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A Channel Estimation Method for td-scdma System

A TD-SCDMA and channel estimation technology, which is applied to baseband system components and other directions, can solve problems such as high computational complexity, large error in channel estimation results, and impact on system performance, and achieve the effect of improving performance

Inactive Publication Date: 2016-08-03
TIANJIN UNIVERSITY OF TECHNOLOGY
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Problems solved by technology

[0015] Among the channel estimation techniques currently used in TD-SCDMA systems, the channel estimation algorithms using interpolation algorithms, interference cancellation techniques, and multiple cyclic iteration techniques have a high amount of computation, and are not suitable for applications that require high real-time performance and high-speed mobile terminals. In this situation, although the existing threshold processing method has a low computational load, it can only remove part of the noise paths, and the remaining paths still contain additive noise, resulting in large errors in channel estimation results and affecting system performance.

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  • A Channel Estimation Method for td-scdma System
  • A Channel Estimation Method for td-scdma System
  • A Channel Estimation Method for td-scdma System

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Embodiment Construction

[0036] The present invention will be further described below in conjunction with accompanying drawing and specific embodiment:

[0037] figure 1 It is a typical prior art receiver block diagram used by the receiving end in the TD-SCDMA system, and the receiving front end starts from the received time slot (such as figure 2 As shown), the midamble code and the data block are obtained and sent to the channel estimator and the data demodulation device respectively; the channel estimator uses the midamble code to perform channel estimation to obtain the channel estimation result and sends it to the data demodulation device; the data demodulation device uses the channel The estimated result performs joint detection, descrambling, despreading, and demodulation on the data block to restore user data.

[0038] The midamble code received by the receiving front end can be expressed as e m , due to the influence of delay when receiving, e m The first W-1 bits of the previous data blo...

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Abstract

The invention discloses a channel estimation method for a TD-SCDMA system. The method comprises the following steps: performing channel response estimation on the signal received by the TD-SCDMA system to obtain a preliminary estimation result, namely, obtaining the preliminary channel response estimation value of each channel; calculating the power of each channel; setting a threshold value according to the power of each channel; comparing the threshold value with the power of each channel and modifying the preliminary channel response estimation value of each channel, obtaining the channel response estimation value of each channel to realize the channel value of the TD-SCDMA system. According to the channel estimation method, the problem of the existence of noise in the existing channel estimation method can be solved, and the performance of the channel estimation is improved.

Description

technical field [0001] The invention relates to channel estimation technology, in particular to a channel estimation method in TD-SCDMA system. Background technique [0002] A series of key technologies such as joint detection, smart antenna, and uplink synchronization in TD-SCDMA system all rely on fast and accurate channel estimation. Therefore, good channel estimation technology is a necessary condition for determining the performance of TD-SCDMA system. figure 2 is a time slot structure diagram in TD-SCDMA system, in which midamble code (training sequence) is used for channel estimation. In the same cell, the system determines a basic midamble code, and different users in the cell use the cyclic shift of the basic midamble code as their respective training sequences for channel estimation. [0003] The TD-SCDMA system uses the B.Steiner estimator for channel estimation, and uses the cyclic shift characteristics of midamble codes to replace complex matrix inversion opera...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L25/02
Inventor 孟庆松马秀荣姜凯白媛赵德香程云翔
Owner TIANJIN UNIVERSITY OF TECHNOLOGY
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