Abstract: In the disclosed system and method phase (and optionally amplitude) shifts are applied at an OFDM transmitter to resource blocks within a given slot to implement Crest Factor Reduction (CFR). The phase shifts may differ between resource blocks and are selected to reduce the peaks in the OFDM waveform. The resource block phase shifts do not affect the demodulation process when the equalization at the receiver is performed on individual blocks separately. As a result, the crest factor reduction is achieved without increasing the EVM or BER in the received signal. In addition, a computational efficient algorithm for determining the resource block phase shifts needed for CFR is disclosed.

Abstract: A two-way terrestrial antenna, employing electrical down tilt and azimuth beam adjustment capability is disclosed. Such antenna configuration allows for a variable antenna coverage footprint within designated coverage sector. To compensate for installation support structure variations the two-way antenna employs a positional sensor that can provide feedback to BTS or automatically compensate azimuth and tilt beam angles so as to provide uniform sector coverage. In particular by monitoring tri-vector gravitational inclinometer and earth magnetic field sensors, and determining correction factors for antenna tilt and azimuth beam adjustments, uniform or compensated sector coverage is provided.

Abstract: A heterogeneous network which supports multiple communication technologies (e.g., communication in accordance with multiple air interface standards) in a unified architecture can provide near-term solutions to capacity problems. Specifically, in one embodiment, a heterogeneous network that includes both macro-base cells and pico cells and that incorporates longer range wireless air interfaces (e.g., second, third, or fourth generation wireless air interface standards) and shorter range wireless air interfaces (e.g., Wi-Fi) can be provided. Such a heterogeneous network can include the coordination of security, quality of service, assessment of mobility of user equipment, authentication, provisioning systems, and location information.

Abstract: A digital phase shifter suitable for high power RF applications is disclosed. A plurality of MEMs switches selectively couple delay lines into the RF signal path providing adjustable phase shift under digital control. 90 degree hybrid combiners on either side of the MEMs switches allow two signal paths to be used in combination to provide a desired number of phase shift steps with a reduced number of delay lines and switches and with lower power level on each path.

Abstract: A system and method for dynamically optimizing the transmission power levels for downlink voice and data signal transmitted from a base station to user equipment is disclosed. The user equipment measures the strength and quality of the downlink signal, and transmits this downlink signal information to a control unit. The control unit analyzes the downlink information and employs an adaptive self-learning traffic algorithm which determines optimized power levels for the downlink signals. The control unit may optimize only one carrier signal or a subset of the multi-carrier signals in a preferred embodiment. The values of the optimized power levels are sent to the base station which then increases or decreases the downlink transmission power of one or more carrier signals based on this level. As a result, the area associated with dead spots is reduced and the quality of the downlink signals is enhanced.

Abstract: An antenna architecture with enhanced emission directivity is disclosed. The antenna comprises a dielectric structure positioned over a plurality of radiator elements. The dielectric structure comprises columns of dielectric disks positioned above each radiator element. The antenna is driven by beam forming networks to form multiple, simultaneously steerable beams or a single main beam that can be dynamically steered.

Abstract: A reduced cost method for the measurement and correction of residual nonlinearities in a digitally predistorted transmitter is disclosed. Systems employing predistorters and power amplifiers are calibrated by processing actual input and output signals during the normal operation of the systems. The systems correct memoryless nonlinearities as well as both memoryless and memory based nonlinearities.

Abstract: An antenna architecture containing a broadband resonant cap positioned over a radiating patch is disclosed. The resonant cap consists of a rectangular resonant patch at the center with parasitic patches in close proximity of the four edges of the resonant patch. The parasitic patches may be coplanar with the resonant patch or may be mounted at an angle with respect to the vertical axis of the resonant patch. The resonant cap reduces the HPBW of the emitted radiation and improves emission directivity.

Abstract: An antenna adapted for wireless networks and having a variably controlled stagger antenna array architecture is disclosed. The antenna array contains a plurality of driven radiating elements that are spatially arranged having each radiating element or element groups orthogonally movable relative to a main vertical axis so as to provide a controlled variation of the antenna array's azimuth radiation pattern.

