Title:
OFDM COMMUNICATION APPARATUS
Document Type and Number:
WIPO Patent Application WO/2007/015494
Kind Code:
A1
Abstract:
An OFDM Communication apparatus capable of improving the spectrum efficiency and
data transmission efficiency of the OFDM system. In this apparatus, an IDFT part
(201) generates OFDM symbols. A CP inserting part (202) inserts a cyclic prefix
among the OFDM symbols. A transport RF part (203) modulates the OFDM symbols, among
which the cyclic prefix has been inserted, into a radio frequency band. An antenna
(204) transmits the modulated signal. A control part (205) controls the cyclic
prefix length and the OFDM symbol length in accordance with the network quality.
An antenna (206) receives the signal, which is then down-converted by a received
RF part (207) to the baseband signal. A CP removing part (208) removes CP from the
baseband signal. A DFT part (209) performs DFT to demodulate the data streams
of the respective subcarriers. A network quality estimating part (210) uses
a received pilot signal to estimate, as network qualities, the Doppler frequency shift
and the delay spread RMS value of a channel. A control part (211) controls the processings
of the CP removing part (208) and DFT part (209).
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Inventors:
LI HAITAO
LI JIFENG
LI JIFENG
Application Number:
PCT/JP2006/315235
Publication Date:
February 08, 2007
Filing Date:
August 01, 2006
Export Citation:
Assignee:
MATSUSHITA ELECTRIC IND CO LTD (JP)
LI HAITAO
LI JIFENG
LI HAITAO
LI JIFENG
International Classes:
H04J11/00
Domestic Patent References:
| WO2005004428A1 | 2005-01-13 |
Foreign References:
| JP2005150850A | 2005-06-09 | |||
| JP2002345035A | 2002-11-29 |
Attorney, Agent or Firm:
WASHIDA, Kimihito (Shintoshicenter Bldg. 24-1, Tsurumaki, 1-chom, Tama-shi Tokyo 34, JP)
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