Time division multiplexing continuous phase direct carrier modulation and demodulation method

A technology of carrier modulation and demodulation method, applied in the direction of phase modulation carrier system, modulated carrier system, digital transmission system, etc., can solve the problems of increased interference, discontinuous phase modulation scheme, etc., and achieve safe and reliable navigation and information transmission, Easy signal tracking and demodulation, tight spectrum and anti-multipath and radio frequency interference effects

Active Publication Date: 2016-06-08
SOUTHEAST UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] It is noted that both BPSK and BOC use a discontinuous phase modulation scheme in the signal modulation process, that is, there is a 0 or 180 phase jump,

Method used

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  • Time division multiplexing continuous phase direct carrier modulation and demodulation method
  • Time division multiplexing continuous phase direct carrier modulation and demodulation method
  • Time division multiplexing continuous phase direct carrier modulation and demodulation method

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Embodiment 1

[0033] The invention provides a time division multiplexing continuous phase direct carrier modulation and demodulation method, the method comprising:

[0034] Step 1, Continuous Phase Direct Carrier Modulation Based on Time Division Structure

[0035] In this step, the data bits are modulated in the first half period of a basic carrier, and the ranging code is modulated in the second half period. The two kinds of information share a carrier period in time division. The continuous phase modulation method is specifically:

[0036] sin ( x + Δ b b sin x ) , 0 ...

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Abstract

The invention discloses a time division multiplexing continuous phase direct carrier modulation and demodulation method. The modulation of the method is based on time division structured continuous phase direct carrier modulation. Data bits are modulated at the first half cycle of a basic carrier; ranging codes are modulated at the second half cycle; two kinds of information time divisions share one carrier cycle; data demodulation and ranging comprise steps of peeling off carriers; tracking and compensating carrier dynamic states, comprising frequency offsets imported by RF carriers before down-conversion; demodulating additional phases; carrying out binary data demodulation; tracking pseudo-random codes through related integration and low-pass filtering, thus realizing compensation of ranging and signal dynamic states. According to the method provided by the invention, the direct carrier continuous phase modulation concept is applied in designing ranging and communication signal waveform sets; secure and reliable navigation and information transmission in a dynamic application environment can be realized; moreover, the frequency spectrum is compressed; the multipath and radio frequency interferences are prevented; and signal tracking and demodulation are easy to be realized.

Description

technical field [0001] The invention belongs to the technical field of ranging and communication of a navigation system, and in particular relates to a time-division multiplexing continuous phase direct carrier modulation and demodulation method. Background technique [0002] With the deployment of various wireless facilities and the use of equipment, the wireless spectrum in the air is becoming more and more crowded, wireless resources are becoming more and more scarce, and the harm to the system is also greater. At the same time, with the improvement of informatization, various wireless transmission devices face the challenges of high speed and high spectral efficiency. [0003] From the perspective of the simplest binary modulation of a digital communication system, two different waveforms of limited duration can be used to represent "0" and "1" information bits respectively, and generally encoded in advance to ensure that the two information bits, etc. probability to ap...

Claims

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Application Information

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IPC IPC(8): H04L27/20H04L27/22
CPCH04L27/2003H04L27/22
Inventor 何峰何善宝
Owner SOUTHEAST UNIV
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