Abstract: A method for controlling alignment of a control loop in an amplifier system includes generating a pilot signal and injecting the pilot signal into the amplifier system. Any uncanceled pilot signal is detected at an output of the control loop. A frequency of the generated pilot signal is detected and is used in adjusting one or more parameters of the control loop. The adjusting is performed at a predetermined direction and with a predetermined step size. A frequency change in the pilot signal in response to the adjusting is detected. The control loop is iteratively aligned by controlling the adjusting based on the detected frequency change, and the step size is determined based on the detected frequency change.

Abstract: An antenna system for wireless networks having a dual stagger antenna array architecture is disclosed. The antenna array contains a number of driven radiator elements that are spatially arranged in two vertically aligned groups each having pivoting actuators so as to provide a controlled variation of the antenna array's azimuth radiation pattern.

Abstract: The present invention provides a remote antenna system employing digital imaging means by which the operator can view both the antenna pointing data and the coverage landscape from the antenna radome perspective. The present invention also provides a method for antenna positioning data acquisition and positioning control employing remotely acquired image data.

Abstract: A broad beam width antenna array, preferably having 360 degrees of azimuth coverage, which also has broad frequency bandwidth, for use in a wireless network system is disclosed. In a preferred embodiment the antenna array comprises a planar dielectric substrate, micro strip elements on both sides of the dielectric substrate, and a corporate feed structure employing parasitic conductive beam width enhancing tubes as feed line conduits. The antenna array comprises dipole radiating elements formed on both sides of the dielectric substrate and a balanced feed network feeding each dipole arm. The shape of the dipole is symmetric and the overall structure, including feed network, preferably has a ?-shape when viewed from either side of the dielectric substrate. Disposed proximate to each dipole arm are bandwidth enhancement coplanar micro strips which are parallel to each dipole arm and at least partially overlapping each other.

Abstract: In a Mobile Ad Hoc Network (MANET), each node calculates a bandwidth output value representative of data output requirements for the node relative to the transmit time slots available to the node. This value is shared with other nodes in the MANET and may be employed to more efficiently allocate channel usage among nodes as traffic demands and network topology change.

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: In a Mobile Ad Hoc Network (MANET), multi-metric information is gathered and applied to a cost-based route calculation. In particular, each node gathers resource metrics from neighboring of nodes, along with data rate and reliability information for data links to and from the node. This information is applied to a costing algorithm such as Dykstra' Open Shortest Path First algorithm to obtain routes through the network. This approach may be adapted with suitable modifications to use with unicast traffic or with a multicast forwarding group.

Abstract: A wireless communication system and method comprising co-location of a pico evolved node B (“eNB”) and a macro up-link repeater is disclosed. User Equipment (“UE”) communicates with a macro eNB via the up-link repeater with reduced transmission power as compared to the transmission power required for the UE to communicate directly with the macro eNB. As a result, the UE does not desensitize the pico eNB receiver. The up-link repeater comprises a donor antenna that radiates a highly directional beam to the macro eNB.

Abstract: The present invention relates to a device for adjusting the beam direction of a beam radiated from a stationary array of antenna elements. Antenna element feed points are coupled to a common source via a feed line structure having a source connection and feed connection terminals to be connected to the antenna element feed points, the feed line structure being at a distance from and in parallel to a fixed ground plane. A movable element is located adjacent to the feed line structure to change the signal phase of signal components being transferred between the source connection and the respective feed connection terminals. The movable element is movable for effecting a phase shift of the signal components to adjust the beam direction. The device is provided with a detection arrangement for detecting the absolute position of the movable element.

Abstract: A system and method for providing a peak power reduced OFDM communications signal are disclosed. The system and method provide peak reduction processing in the time domain followed by inter-symbol interference (ISI) control processing in the frequency domain to maintain modulation errors introduced by the peak reduction processing to an acceptable level. The processing is preferably done on a parallel signal path and the peak corrections with ISI control are added into the main signal path to provide the peak reduced OFDM signal.

Abstract: An arrangement for electronically steering a radiation lobe of an antenna. Radiators of the antenna are located in a row and two radiators, which are equidistant from a midpoint of the row, form a radiator pair. To steer the radiation lobe, each pair is associated with a reflection-type phase shifter, implemented by a shared transmission line and reflection point, which can be moved. Phase changes take place by moving the reflection point along the transmission line using one movable or several fixed reflection circuits. The phase adjusting for all radiator pairs in a row is implemented simultaneously by a common control circuit. In the former case the reflection circuits of the different transmission lines are slides attached to one and the same movable arm. In the latter case one of the reflection circuits of each transmission line is activated at a time.

