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Quaternary continuous phase modulation-demodulation method

A technology of phase modulation and demodulation method, applied in the direction of phase modulation carrier system, etc., can solve the problems of constant envelope spectrum efficiency and computational complexity, and achieve the effect of improving effective spectrum utilization, reducing synchronization, and increasing effective transmission power

Active Publication Date: 2014-05-21
10TH RES INST OF CETC
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Problems solved by technology

To solve the problems of constant envelope, spectral efficiency and computational complexity in high-speed communication systems

Method used

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  • Quaternary continuous phase modulation-demodulation method
  • Quaternary continuous phase modulation-demodulation method
  • Quaternary continuous phase modulation-demodulation method

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Embodiment Construction

[0017] exist figure 1 In the modulation and transmission principle of the quaternary continuous phase modulation signal described, the signal modulation structure consists of a signal selection logic module (1), a baseband signal collection module (2) and an I, Q modulation module (3) connected in series. The I and Q modulation modules include local oscillators and 90° phase shifters connected in parallel on the I and Q closed-loop loops. The baseband signal collection module (2) in the modulation system contains 16 pre-designed baseband signals, satisfying that the transfer between any two positions in the 4 position points in the constellation locus diagram can be realized with the only one of the 16 baseband signals , the baseband signal collection module 2 stores all 16 pre-designed baseband signals; wherein, the signal selection logic module 1 performs logic operations on the input adjacent two groups of information bits, and outputs the selected baseband signal numbers g...

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Abstract

The invention provides a quaternary continuous phase modulation-demodulation method which can increase the effective utilization rate of a spectrum, reduce signal coherent demodulation calculation and decrease complexity of a receiver. The technical scheme includes that in signal modulation, at an input end of a multi-system continuous phase modulation signal transmission system, a signal selection logic module performs combined logic operation according to front and rear adjacent input bit messages every time, two bit messages are mapped into absolute phase values of a certain determined position for transmitting modulation signals by a baseband signal collection module, baseband signals are modulated on carrier waves by transmitting the absolute phase values to an I modulation module and a Q modulation module, radio-frequency signals wirelessly received by an antenna are converted into the baseband signals by the aid of a quadrature demodulation module, the baseband signals are inputted to a baseband signal synchronization module, a symbol demodulation module takes amplitude values of real portions and imaginary portions of baseband complex signals at the synchronization position as bipolar numerical values of the two bit messages carried by a symbol, and the signals are demodulated by an information conversion module according to bipolar information conversion rules.

Description

technical field [0001] The invention relates to a modulation method and a demodulation method for continuous phase modulation applied in a high-speed frequency hopping system in the field of mobile communication, in particular to a method for modulation and demodulation of a wireless communication baseband signal. Background technique [0002] In the field of mobile communications, limited available spectrum resources and complex wireless transmission environment are two major constraints in the field of wireless communications. The requirements of these communication systems for modulated signals are high spectral characteristics, high receiving sensitivity, and nonlinear power amplifiers can be used to transmit modulated signals. With the widespread use of wireless communication systems, the transmission rate and distance of communication systems continue to increase, and the challenges faced by communication systems are concentrated in two aspects: on the one hand, the ba...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/18
Inventor 张剑周兴建卢建川
Owner 10TH RES INST OF CETC
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