Analysis of the uplink of an asynchronous multi-user DMT OFDMA system impaired by time offsets, frequency offsets, and multi-path fading
Analysis of the uplink of an asynchronous multi-user DMT OFDMA system impaired by time offsets, frequency offsets, and multi-path fading
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受时间偏移、频率偏移和多径衰落影响的异步多用户 DMT OFDMA 系统上行链路分析
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发表时间：
2000
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通讯作者：
Silvano Pupolin
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作者：
Andrea M. Tonello;N. Laurenti;Silvano Pupolin
通过分析研究了采用离散多音调制解调的异步多用户无线通信系统上行链路中时偏、频偏和多径衰落的联合影响。我们推导出的多址干扰的解析表达式，我们量化其不利影响，通过评估的平均SINR，和符号错误率的性能。其结果是，它示出的MAI强烈地依赖于不仅对上述损害，但也对用于复用用户的音调分配算法。基于我们的分析，插入适当的时间和频率的保护间隔和音调分配算法的准确选择有效地降低多址干扰，从而可以满足一个适当的权衡频谱效率，以优化系统性能。
We study through analysis the joint effect of time offsets, frequency offsets, and multi-path fading in the uplink of an asynchronous multi-user system for wireless communications deploying discrete multi-tone modulation and demodulation. We derive analytical expressions for the multiple access interference, and we quantify its detrimental effects through the evaluation of both the average SINR, and the symbol-error-rate performance. As a result it is shown that the MAI strongly depends not only on the aforementioned impairments but also on the tone assignment algorithm used to multiplex the users. Based on our analysis, the insertion of appropriate time and frequency guard intervals and the accurate selection of the tone assignment algorithm effectively reduce the MAI, so that a proper trade off with spectral efficiency can be met to optimize system performance.