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Open loop precoder cycling in mimo communications

A precoder and precoding technology, applied in multi-frequency code systems, transmission control/equalization, spatial transmit diversity, etc., can solve the problem of high implementation complexity of transmitters and receivers, increased power consumption, and undesired receivers. complexity, etc.

Active Publication Date: 2010-12-08
TELEFON AB LM ERICSSON (PUBL)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Another problem involves undesirable complexity in the receiver (e.g. UE)
The disadvantage of using many different precoders in the precoder loop is high implementation complexity (and thus increased power consumption) at the transmitter and receiver, since the precoder operation and receive filter operation have to be implemented and matched Each precoder used

Method used

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  • Open loop precoder cycling in mimo communications
  • Open loop precoder cycling in mimo communications
  • Open loop precoder cycling in mimo communications

Examples

Experimental program
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Embodiment Construction

[0049] For purposes of illustration and not limitation, specific details such as particular nodes, functional entities, techniques, protocols, standards, etc. are set forth in the following description in order to provide an understanding of the techniques. In other instances, detailed descriptions of well-known methods, devices, techniques, etc. are omitted so as not to obscure the understanding of this description with unnecessary detail. The individual functional blocks are shown in the figures. Those skilled in the art will appreciate that the functions of those blocks may be implemented using individual hardware circuits, using software programs and data in conjunction with a suitably programmed microprocessor or general purpose computer, using application specific integrated circuits (ASICs), programmable logic arrays, and / or using One or more digital signal processors (DSP) to achieve.

[0050] It will be apparent, however, to one skilled in the art that other embodime...

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PUM

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Abstract

Data is transmitted over multiple input multiple output (MIMO) channels. Plural bit streams are modulated into multiple data symbol vectors. Each vector has a transmission rank with one vector for each MIMO channel. Transmission rank is the number of elements in a data symbol vector corresponding to the number of data streams being transmitted in parallel over each MIMO channel. The multiple data symbol vectors are preceded into multiple precoded symbol vectors using a plurality of precoder cycling sets, one set for each transmission rank including multiple different precoders. The precoders in each precoder cycling set are well-separated with respect to a plurality of distance measures. The precoding includes precoding each data symbol vector of a transmission rank with a precoder belonging to the precoder cycling set of that transmission rank. The precoded symbol vectors are then transmitted over the MIMO channels.

Description

[0001] priority application [0002] Priority is claimed to US Provisional Patent Application Serial No. 61 / 020948, filed January 14, 2008, the disclosure of which is incorporated herein by reference. technical field [0003] The technical field relates to radio communications, and in particular, to radio communications using multiple-input multiple-output (MIMO) technology. Background technique [0004] In a typical radio communication system, a user communication terminal, called a User Equipment Unit (UE), communicates with other networks, such as the Internet, via a Radio Access Network (RAN). The geographical area covered by the Radio Access Network (RAN) is divided into cell areas, where each cell area is served by a base station, such as a Radio Base Station (RBS), also referred to as a "NodeB" or enhanced Node B in some networks. A cell is a geographical area where radio coverage is provided by radio base station equipment at a base station site. [0005] Third gen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/06H04B7/005H04L27/26
CPCH04B7/0639H04L2025/03426H04B7/10
Inventor G·琼格伦P·斯维德曼D·哈马瓦尔
Owner TELEFON AB LM ERICSSON (PUBL)
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