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In this correspondence, we investigate the impact of power and continuous-rate adaptation using variable-power M-ary quadrature amplitude modulation (MQAM) on spectral efficiency of orthogonal frequency-division multiplexing (OFDM) systems subject to carrier frequency offset (CFO) in Rayleigh fading channels with perfect and imperfect channel information at the transmitter. Convex optimization-based...
In order to improve the system performance over both frequency- and time-selective fading channels, orthogonal frequency division multiplexing (OFDM) system with transmit diversity technique is an effective and attractive solution. However, the received signal is the superposition of the signals from different transmit antennas. Hence, to obtain accurate channel state information (CSI) is difficult...
In this paper, we propose a blind channel estimation method for advanced terrestrial digital multimedia broadcasting (AT-DMB) systems which use orthogonal frequency division multiplexing with hierarchical subcarrier modulation. The AT-DMB system adopts hierarchical 16-ary quadrature amplitude modulation to ensure backward-compatibility with the traditional T-DMB systems, which use differential quadrature...
Orthogonal frequency division multiplexing offset quadrature amplitude modulation (OFDM/OQAM) is a multi carrier modulation using staggered transmission on the I and Q axes. It uses as well an optimized non-rectangular pulse shaping. There are several advantages with respect to the conventional OFDM modulation, while the main drawback is the intrinsic intersymbol interference, hindering e.g. a proper...
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