发明名称 |
QUADRATURE SPREAD SPECTRUM COMMUNICATION SYSTEM AND CODE DIVISION MULTIPLE ACCESS SYSTEM |
摘要 |
PURPOSE: To improve the transmission characteristic by using a correlation processing means with gate between a spread demodulation code and a signal in a spread code length block after the synchronization between a reception signal and a spread demodulation code is established in spread demodulation processing. and to reduce interference between spread spectrum signals. CONSTITUTION: A guard block code addition section 10 at a transmitter side adds a code of a guard time block to a modified M sequence to generate a spread spectral code. Then input information bit 1 is modulated by an information modulation section 2 and subject to spread spectrum processing at a spread spectrum modulation section 3 based on the spread code to be a spread spectrum signal 4. Furthermore, a spread spectrum code generating section 17 at a receiver side generates a spread spectrum signal for spread spectrum demodulation and a spread spectrum demodulation section 15 applies gated correlation processing to the signal and a received spread spectrum signal 14 by a spread spectrum demodulation section 15 to attain spread spectrum modulation without interference. Then an information demodulation section 16 demodulates the information to provide an output of output bit information 22. |
申请公布号 |
JPH0897749(A) |
申请公布日期 |
1996.04.12 |
申请号 |
JP19940254556 |
申请日期 |
1994.09.22 |
申请人 |
YUSEISHO TSUSHIN SOGO KENKYUSHO |
发明人 |
SASAOKA SHUICHI |
分类号 |
H04B1/707;H04B1/7073;H04W56/00;H04W72/04 |
主分类号 |
H04B1/707 |
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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