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A kind of optimal demodulation equipment and demodulation method of cpm signal

A demodulation device and optimal technology, applied in phase modulation carrier system, shaping network in transmitter/receiver, baseband system components, etc., can solve problems such as performance loss, reduce complexity and expand application range Effect

Inactive Publication Date: 2017-11-07
SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since this method only extracts a piece of data for demodulation, it also brings performance loss

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  • A kind of optimal demodulation equipment and demodulation method of cpm signal
  • A kind of optimal demodulation equipment and demodulation method of cpm signal
  • A kind of optimal demodulation equipment and demodulation method of cpm signal

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Embodiment Construction

[0081] Embodiments of the present invention are described below through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific implementation modes, and various modifications or changes can be made to the details in this specification based on different viewpoints and applications without departing from the spirit of the present invention.

[0082] The invention proposes a new CPM optimal demodulation algorithm. The principle of the CPM demodulation algorithm is the same as that of the maximum likelihood sequence detection algorithm. It is also based on the state grid diagram and finds a possible estimated sequence α(a 1 ,a 2 ,...,a n ) to maximize the conditional probability P(α|r(t)). That is, under the condition that the received signal is r(t), the sequence α has t...

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Abstract

The present invention provides an optimal demodulation device and a demodulation method of CPM signals. The optimal demodulation device at least includes: a phase rotation module, a matched filter module and a Viterbi maximum likelihood sequence detector. The algorithm principle of the optimal demodulation equipment and demodulation method of the CPM signal of the present invention is the same as the optimal demodulation algorithm MLSD of CPM, and the demodulation performance is exactly the same as the MLSD algorithm, and the complexity is then greatly reduced; The algorithm can choose the modulation coefficient arbitrarily without considering the complexity of the demodulation; and the selection range of the modulation coefficient is extended from rational numbers to irrational numbers, and any real number can be used as the modulation coefficient, which expands the application range of CPM modulation.

Description

technical field [0001] The invention belongs to the field of wireless communication, and in particular relates to an optimal demodulation device and a demodulation method of a CPM signal. Background technique [0002] Modulation is the process of embedding information into a carrier wave. Messages are carried in analog or digital form by carrier wave amplitude, frequency, phase, or a combination of the three, and then sent. [0003] According to the nature of the modulation signal, digital modulation technology can be divided into two types: constant envelope modulation and non-constant envelope modulation. The signal generated by the constant envelope modulation has a constant envelope and can work in the nonlinear amplification region of the power amplifier, so it has good power efficiency; the envelope of the non-constant envelope modulation signal will change with time, In order to avoid nonlinear distortion, the power amplifier needs to work in the linear amplificatio...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/22H04L25/03
Inventor 康凯钱骅
Owner SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI