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Space-time scrambling for cellular systems

A cellular system, time interval technology, applied in the field of communication, can solve the problems of reducing measurement accuracy and channel predictability, reducing link adaptability, etc.

Active Publication Date: 2008-05-28
QUALCOMM INC
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Decreased measurement accuracy and channel predictability reduces link adaptation for said other terminals

Method used

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  • Space-time scrambling for cellular systems
  • Space-time scrambling for cellular systems
  • Space-time scrambling for cellular systems

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Embodiment Construction

[0030] As used herein, the term "exemplary" is used 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.

[0031] The transmission techniques described herein may be used in various cellular systems, eg, CDMA systems, TDMA systems, FDMA systems, OFDMA systems, and so on. A CDMA system may implement one or more CDMA radio access technologies (RATs) such as Wideband-CDMA (W-CDMA), cdma2000, and so on. cdma2000 includes IS-2000, IS-856 and IS-95 standards. Thus, the CDMA system may be a W-CDMA system or a cdma2000 system. A TDMA system may implement one or more TDMA RATs such as Global System for Mobile Communications (GSM), Digital Advanced Mobile Phone System (D-AMPS), and so on. The various RATs and standards are known in the art. W-CDMA and GSM are described in documents from an organization named "3rd Generation Partnership Project" (3GPP). cdma20...

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PUM

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Abstract

Techniques for transmitting data with space-time scrambling in cellular systems (e.g., CDMA systems) are described. At least one stream of data symbols is generated, mapped to one or more physical channels, and spread with channelization codes for the physical channels. Space-time scrambling is performed on the at least one stream of data symbols to generate at least two streams of output chips. The space-time scrambling may be achieved by performing matrix multiplication with a sequence of matrices. For each time interval in which space-time scrambling is performed, a matrix may be selected (e.g., based on a scrambling code for a base station), and data to be sent in the time interval is multiplied with the selected matrix. The matrices used for space-time scrambling may be defined and selected in various manners. The streams of output chips are processed and transmitted from respective transmit antennas.

Description

[0001] Claiming Priority Based on 35 U.S.C. §119 [0002] This patent application claims Provisional Application No. 60 / 663,504, filed March 18, 2005, entitled "Space-Time Scrambling for Cellular Systems," and filed August 22, 2005, entitled "Space-Time Scrambling for Cellular Systems", both of which are assigned to the assignee of the present application and are hereby incorporated by reference into the present application. technical field [0003] The present disclosure relates generally to communications, and more particularly to techniques for transmitting data in cellular systems. Background technique [0004] A cellular system is a wireless multiple-access communication system that can simultaneously communicate with multiple terminals such as cellular phones. A cellular system may use multiple access techniques such as Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), or Orthogonal Frequency Divisio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/06H04B1/707H04J99/00
CPCH04L1/0065H04L1/0675H04L1/0618H04L1/0625H04B7/2628
Inventor H·D·朔坦恩J·R·沃尔顿
Owner QUALCOMM INC
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