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Numerous power-loading techniques for wireless applications have been proposed in the literature. However, most of the existing power-loading schemes may not always be suitable for packet-access orthogonal frequency-division multiplexing (OFDM) systems. In this paper, we propose a Lagrange multiplier power-loading (LMPL) algorithm for packet-access OFDM systems with fixed modulation and coding transmission...
In the conventional pilot-symbol-aided channel estimation for the MIMO-OFDM system, the pilots should be orthogonal in frequency, time, code, or spatial domain to mitigate the inter- antenna interference. In the frequency domain multiplexed (FDMed) pattern, the training pilots transmitted from different antennas conventionally occupy different sub-carriers exclusively within the same OFDM symbol duration...
A channel estimation method based on sample-shift of time-domain signal is proposed for OFDM systems. Through artificial cyclic sample-shift of time-domain signal, the equivalent coherent bandwidth of OFDM systems can be broadened. Hence, the channel estimation errors, caused by the simple linear interpolation in frequency-domain, can be reduced due to the increase of correlation between neighboring...
A noise variance optimization method is proposed for the time and frequency dimension separate (2 times 1D) Wiener-filtered channel estimation of OFDM based systems. According to Wiener-filter theory, the noise variance is necessary to achieve optimal solution. For 2 times 1D Wiener-filtered channel estimation, the Wiener-filtering will be applied twice respectively in time and frequency dimension...
GOFDM (generalized OFDM) has been proposed as a tradeoff solution between cyclic prefix single carrier (CP-SC) and OFDM system that can alleviate the peak to average power ratio (PAPR) problem of OFDM. In this paper, a novel estimation method for the estimation of the received SNR of GOFDM signal that is required in the adaptive modulation and coding (AMC) is presented. The simulation results of the...
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