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Improved estimation method of phase noise in wireless communication system

A wireless communication system, phase noise technology, applied in baseband system components, shaping networks in transmitters/receivers, etc., can solve problems such as increasing bit error rate, reduce bit error rate and improve reliability Effect

Inactive Publication Date: 2015-09-30
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

In OFDM system, phase noise will produce common phase error (CPE) and inter-carrier interference (ICI); Big

Method used

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  • Improved estimation method of phase noise in wireless communication system
  • Improved estimation method of phase noise in wireless communication system
  • Improved estimation method of phase noise in wireless communication system

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Embodiment Construction

[0021] The technical solution of the present invention will be described in detail below in combination with the embodiments and the accompanying drawings.

[0022] S1. Phase noise estimation initialization, specifically:

[0023] S11, expressing the time-domain signal obtained at the receiving end as a matrix form y N×1 =A N×N h N×N x N×1 +w N×1 , where y N×1 is in the form of an N×1 column vector, A N×N is an N×N diagonal matrix composed of phase noise, h N×N is the Toeplitz matrix formed by the equivalent time-domain channel impulse response, x N×1 An N×1 column vector composed of transmitted data, w N×1 is a noise vector of N×1, and N is a non-zero natural number;

[0024] S12. Using channel estimation to obtain the impulse response of the corresponding equivalent time-domain channel Add the special word (UW) to the data sequence to be transmitted to realize the removal of intersymbol interference;

[0025] S13. Estimate the ratio of the phase noise constant a(...

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Abstract

The invention belongs to the technical field of wireless communication, particularly relates to estimation of phase noise in a wireless communication system using a relevant algorithm, and provides a phase noise estimation method in the wireless communication system using the algorithm. According to the method, equivalent discrete time-domain channel impulse response is utilized to estimate CPE (common phase error) of the phase noise via an interpolation mode, and the phase noise is finally estimated by an iterative approach, thus system reliability is improved and error rate is reduced.

Description

technical field [0001] The invention relates to the technical field of wireless communication, in particular to realizing phase noise estimation through corresponding algorithms in a wireless communication system. Background technique [0002] Modern digital communication systems have corresponding frequency bands. The system needs to up-adjust the information sequence to the designated frequency band before sending it to the transmission medium, and the receiving end needs to down-convert the received signal to baseband for subsequent processing. Therefore, both the transmitting end and the receiving end need to generate corresponding carrier waves to complete corresponding up-conversion and down-conversion operations. However, the carrier is not ideal. Due to the stability of the crystal oscillator and the phase-locked loop that generate the carrier, there is a short-term random difference between the carrier frequency and the target frequency, which in turn causes the gen...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/03H04L25/02
Inventor 袁波成先涛罗增强付自刚
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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