Kefeng Guo

Outage Analysis of Cooperative Communication Network with Hardware Impairments

Abstract The hardware impairments of physical transceivers that create distortions degrade the performance of communication. In this paper, we investigate the impact of hardware impairments on the outage performance of dual-hop amplify-and-forward (AF) cooperative networks with partial relay selection. Specifically, the approximated closed-form and asymptotic expressions for the outage probability of dual-hop AF relaying networks with hardware impairments are derived over Rayleigh fading channel, which provides a fast and efficient means to evaluate the impact of hardware impairments on the system performance. In addition, simulation results and intuitive discussions are provided to show the correctness of the analytical results. The finding of this paper suggests that the outage error floor exists when the hardware impairment exists.

Outage and capacity analysis between opportunistic and partial relay cooperative network with hardware impairments

Hardware impairments of physical transceivers that create distortions degrade the performance of communication. This paper analyzes the performance with different relay selections which include partial relay selection and opportunistic relay selection in amplify-and-forward (AF) cooperative network with hardware impairments. Partial relay selection is that the relay node is selected depending on the instantaneous channel information of source-relay hop. Opportunistic relay selection is that the relay node is selected depending on the whole instantaneous channel information. And, the exact closed-form expression for the outage probability and the approximate expression for the ergodic capacity of AF relaying network with hardware impairments are derived over Rayleigh fading channel, which provides a fast and efficient means to evaluate the impact of hardware impairments on the system performance. In addition, simulation results and intuitive discussions are provided to show the correctness of the analytical results.

Performance Analysis of Two-Way Satellite Terrestrial Relay Networks With Hardware Impairments

In this letter, the effect of hardware impairments on two-way satellite-terrestrial hybrid relay networks is analyzed. The terrestrial relay is considered as a two-way relay, which can transmit signals to both the satellite source and the mobile source simultaneously. Specifically, the closed-form expression, the asymptotic expression at high signal-to-noise rates and the throughput for the considered system are derived. The expressions show that the impairments greatly affect the system performance and system performance will be worse when the impairment level is larger. In addition, numerical results are provided to show the correctness of the analytical results.

Outage analysis and impairments allocation of two-way opportunistic relaying network with hardware impairments

The hardware impairments of physical transceivers that create distortions degrade the performance of communication. In this paper, we investigate the impact of hardware impairments on the outage performance of two-way cooperative networks with opportunistic relay selection. Specifically, the exact closed-form and asymptotic expressions for the outage probability are derived over Rayleigh fading channel, based on which the impact of key system parameters on the outage performance can be easily evaluated. Moreover, the asymptotic results reveal that the outage floor appears when the hardware impairments exist. Whats more, the allocation of the fixed hardware impairments is given, which can direct us how to allocate the hardware impairments. In addition, numerical results are also provided to prove the correctness of the analytical results.

Outage Analysis of Multi-Relay Networks With Hardware Impairments Using SECps Scheduling Scheme in Shadowed-Rician Channel

In this paper, we investigate the effect of hardware impairments on the performance of dual-hop amplify-and-forward (AF)/decode-and-forward (DF) multiple relaying networks using switch-and-examine combining with post-selection (SECps) scheduling scheme in shadowed-Rician (SR) channel. Moreover, we consider a more general network, where the hard impairments are both considered at source, relays, and destination. Specifically, to decrease the high-implementation cost, the SECps scheme is adopted to choose an appropriate relay. To evaluate the performance of the considered system, we derive the novel closed-form expression of the outage probability for the AF and DF protocol, respectively. We also derive the asymptotic outage probability results at high SNRs for the DF protocol, which provides a fast way to evaluate the impact of hardware impairments on the dual-hop relay networks in the SR channel. In addition, simulation results are given to validate the correctness of the analytical results.

