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Continuous phase modulation achieving method based on pulse function weighing

A technology of phase modulation and implementation method, which is applied in the direction of phase modulation carrier system, etc., and can solve problems such as poor frequency band utilization and poor bit error rate performance

Inactive Publication Date: 2014-10-01
HARBIN ENG UNIV
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Problems solved by technology

In general, CPM signals based on simple rectangular pulse functions have good bit error rate performance, but poor bandwidth utilization. In contrast, CPM signals based on continuous smooth cosine pulse functions have high Bandwidth utilization, but poor bit error rate performance

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  • Continuous phase modulation achieving method based on pulse function weighing
  • Continuous phase modulation achieving method based on pulse function weighing
  • Continuous phase modulation achieving method based on pulse function weighing

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Embodiment Construction

[0025] Below in conjunction with accompanying drawing and example the present invention is described in more detail:

[0026] The low density parity-check code-continuous phase modulation (Low Density Parity Code-Continous Phase Modulation, LDPC-CPM) signal system based on the continuous phase modulation model proposed by the present invention is as follows:

[0027] In conjunction with external binary LDPC codec, bit interleaver, gray mapper, continuous phase modulation-soft input soft output (Continous Phase Modulation-Soft Input Soft Output, CPM-SISO) demodulator etc., construct based on the present invention A serial cascaded LDPC-CPM system model of the proposed continuous phase modulation model.

[0028] At the transmitting end, the dimension of the check matrix of the LDPC code is m×n, then the code length of the LDPC code is n, the information bit k=n-m, and the code rate r=k / n=1-m / n, in order to facilitate multi-ary Mapping, take n=log 2 Integer multiples of M. Inf...

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Abstract

The invention relates to a continuous phase modulation achieving method, in particular to a continuous phase modulation achieving method based on pulse function weighing. The continuous phase modulation achieving method includes the steps that system numbers, correlation lengths and modulation indexes of continuous phase modulation signals are selected, and rectangular pulse signals and cosine pulse signals are generated by a rectangular pulse generator and a cosine pulse generator respectively; two optimal weighing coefficients are selected according to the evaluation criterion of validity and reliability, and the weighed rectangular pulse signals and the weighed cosine pulse signals are obtained; modulation signals are obtained through the weighed rectangular pulse signals and a new pulse signal obtained through an adder. According to the continuous phase modulation achieving method, the overall good effect of the two indexes of the validity and the reliability of a digital communication system can be obtained, the increasing demands in the aspects of the error rate, the band utilization rate and the power efficiency of engineering can be met, and the continuous phase modulation achieving method is particularly suitable for wireless channels which are limited in power and bandwidth.

Description

technical field [0001] The invention relates to a method for realizing continuous phase modulation, in particular to a method for realizing continuous phase modulation based on pulse function weighting processing. Background technique [0002] With the increasing shortage of communication resources and the continuous improvement of people's requirements for communication, urgently seeking more effective modulation methods has become a hot research topic. In 1981, T.Aulin and C.-E.Sundberg proposed continuous phase modulation-part I, part II, IEEE Trans.on Communication, vol.COM-29, No3, 1981, 196-125. Phase modulation (Continous Phase Modulation, CPM), and the general expression, phase characteristics, spectrum characteristics and bit error rate performance of the modulated signal are given a very complete summary and induction. Continuous phase modulation is a nonlinear digital modulation scheme. It is a modulation method that loads digital information on the phase and ens...

Claims

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Application Information

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IPC IPC(8): H04L27/20
Inventor 薛睿孙岩博魏强曹庆铭
Owner HARBIN ENG UNIV
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