Performance of spectrum sharing systems with two-way relaying and multiuser diversity

Abstract

In this paper, we consider a spectrum sharing network with two-way relaying and multiuser diversity. More specifically, one secondary transmitter with the best channel quality is selected and splits its partial power to relay its received signals to the primary users by using the amplify-and-forward relaying protocol. We derive a tight approximation for the resulting outage probability. Based on this formula, the performance of the spectral sharing region and the cell coverage are analyzed. Numerical results are given to verify our analysis and are discussed to illustrate the advantages of our newly proposed scheme.

Cooperative spectrum sharing in two‐way multi‐user multi‐relay networks

“…From 7, one can observe that the PUs' signals (contained in x r ) cause severe interference and may lead to significant degradation in receive SNR at S e . Therefore, the PUs' signals need to be decoded at the S e [21,24] to remove the primary interference. The resultant secondary signal at S e (after removal of primary interference) can be given bỹ…”

“…Note that the TWR in the underlay model may not be so appealing as it suffers from more stringent interference constraints owing to the increased number of transmissions. On the other hand, authors in [21][22][23][24][25] have considered overlay spectrum sharing models which are of great significance. In these system models, one or more SUs act as the relays to assist the bidirectional primary transmissions, and share the spectrum based on satisfying the primary system outage probability requirements.…”

“…Further, this system model was investigated with ANC [22] and adaptive [23] based TWR protocols. Very few works have considered such system with multiple SUs and investigated the overall outage performance by employing an opportunistic SU selection based on ANC [24] and TDBC [25]. However, all the aforementioned works are limited to the case of a single PU system and have assumed a Rayleigh fading scenario.…”

Improved Spectrum-Sharing Protocol for Cognitive Radio Networks With Multiuser Cooperation

“…Outage probabilities of the PU and SU in a DF protocol were first investigated in [11]. The analysis was extended to multiple SUs [12] and to an AF protocol [13]. Adaptive AF/DF relaying was investigated in [14] to reduce the outage probabilities of AF and DF systems.…”

Soft information relaying with transceiver hardware impairments in cognitive networks

“…In order to protect quality-of-service of primary transmission, the transmit power of secondary users (SUs) should be limited to the maximum interference allowance of primary users (PUs). To tackle this limitation, the idea of two-way cognitive relay (TWCR) networks has been investigated in [8], [9] among others. The cognitive relay networks exploit the advantages of relaying protocols and cognitive radios and are able to overcome the transmit power limits to further boost the system performance.…”