Noncoherent multi-way relay based on fast frequency-hopping M-ary frequency-shift keying

Cao, Jiang; Yang, Lie‐Liang; Zhang, Zhong

doi:10.1109/iswcs.2010.5624293

Cited by 5 publications

(23 citation statements)

References 14 publications

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“…In multi-way relay scenario, several users try to exchange their information with each other with the help of relays, where direct links between the source nodes whether exist or are not considered either due to large scale path loss or shadowing effects. Similar to two-way relaying, self interference can be removed by exploring the priori information at the source nodes [6]- [9]. Various relaying protocols, such as amplifyand-forward (AF), decode-and-forward (DF) or compress-andforward (CF), were considered and the achievable symmetric rate of all users were studied in [5].…”

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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“…Additionally, there are some wireless networks, such as the wireless ad-hoc networks for video conference or multi-player gaming, which are designed motivating to share information among a group of distributed terminals. In these types of wireless systems where a group of terminals are required to share part or full of their information, one of the efficient communication strategies may be the multiway communication, which has drawn an increasing attention recently [2][3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

“…Recently, multi-way communication has been suggested to be implemented with the aid of relays, forming the multiway relay communication [2][3][4][5][6]. Specifically, in [2], the symmetric rate achievable by all users involved has been studied, when amplify-and-forward (AF), decode-and-forward (DF) or compress-and-forward (CF) relaying protocol is invoked.…”

Section: Introductionmentioning

confidence: 99%

“…The capacity of the binary multiway relay channel has been studied in [5], where multiple terminals exchange their information with the aid of a relay supported by a so-called functional-decode-forward coding strategy. Furthermore, in [6], non-coherent fast frequencyhopping (FFH) technique has been proposed for information exchange among a group of MTs through a relay, which recovers and forwards a time-frequency matrix. The information exchange in [6] is achieved using two time-slots regardless of the number of MTs involved.…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, in [6], non-coherent fast frequencyhopping (FFH) technique has been proposed for information exchange among a group of MTs through a relay, which recovers and forwards a time-frequency matrix. The information exchange in [6] is achieved using two time-slots regardless of the number of MTs involved.…”

Section: Introductionmentioning

confidence: 99%

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

Shi

Yang

2011

2011 IEEE 73rd Vehicular Technology Conference (VTC Spring)

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Abstract-A multiway relay direct-sequence code-division multiple-access (MR-DS-CDMA) system is proposed for exchanging information among a group of distributed mobile terminals (MTs). In order to implement information exchange, a MT having similar distances from the other MTs is chosen to act as a relay, which assists the whole group of MTs to achieve their information exchange within two time-slots. In our proposed MR-DS-CDMA system, the relay is operated in detection-and-forward (DF) relaying strategy. Signals at the relay and the MTs are detected in the principles of minimum mean-square error multiuser detection (MMSE-MUD) or of the receiver multiuser diversity assisted multi-stage MMSE MUD (RMD/MS-MMSE MUD). The error performance of the MR-DS-CDMA is investigated, when communicating over Nakagami-m fading channels. Our studies show that the MR-DS-CDMA employing the RMD/MS-MMSE MUD at both the relay and MTs constitutes a high-efficiency information exchange system. It has low delay, promising error performance and low-complexity. Furthermore, it is robust to system overloading, where the number of MTs supported is higher than the spreading factor of the DS-CDMA system.

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Iterative interference cancellation in multiuser relaying with fast frequency‐hopping modulation

Nguyen¹,

Le‐Ngoc²

2014

IET Communications

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A novel iterative receiver is proposed for relay-assisted multiuser communications in which multiple users transmit to a destination with the help of a relay and using fast frequency-hopping modulation. Each user employs a channel encoder to protect its information and facilitate interference cancellation at the receiver. The signal received at the relay is either amplified, or partially decoded with a simple energy detector, before being forwarded to the destination. The proposed iterative receiver exploits the soft outputs of a channel decoder to successively extract the maximum-likelihood symbols of the users and perform interference cancellation. Under the same spectral efficiency, simulation results demonstrate superior performance of the proposed receiver when compared to the performance of an interference cancellation scheme that was previously proposed for multiuser communications and is extended to multiuser amplify-and-forward relaying considered in this study, as well as performance of the maximum-likelihood multiuser detection for uncoded transmission.

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Noncoherent multi-way relay based on fast frequency-hopping M-ary frequency-shift keying

Cited by 5 publications

References 14 publications

Performance Analysis for Multi-Way Relaying in Rician Fading Channels

Performance Analysis for Multi-Way Relaying in Rician Fading Channels

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

Iterative interference cancellation in multiuser relaying with fast frequency‐hopping modulation

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