发明名称 |
Up-link access apparatus in direct sequence code division multiple access system |
摘要 |
Disclosed is a link access apparatus of a CDMA system using a DS/SS communication method, and more particularly an up-link access apparatus which overcomes a near/far problem occurring when mobile stations and a base station perform multiple access communication using code division. An up-link access apparatus in a DS/SS-CDMA system has a transmitter for mixing data to be transmitted to a base station with a PN code unique to that mobile station to thereby PN code modulate the data. The transmitter then mixes the PN code modulated data with a carrier having a frequency that is shifted by an identification frequency to thereby output a spread spectrum signal. The apparatus further includes a receiver for mixing a demodulation carrier made up of the PN code and the identification frequency with the spread spectrum signal from the transmitter to thereby output a mixed signal. The mixed signal is then integrated according to a period having a reciprocal corresponding to the identification frequency, demodulated and output as a digital signal.
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申请公布号 |
US5604732(A) |
申请公布日期 |
1997.02.18 |
申请号 |
US19940364719 |
申请日期 |
1994.12.27 |
申请人 |
SAMSUNG ELECTRONICS CO., LTD. |
发明人 |
KIM, JE-WOO;PARK, JONG-HYEON |
分类号 |
H04B1/707;H04B7/26;H04Q7/38;(IPC1-7):H04J13/04 |
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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