A Time Domain Inverse Matrix Receiver for CFO Suppression in WIMAX Uplink System

2010 IEEE 71st Vehicular Technology Conference Pub Date : 2010-05-16 DOI:10.1109/VETECS.2010.5493833

Xiupei Zhang, H. Ryu, Jason H. Gao

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引用次数: 1

Abstract

In orthogonal frequency division multiple access (OFDMA) uplink system, orthogonal multiple subcarriers are assigned to different users for parallel high data rate communications. However, carrier frequency offset (CFO), which is mainly due to oscillator mismatches and/or Doppler shift, will destroy the orthogonality among subcarriers and introduce intercarrier interference (ICI) as well as multiple-access interference (MAI) in uplink scenario. Thus, system performance will be seriously degraded. To overcome this problem, it is of great importance to do research on suppression of the interferences caused by CFO. In this paper, we proposed a novel time domain inverse matrix receiver to suppress the interference of multiple CFOs. Compared with the conventional frequency domain direct ZF inverse matrix method, which has high complexity in obtaining the ICI matrix and its inverse matrix, the proposed method has very low complexity in obtaining the interference matrix. Furthermore, the signal after interference suppression is a frequency domain signal. Thus the receiver complexity can be simplified. Simulation results show that this algorithm has almost the same performance to the frequency domain direct ZF inverse matrix method.

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用于WIMAX上行系统CFO抑制的时域逆矩阵接收机

在正交频分多址(OFDMA)上行系统中，将正交多个子载波分配给不同的用户，实现并行的高数据速率通信。然而，主要由振荡器失配和/或多普勒频移引起的载波频偏(CFO)会破坏子载波之间的正交性，并在上行场景中引入载波间干扰(ICI)和多址干扰(MAI)。因此，将严重降低系统性能。为了克服这一问题，对财务总监干扰的抑制进行研究就显得尤为重要。本文提出了一种新的时域逆矩阵接收机来抑制多个cfo的干扰。与传统频域直接ZF逆矩阵法获取ICI矩阵及其逆矩阵的复杂度较高相比，该方法获得干涉矩阵的复杂度非常低。干扰抑制后的信号是频域信号。这样可以简化接收机的复杂度。仿真结果表明，该算法与频域直接ZF逆矩阵法具有基本相同的性能。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2010 IEEE 71st Vehicular Technology Conference

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