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QM-CPM modems with higher order signaling

机译:具有更高阶信令的QM-CPM调制解调器

摘要

A quadrature-multiplexed continuous phase modulation (QM-CPM) signal is made up of the real parts of two underlying CPM signals whose information content can be recovered from just their real parts. The real parts of two such signals are I/Q multiplexed and transmitted onto a single channel to approximately double the bits/Hz of the underlying CPM signals, while maintaining the same or similar minimum distance. A class of QM-CPFSK (QM-continuous phase frequency shift keyed) signals are presented that use binary signaling but more phase states, and M2-ary QM-CPFSK signals are derived from constant envelope M-ary CPFSK signals. M2-ary multi-amplitude CPFSK signaling schemes are constructed that maintain the same distance as known multi-amplitude CPFSK schemes, but more than double the bandwidth efficiency in bits/Hz. In addition to these CPFSK based embodiments, embodiments are provided that more generally use CPM, non-continuous phase modulated signals, and even trellis-based PAM based signals.
机译:正交多路复用连续相位调制(QM-CPM)信号由两个基础CPM信号的实部组成,这些信息的信息内容只能从其实部中恢复。两个这样的信号的实部被I / Q多路复用并发送到单个通道上,以使基础CPM信号的位/ Hz大约翻倍,同时保持相同或相似的最小距离。提出了一类使用二进制信令但相位状态更多的QM-CPFSK(QM连续相频移键控)信号,并且从恒定包络M-得到M 2 ary QM-CPFSK信号ary CPFSK信号。构造了M 2 个多振幅CPFSK信令方案,该方案与已知的多振幅CPFSK方案保持相同的距离,但带宽效率(以位/ Hz为单位)增加了一倍以上。除了这些基于CPFSK的实施例之外,还提供了更普遍使用CPM,非连续相位调制信号,甚至是基于网格的PAM的信号的实施例。

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