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Radio apparatus and communication system utilizing the same

A technology of radio devices and communication units, applied in the field of communication systems, capable of solving problems such as failure to receive request signals normally

Inactive Publication Date: 2008-09-10
HERA WIRELESS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It should be noted that there is a possibility that the request signal cannot be received normally

Method used

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  • Radio apparatus and communication system utilizing the same
  • Radio apparatus and communication system utilizing the same
  • Radio apparatus and communication system utilizing the same

Examples

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Embodiment Construction

[0033] The invention will now be described based on the following examples, which are not intended to limit the scope of the invention but illustrate the invention. Not all features and combinations thereof described in these embodiments are necessarily essential to the invention.

[0034] Before describing the present invention in detail, the present invention will be outlined. Embodiments of the invention relate to MIMO systems comprising at least two radios. One radio corresponds to the transmitting device and the other corresponds to the receiving device. The transmitting device transmits a request signal to the receiving device, with which an inquiry regarding the transmission rate is made. The receiving means receives the request signal from the transmitting means and sends back a feedback signal to the transmitting means, wherein the feedback signal is a response from the receiving means carrying information about the desired transmission rate on the receiving side. ...

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Abstract

Using as a reference a known signal assigned to one of a plurality of streams that constitute a packet signal, a control unit applies a cyclic timing shift to known signals assigned to the other streams so as to produce packet signals which are to be transmitted finally. While varying the amount of timing shift, the control unit produces a plurality of packet signals and appends an identification number, with which to uniquely identify each of the plurality of produced packet signals, to each of the packet signals. A baseband processing unit and the like transmit, as a transmission rate inquiry signal, a packet signal constituted by a plurality of streams where the amounts of timing shift are made to differ, and receive a response signal to which the same identification number is appended for the inquiry signal.

Description

technical field [0001] The present invention relates to a radio device, and more particularly, to a radio device using a plurality of subcarriers and a communication system using the radio device. Background technique [0002] The OFDM (Orthogonal Frequency Division Multiplexing) modulation scheme is one of the multi-carrier communication schemes capable of high-speed data transmission and robustness in multipath environments. This OFDM modulation scheme has been applied to wireless standards such as IEEE802.11a / g and HIPERLAN / 2. Packet signals in this wireless LAN are usually transmitted through a time-varying channel environment, and are also affected by frequency selective fading. Accordingly, receiving devices typically perform channel estimation dynamically. [0003] In order for the receiving device to perform channel estimation, two known signals are provided within the packet signal. One is a known signal provided for all carriers in the beginning part of a burst ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L5/14H04B7/06H04J99/00H04W16/28H04W28/00H04W28/18
CPCH04B7/061H04B7/0671H04L1/0002H04L1/0003H04L1/0009H04L1/0028H04L27/2601H04L27/2613H04L5/0044
Inventor 田中靖浩中尾正悟
Owner HERA WIRELESS
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