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OFDM wireless communication method and wireless communication apparatus

A technology of wireless communication and wireless communication system, applied in the field of cellular communication, to achieve the effects of reducing interference, reducing power consumption, and alleviating interference between cells

Inactive Publication Date: 2008-09-03
HITACHI LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

There is also the issue of improving the success rate of synchronization establishment at the time of reception in a certain configuration such as a macro cell that may cause transmission delays

Method used

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  • OFDM wireless communication method and wireless communication apparatus
  • OFDM wireless communication method and wireless communication apparatus
  • OFDM wireless communication method and wireless communication apparatus

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0130] [instructions]

[0131] Fig. 14 shows a configuration example of the system.

[0132] The system includes base stations (Base Station: BS) 1401-1403 and mobile stations (1404-1406) connected on an IP network (1400). The base station and the mobile station transmit and receive by means of TDMA-TDD communication. The modulation method adopts OFDM.

[0133] Signals transmitted and received are classified into control channels (CCH) and data channels (DCH). The downlink control channel is a channel for transmitting notification information and reception information indicating the state of the base station to the mobile station. The uplink control channel is used to request call initiation. The data channel is used to send and receive user data.

[0134] [Basic frame composition]

[0135] FIG. 15 shows the basic frame configuration of Embodiment 1 of the present invention.

[0136] A base frame 1510 is composed of a predetermined number of TDMA frames 1501 . In TDMA ...

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Abstract

The invention relates to a wireless communication method and a wireless communication device. In a wireless communication system with at least two communicators communicating in TDD wireless communication manner on the basis of OFDMA, a first communicator sends a pilot signal in a sub-band full region formed by segmenting a predetermined system frequency band, a second communicator having a plurality of antennae infers the sub-channel transmission channels of the continous frequency blocks of the sub-band from the received pilot signal, and determines the array weights used when sending signals to the first communicator according to the inferred result.

Description

technical field [0001] The present invention relates to a wireless communication method and a wireless communication device, in particular to adopting Orthogonal Frequency Division Multiplexing (OFDMA: Orthogonal Frequency Division Multiplexing) to implement cellular communication through Orthogonal Frequency Division Multiple Access (OFDMA: Orthogonal Frequency Division Multiple Access). technology of communication. Background technique [0002] In wireless communication, since available frequency resources are limited, how to achieve high frequency utilization efficiency and high communication speed within the limited frequency domain bandwidth becomes a major key to the realization of the system. Against such a background, research and development using an OFDM wireless communication technology that enables user scheduling of frequency bands is being conducted. OFDM generates transmission data in the frequency domain, transforms it into a signal in the time domain throug...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/204H04B1/707H04L27/26H04B7/10H04B7/26H04J1/00H04J3/00H04J11/00H04J13/00H04W16/28
CPCH04L5/0007H04L27/2656H04L5/0016H04L5/0053H04L5/1469H04L25/0224H04L5/0051H04J11/0069H04B7/0617
Inventor 古枝幸一郎桑原干夫佐藤淳彦村田一郎
Owner HITACHI LTD