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Method for suppressing residual multi-user interference in 2-dimensional block spread system based on 2-dimensional minimum mean square error detection algorithm

A minimum mean square error, multi-user interference technology, applied in the field of communication, can solve the problem of residual multi-user interference in two-dimensional block spread spectrum system, and achieve the effect of improving residual multi-user interference and moderate complexity

Inactive Publication Date: 2011-01-12
HARBIN INST OF TECH
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  • Application Information

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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 the fast fading channel, and provides a residual multi-user interference suppression method in the two-dimensional block spread spectrum system based on the two-dimensional minimum mean square error detection algorithm

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  • Method for suppressing residual multi-user interference in 2-dimensional block spread system based on 2-dimensional minimum mean square error detection algorithm
  • Method for suppressing residual multi-user interference in 2-dimensional block spread system based on 2-dimensional minimum mean square error detection algorithm
  • Method for suppressing residual multi-user interference in 2-dimensional block spread system based on 2-dimensional minimum mean square error detection algorithm

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specific Embodiment approach 1

[0041] Specific implementation mode one: the following combination image 3 Describe this implementation mode, this implementation mode is based on the residual multi-user interference suppression method in the two-dimensional block spread spectrum system of the two-dimensional minimum mean square error detection algorithm, under the SC-CDMA system:

[0042] Launch process:

[0043] 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;

[0044] 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;

[0045] 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;

[0046] Receiving process:

[00...

specific Embodiment approach 2

[0055] Specific implementation mode two: the following combination Figure 4 to Figure 6 Describe this implementation mode, this implementation mode is based on the residual multi-user interference suppression method in the two-dimensional block spread spectrum system of the two-dimensional minimum mean square error detection algorithm, under the MC-CDMA system:

[0056] Launch process:

[0057] Step 1. Carry out chip-level spreading and interleaving of U-channel modulated signals respectively, to obtain signals after U-channel chip-level spreading;

[0058]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;

[0059] 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;

[0060] Step 4, add the U...

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Abstract

A method for suppressing residual multi-user interference in a 2-dimensional block spread system based on 2-dimensional minimum mean square error (2D MMSE) detection algorithm belongs to the field of communications and aims to solve the problem of residual multi-user interference in the 2-dimensional block spread system in a fast fading channel. The invention aims at the fast fading channel, compared with the traditional slow fading channel, the 2D MMSE detection link is added during receiving the signal. After being transformed to the frequency domain through fast Fourier transform (FFT), the signal received by a receiver is subjected to 2D MMSE detection. The weight of the signal in the frequency domain is changed and is more reasonable. Multi-user detection and frequency domain equalization can be completed through 2D MMSE detection to resist the impact of multipath fading channels. The detection algorithm has low implementation complexity and good bit error rate performance and can well improve the residual multi-user interference generated because the channel gain can not maintain constant in the continuous blocks.

Description

technical field [0001] The invention relates to a residual multi-user interference suppression method in a two-dimensional block spread spectrum system based on a two-dimensional minimum mean square error detection algorithm, belonging to the communication field. 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 o...

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Application Information

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IPC IPC(8): H04B1/707
Inventor 于启月孟维晓张娜
Owner HARBIN INST OF TECH