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:] [5.]5. A bearer channel modification system for a multiple access spread-spectrum communication system including a plurality of information signals each having a respective rate, the system comprisinga plurality of message code channels, each of the channels being able t

[ The invention claimed is:] [5.]5. A bearer channel modification system for a multiple access spread-spectrum communication system including a plurality of information signals each having a respective rate, the system comprisinga plurality of message code channels, each of the channels being able to convey information at a respective predetermined information channel rate, wherein an information signal is transmitted as at least one message code channel as a Code Division Multiplexed (CDM) signalmeans for providing a plurality of call type signals corresponding to the information signal rates for the information signals;a transmitter including a first information channel mode modification means responsive to the call type signal for changing the information signal from a first one of the message code signals to a second one of the message code signals which second message code signal has a respective information channel rate; anda receiver including a second information channel mode modification means responsive to the call type signal for changing a received information signal from the first message code signal to the second message code signal to receive the information signal at the respective information channel rate.