发明名称 |
MODULATION DEVICE, DEMODULATION DEVICE, AND ACOUSTIC SIGNAL TRANSMISSION METHOD |
摘要 |
An object is to provide a modulation device, a demodulation device, and a transmission system and acoustic signal transmission method using them which can carry out a synchronization process for data signals without using a carrier frequency for a synchronization signal. A modulation device 3 transmits an acoustic signal superposed with a PN sequence set according to a carrier frequency and a data signal. A demodulation device 9 receives the acoustic signal, determines the PN sequence having the highest maximum correlation value with the acoustic signal in a plurality of PN sequences, detects a symbol synchronization point according to the correlation value between thus determined PN sequence and the acoustic signal, and performs a synchronization process. Thereafter, according to the detected synchronization point and determined PN sequence, an OFDM demodulation processing unit 38 decides the carrier frequency band of the data signal superposed on the acoustic signal and demodulates the data signal. |
申请公布号 |
EP2166683(A1) |
申请公布日期 |
2010.03.24 |
申请号 |
EP20080765020 |
申请日期 |
2008.06.03 |
申请人 |
NTT DOCOMO, INC. |
发明人 |
MATSUOKA, HOSEI;YOSHIMURA, TAKESHI;KAWAHARA, TOSHIROU |
分类号 |
H04L27/26;H04B1/707;H04B1/7073;H04B11/00;H04J11/00;H04L7/00 |
主分类号 |
H04L27/26 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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