Title | ||
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Multi-Node ML Time and Frequency Synchronization for Distributed MIMO-Relay Beamforming Over Time-Varying Flat-Fading Channels |
Abstract | ||
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In this paper, we investigate maximum likelihood (ML) time delay (TD) and carrier frequency offset (CFO) synchronization in multi-node decode-and-forward cooperative relaying systems operating over time-varying channels. This new synchronization scheme is embedded into a distributed multiple input multiple output (MIMO)-relay beamforming transceiver structure to avoid the drawbacks of multidimensional ML estimation at the destination and to minimize the overhead cost. By accounting for a perfect Doppler spread value, the new synchronization solution delivers accurate TD and CFO estimates. For real-world operation, however, this new technique can be jointly implemented with any Doppler spread estimator in a new iterative scheme using a time-constant channel (TCC)-based synchronization method at the initialization step. The resulting TD and CFO estimates along with the channel estimates are then fed into a distributed MIMO-relay beamforming transceiver of
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single-antenna nodes, for pre-compensation at each node of the transmitted signals, to ensure constructive maximum ratio combining (MRC) at the destination. Simulation results show significant synchronization accuracy improvement over previous distributed multi-node synchronization techniques assuming TCCs. The latter translates into noticeable gains in terms of useful link-level throughput, more so at higher Doppler or with more relaying nodes. |
Year | DOI | Venue |
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2019 | 10.1109/TCOMM.2018.2889089 | IEEE Transactions on Communications |
Keywords | Field | DocType |
Synchronization,Relays,Array signal processing,Doppler effect,MIMO communication,Maximum likelihood estimation | Beamforming,Synchronization,Transceiver,Computer science,Maximal-ratio combining,Fading,Carrier frequency offset,MIMO,Electronic engineering,Throughput | Journal |
Volume | Issue | ISSN |
67 | 4 | 0090-6778 |
Citations | PageRank | References |
0 | 0.34 | 0 |
Authors | ||
6 |
Name | Order | Citations | PageRank |
---|---|---|---|
Souheib Ben Amor | 1 | 9 | 5.62 |
Sofiène Affes | 2 | 962 | 97.26 |
Faouzi Bellili | 3 | 223 | 28.35 |
Usa Vilaipornsawai | 4 | 8 | 2.83 |
Liqing Zhang | 5 | 61 | 5.19 |
Peiying Zhu | 6 | 295 | 16.35 |