications is an efficient way to enhance the user access probability and network capacity performance. To satisfy the communication requirements for users in different network sizes, a cooperative transmission strategy based on multi-relay D2D communications is proposed. Specifically, to increase the serving users simultaneously and meanwhile maintain the QoS of them, a joint admission control and cooperative nodes selection scheme is proposed, and then the power control and resource allocation scheme is provided correspondingly. Simulation results show that the proposed strategy can enhance the user access probability efficiently in frequency-limited cellular networks. There are several relaying strategies to implement cooperative diversity, and some of the basic strategies are Amplify-and- Forward, Decode-and-Forward and Compress- and Forward. Each of them have their own advantage and they can provide different performance results with different environment. Variation of probability of error can be seen with the change in signal combining strategy.

Cooperative Communication, Diversity, Channel Capacitance.

"Performance Evaluation of some basic cooperative communication protocol for wireless networks", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.8, Issue 5, page no.d342-d345, May-2021, Available :http://www.jetir.org/papers/JETIR2105435.pdf

"Performance Evaluation of some basic cooperative communication protocol for wireless networks", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.8, Issue 5, page no. ppd342-d345, May-2021, Available at : http://www.jetir.org/papers/JETIR2105435.pdf