Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Method for suppressing residual multi-user interference in two-dimensional block spread spectrum system based on maximum likelihood detection

A technology of maximum likelihood detection and multi-user interference, applied in the field of communication, can solve the problem of residual multi-user interference in two-dimensional block spread spectrum system, so as to improve residual multi-user interference, optimize transmission performance, and suppress residual multi-user interference. effect of the signal

Inactive Publication Date: 2013-06-05
HARBIN INST OF TECH
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problem of residual multi-user interference in the two-dimensional block spread spectrum system of fast fading channels, and provides a method for suppressing residual multi-user interference in the two-dimensional block spread spectrum system based on maximum likelihood detection

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for suppressing residual multi-user interference in two-dimensional block spread spectrum system based on maximum likelihood detection
  • Method for suppressing residual multi-user interference in two-dimensional block spread spectrum system based on maximum likelihood detection
  • Method for suppressing residual multi-user interference in two-dimensional block spread spectrum system based on maximum likelihood detection

Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach 1

[0042] Specific implementation mode one: the following combination image 3 Describe this embodiment, this embodiment is based on the residual multi-user interference suppression method in the two-dimensional block spread spectrum system of maximum likelihood detection, under the SC-CDMA system:

[0043] Launch process:

[0044] Step 1, respectively performing chip-level spread spectrum on the U-channel modulated signal to obtain the signal after U-channel chip-level spread spectrum;

[0045] Step 2, carry out block spread spectrum respectively to the signal after U chip-level spread spectrum obtained in step 1, obtain the signal after U block spread spectrum;

[0046] Step 3, adding the U-channel block-spread signals obtained in step 2 into guard interval processing respectively, obtaining the processed U-channel signal, and transmitting to the channel through the transmitting antenna;

[0047] Receiving process:

[0048] Step 4, using the receiving antenna to connect the ...

specific Embodiment approach 2

[0056] Specific implementation mode two: the following combination Figure 4 to Figure 6 Describe this embodiment, this embodiment is based on the residual multi-user interference suppression method in the two-dimensional block spread spectrum system of maximum likelihood detection, under the MC-CDMA system:

[0057] Launch process:

[0058] Step 1, respectively performing chip-level spread spectrum on the U-channel modulated signal to obtain the signal after U-channel chip-level spread spectrum;

[0059] Step 2, performing inverse fast Fourier transform on the U-channel chip-level spread-spectrum signal obtained in step 1, respectively, to obtain the time-domain signal after the U-channel transform;

[0060]Step 3, performing block spread spectrum respectively on the time-domain signal after U channel transformation obtained in step 2, to obtain the signal after U channel block spread spectrum;

[0061] Step 4, add the U-channel block-spread signals obtained in step 3 to gu...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a method for suppressing residual multi-user interference in a two-dimensional block spread spectrum system based on maximum likelihood detection, which belongs to the field of telecommunication, and aims to solve the problem of the residual multi-user interference in the two-dimensional block spread spectrum system of a fast fading channel. The method of the invention aims at the fast fading channel, compared with the traditional slow fading channel, the process of maximum likelihood detection is added when receiving signals, and the maximum likelihood detection is used for transforming the received signals to frequency domains by FFT, then finding the frequency domain expressions (namely, the frequency domain expressions of original signals subjected to chip-level spread spectrum) of a group of sending signals which minimize a target function through the optimal search of the maximum likelihood detection algorithm so as to achieve the purpose of multi-use direction, wherein the means of the optimal search comprises a universal search, a search based on genetic algorithm and a search based on simulated annealing algorithm. The method of the invention has agood error rate performance, and can significantly improve the situation that the residual multi-user interference produced by constants can not be kept in continuous masses due to channel gains.

Description

technical field [0001] The invention relates to a method for suppressing residual multi-user interference in a two-dimensional block spread spectrum system based on maximum likelihood detection, and belongs to the field of communication. Background technique [0002] For the uplink (Uplink, UL) system of the wireless mobile communication system, multiple users often access the same base station (BS) at the same time, but because the location of each user is different, the time for each user to reach the base station is different In the same way, although different orthogonal spreading codes can be used to distinguish users in a CDMA system, due to the asynchronous uplink and channel delay spread, users will not be able to maintain orthogonality with each other, so serious multiple User Access Interference (MAI). MAI will seriously degrade the transmission performance of the uplink. How to adopt appropriate technology to avoid MAI has always been one of the focuses of schol...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): H04B1/711
Inventor 于启月孟维晓刘博
Owner HARBIN INST OF TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com