A Simplified Equalization Method for Dual PN-Sequence Padding TDS-OFDM Systems
A Simplified Equalization Method for Dual PN-Sequence Padding TDS-OFDM Systems
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DOI：
10.1109/tbc.2008.2001725
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发表时间：
2008-12-01
影响因子：
4.5
通讯作者：
Yang, Zhi-Xing
中科院分区：
文献类型：
--
作者：
Fu, Jian;Wang, Jun;Yang, Zhi-Xing
时域同步正交频分复用（TDS-OFDM）调制方案比传统的循环前缀（CP） OFDM技术提高了频谱效率，但由于接收端采用了迭代填充减法（IPS）来减轻多径传播引起的码间干扰，从而减少了计算量。本文提出了一种简化的双pn -序列填充TDS-OFDM系统均衡方案。虽然与IPS算法相比，该方法所需的填充PN序列长度增加了一倍，导致频谱效率略有下降，但在实际应用中，该方法比IPS算法节省了90%左右的计算量。计算机仿真验证了该方法在时变衰落信道下的误码率和最大多普勒频率均优于IPS方法。
Time domain synchronous orthogonal frequency division multiplexing (TDS-OFDM) modulation scheme can improve the spectrum efficiency over the traditional Cyclic Prefix (CP) OFDM technology at the cost of computational efforts due to the iterative padding subtraction (IPS) at the receiver to mitigate the inter symbol interference caused by the multipath propagation. In this paper, a simplified equalization scheme is presented for the dual PN-sequence padding (DPNP) TDS-OFDM systems. Although the length of the padded PN sequence needed is double compared to what needed by the IPS, leading to slight decrease of the spectrum efficiency, this method can save about 90% computational effort in practice compared with that of the IPS algorithm. It also outperforms IPS method under the time-varying fading channel in terms of symbol error rate and maximum Doppler frequency, verified by the computer simulation.