IEEE Transactions on Wireless Communications, 2000
This paper describes a frame work for evaluating the coverage performance of an orthogonal freque... more This paper describes a frame work for evaluating the coverage performance of an orthogonal frequency division multiplexing (OFDM) system as defined in the IEEE 802.16e/WiMAX standard. Both the downlink and the uplink coverage are presented under a system with multiple cells and sectors. The spatial area coverage for a single frequency reuse and reuse of 3 are evaluated. Our results show that a WiMAX system can be uplink coverage limited for base station receivers with only two antennas. It is shown that there is a tradeoff between the uplink sector throughput and coverage performance. On the downlink, it is shown that a combination of cyclic delay diversity (CDD) with segmented frequency reuse of 3 significantly improves coverage performance. Also, shown is a comparison of downlink coverage performance between maximum ratio combining (MRC) and minimum mean square (MMSE) receivers at the subscriber station. It is shown that for a single frequency reuse an MMSE receiver with CDD at the transmitter are needed for adequate downlink coverage performance.
IEEE Journal of Selected Topics in Signal Processing, 2000
The methodology used to evaluate the performance of the various MIMO schemes in orthogonal freque... more The methodology used to evaluate the performance of the various MIMO schemes in orthogonal frequency division multiplexing (OFDM) WiMAXWiMAX stands for Worldwide Interoperability for Microwave Access. systems is described. The per-tone signal-to-noise plus interference ratio (SINR) of a MIMO OFDM system is derived in a multi user, multicell and multisector communication system. The sector average spectral efficiency for a coded
IEEE Transactions on Wireless Communications, 2000
This paper describes a frame work for evaluating the coverage performance of an orthogonal freque... more This paper describes a frame work for evaluating the coverage performance of an orthogonal frequency division multiplexing (OFDM) system as defined in the IEEE 802.16e/WiMAX standard. Both the downlink and the uplink coverage are presented under a system with multiple cells and sectors. The spatial area coverage for a single frequency reuse and reuse of 3 are evaluated. Our results show that a WiMAX system can be uplink coverage limited for base station receivers with only two antennas. It is shown that there is a tradeoff between the uplink sector throughput and coverage performance. On the downlink, it is shown that a combination of cyclic delay diversity (CDD) with segmented frequency reuse of 3 significantly improves coverage performance. Also, shown is a comparison of downlink coverage performance between maximum ratio combining (MRC) and minimum mean square (MMSE) receivers at the subscriber station. It is shown that for a single frequency reuse an MMSE receiver with CDD at the transmitter are needed for adequate downlink coverage performance.
IEEE Journal of Selected Topics in Signal Processing, 2000
The methodology used to evaluate the performance of the various MIMO schemes in orthogonal freque... more The methodology used to evaluate the performance of the various MIMO schemes in orthogonal frequency division multiplexing (OFDM) WiMAXWiMAX stands for Worldwide Interoperability for Microwave Access. systems is described. The per-tone signal-to-noise plus interference ratio (SINR) of a MIMO OFDM system is derived in a multi user, multicell and multisector communication system. The sector average spectral efficiency for a coded
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Papers by Louay Jalloul