Understanding Probabilistic Cognitive Relaying Communication with Experimental Implementation and Performance...

Area of Science:

• Wireless Communication
• Cognitive Radio
• Spectrum Management

Background:

• Limited wireless spectrum necessitates efficient utilization strategies.
• Cooperative cognitive relaying allows secondary users (SUs) to relay traffic for primary users (PUs), improving spectrum efficiency.
• Secondary users possess better channel conditions to the primary user destination.

Purpose of the Study:

• To propose a systematic framework for Cooperative Cognitive Relaying using USRP2 for practical cognitive radio applications.
• To analyze the impact of admission and scheduling probabilities on primary user and secondary user performance.

Main Methods:

• Implementation of a Cooperative Cognitive Relaying framework using USRP2 hardware.
• Introduction and experimental variation of two key probabilities: Probability of Admission and Probability of Scheduling.
• Verification of practical experimental results against simulation outcomes.

Main Results:

• The study investigates the effects of varying admission and scheduling probabilities on both primary user (PU) and secondary user (SU) performance.
• Practical experiments demonstrate that increasing the probability of scheduling PU packets at the SU favors SU performance.
• This increase in scheduling probability leads to improved SU throughput and reduced SU delay, at the expense of PU performance.

Conclusions:

• The proposed Cooperative Cognitive Relaying framework provides a viable platform for experimental validation of cognitive radio concepts.
• The Probability of Scheduling significantly impacts the performance trade-offs between primary and secondary users.
• Optimizing the Probability of Scheduling is crucial for balancing spectrum sharing and ensuring fair performance between PUs and SUs.