Terminal channel estimation method and terminal channel estimation system under multiple services of time division-synchronous code division multiple access (TD-SCDMA) system

A TD-SCDMA and channel estimation technology, applied in the field of wireless communication processing, can solve the problem that the signal cannot be demodulated correctly, and achieve the effect of improving the accuracy and improving the demodulation performance.

Active Publication Date: 2011-07-20
SANECHIPS TECH CO LTD
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Problems solved by technology

In the case of a large power difference between CCTRCHs, the threshold is set according to the energy peak value of the taps of the user, and the energy of each tap of the CCTRCH with a smaller power may be below the threshold. In this case, the channel estimation value is all zero. The CCTRCH signal with low power cannot be demodulated correctly

Method used

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  • Terminal channel estimation method and terminal channel estimation system under multiple services of time division-synchronous code division multiple access (TD-SCDMA) system
  • Terminal channel estimation method and terminal channel estimation system under multiple services of time division-synchronous code division multiple access (TD-SCDMA) system
  • Terminal channel estimation method and terminal channel estimation system under multiple services of time division-synchronous code division multiple access (TD-SCDMA) system

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Embodiment Construction

[0048]The basic idea of ​​the present invention is: obtain the relative size of each CCTRCH power; According to the relative size of each CCTRCH power, correct the tap energy of the channel estimation value, carry out the post-processing of channel estimation for the first time; The results of the second channel estimation are performed to obtain the final effective taps.

[0049] Specifically, the base station records the initial transmission power of each CCTRCH and the power control adjustment amount of the CCTRCH duration to obtain the relative power of each CCTRCH, and transmits it to the terminal in the form of signaling, and the terminal can carry it according to the previous frame signaling Each CCTRCH power information of the user corrects the corresponding tap power of each CCTRCH of the user to obtain the revised tap power power_revised, and then sets the threshold through the peak value of the revised tap to complete the post-processing of the first channel estimati...

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Abstract

The invention discloses a terminal channel estimation method under multiple services of a time division-synchronous code division multiple access (TD-SCDMA) system. The method comprises the following steps of: estimating an initial channel to obtain a channel estimation value; obtaining relative size of coded composite transport channel (CCTRCH) power; according to the relative size of each CCTRCH power, modifying the tap energy of the channel estimation value, and performing first channel estimation after-treatment; and according to the result of the first channel estimation after-treatment, performing second channel estimation after-treatment to obtain final effective taps. The invention further discloses a terminal channel estimation system under multiple services of the TD-SCDMA system; and based on the system and the method, the accuracy of the channel estimation is improved so as to improve the demodulation performance of the service with low power.

Description

technical field [0001] The invention relates to wireless communication processing technology, in particular to a terminal channel estimation method and system under multi-service parallel TD-SCDMA system. Background technique [0002] Time Division-Synchronous Code Division Multiple Access (TD-SCDMA) system is Time Division Multiple Access (Time Division Multiple Access, TDMA), Frequency Division Multiple Access (Frequency Division Multiple Access, FDMA) and code division multiple access (Code Division Multiple Access, CDMA) flexible combination of multiple transmission modes. Its main advantages are mainly reflected in the application of a variety of new technologies such as smart antennas, software radios, and joint detection. Among them, the joint detection is mainly used to demodulate user data, and the premise of the application of the joint detection algorithm is that the channel impulse response of each user can be accurately estimated. [0003] The channel estimati...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W52/04H04L25/02
CPCH04B1/712
Inventor 梁立宏
Owner SANECHIPS TECH CO LTD
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