发明名称 |
Capacity management method for a code division multiple access (CDMA) communication system |
摘要 |
A multiple access, spread-spectrum communication system processes a plurality of information signals received by a Radio Carrier Station (RCS) over telecommunication lines for simultaneous transmission over a radio frequency (RF) channel as a code-division-multiplexed (CDM) signal to a group of Subscriber Units (SUs). The RCS receives a call request signal that corresponds to a telecommunication line information signal, and a user identification signal that identifies a user to receive the call. The RCS includes a plurality of Code Division Multiple Access (CDMA) modems, one of which provides a global pilot code signal. The modems provide message code signals synchronized to the global pilot signal. Each modem combines an information signal with a message code signal to provide a CDM processed signal. The RCS includes a system channel controller is coupled to receive a remote call. An RF transmitter is connected to all of the modems to combine the CDM processed signals with the global pilot code signal to generate a CDM signal. The RF transmitter also modulates a carrier signal with the CDM signal and transmits the modulated carrier signal through an RF communication channel to the SUs. Each SU includes a CDMA modem which is also synchronized to the global pilot signal. The CDMA modem despreads the CDM signal and provides a despread information signal to the user. The system includes a closed loop power control system for maintaining a minimum system transmit power level for the RCS and the SUs, and system capacity management for maintaining a maximum number of active SUs for improved system performance. |
申请公布号 |
US6212174(B1) |
申请公布日期 |
2001.04.03 |
申请号 |
US19970956980 |
申请日期 |
1997.10.23 |
申请人 |
INTERDIGITAL TECHNOLOGY CORPORATION |
发明人 |
LOMP GARY;KOWALSKI JOHN;OZLUTURK FATIH;SILVERBERG AVI;REGIS ROBERT;LUDDY MICHAEL;MARRA ALEXANDER;JACQUES ALEXANDER |
分类号 |
H03K3/84;H04B1/707;H04B7/005;H04B7/216;H04B7/26;H04B17/00;H04J11/00;H04J13/00;H04J13/04;H04J13/10;H04L1/00;H04L7/00;H04L7/033;H04L25/02;H04L27/00;H04L27/20;H04L27/233;H04W52/04;H04W52/14;H04W52/24;(IPC1-7):H04B7/216 |
主分类号 |
H03K3/84 |
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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