Bandwidth-efficient trellis coded modulation schemes

S. Ramseier
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引用次数: 7

Abstract

The author proposes a scheme that shapes the power density spectrum of the transmitted signal to reduce its bandwidth. The encoder is modeled as a finite-state machine consisting of a shift register and a mapper. A pulse-shaping filter generates time-limited or Nyquist pulses. The whole system is optimized with respect to bandwidth and power efficiency, where average-power and peak-power criteria are considered. The author presents the achievable data rates of systems with quaternary input symbols and an out-of-band power of -20 dB for the various mappers and pulse-shaping filters considered. It can be seen that bandlimited pulses allow roughly a doubling of the data rate with respect to time-limited pulses. The bandwidth gain that can be reached with proper coding is remarkable. The drawback is the increased receiver complexity needed to resolve the intersymbol interference.<>
带宽效率高的格子编码调制方案
作者提出了一种对传输信号的功率密度谱进行整形以减小其带宽的方案。编码器被建模为一个有限状态机,由移位寄存器和映射器组成。脉冲整形滤波器产生限时脉冲或奈奎斯特脉冲。整个系统在带宽和功率效率方面进行了优化,其中考虑了平均功率和峰值功率标准。作者给出了四元输入符号和带外功率为- 20db的系统可实现的数据速率,考虑了各种映射器和脉冲整形滤波器。可以看出,带宽限制脉冲允许相对于时间限制脉冲的数据速率大约翻倍。通过适当的编码可以获得显著的带宽增益。缺点是需要增加接收器的复杂性来解决码间干扰。
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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