【摘要】 为了补偿数字电视发射机的频谱畸变与相位失真 ,以得到最佳的 VSB频谱特性 ,可以在调制器中加入预均衡网络对频谱进行预畸变 .从信号复包络理论出发 ,分析并提出了数字电视 VSB调制器中预均衡网络的实现算法及其 FPGA硬件实现结构 .计算机仿真和实际硬件实现结果都证明该算法的有效性与优越性 ,从而为突破调制器性能瓶颈提供了一个可行的解决方案 .更多还原

【Abstract】 To minimize the frequency and phase distortion in a DTV transmitter in order to achieve best VSB frequency performance, a pre equalizer can be inserted into the modulator. Based on the complex envelope theory, a pre equalizer algorithm and its hardware implementation architecture with FPGA was brought forwards and analyzed. The results from both computer simulation and hardware realization showed the validity and advantage of this algorithm and structure, which provide a practical solution to break the modulator’s performance bottleneck.更多还原