Computing diversity-multiplexing trade-off of static QMF communication strategy in half-duplex diamond relay channels

Soltanizadeh, Hediyeh; Parvaresh, Farzad; Saberali, S. Mohammad

doi:10.1109/istel.2016.7881843

“…In addition, the DMT of the SQMF strategy in the equivalent half-duplex diamond network [8] and the DMT of the full-duplex network are also depicted to give a more complete perspective on the effects of duplexing on a diamond relay network. We also plot the DMT of the SQMF strategy in the hybrid network where the half-duplex relay schedule t equals 1/2, given in (33), for comparison.…”

Section: Numerical Results and Discussionmentioning

confidence: 99%

“…They introduced a metric called diversity-multiplexing trade-off (DMT) to capture this trade-off at high SNR in fading channels. Ever since, DMT has been widely used to evaluate different wireless cooperative and relay networks [2]- [8]. Furthermore, DMT can be used as a powerful tool to assess the performance of relay networks where the data transmission capacity is unknown.…”

mentioning

confidence: 99%

“…Besides, a genetic algorithm was developed to numerically find the DMT of the SQMF strategy faster than the grid-based search technique. In [8], an efficient algorithm that computes DMT of SQMF strategy efficiently is proposed for the diamond half-duplex relay channel by breaking the cumbersome SQMF optimization problem into a finite number of quasi-concave sub-optimization problems. In [25], a half-duplex multiple-relay multiple-antenna (MRMA) diamond network is studied, in which a single-antenna source sends its information bits to a single-antenna destination through N ≥ 2 multiple-antenna relays where source-relay links have the same average SNR exponents but possibly different from the relay-destination links.…”

mentioning

confidence: 99%

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On the Diversity-Multiplexing Trade-off of Hybrid Diamond Relay Channels

Jorjani¹,

Narimani²,

Tabataba³

et al. 2022

Preprint

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The diversity-multiplexing trade-off (DMT) of a diamond relay channel in a quasi-static slow Rayleigh fading environment is studied, where one of the relays operates in half-duplex mode while the other one is full-duplex; hence, the term hybrid is used to refer to this channel. DMT is a known powerful tool that captures the inherent tension between the reliability and the transmission rate in a wireless communication network at high signal-to-noise ratios (SNR). In this study, we have assumed that the average SNRs of different links vary at different rates, each represented by an exponent at high SNR. These average SNR exponents are categorized into two different classes: In Class I, both of the relays are placed either in close proximity to the source or in close proximity to the destination, whereas in Class II one of the relays is closer to the source while the other one is closer to the destination. Subsequently, for Class I and for a special symmetric case of Class II, an explicit expression of the DMT of the static quantize-map-and-forward (SQMF) strategy and the optimal static schedule in the half-duplex relay, is derived. The non-symmetric case of Class II can numerically be studied using the optimization problem provided in the paper for any given parameters. As a corollary, our analysis shows that for Class I, the SQMF strategy in the proposed hybrid diamond relay channel reaches the ideal full-duplex DMT upper bound if the degrees of freedom provided by the path through the full-duplex relay is greater than or equal to that provided by the path through the half-duplex relay, or if the degrees of freedom provided by the former is less than that provided by the latter, but still large enough to support the desired multiplexing gain.

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“…• The SQMF strategy is similar to DQMF with optimal fixed schedules that depend only on the statistics of channels in the network and not on the instantaneous channel states [19].…”

Section: Introductionmentioning

confidence: 99%

DMT analysis and optimal scheduling for FSO relaying communications

Khayatian

¹

,

Parvaresh

²

,

Abouei

³

et al. 2021

IET Communications

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In this paper, two-hop parallel N -relay networks are considered and the diversitymultiplexing tradeoff (DMT) is derived over Gamma-Gamma free-space optical (FSO) channels with identical average received signal to noise rations in all links. In the derivations, both local and global channel state information (CSI) are investigated. In the local CSI case, the node only knows its incoming link conditions, while in the global CSI case, the nodes are aware of all the CSIs in the network. The listening and transmitting times at the relays as variables in the DMT derivation are further considered which are later used to optimize the performance of the network. It is demonstrated that the optimal DMT is obtained with the static quantize map and forward (SQMF) and dynamic quantize map and forward (DQMF) strategies for different ranges of the multiplexing gain. In addition, the optimal schedule of relays in the DQMF strategy is determined as a function of the local channel conditions in the relays. INTRODUCTIONFree-space optical (FSO) communication provides high channel bandwidth at low cost and inherent security using near-infrared (NIR) carrier frequencies in the optical band [1]. These benefits make FSO systems appealing for various applications in terrestrial and satellite communication links. However, despite their important advantages, the performance of terrestrial FSO systems are affected by atmospheric fading. Parallel relay networks are one of the ways to eliminate this defect in FSO systems [2]. One of the fundamental metrics to characterize the performance of an FSO system is the optimality of the diversitymultiplexing tradeoff (DMT). In [3], the authors introduce the DMT metric in an FSO system for Log-normal, Gamma-Gamma, and negative exponential channel models. Parallel relaying connects the source and the destination through several parallel sets of relays that are assumed to use orthogonal channels for relaying the information simultaneously [4,5]. Also, a direct link might exist based on the propagation conditions. Since the destination node receives the same data via multiple independent different paths, parallel relaying systems can enhance the reliability and/or capacity in FSO systems. This model of cooperative communications was presentedThis is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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On the Diversity-Multiplexing Trade-off of Hybrid Diamond Relay Channels

Jorjani¹,

Narimani²,

Tabataba³

et al. 2022

Preprint

Self Cite

0

View full text Add to dashboard Cite

The diversity-multiplexing trade-off (DMT) of a diamond relay channel in a quasi-static slow Rayleigh fading environment is studied, where one of the relays operates in half-duplex mode while the other one is full-duplex; hence, the term hybrid is used to refer to this channel. DMT is a known powerful tool that captures the inherent tension between the reliability and the transmission rate in a wireless communication network at high signal-to-noise ratios (SNR). In this study, we have assumed that the average SNRs of different links vary at different rates, each represented by an exponent at high SNR. These average SNR exponents are categorized into two different classes: In Class I, both of the relays are placed either in close proximity to the source or in close proximity to the destination, whereas in Class II one of the relays is closer to the source while the other one is closer to the destination. Subsequently, for Class I and for a special symmetric case of Class II, an explicit expression of the DMT of the static quantize-map-and-forward (SQMF) strategy and the optimal static schedule in the half-duplex relay, is derived. The non-symmetric case of Class II can numerically be studied using the optimization problem provided in the paper for any given parameters. As a corollary, our analysis shows that for Class I, the SQMF strategy in the proposed hybrid diamond relay channel reaches the ideal full-duplex DMT upper bound if the degrees of freedom provided by the path through the full-duplex relay is greater than or equal to that provided by the path through the half-duplex relay, or if the degrees of freedom provided by the former is less than that provided by the latter, but still large enough to support the desired multiplexing gain.

show abstract

Computing diversity-multiplexing trade-off of static QMF communication strategy in half-duplex diamond relay channels

Cited by 3 publications

References 11 publications

On the Diversity-Multiplexing Trade-off of Hybrid Diamond Relay Channels

On the Diversity-Multiplexing Trade-off of Hybrid Diamond Relay Channels

DMT analysis and optimal scheduling for FSO relaying communications

On the Diversity-Multiplexing Trade-off of Hybrid Diamond Relay Channels

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