Performance of Multiway Relay DS-CDMA Systems over Nakagami-m Fading Channels

Shi, Jia; Yang, Lie‐Liang

doi:10.1109/vetecs.2011.5956570

Cited by 3 publications

(2 citation statements)

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“…In [8], the authors investigated the capacity of binary multi-way relay systems. Considering Nakagami-m fading, the performance of multiway relay direct-sequence code-division multiple-access (MR-DS-CDMA) systems was analyzed in [10]. The capacity region of MWRC with functional-decode-forward (FDF) was studied in [11].…”

Section: Introductionmentioning

confidence: 99%

Performance Analysis for Multi-Way Relaying in Rician Fading Channels

Xue

Sellathurai

Ratnarajah

et al. 2015

IEEE Trans. Commun.

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In this paper, the multi-way relaying scenario is considered with M users who want to exchange their information with each other with the help of N relays (N ≫ M ) among them. There are no direct transmission channels between any two users. Particularly all users transmit their signals to all relays in the first time slot and M − 1 relays are selected later to broadcast their mixture signals during the following M − 1 time slots to all users. Compared to the transmission with the help of single relay, the multi-way relaying scenario reduces the transmit time significantly from 2M to M time slots. Random and semiorthogonal relays selections are applied. Rician fading channels are considered between the users and relays, and analytical expressions for the outage probability and ergodic sum rate for the proposed relaying protocol are developed by first characterizing the statistical property of the effective channel gain based on random relays selection. Also, the approximation of ergodic sum rate at high signal-to-noise ratio (SNR) regime is derived. In addition, the diversity order of the system is investigated for both random and semiorthogonal relay selections. Meanwhile, it is shown that when the relays are randomly separated into L groups of M −1 relays, the group with maximum average channel gain can achieve the diversity order L which will increase when more relays considered in the scheme. Furthermore, when semiorthogonal selection (SS) algorithm is applied to select the relays with semiorthogonal channels, it is shown that the system will guarantee that all the users can decode the others information successfully. Moreover, the maximum of channel gain after semiorthogonal relays selection is investigated by using extreme value theory, and tight lower and upper bounds are derived. Simulation results demonstrate that the derived expressions are accurate.Index Terms-Cooperative communication, extreme value theory, multi-way relaying, semiorthogonal relays selection. 0090-6778 (c)

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Section: Introductionmentioning

confidence: 99%

Performance Analysis for Multi-Way Relaying in Rician Fading Channels

Xue

Sellathurai

Ratnarajah

et al. 2015

IEEE Trans. Commun.

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“…By contrast, the IECU is assumed to communicate only with the relays, it does not receive signals from the source or transmit signals to the destination. Note that the IECU may be viewed as a signal processing unit, which implements multi-way relay [26,27] to aid information exchange among relays. As shown in Figure 1, the relays forward their signals to the IECU based on the principles of DS-CDMA and, then, the IECU broadcasts the processed signal back to the relays.…”

Section: System Modelmentioning

confidence: 99%

Performance comparison of cooperative relay links with different relay processing strategies: Nakagami/Gamma approximation approaches

Shi

Dong

Yang

2014

J Wireless Com Network

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In this article, we investigate and compare the error performance of two-hop communication links (THCLs) with multiple relays, when distributed and cooperative relay processing schemes are respectively employed. Our main objectives include finding some general and relatively simple ways for estimating error performance and demonstrating the trade-off of using cooperative relay processing. One distributed relay processing and two cooperative relay processing schemes are compared. In the two cooperative relay processing schemes, one assumes the ideal relay cooperation, in which relays exchange information without consuming energy, while the other one assumes energy consumption for relay cooperation. In this paper, the error performance of the THCLs employing the considered relay processing schemes is investigated, when the channels from source to relays, the channels for information exchange and that from relays to destination experience various types of fading modeled by the Nakagami-m distributions. In order to derive the formulas for the bit error rate (BER) of the THCLs employing binary phase-shift keying (BPSK) modulation and various relay processing schemes, we introduce the Nakagami and Gamma approximation for finding the distribution functions of various variables encountered. Our studies show that the proposed approximation approaches are highly effective, which are capable of accurately predicting the BER of the THCLs supported by the different relay processing schemes.

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