초록 ▼

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 Subs

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.

대표청구항 ▼

[The invention claimed is:] [13.]establishing, by the SU, an assigned channel which is transmitted to the base station;measuring, by the SU, a transmit power level of respective SU message channel and the assigned channel;comparing, by the SU, the transmit power level to a predetermined power value;

[The invention claimed is:] [13.]establishing, by the SU, an assigned channel which is transmitted to the base station;measuring, by the SU, a transmit power level of respective SU message channel and the assigned channel;comparing, by the SU, the transmit power level to a predetermined power value; andif the transmit power level of the SU is equivalent to or greater than the predetermined power value, inhibiting transmission of the SU message channel and disconnecting the established assigned channel.