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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...
A cross-layer design of packet scheduling and resource allocation based on beamforming for multiuser MIMO-OFDM systems is presented in this paper. First, we design beamforming vectors in order to convert the MIMO channels into equivalent single-input single-output (SISO) channels and choose the main SISO channel to transmit packets. Then we use a multi-strategy scheduler to schedule packets of all...
In this paper, downlink multiple input multiple output (MIMO) multiuser transmission using precoding in fixed relay networks is studied. We propose two relay-assisted MIMO multiuser precoding models. For the first model, multiuser precoding is performed at base station (BS). The fixed relay processes the received signal and forwards it, which is amplify- and-forward. While for the second model, the...
In this paper, we investigate the cross-layer design of packet scheduling and adaptive resource allocation in multiuser MIMO-OFDM systems based on STBC. First we group different types of service into four types according to 802.16 protocol. Then we use a two-layer scheduling architecture to shape traffic at medium access (MAC) layer: the first layer schedules packets for different users of the same...
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...
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