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In this paper, we propose a novel resource allocation algorithm based on proportional fairness in multiuser OFDM systems. Because the utility function is always used for the optimization and achieving the tradeoff between the efficiency and fairness, the proportional fairness optimization problem can be formulated as maximizing the utility function, which is the sum of logarithmic user data rate....
This paper presents a rotated quasi-orthogonal space-time block codes (RQOSTBC) scheme for OFDM communication based on IEEE 802.16 protocol. At the transmitter, the data streams for the OFDM tones enter separate QOSTBC coders whose outputs are then forwarded to the different antennas. At the receiver, the pairwise decoding can be employed. The SUI channel model which is recommended by the IEEE 802...
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, we derived closed-form expressions for the SINR distributions in OFDMA cellular system using fixed relays. First of all, the intercell interference at the BS and the RS are characterized and it is found that the intercell interference power is successfully modeled as the average of it. From the interference power modeling, the pdfs of SINRs for the four uplink cases are analyzed. The...
In this paper, we have formulated the problem of cross layer throughput-maximized dynamic resource management with guaranteed QoS in MIMO OFDM beamforming systems. In order to reduce of the amount of feedback information and computation complexity, OFDM subcarriers are grouped into subchannels based on the fact that adjacent subcarriers experience the same fading. According to characteristics of various...
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