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Orthogonal Frequency Division Multiplexing (OFDM) based waveform has been widely used as illuminator of opportunity in passive radar systems. Ambiguity function (AF) of OFDM is shown to be nearly perfect thumbtack shaped except for the undesirable high side lobes in the Doppler dimension. In this paper, we propose a novel filtered OFDM scheme to improve OFDM AF by utilizing Filtered Bank Multi-Carrier...
Low density signature for orthogonal frequency division multiplexing (LDS‐OFDM) is a promising technique for multiple accesses in wireless communications, but its performance is not optimal. In this paper, we study a non‐binary joint sparse graph which combines LDS‐OFDM and non‐binary low density parity check (LDPC) codes, namely non‐binary joint sparse graph for OFDM (NJSG–OFDM). Considering the...
This paper presents the influence on performance in SC-FDE (Single Carrier with Frequency Domain Equalization) without CP (cyclic prefix) system. ICI (Inter Carrier Interference) is imposed since channel respond not appear circular. To alleviate the interference, we propose a simple method by using the tail data in the frame to compensate. But error is also introduced. In order to reduce it, iteration...
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