Outage Analysis of Spectrum Sharing Over M-Block Fading With Sensing Information

Future wireless technologies, such as, 5G, are expected to support a real-time applications with huge data throughput, e.g., holographic meetings. From a bandwidth perspective, cognitive radio is a promising technology to enhance the system’s throughput via sharing the licensed spectrum. From a delay perspective, it is well known that increasing the number of decoding blocks will improve the system robustness toward error, while increasing the delay. Therefore, optimally allocating the resources to determine the tradeoff of tuning the length of decoding blocks while sharing the spectrum is a critical topic for future wireless systems. In this work, we minimize the targeted outage probability over the block-fading channels while utilizing the spectrum sharing concept. The secondary user’s outage region and the corresponding optimal power are derived, over two-blocks and M-blocks fading channels. We propose two sub-optimal power strategies and derive the associated asymptotic lower and upper bounds on the outage probability with tractable expressions. These bounds allow us to derive the exact diversity order of the secondary user’s outage probability. To further enhance the system’s performance, we also investigate the impact of including the sensing information on the outage problem. The outage problem, while including the sensing impact, is solved via proposing an alternating optimization algorithm. Selected numerical results are presented to characterize the system’s behavior and show the added improvements of several sharing concepts.