Title:
RADIO COMMUNICATION EQUIPMENT
Document Type and Number:
Japanese Patent JP3464656
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To improve the receiving sensitivity characteristics of a receiver by arranging the signal point of a pilot symbol while keeping the average transmission power of a transmitter at a certain constant level.
SOLUTION: In a radio communication system for performing adaptive modulation, the signal point of the pilot symbol is arranged on an in-phase-quadrature plane (IQ plane) so as to make receiving sensitivity in the receiver best while keeping the average transmission power of the transmitter at the certain constant level. When the amplitude of the pilot symbol signal point is defined as rpilot and the rpilot is made large, resistance to noise of the pilot symbol becomes strong, the estimated accuracy in fading distortion and estimated accuracy in frequency offset are improved in the receiver, highly accurate detection can be performed, thereby receiving sensitivity characteristics of the receiver is improved.
Inventors:
Yutaka Murakami
Shinichiro Takabayashi
Katsuaki Abe
Masayuki Orihashi
Akihiko Matsuoka
Shinichiro Takabayashi
Katsuaki Abe
Masayuki Orihashi
Akihiko Matsuoka
Application Number:
JP2001245052A
Publication Date:
November 10, 2003
Filing Date:
August 10, 2001
Export Citation:
Assignee:
Matsushita Electric Industrial Co., Ltd
International Classes:
H04L27/18; H04B1/04; H04B7/26; H04J11/00; H04J13/00; H04L27/00; H04L27/34; H04W52/04; H04W72/04; (IPC1-7): H04L27/34; H04B1/04; H04B7/26; H04J11/00; H04J13/04; H04L27/00; H04L27/18
Domestic Patent References:
| JP9200282A | ||||
| JP57155856A | ||||
| JP57159148A |
Attorney, Agent or Firm:
Koichi Washida
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