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HF channel sounding requires perfect autocorrelation property of the sounding sequences. Compared with other pseudonoise sounding sequences, Zadoff-Chu sequence gets great attention due to its predominant periodic autocorrelation property. In order to adapt the spectrum property of Zadoff-Chu sequence to the requirement of HF channel sounding transmitter-receiver, the Formula Direct Interpolation...
Orthogonal frequency division multiple access (OFDMA) is an emerging multiple access technology. In this paper, we focus on the packet scheduling problems of the downlink of OFDMA wireless systems with delay requirements. We revised three different scheduling methods in order to reduce their complexity for practical application based on limited feedback. Furthermore, we simulate these algorithms under...
A cross-layer design based on precoding and partial feedback for multiuser MIMO-OFDM systems is presented in this paper. First, we design precoder vectors with partial feedback in order to convert the MIMO channels into equivalent single-input single-output (SISO) channels. Then we can divide the radio resource into many space-time-frequency (STF) three dimension resource units. Then we present a...
In this paper, adaptive transmission using channel rank for MIMO-OFDM system is considered. Different transmission schemes have different diversity and multiplexing tradeoff characters. Adjusting MIMO transmission scheme according to channel quality indicator (CQI) or channel state information will improve system performance. We propose a new transmission adaptation solution depending on two-dimensional...
Different transmission schemes have different diversity and multiplexing tradeoff characters. Adjusting MIMO transmission scheme according to channel quality indicator (CQI) or channel state information will improve system performance. This paper proposes a new transmission adaptation solution depending on two-dimensional channel quality indicators with the aim to enhance system throughput performance...
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