Implementation of a MIMO OFDM-based wireless LAN system
Implementation of a MIMO OFDM-based wireless LAN system
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DOI：
10.1109/tsp.2003.820989
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发表时间：
2004-02
影响因子：
5.4
通讯作者：
A. V. Zelst;T. Schenk
中科院分区：
文献类型：
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作者：
A. V. Zelst;T. Schenk
多输入多输出(MIMO)信号处理与正交频分复用(OFDM)的结合被认为是提高工作在频率选择性衰落环境中的下一代无线通信系统数据速率的一种有前途的解决方案。为了实现使用MIMO的这一扩展，需要在基带信号处理方面进行一些改变。概述了必要的变化，包括时间和频率同步、信道估计、同步跟踪和MIMO检测。作为测试用例，考虑了基于ofdm的无线局域网(WLAN)标准IEEE 802.11a，但结果具有更广泛的适用性。在一个具有三个发射天线和三个接收天线的系统中实现了完整的MIMO-OFDM处理，并通过仿真和实验测试结果对其性能进行了评估。在典型办公环境中使用该MIMO ofdm系统进行测量的结果显示，与单天线ofdm系统相比，系统吞吐量平均翻了一番。由于发送器和接收器分支之间的耦合，吞吐量的平均预期三倍很可能没有实现。
The combination of multiple-input multiple-output (MIMO) signal processing with orthogonal frequency division multiplexing (OFDM) is regarded as a promising solution for enhancing the data rates of next-generation wireless communication systems operating in frequency-selective fading environments. To realize this extension of OFDM with MIMO, a number of changes are required in the baseband signal processing. An overview is given of the necessary changes, including time and frequency synchronization, channel estimation, synchronization tracking, and MIMO detection. As a test case, the OFDM-based wireless local area network (WLAN) standard IEEE 802.11a is considered, but the results are applicable more generally. The complete MIMO OFDM processing is implemented in a system with three transmit and three receive antennas, and its performance is evaluated with both simulations and experimental test results. Results from measurements with this MIMO OFDM system in a typical office environment show, on average, a doubling of the system throughput, compared with a single antenna OFDM system. An average expected tripling of the throughput was most likely not achieved due to coupling between the transmitter and receiver branches.