Abstract
Efficiently use of the limited wireless spectrum can be achieved by cooperative cognitive relaying, where secondary users (SUs), who do not pay for the licensed spectrum and have better channel condition to the primary users (PUs) destination, can help the PU by relaying their traffic. A systematic approach of implementing a Cooperative Cognitive Relaying framework using USRP2 is proposed in this paper, which could be used for practical experiments on cognitive radio applications. Two probabilities are introduced in the experiment in the paper and their effect on the PU and SU performance are studied and analyzed. The two probabilities are: (1) Probability of Admission, which controls the PU data that would be allowed by SU in their PU data queue (which could be relayed by SU later) and (2) Probability of Scheduling, which controls the selection of queue at the SU (PU relay data queue or the SU data queue) and the data of the selected queue would be relayed by SU during an idle time slot. Finally, the practical results from the varying of the introduced probabilities on the performance of PU and SU are verified with the simulation results. A very interesting result is found from the practical experiment where it is seen that increasing probability of scheduling of the PU packets at the SU is always in favor of the SU as opposed to the PU in terms of both throughput and delay.
Highlights
As wireless communication has become the de facto standard for the growing and diverse demands of users worldwide, there is a need to use the spectrum as efficiently as possible to accommodate future innovations
A very interesting result is found from the practical experiment where it is seen that increasing probability of scheduling of the primary users (PUs) packets at the secondary users (SUs) is always in favor of the SU as opposed to the PU in terms of both throughput and delay
Efficiency of the spectrum utilization by different users is improved without disturbing the quality of service (QoS) requirements of the PU, who are the legal users as they are paying for the spectrum [3]
Summary
As wireless communication has become the de facto standard for the growing and diverse demands of users worldwide, there is a need to use the spectrum as efficiently as possible to accommodate future innovations. Cooperative communication in cognitive radio should be beneficial for both SUs, as they can use licensed spectrum without paying for it and for the PUs, as SUs should assist in increasing the PUs’ communication performance. Retransmissions by the PU are reduced as the SU’s assist PU’s to deliver their packets to the destination This provides more idle slots that can be used by SUs for their own use, and this process is termed as cognitive relaying. Cognitive relaying helps in making more time slots available for SU’s to transmit it data after fulfilling the demands of the PUs. In this paper, a detailed description of the practical implementation of a Cooperative Relaying. The practical implementation tries to verify the control in the cooperative cognitive relaying performance using the degrees of freedom provided by the two introduced probabilities.
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