Abstract: A base transceiver station including a transceiver unit is provided. A method of calibration uses a transceiver unit to receive an RF signal, measure a calibration value, and transmit the measured value. The calibration value is used to determine weighting parameters to compensate for relative RF path phase delay and amplitude variation.

Abstract: A base transceiver station including a transceiver unit is provided. A method of calibration uses a transceiver unit to receive an RF signal, measure a calibration value, and transmit the measured value. The calibration value is used to determine weighting parameters to compensate for relative RF path phase delay and amplitude variation.

Abstract: A method for calibration of RF paths of a frequency hopping adaptive base transceiver station is provided. The method of calibration calibrates a wireless cellular telecommunication system with a frequency hopping adaptive base transceiver station including an adaptive antenna array with two or more RF traffic transceiver apparatus chains. The wireless cellular telecommunication system communicates with mobile units on a frequencies defined by a hop list. The method of calibration includes the step of periodically interrupting a frequency hopping process of the frequency hopping adaptive base transceiver station while calls are in progress. The method of calibration further includes the step of calibrating an antenna transmit path for a RF traffic transceiver apparatus chain at a frequency selected to include one or more frequencies in the hop list to determine a set of weighting parameters for the antenna transmit path at the one or more frequencies.

Abstract: A method for calibration of RF paths of a frequency hopping adaptive base transceiver station is provided. The method of calibration calibrates a wireless cellular telecommunication system with a frequency hopping adaptive base transceiver station including an adaptive antenna array with two or more RF traffic transceiver apparatus chains. The wireless cellular telecommunication system communicates with mobile units on a frequencies defined by a hop list. The method of calibration includes the step of periodically interrupting a frequency hopping process of the frequency hopping adaptive base transceiver station while calls are in progress. The method of calibration further includes the step of calibrating an antenna transmit path for a RF traffic transceiver apparatus chain at a frequency selected to include one or more frequencies in the hop list to determine a set of weighting parameters for the antenna transmit path at the one or more frequencies.

Abstract: A spectrally efficient wireless communication system that includes a plurality of base stations communicating indirectly with a plurality of wireless communications devices through a plurality of repeaters. The method can generally comprise communicating indirectly between a first base station and a wireless communication device using a first repeater and a first RF backhaul link. A control processor associated with the first base station can control a first smart antenna system. The system selectively configures the first smart antenna system to spatially isolate communications on the first RF backhaul from communications on a second RF backhaul of a second repeater.

Abstract: A method (100) for amplitude equalization in transmit and receive levels in a base station wideband transceiver (50) includes the step of assigning (102) a plurality of transmit and receive carrier frequencies to the base station wideband transceiver and the step of flattening (104) the power in the plurality of transmit and receive carrier frequencies in the plurality of base wideband transceivers using software amplitude pre-distortion.

Abstract: A spectrally efficient wireless communication system that includes a plurality of base stations communicating indirectly with a plurality of wireless communications devices through a plurality of repeaters. The method can generally comprise communicating indirectly between a first base station and a wireless communication device using a first repeater and a first RF backhaul link. A control processor associated with the first base station can control a first smart antenna system. The system selectively configures the first smart antenna system to spatially isolate communications on the first RF backhaul from communications on a second RF backhaul of a second repeater.

Abstract: Apparatus and method to perform the real-time correction of differential non-linearities in a broadband wireless transceiver system using a digital look-up table. Initially, the values for the digital look-up table are determined prior to full operational use of the broadband transceiver system. The one set of values represents inverse response of the transfer function of the D/A converter. The other sets of values represents the inverse response of the transfer function for each A/D converter. The inverse response values for the D/A and A/D converters are stored in a non-volatile memory. During initialization of the broadband transceiver system, the values of the inverse response of the transfer function for the D/A converter are transferred from the non-volatile memory to a high speed memory. The values of the inverse response of the transfer function for each A/D converter is also transferred to another set of high speed memory.

Abstract: A method (100) for amplitude equalization in transmit and receive levels in a base station wideband transceiver (50) includes the step of assigning (102) a plurality of transmit and receive carrier frequencies to the base station wideband transceiver and the step of flattening (104) the power in the plurality of transmit and receive carrier frequencies in the plurality of base wideband transceivers using software amplitude pre-distortion.

