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Optimal demodulation device and demodulation method for CPM signal

A technology for demodulating equipment and signals, which can be used in phase-modulated carrier systems, shaping networks in transmitters/receivers, baseband system components, etc., and can solve problems such as performance loss

Inactive Publication Date: 2013-09-04
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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  • Optimal demodulation device and demodulation method for CPM signal
  • Optimal demodulation device and demodulation method for CPM signal
  • Optimal demodulation device and demodulation method for CPM signal

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Embodiment Construction

[0079] 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.

[0080] 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 invention provides an optimal demodulation device and demodulation method for a CPM signal. The optimal demodulation device at least comprises a phase rotation module, a matched filter module and a viterbi maximum likehood sequential detector. The algorithm principle of the optimal demodulation device and demodulation method for the CPM signal is the same as the optimal demodulation algorithm MLSD of a CPM, the demodulation performance of the optimal demodulation device and demodulation method for the CPM signal is completely same as that of the MLSD algorithm, but complexity of the optimal demodulation device and demodulation method for the CPM signal is greatly reduced. By the adoption of the algorithm, modulation factors can be selected arbitrarily, and the complexity of demodulation is not taken into consideration. The select range of the modulation factors is expanded from rational number to irrational number, arbitrary real number can serve as the modulation factors, and the application range of CPM modulation is expanded.

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