Timing Synchronization in Decode-and-Forward Cooperative Communication Systems

Xiao, Li; Wu, Yik-Chung; Serpedin, Erchin

doi:10.1109/tsp.2008.2011834

Cited by 71 publications

(1 citation statement)

References 34 publications

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“…The performance analysis in terms of BER and Signal to Noise Ratio (Eb/N0) (SNR) are calculated for various time and carrier frequency offsets. Below are the simulated parameter specifications taken into our considerations [16].…”

Section: Performance Analysis Of Offsetsmentioning

confidence: 99%

Estimating Time and Frequency under Imperfect Channel Knowledge using ECM and SAGE Algorithms in Multi-relay Cooperative Networks

CHENGUTTUVAN,

KARUPPIAH,

2023

Preprint

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The OFDM system is popular due to its broadband capabilities, but because it employs the multi-carrier concept, synchronization issues may arise. These errors are caused by the incompatibility of the transmitted and received signals. The performance of multiple relay cooperative systems is assessed in this study using receiver compensation and estimation of Multicarrier Frequency Offsets (MCFO) and Multiple Timing Offsets (MTO). To demonstrate improved bit error rate (BER) performance, MCFOs and MTOs should be treated with less computational complexity. At the receiver end, the Maximum Likelihood (ML) approach is used to decode data and estimate offsets. The ML approach estimates using the ECM and SAGE algorithms. In terms of BER and SNR after estimation, the SAGE algorithm outperforms the ECM approach. A performance analysis of the estimated time and carrier frequency offsets was performed using the ECM and SAGE algorithms. Furthermore, the statistical percentage difference demonstrates that the maximum probability strategy for compensating the CFO and TO is effective.

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Section: Performance Analysis Of Offsetsmentioning

confidence: 99%

Estimating Time and Frequency under Imperfect Channel Knowledge using ECM and SAGE Algorithms in Multi-relay Cooperative Networks

CHENGUTTUVAN,

KARUPPIAH,

2023

Preprint

View full text Add to dashboard Cite

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Protocol design and data detection for two‐way relay networks with fractional asynchronous delays

Fang

Liang

Zhang

et al. 2012

Int J Communication

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SUMMARYIn wireless two‐way relay systems, it is difficult to achieve perfect timing synchronization among different nodes. In this paper, we investigate relaying protocol design and data detect schemes for asynchronous two‐way relaying systems to combat the intersymbol interference caused by asynchronous transmission. We consider fractional asynchronous delays and two schemes are proposed based on cyclic prefixed single carrier block transmission, namely, the receiver frequency domain equalization scheme and relay synchronization and network coding (RSNC) scheme. In the receiver frequency domain equalization scheme, the relay simply amplifies the received signal and forwards to the two source nodes, and fractionally spaced frequency domain equalizer (FS‐FDE) is employed at the receiver to recover the transmit data. In the RSNC scheme, the asynchronous signals are resynchronized with an FS‐FDE at the relay node. The output signals of FS‐FDE are then demodulated and network coded before forwarding to the two source nodes. In this RSNC scheme, data detection at the source nodes is the same as that in synchronous networks because the asynchronous signals have already been synchronized at the relay node. Simulation results show that the performance of both schemes is almost the same as in the perfect synchronized two‐way relaying systems. Copyright © 2012 John Wiley & Sons, Ltd.

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Low complexity timing estimation and resynchronization for asynchronous bidirectional communications with multiple antenna relay

Fang

Liang

Wang

et al. 2014

Int J Communication

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In this paper, we consider an asynchronous bidirectional communication system over flat fading channels in which the two source nodes are not perfectly synchronized. A low complexity pilot aided timing estimation and resynchronization scheme is proposed to combat the fractional asynchronous delay between the two source nodes. In the proposed scheme, cyclic prefixed single carrier block transmission is implemented at the two sources and frequency domain orthogonal pilots are transmitted to the relay simultaneously. After timing and channel estimation at the relay, a fractionally spaced frequency domain equalizer is employed at the relay to resynchronize the received mixed signals. With the proposed resynchronization scheme, the data detection at the two sources is the same as in a perfect synchronized system, because the two asynchronous signals are already resynchronized at the relay node. Simulation results show that the performance gap between the proposed scheme and the perfect synchronized system is within 1 dB when there are four antennas at the relay.

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Timing Synchronization in Decode-and-Forward Cooperative Communication Systems

Cited by 71 publications

References 34 publications

Estimating Time and Frequency under Imperfect Channel Knowledge using ECM and SAGE Algorithms in Multi-relay Cooperative Networks

Estimating Time and Frequency under Imperfect Channel Knowledge using ECM and SAGE Algorithms in Multi-relay Cooperative Networks

Protocol design and data detection for two‐way relay networks with fractional asynchronous delays

Low complexity timing estimation and resynchronization for asynchronous bidirectional communications with multiple antenna relay

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