Relay selection in mixed RF/FSO system over generalized channel fading

Sharma, Nikhil; Bansal, Ankit; Garg, Parul

doi:10.1002/ett.3010

Cited by 31 publications

(21 citation statements)

References 25 publications

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“…Further improvement in the system performance can be observed by using the multiple relay system due to the spatial diversity; however, the multiple relayed system suffers from limitation of power distribution, i.e., either we need more transmitting power or it is equally divided into all the relays, and also it requires strict synchronization at the receiver. Thus to overcome these limitations, we go for relay selection [14][15][16]. In relay selection, based on a performance metric the single best relay is selected for data transmission.…”

Section: Introductionmentioning

confidence: 99%

Relay selection in mixed RF/FSO system using DF relaying

2016

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In this paper, we carry out the performance analysis of relay selection in decode-and-forward (DF)-based mixed radio frequency/free-space optical (RF/FSO) system. We consider two relay selection schemes, namely maxselect and distributed switch and stay, and compare their performance with the system having all relays active. The selected DF relay decodes the received RF signal from source and converts it into an optical signal using the subcarrier intensity modulation scheme for transmission over FSO links. The RF links follow generalized η − μ distribution, while the FSO links are subjected to pointing errors and are assumed to follow gamma-gamma distribution. Novel analytical expressions for cumulative density function and the moment generating function of the equivalent end-to-end signal-to-noise ratio are derived. Capitalizing on the derived statistics, we provide the new closed-form expressions of the outage probability for different relay selection schemes.

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Section: Introductionmentioning

confidence: 99%

Relay selection in mixed RF/FSO system using DF relaying

2016

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“…Selection relaying is a useful alternative to mitigate the adverse effects of error propagation . In threshold‐based selection relaying, relays assist in the transmission of information if their source‐relay channel signal‐to‐noise ratio (SNR) become larger than a threshold and otherwise remain silent .…”

Section: Introductionmentioning

confidence: 99%

On the performance of space‐time coding and threshold‐based selection relaying in cooperative networks with multiple antenna relays

Gilan

Olfat

2018

Trans Emerging Tel Tech

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In this paper, a threshold‐based selection relaying scheme that employs space‐time coding (STC) strategy is considered in a decode and forward (DF) cooperative network with multiple‐input–multiple‐output relays. One of the serious imperfections affecting these systems is error propagation on the source‐relay link, which culminates in intersymbol interference (ISI). Two scenarios are studied. In the first scenario, a new beamforming method is proposed for removing ISI between symbols of distributed space‐time coding scheme caused by erroneous detection of symbols at relays. It is demonstrated that this system is more power efficient in comparison to other systems without beamforming. In the second scenario, a new central STC that we nominate its orthogonal‐STC generator is proposed for multiple‐input–multiple‐output relays. The proposed new transmission scheme, in this case, removes ISI between symbols, which significantly mitigates the adverse effects of error propagation in DF relay networks. A closed‐form expression for end‐to‐end bit error rate of the system is derived for both scenarios. The asymptotic behavior analysis of the system shows that the threshold‐based selection relaying scheme in the second scenario, which uses a simple maximal ratio combining, by employing proper thresholds derived in the paper, achieves full diversity order 2M + 1 in the DF relay network with M relays. Numerical results show an excellent agreement between analytical and simulation results. There is 4 dB power saving at bit error rate of 10−4 for the second scenario compared with the first one and it outperforms other existing works.

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“…Selection relaying is an effective alternative to curb the adverse effects of error propagation . In threshold‐based selection relaying, the relays cooperate for information transmission if their source‐relay channel signal‐to‐noise ratio (SNR) becomes larger than a threshold and otherwise remain silent .…”

Section: Introductionmentioning

confidence: 99%

New beamforming and distributed space‐time coding with selection relaying over Nakagami‐m fading channels

Gilan

Olfat

2018

Trans Emerging Tel Tech

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In this paper, a decode‐and‐forward (DF) cooperative network under Nakagami‐m fading is considered. A threshold‐based selection relaying scheme is used to choose the relays for cooperation and the selected relays then employ distributed space‐time coding (DSTC) to retransmit their detected symbols to destination. When employing DSTC, due to decoding errors at DF relays, intersymbol interference (ISI) would be inevitable in these networks. A new beamforming (BF) method, named as bisector alignment, is proposed for mitigating ISI between symbols of DSTC scheme caused by erroneous detection of symbols at relay. It is demonstrated that this scheme by using a simple maximal ratio combining is more power efficient compared with other existing methods. A closed‐form expression for end‐to‐end bit error rate (BER) of the system is derived and the asymptotic behavior analysis of the system illustrates that the threshold‐based selection relaying scheme by employing proper thresholds derived in this paper achieves full diversity order (M + 1)m in a network with M relays and Nakagami shape parameter m. Moreover, we can observe an excellent agreement between analytical and simulation results and the proposed BF achieves more than 3‐dB power gain at BER of 10−3. Based on our results, it can be seen that our proposed scheme is robust to imperfect channel estimation and quantizations.

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Relay selection in mixed RF/FSO system over generalized channel fading

Cited by 31 publications

References 25 publications

Relay selection in mixed RF/FSO system using DF relaying

Relay selection in mixed RF/FSO system using DF relaying

On the performance of space‐time coding and threshold‐based selection relaying in cooperative networks with multiple antenna relays

New beamforming and distributed space‐time coding with selection relaying over Nakagami‐m fading channels

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