Method, device, computer program product and apparatus providing a multi-dimensional CPM waveform

Abstract

A method is described for generating a M-D CPM waveform as a constant envelope, continuous phase signal capable of conveying a plurality of information symbols per symbol interval. Additionally, it provides for reducing the phase state space of the M-D CPM waveform, for reducing a number of trellis states required for demodulation of the M-D CPM waveform, and for implementing generalized tilted phase decomposition to reduce the cardinality of the phase state space of the multi-dimensional CPM waveform by a factor of 2. A device, computer program product and apparatus are also described.

Description

technical field [0001] The exemplary and non-limiting embodiments of the present invention relate generally to methods, apparatus and computer program products for modulating information onto a carrier wave, such as a radio frequency carrier wave, and more particularly, to a class of devices known as continuous phase modulators. modulator) modulator. Background technique [0002] Attached are the following acronyms as defined: [0003] BLER block error rate [0004] BPF bandpass filter [0005] BPSK binary phase shift keying [0006] CE Convolutional Encoder [0007] CPE Continuous Phase Encoder [0008] CPM continuous phase modulation [0009] DFT Discrete Fourier Transform [0010] DL downlink (e.g. from base station to mobile device) [0011] GMSK Gaussian Minimum Shift Keying [0012] GSM Global System for Mobile Communications [0013] LPF Low Pass Filter [0014] MM memoryless modulator [0015] M-QAM M-ary QAM (M-ary QAM) [0016] OFDM Orthogonal Frequenc...

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Problems solved by technology

[0044] Furthermore, conventional CPMs have a time-inva

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