Performance Evaluation of OFDM Amplify-and-Forward Relay System with Subcarrier Permutation

Kočan, Enis; Pejanović-Djurišić, Milica; Michalopoulos, Diomidis S.; Karagiannidis, George K.

doi:10.1587/transcom.e93.b.1216

Cited by 31 publications

(28 citation statements)

References 14 publications

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“…This is particularly important, as it shows that the BER performance improvement is achieved even in the case when the channel conditions on both hops are very bad. One more significant reason in favor of BTB SCM scheme implementation is in the fact that BTB SCM scheme maximizes the capacity in OFDM based relay systems, [3], [4]. On the other side, analyzing the high SNRs region, it is obvious that the difference between the BER performance of the system with BTW SCM scheme and the system without SCM scheme is almost negligible.…”

Section: Resultsmentioning

confidence: 99%

“…BTW SCM scheme assumes that the subcarriers from the first hop, which are increasingly ordered according to their SNRs, are mapped to the decreasingly ordered subcarriers on the second hop. The BER performance analysis in [4] for DPSK (Differentially Phase Shift Keying) modulated OFDM FG AF relay system with SCM, performed through derivation of the closed form BER expressions, has approved the conclusions conducted in [5]. In this paper we examine the level of BER performance improvement of coherently modulated dual-hop OFDM VG AF relay system, achieved through SCM at the R station.…”

Section: Introductionmentioning

confidence: 93%

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Performance enhancement of OFDM non-regenerative Variable Gain relay systems

Kočan

Pejanović-Djurišić

2012

2012 16th IEEE Mediterranean Electrotechnical Conference

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In this paper the level of bit error rate (BER) performance enhancement achieved by subcarrier mapping (SCM) at the relay (R) station in dual-hop OFDM nonregenerative Variable Gain (VG) relay system, is examined. Closed form BER expressions are derived for the assumed M-QAM (M-ary Quadrature Amplitude Modulation) modulated system, in the case of Rayleigh fading channels on both hops, when two SCM schemes denoted as Best-to-Best SCM (BTB SCM) and Best-to-Worst SCM (BTW SCM) are implemented.The obtained results show that, for all the signal-to-noise ratio values of interest, the analyzed relay system with BTB SCM achieves better BER performance, or at least the BER performance equal to the case when BTW SCM scheme is implemented. Having in mind that BTB SCM scheme also maximizes the system capacity, it is shown that it can be considered as the optimal SCM scheme for the OFDM nonregenerative VG relay system.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 93%

Performance enhancement of OFDM non-regenerative Variable Gain relay systems

Kočan

Pejanović-Djurišić

2012

2012 16th IEEE Mediterranean Electrotechnical Conference

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“…Cooperative techniques for relay systems with OFDM based transmission were recently studied and proposed as in [7,8]. Typically, half-duplex relays with two time slots transmission were considered as in [7].…”

Section: Introductionmentioning

confidence: 99%

“…Typically, half-duplex relays with two time slots transmission were considered as in [7]. In [8], relays operating in fullduplex mode were considered and frequency sharing between the source and the relay was used.…”

Section: Introductionmentioning

confidence: 99%

Distributed coding/modulation scheme with OFDM/OQAM based transmission for wireless cooperative relays systems

Youssef

Caissiere

Hélard

et al. 2013

2013 IEEE 24th Annual International Symposium on Personal, Indoor, and Mobile Radio Communications (PIMRC)

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In this paper, we propose a distributed coding/modulation scheme for wireless broadcast networks with relays. We consider a scenario where a source communicates with a single destination assisted by a relay which aids transmission to the destination. Orthogonal frequency division multiplexing (OFDM) transmission is considered where the available bandwidth is allocated simultaneously to the source and the relay. Real value data symbols are transmitted by the source. The relay decodes the information from the sources and it re-encodes them to generate some extra redundancy, which is modulated onto real data symbols and transmitted to the destination with a time offset equal to half the signal interval. Hence, the proposed scheme can be regarded as a distributed OFDM/OQAM scheme between the source and the relay. The proposed scheme achieves good performance in terms of bit error rate. Moreover, it does not require insertion of guard interval achieving therefore spectral efficiency gain.

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“…In [3], the authors proposed an exact analytical technique for evaluation the average capacity of a dual OFDM system subcarrier mapping at the relay which is based on results of [2]. The BER performance of the best-to-worst and the best-to-best subcarrier mapping for OFDM AF relaying system is studied in [4]. In [5], the authors investigated the statiscal performance evaluation for both AF/DF protocol over Rayleigh fading environment.…”

Section: Introductionmentioning

confidence: 99%

On the performance of Amplify-and-Forward OFDM relaying with subcarrier mapping in Nakagami-m fading channels

Al-Qahtani

Nguyen³

et al. 2013

2013 International Conference on Computing, Management and Telecommunications (ComManTel)

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In orthogonal frequency division multiplexing (OFDM) relay system, subcarrier mapping at the relay has been shown to substantially improve the performance evidently. In this paper, we investigate the performance analysis of dual-hop OFDM relay systems with subcarrier mapping over Nakagami-m fading channels. A closed-form expression of outage probabilty is derived for Amplify-and-Forward OFDM Relay System with subcarrier mapping. The efficiency of the analytical performance is demonstrated through simulation results.

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Performance Evaluation of OFDM Amplify-and-Forward Relay System with Subcarrier Permutation

Cited by 31 publications

References 14 publications

Performance enhancement of OFDM non-regenerative Variable Gain relay systems

Performance enhancement of OFDM non-regenerative Variable Gain relay systems

Distributed coding/modulation scheme with OFDM/OQAM based transmission for wireless cooperative relays systems

On the performance of Amplify-and-Forward OFDM relaying with subcarrier mapping in Nakagami-m fading channels

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