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Adaptive beam-steering methods to maximize wireless link budget and reduce delay-spread using multiple transmit and receive antennas

An adaptive beam, receiving antenna technology, applied in a field of methods used by technicians, can solve problems such as increasing link budget

Active Publication Date: 2009-04-22
QUALCOMM INC
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  • Description
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Problems solved by technology

Another beamforming proposal uses a direct singular value decomposition technique that would result in a very complex implementation that is not suitable for consumer and mobile wireless applications, and thus imposes a limit on the dimensionality of MIMO systems, i.e. the number of antennas, and thus increases the maximum achievable chain road budget

Method used

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  • Adaptive beam-steering methods to maximize wireless link budget and reduce delay-spread using multiple transmit and receive antennas
  • Adaptive beam-steering methods to maximize wireless link budget and reduce delay-spread using multiple transmit and receive antennas
  • Adaptive beam-steering methods to maximize wireless link budget and reduce delay-spread using multiple transmit and receive antennas

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Embodiment Construction

[0020] An efficient and adaptive technique for performing beamforming on a time-varying propagation channel with reduced, and potentially minimal complexity, and increased, potentially maximum gain. In contrast to existing solutions, performing beamforming does not require direct implementation of Singular Value Decomposition (SVD), which is complex to implement. Alternatively, the optimal channel eigenvectors or subspaces are obtained via an adaptive iterative scheme. A side effect of beamforming is that the resulting beamformed channel typically has a shorter delay spread, meaning that the inter-symbol interference (ISI) window is also shorter.

[0021] In the following description, numerous details are set forth in order to provide a more thorough explanation of the invention. It will be apparent, however, to one skilled in the art that the invention may be practiced without these details. In other instances, well-known structures and devices are shown briefly in block di...

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Abstract

A method and an apparatus for adaptive beam-steering are disclosed. In one embodiment, the method comprises performing adaptive beam steering using multiple transmit and receive antennas, including iteratively performing a pair of training sequences, wherein the pair of training sequences includes estimating a transmitter antenna-array weight vector and a receiver antenna-array weight vector.

Description

[0001] This application claims priority to U.S. Provisional Application No. 60 / 773,508, filed February 14, 2006, entitled "Adaptive Beam-Steering Methods to Maximize Wireless Link Budge and Reduce Delay-Spread Using Multiple Transmit and Receive Antennas" , the entire contents of which are hereby incorporated by reference. Background technique [0002] In most wireless communication systems, the air link consists of a propagation channel between a transmit antenna and a receive antenna. It has been determined, however, that the use of multiple antennas at the transmitter and receiver significantly increases the link budget and thus link capacity. The disadvantage of this approach is that the system complexity may also be significantly increased. Systems with multiple transmit and receive antennas are known as wireless MIMO (Multiple Input Multiple Output) systems. [0003] For MIMO systems, the increase in link budget or link capacity is achieved through one of the following...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/06H04B7/08
Inventor K·纳西尔-图希J·M·吉尔伯特C·S·宋D·M·切尔尼亚夫斯基
Owner QUALCOMM INC
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