MICRONETICS 217 GENERAL-PURPOSE SWITCH DRIVER

Another desirable characteristic for a calibration method is the ability carry out rapid calibration even several times during an existing call. Radio equipment, transmission reception directivity control method, and transmission reception directivity control program. Calibration factors for each antenna element are determined as a function of the associated transmit electronics chain and receiver electronics chain transfer functions. Thirdly, the transfer characteristics of the RP electronics depend on changing ambient conditions such as temperature and humidity which make it essential that antenna arrays be repeatedly calibrated in their ambient environment. Note that in general the beam pattern of the antenna array depends on the weight vectors, as well as on the transfer functions of the RF electronics.

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Any subscriber unit implemented signal quality determining method may be used, and the method and apparatus for determining signal quality used in the preferred embodiment is the kurtosis based method disclosed in above referenced U.

Systems and methods for simultaneous sampling of serial digital data streams from multiple analog-to-digital converters ADCSincluding gensral-purpose distributed antenna systems. The stored version is stored in a buffer formed in memory When used for two-tone calibration see belowthe transmitted calibration waveforms are appropriately modulated sine waves, and in the preferred embodiment, to preserve memory, only a single period of each sine wave is stored in memory []that section of memory configured as a circular buffer.

For receive calibration, a known input signal is generated and injected using a calibration network a passive distribution network into each antenna element of the antenna array.

In addition, the base station needs to enter a spatial calibration mode for carrying out the calibration experiment, and thus cannot be used for any other purpose during that time.

General Purpose Limit Switches - Honeywell

Different protocols may be designed for other implementations. In addition to producing the symbol sequencedemodulation and reference signal generator also produces a reference signal which is a modulated signal that is modulated by the estimated symbols and that has a correct signal structure according to the particular modulation protocol used. Another feature of the invention is enabling determining the uplink spatial signature of gendral-purpose subscriber unit communicating with a communication station, the determining using only the communication station and the subscriber unit.

The PHS protocols are incorporated herein by reference. Another feature of the invention is providing a calibration method and apparatus that can be readily implemented in a radio frequency system and that make it practical to perform frequent and routine system calibration, the calibration enabling the use of a calibrated transmit weight vector, the transmit weight vector essentially determined from a receive weight vector, the calibration including correcting for differences in electronic paths and for differences in RF propagation effects.

Wide inventory, custom solutions, flexible rental terms. For example, one can use a subset of the hardware and software included in swwitch subscriber unit to carry out the calibration.

We sell both new and quality used RF-microwave communication parts. Normal traffic functions depend on the air interface, and may include demodulation, timing and frequency tracking, and various control functions such as power control and handoff.

In an FDD system the relation between the uplink and downlink propagation factors may be more complicated, and can still be determined. In order generaal-purpose estimate the downlink channel, the base station [] transmits one or more downlink calibration bursts towards subscriber unit The downlink signature related signals computed at the subscriber unit, which preferably are the signature estimates, are then transmitted to the base station.

Determining this calibration information is the main goal of the present invention.

Micronetics general-purpose switch driver and art blakey les liaisons dangereuses

On the downlink, signals from the subscriber units are received micronetica the antenna array. Estimate the uplink channel spatial signature a [] rx. In such a case, one needs to be able to determine the uplink and downlink spatial signatures.

In such a case, the signature and all its components similarly would be defined in that frequency band. Most known methods require external measuring equipment which may be expensive, unwieldy and cumbersome to use repeatedly.

National Test Equipment Oceanside, CA New, used, and reconditioned electronic test and measurement equipment sales, rentals, leasing, repair, and calibration. The main purpose of the calibration process is to determine calibration vector [] for a base station and one of its subscriber units which supports the calibration procedure.

In one version of the Parish et al.

Individualized gain control of uplink paths in remote units swjtch a distributed antenna system DAS based on individual remote unit contribution to combined uplink power. In the two-tone methods described herein above, this step is performed preferably by carrying out the first correlation step of the calibration method.

Several features of Wachs' system are of note. The system separately calibrates forward and return link phased array antennas on a phased array antenna communication station which is micrpnetics a satellite. Such propagation effects include without limitation path loss, fading and shadowing effects, multipath, and near-field scattering.

General Purpose Limit Switches

The method of claim 23wherein there are M antenna elements, the first set of linear combinations being a sum of M distinct tone signals being transmitted from the reference antenna element, and none of the tone signals being transmitted from the other transmit antenna elements, the frequencies of the tone of the distinct tone signals being distinct, the second set of linear combinations being a different one of the tone signals being transmitted from each of the antenna elements, the frequencies of the tones from distinct arrays being distinct, processing to determine the downlink signature related signals and the downlink signature determining together comprising: The bursts are received in the subscriber unit e.

The antenna elements may then be adjusted in amplitude and phase, or in-phase I and quadrature Q components using the correction factors so as to ensure that each element is properly calibrated during transmission.

In the preferred embodiment the set of transmit weights is computed directly from the set of receive weights generated by receive signal processorand the computation is carried out by transmit weight generator in real time. The preferred siwtch is in a system that operates using the Personal Handyphone PHS air interface communication protocol.