Abstract: A wireless office communication system including a wireless internet base station (WIBS) encompassing a base station controller, a mobile switch controller and an ethernet interface module for coupling the WIBS to an existing internet protocol (IP) based network. A wireless office communication system can also be based on the conventional architecture comprising the BTS, BSC and MSC. The WIBS or BTS is attached to a number of antennas via different and identifiable delay elements for the purpose of determining the serving antennas of mobile communication units. A location determination logic enables the system to handle handoffs between a WIBS or BTS and the external public communication system in an optimum manner.

Abstract: A wireless office communication system including a wireless internet base station (WIBS) encompassing a base station controller (BSC), a mobile switch controller (MSC), and an ethernet interface module for coupling the wireless internet base station (WIBS) to an existing internet protocol (IP) based network. A wireless office communication system can also be based on the conventional architecture comprising the base station transceiver subsystem BTS, BSC, and MSC. The WIBS or BTS is attached to a number of antennas via different and identifiable delay elements for the purpose of determining the serving antennas of mobile communication units. A location determination logic enables the system to handle handoffs between a WIBS or BTS and the external public communication system in an optimum manner.

Abstract: A wireless office communication system including a wireless internet base station (WIBS) encompassing a base station controller (BSC), a mobile switch controller (MSC), and an ethernet interface module for coupling the wireless internet base station (WIBS) to an existing internet protocol (IP) based network. A wireless office communication system can also be based on the conventional architecture comprising the base station transceiver subsystem BTS, BSC, and MSC. The WIBS or BTS is attached to a number of antennas via different and identifiable delay elements for the purpose of determining the serving antennas of mobile communication units. A location determination logic enables the system to handle handoffs between a WIBS or BTS and the external public communication system in an optimum manner.

Abstract: A wireless office communication system including a wireless internet base station (WIBS) encompassing a base station controller, a mobile switch controller and an ethernet interface module for coupling the WIBS to an existing internet protocol (IP) based network. A wireless office communication system can also be based on the conventional architecture comprising the BTS, BSC and MSC. The WIBS or BTS is attached to a number of antennas via different and identifiable delay elements for the purpose of determining the serving antennas of mobile communication units. A location determination logic enables the system to handle handoffs between a WIBS or BTS and the external public communication system in an optimum manner.

Abstract: A telecommunication base station transceiver subsystem that can be easily configured to provide single or multi-carrier frequency service. Capacity is increased and diversity reception is maintained from a single to a dual frequency system without the need for additional antennas. The base station is divided into a main unit and a radio unit such that the radio unit is positioned proximate to the antennas and the main unit is remotely located from the radio unit. Furthermore, a single base station transceiver can provide service via multiple wireless protocols, such as CDMA, TDMA, GSM or Analog. The base station transceiver can also operate on various transmit/receive frequencies as well as variable transmit power settings.

Abstract: A digital feedforward (FF) amplifier system is disclosed for use in an RF transmission system. The digital FF amplifier uses digital signal processing to generate error correction signals that reduce intermodulation distortion caused by saturation of the main power amplifier. The digital signals in the improved FF amplifier may be buffered, if necessary, thereby eliminating the need for delay lines. A main amplification branch includes a digital combiner for summing input digital signals, digital-to-analog converters, RF modulation circuitry and a main power amplifier. An error correction signal branch includes an error correction signal generator, digital-to-analog converters, and RF modulation circuitry. The RF outputs of the main amplification branch and the error correction signal branch are combined to produce an RF output signal with reduced distortion. Optionally, an amplifier characterization branch may be included comprising RF output feedback circuitry and an amplifier model.

Abstract: There is disclosed, for use in a wireless network, a single-loop feedforward amplification system. The single loop comprises a main amplification branch and a feedforward branch in parallel to the main amplification branch. The main amplification branch contains a delay line that receives and delays the initial low-power input signal, and a power amplifier that amplifies the delayed input signal to produce an amplified output signal. The feedforward branch also receives the input signal and generates an distortion correction signal to compensate for the distortion produced at the output of the power amplifier due to its non-linearity. The distortion correction signal and the distorted amplified output signal are then combined to create a corrected amplified output signal without distortion.

Abstract: A cellular radio-telephone system has a plurality of cells each of which has S sectors. The cells are grouped into a plurality of clusters each of which has N adjoining cells. Each cell has a set of assigned system frequencies with respective frequency subsets assigned to its sectors so that N groups of co-channel cells exist with each co-channel cell group including one cell from each cluster having channel frequencies corresponding to those for its co-channel cell group. Respective base station antennas are located in the respective sectors of the respective cells, and each of the cell sectors has a plurality of subscriber station directional antennas disposed at predetermined locations within the sector for communication linkage with the associated base station antenna. The cells are generally formed in rows and columns and further are formed to provide a predetermined relative orientation pattern for co-channel cell sectors.

Abstract: An interdigital resonant cavity filter structure is foled to provide two adjacent chambers physically positioned side by side and electrically connected in series with each other. A center plate divides the two chambers with a slot at one end of the structure to permit the two chambers to function as one resonant cavity in a folded relation to each other. Each chamber includes interdigital resonators which are related to the overall resonant cavity to produce a band pass filter action within the folded resonant cavity. The input of the filter structure is applied through a port of a circulator connected to one end of the resonant cavity and the output is taken from another port of the circulator. The opposite end of the resonant cavity is terminated in the characteristic impedance of the resonant cavity thereby causing the overall structure to operate as a high quality notch filter.