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The non-orthogonal multiple access (NOMA) technology has been proposed and regarded as one of the potential promising technologies for the future 5G network. The extension of generalized spatial modulation multiple-input multiple-output (MIMO) to NOMA system improves both the spectral and energy efficiencies of the system, while maintaining the massive connectivity and low latency advantages, but...
Channel estimation for underwater acoustic (UWA) channels in orthogonal frequency division multiplexing (OFDM) systems is one of the most difficult problems in UWA communications. Because UWA channels are both frequency-selective and time-selective, the total number of channel coefficients to be estimated will significantly increase. Besides, the fast time-varying characteristics and strong Doppler...
Recently, some orthogonal multiple access schemes are utilized in return channels. However, in the field of wireless communication, as the number of users increases, the orthogonal resources are difficult to meet the explosive demand of access. For this reason, some non-orthogonal multiple access (NOMA) schemes have been proposed to solve the key problem of massive connectivity. In this paper, we...
Recently, many key techniques which was proved effective in radio communication have been utilized in underwater acoustic (UWA) communication, such as multiple-input multiple-output (MIMO) and orthogonal frequency division multiplexing (OFDM). Channel estimation for MIMO-OFDM systems has been improved observably based on compressive sensing (CS) techniques. In recent years, by exploiting the inherent...
Recently, a new orthogonal frequency division multiplexing (OFDM) scheme called time-frequency training OFDM (TFT-OFDM) has been proposed. Compared to the conventional cyclic prefix OFDM (CP-OFDM) or time-domain synchronous OFDM (TDS-OFDM) which only relies on either frequency-domain pilots or time-domain pseudo noise (PN) sequence for channel estimation, the proposed TFT-OFDM uses PN sequence to...
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