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Adaptive space time closed-loop transmitting diversity method and its system

A closed-loop transmission and self-adaptive technology, applied in space transmission diversity, diversity/multi-antenna systems, code division multiplexing systems, etc., can solve problems such as wireless channel adjustment and performance loss

Inactive Publication Date: 2009-01-21
HUAWEI TECH CO LTD
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Problems solved by technology

In the existing CDMA standard, the four-antenna transmit diversity mainly includes the open-loop space-time transmit diversity method (Open-loop STTD). In this transmit diversity method, due to the lack of information on the current wireless channel, two sets of transmit antennas are always Transmitting in the mode of equal power cannot adaptively adjust the time-varying wireless channel, so there is a certain performance loss

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  • Adaptive space time closed-loop transmitting diversity method and its system
  • Adaptive space time closed-loop transmitting diversity method and its system
  • Adaptive space time closed-loop transmitting diversity method and its system

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Embodiment Construction

[0035] The specific implementation of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0036] figure 1 Shown is the adaptive space-time closed-loop transmit diversity scheme of the present invention. First, the symbols to be transmitted are space-time encoded by the space-time encoding module 101 according to the following rules, and the input symbols are encoded according to every 2 symbols (S 1 , S 2 ) encodes the unit block, and outputs two signals: one path remains the same as the input block (S 1 , S 2 ), the other way is the reverse order of the input conjugate, and the first output sign is reversed, that is, the output (-S 2 * , S 1 * ). The two outputs are respectively amplified and sent to two sets of antennas, wherein the antennas Aa and Ab form the first set of antennas, and the antennas Ac and Ad form the second set of antennas. The amplification factor and according to the existing standard are both ...

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Abstract

The present invention discloses a method and system for adaptive space-time closed-loop transmit diversity. In each time slot, the symbols to be transmitted make space-time coding and output two signals; sending to two groups of antennas after amplifying the signals, respectively, and sending the two signals to a mobile terminal, then the mobile terminal estimates the each-path signals from each antenna, and computing the power of the first group antenna and the second group antenna and comparing them so as to obtain FBI bits, and transmitting them to the base station over uplink channel, then the base station will storage the FBI bits In the delay line; retrieving power ratio from the FBI bits. In the delay line; computing the weighting of transmit power of the first group antenna and the second group antenna according to the power ratio, and adjusting the transmit power of the two antennas. The disclose of the present Invention may adjust the transmit power of the two groups of transmit antennas adaptively, and having more diversity gain comparing with open-loop way.

Description

technical field [0001] The present invention relates to a space-time transmission diversity technology, in particular to a space-time transmission diversity method and a device thereof which adjust signal transmission power in an adaptive manner in real time. Background technique [0002] In the third generation (3G, Third Generation) mobile communication system Wideband CDMA (WCDMA, Wideband CDMA) standard based on Code Division Multiple Access (CDMA), due to different users in the same cell and adjacent cells Different users share the same frequency band at the same time, so there is interference between users, which limits the system capacity and information transmission rate. In order to improve system capacity, can adopt many kinds of diversity methods, such as multipath diversity, space diversity and antenna diversity and other technologies. In a system using diversity technology, there are multiple independent copies of the same information content in different forms...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04J13/00H04Q7/20H04B7/02H04B7/06
CPCH04B7/0673H04B7/0634H04B7/0669
Inventor 曹爱军波瑞尼斯勒M坡波维克马蒂斯·温斯特姆
Owner HUAWEI TECH CO LTD
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