Energy-efficient orthogonal frequency division multiplexing scheme based on time–frequency joint channel estimation ISSN 1751-8628
Abstract— 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 < Final Year Projects 2016 > 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.
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