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Transmission method and device for downlink multi-user multiple input multiple output (MIMO) signal

A signal transmission and multi-user technology, applied in space transmit diversity, diversity/multi-antenna system, preventing/detecting errors through diversity reception, etc., can solve problems such as not considering power imbalance, wasting power, increasing interference, etc. Achieve the effect of saving transmission power, improving throughput, and reducing interference

Active Publication Date: 2013-02-13
CHINA TELECOM CORP LTD
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Problems solved by technology

This precoding codebook design does not take into account the characteristics of power imbalance when indoor users receive multiple antenna ports of the base station, which wastes power and increases interference

Method used

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  • Transmission method and device for downlink multi-user multiple input multiple output (MIMO) signal
  • Transmission method and device for downlink multi-user multiple input multiple output (MIMO) signal
  • Transmission method and device for downlink multi-user multiple input multiple output (MIMO) signal

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Embodiment Construction

[0023] In order to solve the defects in the prior art, the present invention proposes a downlink multi-user MIMO signal transmission method and device suitable for FDD-LTE indoor distribution system. In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0024] figure 1 It is a schematic diagram of the mapping relationship between RRU (Remote RF Unit, remote radio frequency unit) ports and antenna groups in the FDD-LTE indoor distribution system of the present invention. Considering that the number of RRU ports P is greater than the number of channels per floor M, and P is greater than or equal to the number of user receiving antennas N, in order to fully utilize the MIMO spatial multiplexing gain, the RRU ports are divided into P / M antenna groups. Each antenna group corresponds to a certain floor, and diffe...

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Abstract

The invention discloses a method for transmitting a downlink multi-user multiple input multiple output (MIMO) signal and a base station. The method comprises the following steps of: dividing remote radio frequency unit (RRU) ports into P / M antenna groups, and storing corresponding relationships between the antenna groups and the ports; judging channels with users, and finding antenna groups corresponding to the channels; receiving pre-coding matrixes fed back from the users, selecting users in different antenna groups, and performing downlink multi-user MIMO transmission; informing the users of the antenna groups and the pre-coding matrixes for downlink data transmission, wherein the pre-coding matrixes are selected from a codebook set with a port number M by the users; and weighting data according to the pre-coding matrixes, outputting the weighted data to the users at antenna ports of the users, and not transmitting the data of the users by using the other ports. Useful signal transmission power is improved, interference is reduced, and indoor cell throughput is improved.

Description

technical field [0001] The invention belongs to the field of wireless mobile communication, and in particular relates to a downlink multi-user MIMO signal transmission method and device suitable for an FDD-LTE indoor distribution system. Background technique [0002] MIMO (Multiple Input Multiple Output) technology uses the independence of multipath fading between antennas to realize parallel transmission of multiple signals by configuring multiple antennas at the transmitting end and receiving end, without increasing the system bandwidth and transmitting power. It can improve channel capacity, and can also be used to improve channel reliability and reduce bit error rate. Therefore, LTE regards MIMO as one of the necessary technologies. [0003] Most of the high-speed data services in LTE occur indoors. Therefore, how to ensure good indoor coverage, take advantage of MIMO, and improve cell throughput is a key issue that operators need to solve when constructing LTE networks...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/06H04L1/06
Inventor 鲁娜朱雪田
Owner CHINA TELECOM CORP LTD
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