Abstract: An antenna for receiving and/or transmitting electromagnetic signals is disclosed. The antenna includes a ground plane with a length and having a vertical axis along the length, and a dipole radiating element projects outwardly from a surface of the ground plane. The radiating element includes a feed section, and a ground section.

Abstract: A low cost and multi-featured antenna is disclosed. The antenna employs a radiating element mounted to a ground plane and having first and second branches spaced above the ground plane forming a generally L shaped planar radiating structure. The antenna can be either linear or circular polarization, and can be either single band or dual band, and only one feeding port is needed to obtain circular polarization. The antenna can be easily applied to various frequency bands.

Abstract: A directional coupler (500), which comprises a dielectric substrate (501) on top of a metal plate (510), is functioning as a ground plane. The transmission path is a suspended stripling so that there is a recess on the ground plane below the transmission conductor (520) being on the surface of the substrate. The sensing conductor (530) is a very small-sized conductive strip on the surface of the substrate. It has been connected from its head end to the measurement port (P3) and from its tail end via a termination resistor (550) to a small ground strip (515). The ground strip is next to the sensing conductor on the side of the output port (P2) of the directional coupler. With such an asymmetric structure, some directivity is obtained despite the small size of the sensing conductor. Also below the sensing conductor (530) there is a recess (506) on the ground plane, which joins the recess below the transmission conductor (520).

Abstract: The present invention relates to an antenna arrangement connectable to a transceiver for transmitting and receiving RF signals in at least two separate frequency bands. The antenna arrangement has at least two sets of antenna elements arranged on a reflector, and the antenna elements are arranged in an interleaved configuration along a single column. The two separate frequency bands are substantially non-overlapping but relatively close to each other, and the distance between adjacent antenna elements in said column is substantially the same along the column.

Abstract: The invention relates to a bypass device for a microwave amplifier unit, the microwave amplifier unit (1) comprising at least one low noise amplifier (LNA) and amplifying communication signals in at least one microwave frequency band above 500 MHz, the bypass device extending in parallel to said microwave amplifier unit (1), both extending between an input port (3) and an output port (4), in which amplifier unit (1) switching elements (9,10,16,21) for activating said bypass segment (2) in a bypass mode of the device in case said amplifier unit (1) becomes inoperable and for effectively blocking the bypass segment (2) in an active mode of the device are arranged, said bypass segment comprising a series of bypass segment sections (14,19,17) having at least one junction point connected to an associated one of said switching elements (16,21), where each of said bypass segment sections (14:19:17) comprises at least two coupled transmission lines (31,32;31,33,32;31,34,32:51,52;51,53,52:41,42;41,43,42;41,44,42), whe

Abstract: In one aspect, a method to schedule network communications in a network having nodes connected by links includes sending a bandwidth value of a first node for each link connected to the first node to neighbors of the first node, receiving bandwidth values from the neighbors of the first node; and determining node weight values of the first node and the neighbors of the first node based on the bandwidth values received from the neighbors of the first node and the bandwidth value of the first node. The method also includes sending the node weight values of the first node to the neighbors of the first node, receiving the node weight values from the neighbors of the first node, determining access values for each node based on a fair access technique and determining network scheduling based on the access values and the node weight values.

Abstract: In one aspect, the invention is a multichannel receiver. The multichannel receiver includes a first channel circuit of N channel circuits. The first channel circuit includes a band pass (BP) filter and a gain control (GC) feedback circuit configured to adjust a signal provided by the BP filter with respect to a reference voltage.

Abstract: Establishing communications between a plurality of nodes includes determining a set of frequencies to search for neighbor nodes, and performing an adaptive control channel initialization operation to detect zero or more neighbor nodes. If one or neighbor nodes are detected, an adaptive control channel with one or more of the one or more detected neighbor nodes is established.

Abstract: A predistortion linearized amplifier system that uses analog polynomial based predistortion is disclosed. An analog polynomial function generator receives polynomial parameter updates from a polynomial parameter generator. The polynomial parameter generator uses a combination of analog and digital signal processing to create the parameter updates. This processing is performed on input signal amplitude, detected using analog circuits, and RF coupled samples of the input signal, and the output signal. By using a combination of analog and digital signal processing means, digital processing can be performed at sub-Nyquist rates, significantly reducing the cost of digital circuits. Also, since the predistortion modulation signal is created with an analog function generator, time correlating delay is minimized reducing circuit costs.