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Phase noise estimation method

A phase noise and channel estimation technology, which is applied to the shaping network and baseband system components in the transmitter/receiver, can solve the problems of increased bit error rate, reduce the bit error rate, improve reliability, The effect of compensating phase noise

Inactive Publication Date: 2014-04-23
UNIV OF ELECTRONIC 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

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specific Embodiment approach

[0023] S1. Realize channel estimation by using a channel estimation sequence, including:

[0024] S11. The channel estimation sequence is a sequence composed of some known symbols. For example, the single-carrier channel estimation sequence in the 802.11.ad standard is [-Gb 128 ,-Ga 128 ,Gb 128 ,-Ga 128 ,-Gb 128 , Ga 128 ,-Gb 128 ,-Ga 128 ,-Gb 128 ], while the channel estimation sequence of OFDM system is [-Gb 128 , Ga 128 ,-Gb 128 ,-Ga 128 ,-Gb 128 ,-Ga 128 ,Gb 128 ,-Ga 128 ,-Gb 128 ], where Ga 128 and Gb 128 is a Gray sequence.

[0025] S12. At the receiving end, we can obtain the signal in the time domain expressed as a matrix: 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, which is affected by phase noise and white Gaussian noise. A N×N is an N×N diagonal matrix composed of phase noise, h N×N is the Toeplitz matrix composed of the equivalent time-domain channel impulse response, x N×1 is an N×1 column vecto...

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Abstract

The invention belongs to the technical field of wireless communication, and particularly relates to a method for realizing the phase noise estimation by an iteration method in a wireless communication system. According to the method, firstly, the equivalent discrete time domain channel impulse response is estimated through channel estimation sequences, then, a CPE (common phase error) of the phase noise is estimated through interpolation, and finally, the phase noise estimation is realized by the iteration method, so the phase noise is compensated, the reliability of the system is improved, and the bit error rate is reduced.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and in particular relates to realizing phase noise estimation through an iterative method 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 ...

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Application Information

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IPC IPC(8): H04L25/02H04L25/03
Inventor 袁波成先涛
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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