Performance analysis of two-user cooperative ARQ protocol over Rayleigh fading channel

EURASIP Journal on Wireless Communications and Networking, Jan 2015

In this paper, we present a two-user cooperative automatic repeat request (C-ARQ) protocol which combines cooperative diversity at the physical layer and ARQ at the link layer. In this scheme, distributed Alamouti space-time block coding (DASTBC) is applied to achieve cooperative diversity, and ARQ is used to improve the data link layer reliability. To analyze the performance of the proposed protocol, we derive the average frame error rate (FER) and throughput with multiple phase shift keying (MPSK) over a Rayleigh fading channel. Numerical simulation results show that the performance gain of average FER with ARQ retransmission is about 2 dB more than the case without ARQ retransmission in the same conditions. Moreover, the combined DASTBC and quadrature phase shift keying (QPSK) with ARQ retransmission will lead to an approximate 3 Mbits/s increase in transmission rate.

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Performance analysis of two-user cooperative ARQ protocol over Rayleigh fading channel

Hailin Xiao 0 Ju Ni 1 0 School of Information and Communication, Guilin University of Electronic Technology , Guilin 541004, Guangxi , China 1 Library of Guilin University of Electronic Technology , Guilin 541004, Guangxi , China In this paper, we present a two-user cooperative automatic repeat request (C-ARQ) protocol which combines cooperative diversity at the physical layer and ARQ at the link layer. In this scheme, distributed Alamouti space-time block coding (DASTBC) is applied to achieve cooperative diversity, and ARQ is used to improve the data link layer reliability. To analyze the performance of the proposed protocol, we derive the average frame error rate (FER) and throughput with multiple phase shift keying (MPSK) over a Rayleigh fading channel. Numerical simulation results show that the performance gain of average FER with ARQ retransmission is about 2 dB more than the case without ARQ retransmission in the same conditions. Moreover, the combined DASTBC and quadrature phase shift keying (QPSK) with ARQ retransmission will lead to an approximate 3 Mbits/s increase in transmission rate. 1 Introduction Multiple antennas are often used to combat channel fading in wireless communication system [1]. However, implementing multiple antennas at a mobile station is impractical for most wireless applications due to the limited size of the mobile unit [2,3]. Relay-assisted communication is suitable to solve the problem and plays a main role in the future generation cellular systems and ad hoc networks [4]. One form of relayassisted communication is cooperative diversity [5,6]. Its principle is to exploit the broadcast nature of wireless transmission and creates a virtual antenna array through cooperating users. Each transmitting node has its own message and is responsible for transmitting the information of its partner(s). Therefore, a virtual antenna array is obtained through the use of the relay's antennas without complicated signal design or adding more antennas into the nodes. In [7], a cooperative diversity scheme between users has been used not only to obtain higher throughput but also to decrease timevarying channel sensitivity. In [8], multiple-source cooperative message has been sent to a common destination, and it is shown to offer full spatial diversity with better bandwidth efficiency. In [9], differential relay strategies over downlink channel in a two-user cooperative communication system have been proposed, which are able to achieve performance gain in association with the proposed criterion. Recently, various techniques such as distributed space-time coding [10,11] and modulation [12] have been developed to realize cooperative diversity. For achieving a diversity gain, the Alamouti space-time block code (STBC) has been used in cooperative system in a distributed manner [13]. These cooperative diversity schemes have been shown to be able to achieve significant performance gains over the amplifyand-forward and decode-and-forward protocols [14]. Automatic repeat request (ARQ) protocol is commonly used in the communication system to improve the reliability, which requests retransmissions for those packets received in error [15]. Recently, the ARQ protocol has been applied in cooperative diversity system to achieve higher link reliability; it is called cooperative ARQ [16]. Cooperative ARQ (C-ARQ) protocol permits nodes other than the source and the destination to actively help deliver the correct data [3,17,18]. In [3], the authors have analyzed the diversity multiplexing trade-off (DMT) for ARQ-based opportunistic cooperative communication over Nakagami fading channels. In [17], the authors have designed the ARQ protocol for two-user cooperative diversity systems in wireless networks. In [18], a cross-layer Figure 1 Two-user cooperative diversity system. C-ARQ has been studied, and the performance of spectral efficiency over Nakagami fading channel has been evaluated. In [19], a coordinated hybrid automatic repeat request (HARQ) approach has been proposed, which can improve the network outage probability and the users' fairness. Despite that these studies are not relevant to the average frame error rate (FER) and throughput of cooperative ARQ, they can serve as references [20]. In this paper, we present a two-user C-ARQ protocol which combines cooperative diversity at the physical layer and ARQ at the link layer. To analyze the performance of the protocol, we derive the average FER and throughput Figure 2 Two-user cooperative ARQ protocol based on [15]. with multiple phase shift keying (MPSK) over a Rayleigh fading channel. Numerical simulation results show that the performance gain of average FER with ARQ retransmission is about 2 dB more than the case without ARQ retransmission in the same conditions. Moreover, the combined distributed Alamouti space-time block coding (DASTBC) and quadrature phase shift keying (QPSK) with ARQ retransmission will lead to an approximately 3 Mbits/s incr (...truncated)


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Hailin Xiao, Ju Ni. Performance analysis of two-user cooperative ARQ protocol over Rayleigh fading channel, EURASIP Journal on Wireless Communications and Networking, 2015, pp. 11, Volume 2015, Issue 1, DOI: 10.1186/s13638-014-0236-7