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Hybrid carrier order selection method based on minimum mean square error equalization

A technology of minimum mean square error and mixed carrier, which is applied in the direction of equalizer, modulated carrier system, baseband system, etc., can solve the problems of high system bit error performance and difficult selection of transformation order of mixed carrier system, and achieve the goal of optimizing system performance Effect

Active Publication Date: 2017-08-08
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention is to solve the problem of high bit error performance of the system due to the difficulty in selecting the conversion order of the hybrid carrier system. The present invention provides a hybrid carrier order selection method based on minimum mean square error equalization

Method used

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  • Hybrid carrier order selection method based on minimum mean square error equalization
  • Hybrid carrier order selection method based on minimum mean square error equalization
  • Hybrid carrier order selection method based on minimum mean square error equalization

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specific Embodiment approach 1

[0032] Specific implementation mode one: the hybrid carrier order selection method based on minimum mean square error equalization described in this implementation mode, the method includes the following steps:

[0033] Step 1. Use the receiving antenna to receive the current data block signal y(i), and process the current data block signal y(i) to obtain the average power of the current data block signal

[0034] Among them, N is the length of the data block signal, and N is a positive integer, y(i) * Represents the conjugate of y(i), i is a variable;

[0035] Step 2. According to the noise power spectral density n 0 and system bandwidth B, calculate the noise power p z =n 0 B, where n 0 =-174dbm / Hz;

[0036] Step 3. According to the average power p of the current data block signal obtained in step 1 y and the noise power p obtained in step 2 z , to calculate the average power of useful signal p s , where p s =p y -p z ;

[0037] Step 4. Estimate the channel sta...

specific Embodiment approach 2

[0058] Specific embodiment 2: The difference between this embodiment and the hybrid carrier order selection method based on minimum mean square error equalization described in specific embodiment 1 is that the channel state information H described in step 4 tl The gain matrix expression of is:

[0059]

[0060] Among them, h n,l Represents the channel gain coefficient of the lth tap of the time-varying channel at the nth sampling moment, n∈[0,N-1], l∈[0,L-1].

specific Embodiment approach 3

[0061] Specific embodiment three: the difference between this embodiment and the mixed carrier order selection method based on minimum mean square error equalization described in specific embodiment one is that, in step five, the MMSE equalization method is used to analyze the channel state information H tl The specific process of processing and obtaining the balance matrix G is realized by using the following formula 2:

[0062]

[0063] Among them, I represents the identity matrix, means H tl The conjugate transposition of .

[0064] In this embodiment, the MMSE (Minimum Mean Square Error, minimum mean square error) equalization method described above can effectively suppress the noise amplification problem in the equalization process, and make the difference between the equalized signal and the original signal variance is minimized.

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Abstract

The invention relates to a hybrid carrier order selection method based on minimum mean square error equalization, used for solving the problem that the system error performance of a hybrid carrier system is high due to the fact that the conversion order is difficultly selected. The channel state information of a channel is obtained by adoption of a channel estimation method; the average power of useful signals and noise is calculated according to received signals; the power of interference suffered by per bit signal is calculated according to the obtained channel state information, the useful signal power and the noise power; the conversion order is changed; simultaneously, the interference power distribution variance in each conversion order is calculated by utilization of a minimum mean square error equalization formula and the channel state information; and all calculated variances are compared, wherein the conversion order corresponding to the minimum value is the optimal conversion order to be selected. The hybrid carrier order selection method disclosed by the invention is mainly used for carrier order selection.

Description

technical field [0001] The invention belongs to the field of wireless communication. Background technique [0002] With the advancement of science and technology, the channel environment of mobile communication has become more and more complex. Under the time-frequency dual-selection channel with simultaneous fading in the time domain and frequency domain, it is difficult for the traditional single-carrier system and multi-carrier system to obtain good results. However, the mixed carrier system system based on weighted fractional Fourier transform can achieve relatively good results in such a bad channel. For a mixed carrier system system, the quality of its bit error performance mainly depends on the selection of the transformation order, so a method for selecting the transformation order is urgently needed to select the optimal transformation order to further improve system performance. Contents of the invention [0003] The purpose of the present invention is to solve ...

Claims

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Application Information

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IPC IPC(8): H04L27/26H04L27/01H04L25/02H04B7/08
CPCH04B7/0854H04L25/0256H04L27/01H04L27/2628H04L27/2691Y02D30/70
Inventor 沙学军马聪梅林
Owner HARBIN INST OF TECH
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