Constant modular complete blind detection equalizing method for phase modulation signal

A technology of phase modulation and equalization method, which is applied in the direction of phase modulation carrier system, shaping network in transmitter/receiver, baseband system components, etc. It can solve problems such as failure, eliminate errors, ensure uniqueness, and eliminate phase offset effect

Inactive Publication Date: 2008-11-19
NANJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

However, the above two improvement schemes are based on the premise that the modulation method of the sending end is known. If the modulation method is unknown or the modulation method is changed without notifying the receiving end, the two improvement schemes will be invalid.

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  • Constant modular complete blind detection equalizing method for phase modulation signal
  • Constant modular complete blind detection equalizing method for phase modulation signal
  • Constant modular complete blind detection equalizing method for phase modulation signal

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Embodiment Construction

[0033] The improved constant modulus equalizer used in this scheme

[0034] The improved constant modulus equalizer used in this scheme includes two parts: 1) traditional constant modulus equalizer; 2) constellation diagram error penalty function. Its design criteria are as follows:

[0035] w = arg w min { E { ( | y k | 2 - R 2 ) 2 + β 1 si n 2 ( M 2 φ k ) } } - - ...

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Abstract

Disclosed is a phase modulation signal constant modulus full-blind detection equalization method which is a solution in the MPSK (multiple phase shift keying) modulation system that the receiver end adopts the CMA (constant modulus algorithm) to process the full-blind equalization; the full-blind detection equalization method mainly solves the problem that in the MPSK modulation system, the phase ambiguity exists in the signal which is equalized by the receiver end through the CMA; in the full-blind environment, the CMA is adopted to trace and detect the modulation mode of the MPSK. The full-blind detection equalization method extracts the difference phase information of the common constant modulus output signal and uses the trigonometric function relation to process self-adopting towards the detection phase modulation mode; meanwhile, the detected phase modulation mode is substituted in the improved constant modulus equalizer so that the common phase deviation problem in the blind equalization algorithm is further eliminated; with the aim of eliminating the error periodically caused by the trigonometric function, the full-blind detection equalization method adds restrictive conditions to the trigonometric function so that the uniqueness of the detection of the phase modulation mode is guaranteed.

Description

technical field [0001] The invention is a solution to the full-blind equalization by using CMA (constant modulus algorithm) at the receiving end in the MPSK (multiary phase-shift keying) modulation system. It is mainly used to solve the following problems: in the MPSK modulation system, the phase ambiguity of the signal after the receiver adopts CMA equalization; in a blind environment, use CMA to track and detect the modulation mode of MPSK. The invention belongs to the technical field of blind signal processing CMA equalization detection. Background technique [0002] In modern digital communication systems, due to the influence of many unfavorable factors such as multipath fading, Doppler frequency shift and channel fast time variation in the wireless channel environment, the transmission signals are superimposed before and after, resulting in intersymbol interference. As a key technology to resist intersymbol interference, channel equalization can be regarded as the app...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/03H04L27/22
Inventor 王欣酆广增
Owner NANJING UNIV OF POSTS & TELECOMM
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