Performance Analysis of Two-Way Multi-Antenna Multi-Relay Networks With Hardware Impairments

In this paper, a two-way multi-antenna and multi-relay amplify-and-forward (AF) network with hardware impairments is analyzed. The opportunistic relay selection scheme is used in the relay selection. Maximum ratio transmission and maximum ratio combining were used in transmitted and received slot by the multi-antenna relay, respectively. In this paper, we consider two AF protocols, one is variable gain protocol and the other is fixed gain protocol. Especially, the closed-from expressions for the outage probability of the system and the closed-expressions for the throughput of the system are derived, respectively. The system performance at high signal-to-noise ratio (SNR) is very important in real scenes. In order to analyze the impact of hardware impairments on the system at high SNRs, the asymptotic analysis for the system is also derived. In order to analyze the power efficiency, the closed-form expression for the energy-efficiency performance is derived, and a brief analysis is given, which provides a powerful reference for engineering practice. In addition, simulation results are provided to show the correctness of our analysis. From the results, we know that the system will have better performance when the number of relay is growing larger and the impairments’ level is growing smaller. Moreover, the results reveal that the outage floor and the throughput bound appear when the hardware impairments exist.

On the Performance of Cognitive Satellite-Terrestrial Relay Networks with Channel Estimation Error and Hardware Impairments

This paper investigates the joint impact of channel estimation errors (CEEs) and hardware impairments (HIs) on the performance of a cognitive satellite-terrestrial relay network (CSTRN), where the terrestrial and satellite links are considered following Rayleigh fading and shadowed Rician (SR) fading distributions, respectively. Besides, the terrestrial relay is working in half-duplex decode-and-forward (DF) mode. By employing a general and practical model to account for both the CEEs and HIs at each link, the end-to-end signal-to-noise-plus-distortion-and-error ratio (SNDER) is first obtained for the CSTRN. Then, closed-form expressions for the outage probability (OP) and throughput of the CSTRN are obtained, which allows us to demonstrate the aggregate impact of CEEs and HIs. In order to gain insightful findings, we further elaborate on the asymptotic OP and throughput at the high signal-to-noise-ratio (SNR) condition and quantitatively determine the fundamental performance ceiling. Finally, Monte Carlo (MC) computer simulations are provided to verify the correctness of the analytical results. Besides, with representative numerical analysis’s help, interesting findings are presented.

Performance Analysis of Two-Way Satellite Multi-Terrestrial Relay Networks with Hardware Impairments

In this paper, we investigate the performance of a two-way hybrid satellite multi-terrestrial cooperative network with hardware impairments (HIs). Particularly, opportunistic relay selection scheme is employed in the considered network, which can substantially enhance the spectral efficiency and spatial diversity gain. By considering both the amplify-and-forward (AF) and decode-and-forward (DF) relay protocols, the closed-form expressions of the outage probability (OP) and throughput for the system are derived. Furthermore, in order to observe the effects of HIs level and the number of terrestrial relays on the system performance at high signal-to-noise ratios (SNRs), the asymptotic expressions of the system performance are also derived. Finally, computer results are presented to reveal the correctness of the analytical results.

Secure performance analysis and detection of pilot attack in massive multiple-input multiple-output system

This article studies the physical layer security of massive multiple-input multiple-output system in time-division-duplex mode. Specifically, a single-cell downlink massive multiple-input multiple-output communication system is considered. The resulting achievable secrecy rate is investigated in the presence of passive or active eavesdroppers. The analytical results reveal that the massive multiple-input multiple-output system is naturally immune to passive eavesdroppers, but will be dramatically degraded by active attack. On account of the risk caused by active attack, a simple and effective detection algorithm is proposed. Uplink pilots with random phases are transmitted during the detection operation. By comparing the phase deviation change of the received pilot signals’ cross product, the active eavesdroppers can be detected exactly. The closed-form expressions for probabilities of detection, false alarm, and false rejection are obtained respectively, which can demonstrate the robust performance of the proposed detection scheme. To maximize the secrecy energy efficiency of the system, the optimal power allocation strategy is studied under total power constraints. This optimization problem is efficiently solved by fractional programming. Numerical simulation results are derived to validate the secrecy performance of the massive multiple-input multiple-output system, the active pilot attacker detection performance, and the energy efficiency optimization effect.

Secure performance analysis of satellite communication networks in Shadowed Rician Channel

In this paper, we analyze the secure performance of satellite communication networks in Shadowed Rician Channel. It is very important to analyze the secure performance of the satellite-terrestrial networks. In this paper, both the Alice, Bob and Eve are equipped with single antenna respectively. Specifically, the exact closed-form expressions for the probability of non-zero secrecy capacity, the secrecy outage probability and the average secrecy capacity are derived, which provide fast means to evaluate the system performance. In addition, the channel we assume is shadowed Rician (SR) channel, which is close to the reality. Finally, simulation results are provided to verify the correctness of the analytical results.