Multi-user delivery scheme combining intelligent antenna technology in TD-SCDMA downlink chain circuit

A technology of TD-SCDMA and TDD-CDMA, which is applied in the field of multi-user transmission schemes, can solve problems such as performance limitations of multi-user transmission technology, achieve elimination of multiple access interference and intersymbol interference, reduce interference, and improve system performance Effect

Inactive Publication Date: 2006-10-11
BEIJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

[0004] Although multi-user transmission (MUT) technology has many advantages, in practical applications, the introduction of multi-antenna arrays and spatial angle information lim

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  • Multi-user delivery scheme combining intelligent antenna technology in TD-SCDMA downlink chain circuit
  • Multi-user delivery scheme combining intelligent antenna technology in TD-SCDMA downlink chain circuit
  • Multi-user delivery scheme combining intelligent antenna technology in TD-SCDMA downlink chain circuit

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Embodiment Construction

[0022] The scheme is described in detail below in conjunction with the accompanying drawings and specific examples, so as to further understand the principles, steps, characteristics and advantages of the scheme. In the accompanying drawings:

[0023] figure 1 It is a simplified base station structure diagram of the multi-user transmission scheme combined with smart antennas proposed by the present invention. The system is composed of a smart antenna array composed of K antennas, a multi-channel transceiver, a channel estimation unit, a downlink beam processing unit, and a downlink multi-user transmission unit, uplink adaptive processing unit, uplink joint detection and other units. The signal received by the smart antenna array is transformed into a digital baseband signal through a multi-channel transceiver. Then perform channel estimation and DOA estimation, and send the estimated results to the uplink adaptive processing unit, downlink beam processing unit and multi-user ...

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Abstract

The presented multiuser transmission scheme, which combines intelligent antenna technique and applied on down link of TD-SCDMA system, comprises: taking channel estimation to RF receiver sampling data of every antenna array element by known user train sequence to obtain all channel states and then the assignment weight values of down beam of intelligent antenna; finally, applying the multiuser transmission system for pre-balance according to former weight value and user channel state. This invention is practical to improve system performance.

Description

technical field [0001] The invention relates to the field of wireless communication, and is a multi-user transmission scheme combined with smart antenna technology applied to the downlink of a TD-SCDMA wireless communication system. Background technique [0002] Time Division Synchronous Code Division Multiple Access (TD-SCDMA) system is the third generation mobile communication system proposed by China based on Time Division Duplex (TDD) mode. In this system, multiple-access interference (Multiple-access Interference, MAI) and inter-symbol interference (Inter-symbol Interference, ISI) are the main factors that limit the system capacity. In current systems, Multiuser Detection (MUD) technology is often used to eliminate Multiple Access Interference (MAI) and Intersymbol Interference (ISI) at the receiving end, while another technology, Multiuser Transmission (MUT ) has recently begun to be noticed and studied by more and more people. Multi-user transmission technology is a...

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Application Information

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IPC IPC(8): H04B1/707H04L25/02H04L25/03H04B7/04
Inventor 蒋峥常永宇张欣杨大成
Owner BEIJING UNIV OF POSTS & TELECOMM
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