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Transmission system, transmission method, transmission equipment

A transmission system and transmission device technology, applied in the field of transmission systems, can solve problems such as changes, and achieve the effect of improving reception quality

Inactive Publication Date: 2006-01-25
NTT DOCOMO INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the case of using multi-carrier / DS-CDMA as wireless access to solve wireless bandwidth expansion, there is such a problem that the effect of wireless links, especially due to MPI, the reception quality of wireless signals increases with the wireless bandwidth of each carrier , that is, the carrier number changes significantly with the

Method used

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  • Transmission system, transmission method, transmission equipment
  • Transmission system, transmission method, transmission equipment
  • Transmission system, transmission method, transmission equipment

Examples

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no. 1 example

[0030] Summary of transfer methods

[0031] Hereinafter, an embodiment of the transmission method according to the present invention will be described. figure 1 The concept of the transmission method of this embodiment is shown. figure 1 The frequency spectrum of a DS-CDMA signal transmitted with an "n" slice of parallel carriers is given in .

[0032] The transmission method according to this embodiment is applied to the case where a plurality of signals are transmitted between a transmission device and a reception device using a plurality of carriers, the number of carriers being evaluated on the basis of characteristics of a wireless link between the transmission device and the reception device definite. Here, when the MPI is small, the number of carriers decreases; when the MPI is large, the number of carriers increases.

[0033] Specifically, such as figure 1 As shown, the transmitting device uses the wireless bandwidth used for wireless communication between the tran...

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Abstract

The transmission system of the present invention is designed to transmit a plurality of signals between the transmitter and the receiver using a plurality of carriers and comprises a radio link characteristics estimator (4) configured to estimate the characteristics of a radio link between the transmitter and the receiver and a carrier quantity determination unit (3) configured to determine the number of carriers according to the result of the estimate by the radio link characteristics estimator (4). The radio link characteristics estimator (4) estimates the characteristics according to an interval in delay time of multipath signals and the number of the multipath signals. The carrier quantity determination unit (3) determines fewer carriers when multipath interference is small, and determines more carriers when the multipath interference is great.

Description

technical field [0001] The present invention relates to a transmission system, a transmission method and a transmission device for transmitting a plurality of signals using a plurality of carriers, for example, a multi-carrier / DS-CDMA, between a transmission device and a reception device. Background technique [0002] This application is based on and claims priority from a prior Japanese Patent Application No. P2001-345171 with a filing date of November 9, 2001, the entire contents of which are hereby incorporated by reference. [0003] Wideband Code Decomposition Multiplexing Access (CDMA) and cdma2000 have been used as the wireless access method of the third generation mobile telecommunication system (IMT-2000). The wireless bandwidth of each carrier is: 1.5MHz for W-CDMA and 1.25MHz for cdma2000. [0004] In a mobile communication environment, a transmitted wireless signal arrives at the receiving device as multiple wireless signals (multi-path signals), where each signa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04J13/02H04Q7/20H04B7/26H04J1/02H04B1/707H04B1/711H04L5/02H04L25/02H04L27/26H04W16/28H04W28/18
CPCH04L5/026H04L25/0216H04B1/7115H04B1/7117H04L25/0236H04B7/26
Inventor 诹访真悟新博行安部田贞行佐和桥卫
Owner NTT DOCOMO INC