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Method and apparatus for phase reference tracking of digital phase modulated signals in the receiver

A technology of reference phase and receiver, applied in the direction of digital transmission system, carrier adjustment, modulation carrier system, etc.

Active Publication Date: 2011-08-31
MICROCHIP TECH INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Also, double errors (decoded symbol mistransmission) cannot be avoided in the present invention due to the proposed differential decoding

Method used

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  • Method and apparatus for phase reference tracking of digital phase modulated signals in the receiver
  • Method and apparatus for phase reference tracking of digital phase modulated signals in the receiver
  • Method and apparatus for phase reference tracking of digital phase modulated signals in the receiver

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Embodiment Construction

[0025] The drawings and the following detailed description are preferred embodiments of the present invention. It should be understood that the following disclosed descriptions will serve as embodiments of the present invention, and that the present invention is not limited to the drawings and specific specific embodiments.

[0026] Reference phase tracking is not necessary for some phase modulation signals, such as Gaussian frequency shift keying (GFSK) and differential phase shift keying (DPSK). However, known coherent detection may increase the performance of the receiver to 3 decibels. Here, a simple, stable and universal method for reference phase tracking in the phase domain is provided.

[0027] To understand the spirit of the present invention, refer to figure 1 , Which shows a block diagram of a general decoder and the reference phase tracking of the present invention. The reference phase tracking method for the digital phase modulation signal in the receiver 100 includ...

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Abstract

The present invention discloses a method and apparatus to provide, effectively and robustly, a phase reference in phase-domain for digital phase-modulated signals. Not only the first-order but also higher order PLLs are delineated for robust and fast tracking of frequency errors and time-varying frequency errors between the transmitter and the receiver. This invention can be applied to any phase-modulated signal such as PSK, DPSK, [pi] / 4-DPSK, and CPM. The decoders with this invention can achieve close to the performance of coherent detection.

Description

Technical field [0001] The invention relates to a digital communication system, in particular to a reference phase tracking method and device for a digital phase modulation signal in a receiver. Background technique [0002] Digital phase modulation has become a kind of general digital modulation because of its simplicity and stability. The source information can be transmitted by selecting the signal phase according to the information bit. Examples of digital phase modulation include continuous phase modulation (CPM), phase shift keying (PSK), and differential phase shift keying (DPSK). [0003] In the receiver, an accurate reference phase must be detected to decode the transmitted information bits. Otherwise, the reference phase error may cause severe performance degradation. For differentially coded digital phase modulators (such as DPSK, DQPSK, and D8PSK), a reference phase can be derived from previous symbols to facilitate demodulation. For simple receivers, DPSK signals c...

Claims

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Application Information

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IPC IPC(8): H04L27/233
CPCH04L27/0014H04L2027/0061H04L27/2277H04L2027/0067H04L2027/0032
Inventor 金判燮陈政宏刘欣痒
Owner MICROCHIP TECH INC
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