Beam-steering and beam-forming for wideband MIMO/MISO systems

A wideband, control vector technology, applied in the field of data communication, which can solve the problems of degradation, channel condition deterioration, etc.

Inactive Publication Date: 2005-10-26
QUALCOMM INC
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Problems solved by technology

Furthermore, channel conditions can deteriorate to the point that most spatial subchannels are severely degraded

Method used

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  • Beam-steering and beam-forming for wideband MIMO/MISO systems
  • Beam-steering and beam-forming for wideband MIMO/MISO systems
  • Beam-steering and beam-forming for wideband MIMO/MISO systems

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[0020] The beam steering and beamforming techniques described herein can be used in various wideband MIMO / MISO communication systems. For brevity, these techniques are described specifically for a MIMO-OFDM system that effectively divides the total system bandwidth into N F an orthogonal subband.

[0021] The model of MIMO-OFDM system can be expressed as:

[0022] y (k)= H (k) x (k)+ n (k) for k ∈ {1,...,N F}, Formula 1)

[0023] in y (k) is N via the kth subband R The number of symbols received by the root receiving antenna is N R items{y i (k)} (for i∈{1,...,N R}) (i.e. the "receive" vector);

[0024] x (k) is for N from the kth subband T The number of symbols sent by the root transmitting antenna is N T item{x j (k)} (for j∈{1,...,N T}) (i.e. the "send" vector);

[0025] H (k) is a term {h ij (k)} (for i∈{1,...,N R} and j ∈ {1,...,N T}) of (N R ×N T ) channel response matrix, these entries are N from the kth subband T root transmit an...

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Abstract

Techniques to perform beam-steering and beam-forming to transmit data on a single eigenmode in a wideband multiple-input channel. In one method, a steering vector is obtained for each of a number of subbands. Depending on how the steering vectors are defined, beam-steering or beam-forming can be achieved for each subband. The total transmit power is allocated to the subbands based on a particular power allocation scheme (e.g., full channel inversion, selective channel inversion, water-filling, or uniform). A scaling value is then obtained for each subband based on its allocated transmit power. Data to be transmitted is coded and modulated to provide modulation symbols. The modulation symbols to be transmitted on each subband are scaled with the subband's scaling value and further preconditioned with the subband's steering vector. A stream of preconditioned symbols is then formed for each transmit antenna.

Description

[0001] background technical field [0002] The present invention relates generally to data communications, and more particularly to techniques for performing beam steering and beamforming for wideband MIMO / MISO systems. Background technique [0003] A multiple-input multiple-output (MIMO) communication system uses multiple (N T ) transmitting antenna and multiple (N R ) receiving antenna for data communication. by N T root transmit antenna and N R The MIMO channel formed by the root receiving antenna can be decomposed into N S independent channels, where N s ≤min{N T , N R}. N S Each of the independent channels is also called a spatial subchannel or eigenmode of the MIMO channel. [0004] The multiple-input single-output (MISO) communication system uses multiple (N T ) transmitting antenna and a single receiving antenna for data communication. by N T A MISO channel formed by one transmit antenna and a single receive antenna includes a single spatial subchannel o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04J99/00H01Q3/26H04B7/005H04B7/04H04B7/06H04J11/00H04L27/26
CPCH04L25/0246H04B7/0617H04L2025/03802H04L5/0085H04B7/0417H04L5/0044H01Q3/26H04B7/043H04L25/03343H04L25/0248H04L5/0025H04L5/0096H04L5/0053H04L5/006H04B7/0634H04L2025/03426H04W52/42H04L2025/03414H04L25/0204H04B7/0408H04B7/0443H04L27/2602
Inventor M·P·梅农J·W·凯淳M·华莱士J·R·沃顿S·J·海华德
Owner QUALCOMM INC
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