초록 ▼

A new signal processing architecture for base stations and gateways (124, 126) used in spread spectrum communication systems (100) that simplifies data transfer, reduces required bus capacity, and does not require special synchronization of signals that are to be combined. A series of transmission m

A new signal processing architecture for base stations and gateways (124, 126) used in spread spectrum communication systems (100) that simplifies data transfer, reduces required bus capacity, and does not require special synchronization of signals that are to be combined. A series of transmission modules (5081-508M) are used to transfer data to corresponding ones of a series of analog transmitters (4121-412M) used to form communication circuits for each system user. Each transmission module (5081-508M) employs a series of encoders (502MR) and modulators (504MS) to form spread communication signals, using appropriate PN spreading codes. Spread spectrum communication signals from each module (508) for each system user (D), are summed together (5101-510M) and transferred to a single analog transmitter (412) associated with that module. The signals being combined are automatically synchronized by common timing signals used for elements within each module. The number of processing elements within each module is such that at least one processing path is available for each user or user channel over which it is desired to transmit information through the connected analog transmitter (4121-412M). Data is output from the modules (5081-508M) at a greatly reduced transfer rate which can be more easily accommodated using current technology. This is very useful for satellite based communication systems, or high capacity cellular systems, and this system architecture can be accomplished cost effectively using a series of easily manufactured circuit modules.

대표청구항 ▼

A new signal processing architecture for base stations and gateways (124, 126) used in spread spectrum communication systems (100) that simplifies data transfer, reduces required bus capacity, and does not require special synchronization of signals that are to be combined. A series of transmission m

A new signal processing architecture for base stations and gateways (124, 126) used in spread spectrum communication systems (100) that simplifies data transfer, reduces required bus capacity, and does not require special synchronization of signals that are to be combined. A series of transmission modules (5081-508M) are used to transfer data to corresponding ones of a series of analog transmitters (4121-412M) used to form communication circuits for each system user. Each transmission module (5081-508M) employs a series of encoders (502MR) and modulators (504MS) to form spread communication signals, using appropriate PN spreading codes. Spread spectrum communication signals from each module (508) for each system user (D), are summed together (5101-510M) and transferred to a single analog transmitter (412) associated with that module. The signals being combined are automatically synchronized by common timing signals used for elements within each module. The number of processing elements within each module is such that at least one processing path is available for each user or user channel over which it is desired to transmit information through the connected analog transmitter (4121-412M). Data is output from the modules (5081-508M) at a greatly reduced transfer rate which can be more easily accommodated using current technology. This is very useful for satellite based communication systems, or high capacity cellular systems, and this system architecture can be accomplished cost effectively using a series of easily manufactured circuit modules. es available over either service vehicle to customer devices including a set top box. at a predetermined data rate using the received distinct spreading codes, the wireless data communication being simultaneously conducted through a fundamental code channel and at least one supplemental code channel; receiving a first closed loop power control command from the base station, the first closed loop power control command requesting an increase in transmission power of the mobile station transmitter; determining in the mobile station if the increased transmission power will exceed an output power limit of the mobile station; if so, terminating data transmission through at least one of the at least one supplemental code channel and increasing the transmission power on the fundamental data channel and any of the at least one supplemental code channel that carry data transmissions after the step of terminating data transmission is performed; receiving a second closed loop power control command from the base station, the second closed loop power control command requesting a decrease in transmission power of the mobile station transmitter; determining in the mobile station if the decreased transmission power, assuming that data transmission through at least one previously terminated supplemental code channel is resumed, will not exceed the output power limit of the mobile station; if so, resuming data transmission through at least one previously terminated supplemental code channel by first transmitting a message from the mobile station to the base station over the resumed supplemental code channel for indicating that transmission is being resumed through the at least one previously disabled supplemental data channel; and decreasing the transmission power on the fundamental data channel and any of the at least one supplemental code channel that carry data transmissions after the step of resuming data transmission is performed. 5. A method as set forth in claim 4, wherein the first step of determining uses a first output power limit of the mobile station, wherein the second step of determining uses a second output power limit of the mobile station, and wherein the first output power limit of the mobile station does not equal the second output power limit of the mobile station. 6. A mobile station for operation in limited power conditions, wherein the mobile station has an output power limit, the mobile station comprising: a transceiver for transmitting on at least one data channel to a base station at a predetermined data rate, said transceiver further for receiving a command from the base station to increase a transmission power of the transceiver and for receiving a command from the base station to decrease the transmission power of the transceiver; and, a controller coupled to the transceiver, the controller for determining if an increased transmission power of the transceiver on the at least one data channel will exceed the output power limit of the mobile station, said controller further for causing, if the increased transmission power on the at least one data channel will exceed the output power limit of the mobile station, the transceiver to reduce the data rate by reducing data transmission through at least one of the at least one data channel and, causing the transceiver to increase the transmission power on any of the at least one data channel that carry data transmissions after the data rate is reduced and the controller further for determining if a decreased transmission power of the transceiver, assuming that a disabled data channel were once more enabled, will not exceed the output power limit of the mobile station and causing, if the decreased transmission power will not exceed the output power limit, the transceiver to increase the data rate by enabling data transmission through at least one previously disabled data channel and decrease the transmission power on any of the at least one data channel that carry data transmissions after the data rate is decreased. 7. A method for operating a mo