Power Allocation and Cooperative Diversity in Two-Way Non-Regenerative Cognitive Radio Networks

In this paper, we investigate the performance of a dual-hop block fading cognitive radio network with underlay spectrum sharing over independent but not necessarily identically distributed (i.n.i.d.) Nakagami-$m$ fading channels. The primary network consists of a source and a destination. Depending on whether the secondary network which consists of two source nodes have a single relay for cooperation or multiple relays thereby employs opportunistic relay selection for cooperation and whether the two source nodes suffer from the primary users' (PU) interference, two cases are considered in this paper, which are referred to as Scenario (a) and Scenario (b), respectively. For the considered underlay spectrum sharing, the transmit power constraint of the proposed system is adjusted by interference limit on the primary network and the interference imposed by primary user (PU). The developed new analysis obtains new analytical results for the outage capacity (OC) and average symbol error probability (ASEP). In particular, for Scenario (a), tight lower bounds on the OC and ASEP of the secondary network are derived in closed-form. In addition, a closed from expression for the end-to-end OC of Scenario (a) is achieved. With regards to Scenario (b), a tight lower bound on the OC of the secondary network is derived in closed-form. All analytical results are corroborated using Monte Carlo simulation method

Performance Analysis of Space Shift Keying Modulation With Imperfect Estimation in the Presence of Co-Channel Interference

International audienceIn this letter, the performance of space shift keying (SSK) modulation for multiple-input multiple-output (MIMO) systems with imperfect channel knowledge and in the presence of co-channel interference (CCI) and Rayleigh fading is investigated. In particular, closed-form expressions of the average bit error probability (ABEP) for an arbitrary number of transmit antennas are obtained. To gain further insight on the system performance, simple asymptotic expressions of the ABEP for high Signal-to-Noise Ratio (SNR) are computed, which provide information on the achievable diversity order and coding gain. Numerical results are shown to substantiate mathematical frameworks and findings

Space Shift Keying MIMO System Under Spectrum Sharing Environments in Rayleigh Fading

International audienceThis letter investigates the error performance for the space shift keying (SSK) system under spectrum sharing environments. The secondary network under consideration is equipped with multiple antennas at the transmitter and receiver. The primary network is composed of L primary users (PUs) equipped with multiple antennas. For the underlay spectrum sharing transmission with SSK modulation, the transmit power condition of our proposed spectrum-sharing system is governed by the interference temperature limit on the primary network and the maximum transmission power at the secondary network. In particular, expressions for exact and asymptotic error probability are derived. Simulation results and intuitive discussions are provided to show the correctness of our derived analytical results