Title:
RADIO EQUIPMENT AND TRANSMISISON METHOD
Document Type and Number:
Japanese Patent JP3563345
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To realize a modulation system for conducting the reception of high sensitivity in a digital modulation system used for radio communication.
SOLUTION: A BPSK modulation system is periodically inserted instead of a pilot symbol and a signal point position in the inphase/orthogonal plane of the BPSK modulation system is arranged in a position different from a signal point taking the maximum amplitude of a multivalue modulation system Thus, the signal point amplitude of the BPSK modulation system is made to be larger than the maximum signal point amplitude of the multivalue modulation system without affecting the ratio of peak power to average transmission power. Thus, the estimation precision of frequency offset and amplitude distortion quantity between a transmitter and a receiver when quasi-synchronous detection is conducted on a demodulation side improves. A bit error rate characteristic in the radio of carrier power to noise power improves and the reception of high sensitivity can be conducted.
Inventors:
Yutaka Murakami
Shinichiro Takabayashi
Masayuki Orihashi
Akihiko Matsuoka
Toshiyuki Morii
Shinichiro Takabayashi
Masayuki Orihashi
Akihiko Matsuoka
Toshiyuki Morii
Application Number:
JP2000350986A
Publication Date:
September 08, 2004
Filing Date:
September 04, 1998
Export Citation:
Assignee:
Matsushita Electric Industrial Co., Ltd
International Classes:
H04L27/18; H04L27/34; (IPC1-7): H04L27/34; H04L27/18
Domestic Patent References:
| JP58092164A | ||||
| JP5075568A | ||||
| JP2002009860A | ||||
| JP6188931A | ||||
| JP9321813A | ||||
| JP10209931A | ||||
| JP11008604A | ||||
| JP53137657A | ||||
| JP2001358789A | ||||
| JP3166724B2 | ||||
| JP3233092B2 | ||||
| JP3205313B2 | ||||
| JP11168522A | ||||
| JP2000083071A |
Other References:
村上豊、折橋雅之、松岡剛史、佐川守一,多値QAMにおけるパイロットシンボルの検討,1998年電子情報通信学会総合大会,社団法人電子情報通信学会,1998年 3月 6日,通信1、B-5-69,P.433
Attorney, Agent or Firm:
Koichi Washida
Fumio Iwahashi
Tomoyasu Sakaguchi
Hiroki Naito
Fumio Iwahashi
Tomoyasu Sakaguchi
Hiroki Naito
Previous Patent: RAW MATERIAL FOR BROWN RICE TEA USING DEED OCEAN WATER
Next Patent: RADIO EQUIPMENT AND TRANSMITTING METHOD
Next Patent: RADIO EQUIPMENT AND TRANSMITTING METHOD