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A Separation Method of Communication Transmitter Nonlinearity and Wireless Channel

A wireless channel and separation method technology, applied in channel estimation, transmission line coupling devices, baseband system components, etc., to achieve good application prospects and high accuracy.

Active Publication Date: 2019-06-21
上海海洋地质勘察设计有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In view of the deficiencies in the prior art above, the object of the present invention is to provide a method for separating transmitter nonlinearity and wireless channel in OFDM communication, aiming at solving the problem of joint estimation of transmitter nonlinearity and wireless channel parameters in the prior art. separation problem

Method used

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  • A Separation Method of Communication Transmitter Nonlinearity and Wireless Channel
  • A Separation Method of Communication Transmitter Nonlinearity and Wireless Channel
  • A Separation Method of Communication Transmitter Nonlinearity and Wireless Channel

Examples

Experimental program
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Effect test

Embodiment 1

[0093] Wherein, P=7 and M=0 of the nonlinear model of the transmitter (at this time, the transmitter satisfies the memoryless nonlinear model); LS estimation is used.

[0094] Only odd terms of the transmitter nonlinear coefficients are taken. When SNR=30dB, headers=16, the real and estimated values ​​of the PA model coefficients are shown in the following table:

[0095]

[0096]

[0097] The real and estimated values ​​of the corresponding wireless channel impulse response are shown in the following table:

[0098] channel actual value estimated value h(0) 0.7 0.6992-0.005i h(1) 03 0.299-0.0002i h(2) 0.1 0.099-0.0001i

[0099] Comparing the above tables, it can be seen that the nonlinear model coefficients of the transmitter and the unit impulse response of the wireless channel impulse response are well separated.

Embodiment 2

[0101] Wherein, M=1 of the transmitter nonlinear model, P=3 (at this moment, the transmitter is a memory model), and its actual MP model is:

[0102]

[0103] Only the odd-numbered items of the nonlinear coefficient of the transmitter are taken, and the length of the frame training sequence is 10 headers respectively, and the LMS estimation is used.

[0104] Using the LMS estimation method, when the SNR is 30, the PA nonlinear model coefficients of the transmitters of the two communication individuals are shown in the following table:

[0105]

[0106] The wireless channel is a Rayleigh two-path fading channel, and the unit impulse response is shown in the following table:

[0107]

[0108] Only consider the transmitter nonlinear model coefficient b 3，0 The estimated real part of and wireless channel impulse response h 0 The estimated real part of According to the above results, when the signal-to-noise ratio (SNR) is 30dB, the two components are better separate...

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Abstract

The invention provides a nonlinear and wireless channel separation method for transmitter in OFDM communication. The method includes the steps that OFDM radio-frequency signals are received, and received base band digital signals are obtained after sampling; a first element responding to a wireless channel pulse response is initialized; a preset iteration algorithm is executed on each communication frame; the iteration algorithm is conducted to the last communication frame, and accordingly a corresponding transmitter nonlinear model coefficient and a wireless channel unit pulse response estimation result are obtained; the preset iteration algorithm includes the steps that the nonlinear model coefficient of the transmitter and kronecker product estimation of the wireless channel unit pulse response are obtained, and estimation of the nonlinear model coefficient of the transmitter of a current communication frame and estimation of the wireless channel unit pulse response are separated from kronecker product estimation. The method has a good separation effect and can be applied to wireless channel balance, nonlinear compensation and other fields of OFDM communication.

Description

technical field [0001] The invention relates to the technical field of wireless communication, in particular to a method for separating the non-linearity of a transmitter and a wireless channel in OFDM communication. Background technique [0002] Due to its advantages of high bandwidth efficiency, high transmission capacity and resistance to multipath fading, Orthogonal Frequency Division Multiplexing (OFDM) technology has been widely used in Digital Audio Broadcasting (DAB), Digital Video Broadcasting (DVB), Digital Subscriber Line (DSL) ) and wireless LAN (IEEE 802.22) in the TV band and the physical layer transmission of the fifth generation (5G) mobile communication. [0003] In OFDM systems, channel estimation plays a very important role in interference suppression, coherent detection and decoding. The general OFDM channel estimation technology approximates the transmitter part of the wireless device as a linear system; however, due to the existence of devices such as ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L25/02H04L27/26
CPCH04L25/0212H04L25/0242H04L25/025H04L25/0256H04L25/028H04L27/2626
Inventor 袁红林
Owner 上海海洋地质勘察设计有限公司