Unlock instant, AI-driven research and patent intelligence for your innovation.

Iterative eigenvector computation for a MIMO communication system

An eigenvector and communication system technology, applied in the field of data communication, can solve problems such as the impact of accuracy and performance

Inactive Publication Date: 2012-10-03
QUALCOMM INC
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Also, the accuracy of the eigenvectors can have a big impact on performance

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Iterative eigenvector computation for a MIMO communication system
  • Iterative eigenvector computation for a MIMO communication system
  • Iterative eigenvector computation for a MIMO communication system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0014] The word "exemplary" is used herein to mean "serving as an example, instance, or illustration." Any embodiment described herein as "exemplary" should not be construed as preferred or superior to other embodiments.

[0015] The eigenvector computation techniques described herein can be used in single-carrier MIMO systems as well as in multi-carrier MIMO systems. For clarity, the techniques are specifically described for a single-carrier MIMO system.

[0016] a. Single Carrier MIMO System

[0017] figure 1 A simplified block diagram of a transmitting entity 110 and a receiving entity 150 in a single carrier MIMO system 100 is shown. At the transmitting entity 110, the transmit (TX) spatial processor 120 utilizes the eigenvector matrix For data notation (represented as a vector s ) perform spatial processing to generate emitted symbols (represented as vectors x ). As used herein, a "data symbol" is a modulation symbol for data, a "pilot symbol" is a modulation sy...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

A matrix (I) of eigenvectors is derived using an iterative procedure. For the procedure, an eigenmode matrix Vi is first initialized, e.g., to an identity matrix. The eigenmode matrix Vi is then updated based on a channel response matrix (II) for a MIMO channel to obtain an updated eigenmode matrix Vi+1. The eigenmode matrix may be updated for a fixed or variable number of iterations. The columns of the updated eigenmode matrix may be orthogonalized periodically to improve performance and ensure stability of the iterative procedure. In one embodiment, after completion of all iterations, the updated eigenmode matrix for the last iteration is provided as the matrix (III).

Description

technical field [0001] The present invention relates generally to data communications and, more particularly, to techniques for deriving eigenvectors for spatial processing in multiple-input multiple-output (MIMO) communication systems. Background technique [0002] MIMO systems use multiple (N T ) transmit antennas and multiple (N R ) receiving antenna for data transmission. N T transmit antennas and N R A MIMO channel composed of receiving antennas can be decomposed into N S spatial channels, where N S ≤min{N T , N R}. N S Each spatial channel can be used to transmit data in parallel for higher overall throughput, or redundantly for higher reliability. [0003] Typically, in MIMO systems, up to N S data streams can be simultaneously from N T transmitting on a transmitting antenna. However, these data streams interfere with each other at the receiving antenna. N through the MIMO channel S Improved performance can be achieved by transmitting data on eigenmodes...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): H04B7/04H04B7/06H04L25/02H04J99/00H04L25/03
CPCH04B7/0615H04B7/0413H04B7/0456
Inventor 史蒂文·J·霍华德约翰·W·凯彻姆马克·S·华莱士彼得·蒙森杰伊·罗德尼·沃尔顿
Owner QUALCOMM INC