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Method and arrangement for adapting a multi-antenna transmission

An adaptive, multi-antenna technology that can be used in diversity/multi-antenna systems, wireless communications, space transmit diversity, etc., and can solve problems such as amplifier power imbalance

Active Publication Date: 2010-03-17
TELEFON AB LM ERICSSON (PUBL)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This often leads to power imbalance issues on the amplifier, and existing techniques for pooling PAs are no longer useful because of the mix of block and non-block diagonal elements

Method used

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  • Method and arrangement for adapting a multi-antenna transmission

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Embodiment Construction

[0028] The present invention is defined as methods and structures in each of the first node and the second node, which can be implemented in the embodiments described below.

[0029] figure 1A first node 100 in a wireless communication system 110 is depicted. The wireless communication system 110 may be a cellular system, and / or, for example, a system such as Long Term Evolution (LTE), Evolved Universal Terrestrial Radio Access (E-UTRA), Worldwide Interoperability for Microwave Access (WiMAX), Universal Terrestrial Radio Access Transmit (UTRA), Wideband Code Division Multiple Access (WCDMA), GSM, Ultra Mobile Broadband (UMB), or any other wireless communication system that utilizes techniques that perform adaptation between different forms of transmission and use multiple antennas . The first node 100 is arranged to communicate with a second node 120 in a wireless communication system 110 via a wireless channel 130 . The input-output relationship of the wireless channel dur...

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Abstract

A method in a first node for adapting a multi-antenna transmission to a second node over a wireless channel is provided. The wireless channel has at least three inputs and at least one output. The first node and the second node are comprised in a wireless communication system. The method comprising the steps of: Obtaining (401) at least one symbol stream; Determining (403) a precoding matrix having a product structure created by a block diagonal matrix being multiplied from the left with a block diagonalizing unitary matrix; Precoding (404) the at least one symbol stream with the determined precoding matrix; And Transmitting (405) the precoded at least one symbol stream over a wireless channel to the second node.

Description

technical field [0001] The invention relates to methods and structures in a first node and methods and structures in a second node. In particular, the invention relates to adaptive multi-antenna transmission from a first node to a second node via a wireless channel. Background technique [0002] Using multiple antennas at the transmitter and / or receiver of a node in a wireless communication system can significantly increase the capacity and coverage of the wireless communication system. Such multiple-input multiple-output (MIMO) systems exploit the spatial dimension of the communication channel to improve performance, for example by sending several parallel information-carrying signals (so-called spatial multiplexing). Significant additional gain can be obtained by adapting the transmission to current channel conditions. One form of adaptation is to dynamically adjust the number of simultaneously transmitted information-carrying signals that a channel can support from one ...

Claims

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Application Information

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IPC IPC(8): H04B7/06H04B7/08H04B7/10
CPCH04B7/0417H04L2025/03426H04B7/0469H04B7/0465H04L25/03343H04B7/10H04B7/0639H04B7/06H04B7/08H04B1/707H04B7/04H04B7/0413H04B7/0456H04B7/0697H04J11/00H04W24/02H04W72/0446H04W88/02H04W88/08
Inventor 乔治·约恩格伦
Owner TELEFON AB LM ERICSSON (PUBL)
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