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Energy-efficient orthogonal frequency division multiplexing scheme based on time–frequency joint channel estimation ISSN 1751-86

Energy-efficient orthogonal frequency division multiplexing scheme based on time–frequency joint channel estimation ISSN 1751-86

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Energy-efficient orthogonal frequency division multiplexing scheme based on time–frequency joint channel estimation ISSN 1751-8628

 Time-domain synchronous orthogonal frequency division multiplexing (TDS-OFDM) enjoys the higher spectrum efficiency and faster synchronization than the classical cyclic prefix OFDM (CP-OFDM). However, TDS-OFDM suffers from performance degradation especially under severely fading channels with long delays. To solve these problems, the authors propose an energy-efficient OFDM scheme called time–frequency-training orthogonal frequency division multiplexing (TFTOFDM) based on the time–frequency joint channel estimation under the framework of compressive sensing (CS). The power of the guard interval (GI) in the proposed scheme can be reduced to achieve higher energy efficiency, which is infeasible for CP-OFDM. This method first utilises the time-domain pseudo noise sequence to acquire partial support information of the channel, and then some frequency-domain pilots are used for the exact channel estimation. Simulation results show that TFTOFDM with CS can achieve much higher energy efficiency than the classical CP-OFDM, and outperforms the conventional OFDM schemes in both static and mobile environments. Moreover, for the channel with long delay spread, the TFT-OFDM scheme with CS can demonstrate robustness and much better performance than the conventional OFDM schemes. In this way, the TFT-OFDM scheme can use the same GI length for larger broadcasting coverage and hence further achieve higher energy efficiency.


 


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  • Model: PROJ5692
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This product was added to our catalog on Tuesday 27 September, 2016.

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