OFDM系统中基于载波干扰比最大的预编码方案
doi: 10.3724/SP.J.1146.2005.01190
A New Pre-coding Scheme Based on Maximum of Carrier-to-Interference Ration for OFDM Systems
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摘要: OFDM系统对频率的偏移非常敏感。一种简单的1/2码率的预编码方案可以有效地抑制载波间干扰(Inter-Carrier Interference，ICI)，提高载波干扰比(Carrier-to-Interference Ratio，CIR)。该文提出了一种基于最大化载波干扰比原理的含参数的预编码方案。在估计系统频率偏移的情况下，这种方案可以通过简单的计算得到使载波干扰比最大的编码参数。实验证明，这种含有参数的预编码方案，可以有效地抑制载波间干扰，提高系统性能。Abstract: Orthogonal Frequency Division Multiplexing (OFDM) systems is very sensitive to frequency errors. An easy pre-coding scheme with rate 1/2 can reduce this sensitivity to frequency offset and compress the inter-carrier interference. A new pre-coding scheme based on the maximum of carrier-to-interference is proposed in this article. It can efficiently find the pre-coding parameter with known frequency offset. The simulation results shown that the new pre-coding scheme can outperform the traditional one.
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