Near constant envelope trellis shaping for PSK signaling
Near constant envelope trellis shaping for PSK signaling
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DOI：
10.1109/tcomm.2009.02.060673
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发表时间：
2009-02
影响因子：
8.3
通讯作者：
M. Tanahashi;H. Ochiai
中科院分区：
文献类型：
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作者：
M. Tanahashi;H. Ochiai
针对脉冲相移键控(PSK)系统的峰均功率比(PAR)降低问题，提出了一种强大的网格整形方法。该方法包括：1)对格形编码器进行记忆扩展，以捕捉脉冲整形滤波器冲激响应的全部效应；2)简单分支度量，量化滤波器输出的包络波动。仿真结果表明，即使采用滚降系数低至0.1的脉冲成形滤波器，也有可能获得接近恒定的包络。此外，由于所得到的信号轨迹是圆形的，所提出的系统还表现出对接收器处的采样定时抖动的鲁棒性。
In this paper, we propose a powerful trellis shaping for peak-to-average power ratio (PAR) reduction of pulse-shaped phase shift keying (PSK) systems. The proposed approach consists of 1) memory extension of trellis shaping encoder for capturing the full effect of pulse shaping filter impulse response, and 2) simple branch metrics that quantify envelope fluctuation of the filter output. Simulation results demonstrate that achieving near constant envelope is possible even if a pulse shaping filter with a roll-off factor as low as 0.1 is employed. Furthermore, due to the circular nature of the resulting signal trajectory, the proposed system also exhibits a robustness against sampling timing jitter at the receiver.