摘要
介绍了基于XI LI NX FPGA的1Gb/s光OFDM(O-OFDM)发送端信号处理的整体设计,对传输信号的星座映射及FFT进行了研究,重点分析了不同量化比特数时IFFT/FFT的误差矢量幅度(EVM),提出了使用不同量化比特对信号进行适当放大而提高系统的IFFT-FFT转换精度的方法。实验验证了OFDM信号I FFT-FFT变换后随量化比特数的增加,EVM值不断减少,相应的星座图更收敛。
The letter introduce the integrated design of signal processing in a 1Gb/s optical orthogonal frequency division multiplexing（O-OFDM） transmitter based on XILINX FPGA.The constellation mapping and FFT were deeply investigated in the experiment and raised an IFFT/FFT algorithm with improved operational precision.The experimental results gave the error vector magnitude（EVM） of IFFT/FFT with different quantification bits.And the EVM value of OFDM signal through IFFT-FFT is declining with the quantization of the increase in the number of bits and the related constellation get a better convergence.
出处
《光通信技术》
CSCD
北大核心
2012年第8期47-49,共3页
Optical Communication Technology
基金
国家863计划(2009AA01Z220,2009AA01Z222)资助
国家自然科学基金(60977049)资助
