Method for inhibiting residual multi-user interference in two-dimensional block spread spectrum system based on parallel interference cancellation and iterative detection

A multi-user interference and iterative detection technology, applied in the field of residual multi-user interference suppression, can solve problems such as interference and residual multi-user in two-dimensional block spread spectrum system, achieve good bit error rate (BER) performance, and improve residual multi-user interference effect

Inactive Publication Date: 2013-03-27
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • 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 fast fading channels, and provide a residual multi-user interference suppression method in the two-dimensional block spread spectrum system based on parallel interference cancellation and iterative detection

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  • Method for inhibiting residual multi-user interference in two-dimensional block spread spectrum system based on parallel interference cancellation and iterative detection
  • Method for inhibiting residual multi-user interference in two-dimensional block spread spectrum system based on parallel interference cancellation and iterative detection
  • Method for inhibiting residual multi-user interference in two-dimensional block spread spectrum system based on parallel interference cancellation and iterative detection

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specific Embodiment approach 1

[0074] Specific implementation mode one: the following combination Figure 4 This embodiment is described. This embodiment is based on the residual multi-user interference suppression method in the two-dimensional block spread spectrum system based on parallel interference cancellation and iterative detection. Under the SC-CDMA system:

[0075] Launch process:

[0076] 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;

[0077] 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;

[0078] 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;

[0079] Receiving process:

[0080] Step 4, us...

specific Embodiment approach 2

[0092] Specific implementation mode two: the following combination Figure 5 Describe this embodiment, this embodiment is based on the residual multi-user interference suppression method in the two-dimensional block spread spectrum system of parallel interference cancellation and iterative detection, under the MC-CDMA system:

[0093] Launch process:

[0094] Step 1. Carry out chip-level spreading and interleaving of U-channel modulated signals respectively, to obtain signals after U-channel chip-level spreading;

[0095] 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;

[0096] 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;

[0097] Step 4, add the U-channel block-spread signals obtain...

specific Embodiment approach 3

[0112] Specific implementation mode three: the following combination Figure 6 This embodiment is described. This embodiment is based on the residual multi-user interference suppression method in the two-dimensional block spread spectrum system based on parallel interference cancellation and iterative detection. Under the SC-CDMA system:

[0113] Launch process:

[0114] 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;

[0115] 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;

[0116] 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;

[0117] Receiving process:

[0118]Step 4, u...

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Abstract

The invention relates to a method for inhibiting residual multi-user interference in a two-dimensional block spread spectrum system based on parallel interference cancellation and iterative detection, which belongs to the field of communication and solves the problem of the residual multi-user interference in the two-dimensional block spread spectrum system of a quick fading channel. In the two-dimensional block spread spectrum system of the invention, the scheme of parallel interference cancellation with iterative detection is adopted for eliminating multi-user interference. Two schemes are arranged for setting an iterative initial value: in the first scheme, the iterative initial value is obtained by one-dimensional MMSE (Minimum Mean Square Error) frequency domain equalization; and in the second scheme, two-dimensional MMSE is adopted for changing the weight of frequency domain equalization; repeated iteration is carried out; data are not outputted until multi-user interference is small enough; after each path of signals are iterated, self multi-user interference signals of the modulated and outputted data are extracted; the scheme of parallel interference cancellation is obtained by subtracting multi-user interference signals of all other paths from the iterated value of each path of frequency domain equalization; and the residual multi-user interference is effectively eliminated through repeated iteration and parallel interference cancellation.

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 parallel interference cancellation and iterative detection, and belongs 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 ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B1/7107H04L25/02H04L25/03H04L27/26
Inventor 于启月孟维晓陈曦
Owner HARBIN INST OF TECH
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