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Based on time shift properties of discrete Fourier transform, the constellation point distribution of orthogonal frequency division multiplexing (OFDM) system in multi-path channel is analyzed. Although inter-symbol interference (ISI) of OFDM can be mitigated by using cyclic prefix whose length is longer than the maximum multi-path delay of wireless channel, the constellation of OFDM symbol sharply...
Accurate channel estimation is one of the significant technologies to improve the coherent demodulation performance for orthogonal frequency division multiplexing (OFDM). Based on the recursive least square (RLS)-based threshold judgement, a joint estimation algorithm for long term evolution (LTE) downlink is proposed in this paper. Using the frequency domain pilots, we use the least squares criterion...
Accurate channel state information (CSI) is necessary for correctly receiving information. Compressive sensing has been used for channel estimation because of the sparsity of the wireless multipath channel. Based on compressive sensing, the channel estimation performance by setting pilots randomly is much better than uniformly and successively. This paper proposed a scheme for security communication...
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