Abstract: A method and apparatus for calibration of an adaptive antenna array in a wireless communication system having at least one remote device for communicating with a base transceiver station (BTS) and a plurality of mobile stations can determine calibration factors for respective antenna transmit and receive paths without the need for any additional or external equipment for calibration. Calibration factors for respective transmit and receive paths associated with each of the antenna elements are determined by transmitting a downlink signal from the BTS to the remote device from each of the antenna elements, retransmitting from the remote device the downlink signals back to the BTS as at least one uplink signal, and receiving the uplink signal at the BTS.

Abstract: The invention discloses a method and apparatus for supporting increased capacity on a backhaul communications link carrier frequency of a wireless communication system the uses a repeater station. Uplink RF carrier signals from a plurality of mobile units each having a first modulation scheme, are received at a serving repeater station. These uplink signals containing traffic and control information are demodulated and then re-modulated by a second modulation scheme having a higher-order modulation than the first modulation scheme. The re-modulated signal containing a plurality of uplink carrier signals within a single RF carrier signal is then transmitted over an uplink channel of a backhaul communication link. Additionally, the invention discloses a method for aggregating data on the uplink channel of a backhaul communications link. A plurality of uplink RF carrier signals from a plurality of mobile units are each received at a repeater station.

Abstract: A method (150) of automatic gain control on a time slot by time slot basis in a base transceiver station (115) includes the steps of measuring (152) and storing (158) an amplitude of a signal on a given time slot for a predetermined number of prior time frames. Then, an appropriate gain adjustment factor for the given time slot is determined (166) and applied (168) to a received signal in a current time slot of the given time slot. Such application of the gain adjustment factor is applied on a time slot by time slot basis.

Abstract: A fluid purification system includes an elongated ultraviolet radiation emitting tube and independent fluid flow-controlling conduits. Each conduit is transparent to allow ultraviolet light emitted by the tube to enter the conduit, and defines a continuous path, and is helically wound closely about the tube to insure that fluid flow through the conduits is exposed to the ultraviolet light. One embodiment of the system includes a filter typically a carbon filter, having inlet and outlet ports. An end of each conduit is connected to one of the inlet and outlet ports of the filter. The system thus exposes the fluid to ultraviolet radiation both before and after the fluid is filtered. Other embodiments include reverse osmosis units and deionization units wherein each entry, exit or discharge port is isolated from contamination by having a coiled connecting tube for the fluid exposed to ultraviolet radiation.

Abstract: A fluid purification system includes an elongated ultraviolet radiation emitting tube and independent fluid flow-controlling conduits. Each conduit is transparent to allow ultraviolet light emitted by the tube to enter the conduit, and defines a continuous, and is helically wound closely about the tube to insure that fluid flow through the conduits is exposed to the ultraviolet light. The system includes a filter having inlet and outlet ports. An end of each conduit is connected to one of the inlet and outlet ports of the filter. The system thus exposes the fluid to ultraviolet radiation both before and after the fluid is filtered.

Abstract: A fluid purification system includes an elongated ultraviolet radiation emitting tube and independent fluid flow-controlling conduits. Each conduit is transparent to allow ultraviolet light emitted by the tube to enter the conduit, and defines a continuous, aand is helically wound closely about the tube to insure that fluid flow through the conduits is exposed to the ultraviolet light. The system includes a filter having inlet and outlet ports. An end of each conduit is connected to one of the inlet and outlet ports of the filter. The system thus exposes the fluid to ultraviolet radiation both before and after the fluid is filtered.

Abstract: A spectrally efficient wireless communication system that includes a plurality of base stations communicating indirectly with a plurality of wireless communications devices through a plurality of repeaters. The method can generally comprise communicating indirectly between a first base station and a wireless communication device using a first repeater and a first RF backhaul link. A control processor associated with the first base station can control a first smart antenna system. The system selectively configures the first smart antenna system to spatially isolate communications on the first RF backhaul from communications on a second RF backhaul of a second repeater.

Abstract: A method (100) for amplitude equalization in transmit and receive levels in a base station wideband transceiver (50) includes the step of assigning (102) a plurality of transmit and receive carrier frequencies to the base station wideband transceiver and the step of flattening (104) the power in the plurality of transmit and receive carrier frequencies in the plurality of base wideband transceivers using software amplitude pre-distortion.

Abstract: A spectrally efficient wireless communication system that includes a plurality of base stations communicating indirectly with a plurality of wireless communications devices through a plurality of repeaters. The method can generally comprise communicating indirectly between a first base station and a wireless communication device using a first repeater and a first RF backhaul link. A control processor associated with the first base station can control a first smart antenna system. The system selectively configures the first smart antenna system to spatially isolate communications on the first RF backhaul from communications on a second RF backhaul of a second repeater.