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

Method and equipment of wave beam formation in radio communication system

A technology for sending beams and carriers, applied in the field of wireless data communication, can solve problems such as high cost and difficult realization of signal propagation characteristics

Inactive Publication Date: 2004-10-06
QUALCOMM INC
View PDF11 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In an effort to increase capacity, cells are often divided into sectors or smaller cells that operate at lower power, but this approach is expensive and difficult in areas with widely varying signal propagation characteristics. accomplish

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
  • Method and equipment of wave beam formation in radio communication system
  • Method and equipment of wave beam formation in radio communication system
  • Method and equipment of wave beam formation in radio communication system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0032] figure 1 Terrestrial base station 102 transmitting to subscriber station 112 in cell area 124 and terrestrial base station 104 transmitting to subscriber station 116 in cell area 126 are shown. Base station 102 transmits via multiple transmit antennas 106 and base station 104 transmits via multiple transmit antennas 108 . Although only two transmit antennas are shown per base station, the invention is also applicable to base stations with two or more transmit antennas. Additionally, those skilled in the art will understand that various types and polarizations of antennas, including omnidirectional and 120 degree antennas, may be used without departing from the invention. Additionally, the antenna used for transmission from a base station may be of a different type than other antennas used by the same base station without departing from the invention.

[0033] The signals transmitted through the multiple antennas of a single base station are identical except for the di...

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

In a CDMA data communication system capable of variable rate transmission, utilization of beamforming techniques decreases the average interference caused by transmissions of a base station (104) to subscriber stations (112) in neighboring cells (124). Base stations (102, 104) utilize multiple transmit antennas (106, 108), each transmitting signals at controlled phases, to form transmit signal beams (110, 118, 122) corresponding to individual subscriber stations (112, 116, 114). Data and reference signals are transmitted along beams (110, 118, 122) that change according to fixed time slots and subslots in order to maximize carrier-to-interference ratios (C / I) measured at subscriber stations (112, 116, 114).

Description

[0001] The present invention is a divisional application with the application number 00812245.8, the international application number PCT / US 00 / 23925, and the application date: August 31, 2000, entitled "Method and Device for Beam Forming in a Wireless Communication System". technical field [0002] The present invention relates to wireless data communications. In particular, the present invention relates to a novel and improved method and apparatus for high rate packet data transmission in a wireless communication system. Background technique [0003] Today's communication systems need to support a variety of applications. One such communication system is the Code Division Multiple Access (CDMA) system, which follows the "TIA / EIA / IS-95 Mobile Station-Base Station Compatibility Standard for Dual-Mode Wideband Spread Spectrum Cellular System", hereafter referred to as IS-95 standard. A CDMA system allows voice and data communication between users over land links. The use o...

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 Applications(China)
IPC IPC(8): H04B7/26H04B7/06
CPCH04B7/0632H04B7/0617H04W72/0446H04W72/542
Inventor A·加拉利
Owner QUALCOMM INC