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Synchronous control method and device based on channel evaluation in CDMA communication system

A technology of channel estimation and synchronous control, which is applied in the field of synchronous control based on channel estimation, which can solve the problems of decreased synchronous control performance, increased error, and impact on the signal-to-interference-noise ratio of received data, and achieves the effect of improving accuracy

Active Publication Date: 2007-05-09
DATANG MOBILE COMM EQUIP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In this way, if the sampling point deviates from the output peak value of the root-raised cosine filter, it will significantly affect the signal-to-interference-noise ratio of the received data, so that the error of channel estimation using the training sequence will increase, resulting in a decrease in synchronization control performance

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  • Synchronous control method and device based on channel evaluation in CDMA communication system
  • Synchronous control method and device based on channel evaluation in CDMA communication system
  • Synchronous control method and device based on channel evaluation in CDMA communication system

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Embodiment Construction

[0044] As shown in Figure 1, the device for synchronous control in the embodiment of the present invention includes: a data receiving unit 101, a sampling unit 102, an analog-to-digital conversion unit 103, a data and training sequence separation unit 104, a local basic training sequence generation unit 105, a channel estimation unit 106 , estimated value-power conversion unit 107 , first data detection unit 108 , interpolation unit 109 , second data detection unit 110 and synchronization control command word generation unit 111 . in:

[0045] The data receiving unit 101 includes an amplification subunit 1011, a filtering subunit 1012, and a frequency downconversion subunit 1013, which are respectively used to amplify, filter and downconvert the wireless signal received by the antenna, and then transmit it to the sampling unit 102;

[0046] The sampling unit 102 samples the data output by the data receiving unit 101, and can select a sampling rate according to requirements to ...

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Abstract

This invention discloses a synchronous control method based on channel estimation in CDMA communication system and a device. Radio signals are processed by a data receive unit carry out multiple sample on a relevant module, modulus con-version to output data and separation of data and train sequence. The channel estimation unit gets the estimation result of multiple sample channel impulse response according to the train sequence of multiple sample and a basic train sequence to be converted into corresponding power sequence. The data detection unit detects the start, finish and peak position of the impulse response power sequence and the synchronous control order word generation unit determines the synchronous control word of the current subframe of the said user to be sent to the user for regulating signal emit time delay and regulate the target value of peak position according to rules.

Description

technical field [0001] The invention relates to a method and device for synchronous control of a wireless communication system, in particular to a method and device for synchronous control based on channel estimation in a code division multiple access communication system. Background technique [0002] In the uplink of a synchronous CDMA (Code Division Multiple Access, Code Division Multiple Access) communication system, multiple UEs (User Equipment, user terminals) send signals to the base station (Node B), in order to prevent mutual interference between different user signals Interference requires synchronous detection and control of each user to ensure that they arrive at the base station at the same time. [0003] In a synchronous CDMA communication system, synchronization control is aimed at uplink synchronization, and the precision of synchronization control is k / 8 chips (chip), k=1, 2, 4, 8. [0004] The main purpose of uplink synchronization control includes: to ens...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B7/26
Inventor 秦洪峰耿鹏曾召华
Owner DATANG MOBILE COMM EQUIP CO LTD