Synchronization is a complex task in uplink Orthogonal Frequency Division Multiple Access (OFDMA) for Mobile WiMax as each user presents different Carrier Frequency Offsets (CFO). Synchronization begins with the CFO estimation and followed by the compensation of residual CFO present in the received signal. This paper deals with various techniques in time and frequency domains to compensate the effect of CFO on the received signal for different estimation techniques. SImple time domain MultiUser Interference Cancellation (SIMUIC) performs in time domain. It employs delays in the compensation of CFO while synchronizing the last user. Decorrelation Successive Interference Cancellation (DC-SC) and Integrated Estimation and Compensation (IEC) perform in frequency domain for the compensation of CFO. These approaches are more complex for Inter-Carrier Interference (ICI) cancellation. In this paper, we propose a new efficient CFO compensation technique in frequency domain for different estimation methods. This technique is a modified version of IEC for reducing the CFO effect on the received signal with lesser computations. Simulation results show that the modified IEC performs better than SIMUIC, DC-SC and IEC for different estimation methods.

中文翻译：

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用于上行链路移动 WiMax 的 OFDMA 中的高效 CFO 估计和补偿方法

同步是移动 WiMax 上行链路正交频分多址 (OFDMA) 中的一项复杂任务，因为每个用户呈现不同的载波频率偏移 (CFO)。同步从 CFO 估计开始，然后是对接收信号中存在的残余 CFO 的补偿。本文讨论了时域和频域中的各种技术，以针对不同的估计技术补偿 CFO 对接收信号的影响。简单时域多用户干扰消除 (SIMUIC) 在时域中执行。它在同步最后一个用户时使用延迟补偿 CFO。去相关连续干扰消除 (DC-SC) 和综合估计和补偿 (IEC) 在频域中执行以补偿 CFO。这些方法对于载波间干扰 (ICI) 消除来说更为复杂。在本文中，我们针对不同的估计方法在频域中提出了一种新的高效 CFO 补偿技术。该技术是 IEC 的修改版本，用于通过较少的计算减少对接收信号的 CFO 影响。仿真结果表明，对于不同的估计方法，改进的 IEC 的性能优于 SIMUIC、DC-SC 和 IEC。