Abstract: The invention relates to a structure comprising an enclosed antenna system, and a radome (18), where the structure comprises: a tower (B, C), comprising a main tube (2) fastened on a bottom flange (7) of the tower (B, C), a smaller-diameter tube (5) which hooks within the main tube (2) and further is fastened on an upper flange (8) of the tower (B, C), a nut (6) fastened on the other end of said smaller-diameter tube (5), a rod (3) which screws on within the nut (6), a shaft (4) fastened at the bottom part of the rod (3) and terminating in a nut (1), where the radome (18) is fastened on the upper flange (8) of the tower (B,C), thus making it possible to check the antennas mounted on the main tube (2) by that when screwing the nut (1), the radome (18) is arranged to move upwards, making the bottom of the antenna system accessible.

Abstract: An improved vault that facilitates the underground storage of electronic equipment, such as instrumentation for wireless telecommunications antenna systems. The vault preferably includes an flood evacuation system that prevents the electronic equipment from being submerged under water when the vault floods, a break-away lid to reduce or minimize injury, and a grated lid to prevent water from entering the main equipment chamber.

Abstract: A low loss beam forming method and antenna structure are disclosed. The method and structure may preferably be used in forming two narrow beams within a cellular sector. This method allows an increase in the overall network capacity by using a three-column non-planar array and a compact, low-cost, low-loss 3-to-2 Beam-Forming Network (BFN). This structure produces two symmetrical beams with respect to the azimuth boresight. Radiation patterns of the two beams are designed to cover the entire azimuth coverage angle of a cellular sector with minimum beam-split loss and cross-over losses.

Abstract: A coupling loop with each leg connected by two resistors, R1 and R2 going to ground on a disk shaped printed circuit board provides a directional coupler with directivity tuned by rotating this disk assembly and coupling controlled by the distance to the main RF transmission line. Once the desired level of directivity is obtained, this board is locked with screws from the top.

Abstract: The present invention provides an omni-directional antenna element configuration having a compensated radiation pattern. Broadband antenna elements are coplanarly disposed on a suitable planar dielectric material. A single element omni-directional antenna comprises a pair of balanced fed radiating microstrip elements symmetrically disposed about the centerline of a balanced signal feed network. Additionally, a pair of pattern augmentation rods are positioned on each side of and proximate to the planar dielectric material running longitudinally to the centerline axis of a balanced feed network. Disposed proximate to each radiating element are partially coplanar, frequency bandwidth expanding microstrip lines. The combination of radiating elements together with pattern augmentation rods provides a broad bandwidth omni-directional radiating element suitable for use in multi-element antenna arrays.

Abstract: A Time Division Duplexed (TDD) digital distributed antenna system (DDAS) that performs simulcast distribution to multiple simulcast groups while using TDD time advanced burst to negate the data rate reducing effects of transport delays. The User Plane data is adapted for eliminating time delay ambiguities across multiple simulcast digital radios. In addition, the Control and Management Plane is aggregated across multiple remote units to allow a non-modified donor digital base station to control simulcast groups.

Abstract: A wireless repeater includes an internal feedback path for adaptively cancelling an echo between an output antenna and an input antenna. The internal feedback path employs an adaptive algorithm implementing a list having a plurality of list elements. Each list element has one or more echo cancellation parameters and one or more repeater settings. The list may be pruned by employing a minimum distance between elements within the list. A method for stabilizing a wireless repeater includes obtaining an autocorrelation of a signal in a signal path of the repeater, detecting an echo in the signal path based on the autocorrelation, providing a list of elements indicating past successful echo cancellation coefficients and associated repeater settings, and adaptively adjusting an error of the echo cancellation coefficients to cancel the echo in the signal path.

Abstract: An amplifier unit to be placed in an antenna mast and belonging to a two-way radio system. The amplifier unit comprises two front stages for implementing diversity, each front stage comprising a receiving branch with an amplifier and a transmitting branch including a transmit bandpass filter. In both front stages the output of the receiving branch and the input of the transmitting branch are coupled together and further to a base station (BT1, BT2) by an intermediate cable. There is at least one pair of antenna radiators. One radiator of the pair is coupled to the input of the receiving branch of the first front stage and the output of the transmitting branch of the second front stage, and the other radiator to the input of the receiving branch of the second front stage and the output of the transmitting branch of the first front stage. Then, the feedback path of the signal amplified in the receiving branch circulates for the part of both front stages via both radiators and the airspace.