Outage probability of cooperative relay networks in Nakagami-m fading channels

Abstract

Abstract-It is well known that the cooperation among nodes can improve the performance of a wireless network. In this letter we analyze the outage probability behaviour of a relay network in Nakagami-m fading channels. A closed-form solution for the outage probability is derived. When m = 1, the results are applicable for Rayleigh fading. Computer simulations confirm the presented mathematical analysis.Index Terms-Cooperative diversity, multihop transmission, outage probability, Nakagami-m channels.

Exact Outage Probability of Cooperative Diversity with Opportunistic Spectrum Access

“…With selection cooperation [13], [14] only a single relay node (the relay with the best instantaneous relay-destination channel) in the decoding set, R(s), is used to forward information to the destination. Furthermore, in contrast to the relay functionality assumed in [8], [11], [12], the cognitive relays can only retransmit information if they are successful in obtaining spectrum during the spectrum sensing period. Therefore, in some cases, even if cognitive relay(s) are able to decode the data from the source successfully they might not be able to assist in relaying due to the unavailability of spectrum.…”

“…and using (10) and (11) we can express P out for perfect spectrum acquisition as (12). Next we consider the outage performance of the cooperative relay system under imperfect spectrum acquisition.…”

“…In [10], several distributed transmit power allocation schemes for relay-based cognitive radio systems utilizing "gray space" spectrum have been developed. Outage probability and average error performance are widely used measures for characterizing the performance of communication systems [11], [12]. In [7], Lee and Yener have studied the approximate outage probability of a repetitionbased 1 cognitive relay network in the high signal-to-noise ratio (SNR) regime.…”

Impact of Channel Estimation Errors in Cooperative Transmission over Nakagami-m Fading Channels

“…There are various protocols to obtain the benefits of user cooperation at a reasonable complexity [1]- [3], including decode-and-forward (DF) protocols and amplifyand-forward (AF) protocols. In DF protocols, the relays decode the received signals and only when no error occurs will the relay participate into the cooperative transmission [4]- [6]. While in AF protocols, the relays simply amplify the received signals and forward them to the destination, where the amplification factors can be fixed or variable [7]- [11].…”

Outage Performance of Decode-and-Forward Relay Systems Using Imperfect MRC Receiver over Nakagami-m Fading Channels

“…Decode-and-forward (DF) relaying protocol is one of the most popular cooperation schemes and the outage probability for DF relay systems under maximal-ratio-combining (MRC) and selectioncombining (SC) at the receiver has been well evaluated in Nakagami-m fading channels [1]- [4]. Among various diversity combining schemes at the destination, maximal-ratiocombining (MRC) has been known as the optimum in terms of maximum combined sighal-to-noise ratio (SNR).…”