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Overview:

This paper evaluates the throughput performance of an OFDM WiMAX (IEEE 802.16-2004, Section 8.3) transmission system with Adaptive Modulation and Coding (AMC) by outdoor measurements. The standard compliant AMC utilizes a 3-bit feedback for SISO and Alamouti coded MIMO transmissions. By applying a 6-bit feedback and spatial multiplexing with individual AMC on the two transmit antennas, the data throughput can be increased significantly for large SNR values. The measurements show that at small SNR values, a single antenna transmission often outperforms an Alamouti transmission. The paper found that this effect is caused by the asymmetric behavior of the wireless channel and by poor channel knowledge in the two-transmit-antenna case. The performance evaluation is based on a measurement campaign employing the Vienna MIMO testbed.

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Format:PDFSize:1,254 KB
Date:Nov 2007
Pages:13

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