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In this paper, the downlink ergodic rate of distributed antenna systems (DASs) is studied with linear beamforming under pilot contamination. Utilizing Jensen's inequality and the properties of Gamma distribution, we derive a closed-form expression of the achievable rate with maximum ratio transmission (MRT) beamforming. Then, based on the approximation for non-isotropic vectors as well as the properties...
Partial FFT demodulation is a newly-emerging technique to mitigate the inter-carrier interference (ICI) of orthogonal frequency division multiplexing (OFDM) systems over time-varying underwater acoustic channels. In this letter, we extend the partial FFT demodulation method for a single-input single-output (SISO) configuration to the multiple-input multiple-output (MIMO) case. By assuming no channel...
Orthogonal Frequency Division Multiplexing (OFDM) as a leading technology in 4G wireless communication shows great robustness against multipath spread, because the orthogonal subcarriers transform the frequencyselectivewideband channel into parallel flat fading narrowband sub-channels. This advantage has arose great interest into underwater OFDM transmission, since multipath spread is a significant...
With the development of underwater acoustic (UWA) communication network technology and improvement of embedded digital signal processing chip, acoustic modem has received much attention recent years. By analyzing power consumption, board size, reliability and flexibility in application, we implement the acoustic modem based on the OMAP-L138 board. The modular algorithm is based on block-by-block processing...
High speed forms of transportation as airplane, maglev, and low-earth-orbit satellite, arising great demand of high dynamic communication, which reveals the insufficiency of channel estimation without reliable doppler compensation. This paper proposes to use energy sorting to eliminate small component in time domain channel estimation, and adopt doppler shift to further revised the channel parameter...
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