38 results about "Many antennas" patented technology

This invention discloses a performance test device and a method for radio terminal, in which, the device includes: a shield box with at least one antenna connected with an analog base station/controller out of the shield box, a test instrument connected with the being tested terminal in the box to test its radio performance, which controls the signal strength emitted to the radio terminal by the analog base station/controller, so that emitted signals can be controlled artificially, besides, tested terminals can work under single or multiple nets since one or many antennas are set in the box and shields radiation to outside test equipment and personnel and shields influence to being tested terminal from outside radiation interference of outside magnetic environment to guarantee accuracy of test result.

The present invention relates to an integrated RFID card holder, cage, lid or rack and system for collecting census, inventorying, and tracking of animal cages, lids, card holders, racks, and other related equipment. Preferably, the card holder is comprised of an RF transparent material such as plastic. During operation, a RFID reader reads each integrated RFID card holder attached to an animal cage for virtually linking the cage to an animal rack in effect assigning a parking spot to each animal cage within an animal cage rack system. The integrated RFID card holder can be determined to be in a room when the Received Signal Strength Indicator (RSSI) is the highest comparing multiple reads from one or many antennas.

A compact and low-cost antenna device in which no interference occurs even when many antenna units corresponding to various systems are mounted close together in a small area, and a wireless communication apparatus including the antenna device. An antenna device includes plural antenna units mounted on a single dielectric base. A first antenna unit having a lowest fundamental frequency is disposed at a left end of a non-ground region, a second antenna unit having a highest fundamental frequency of the plurality of the antenna units is disposed at a right end of the non-ground region, and a third antenna unit having a fundamental frequency between those of the first antenna unit and the second antenna unit is disposed between the first and second antenna units. A current-density control coil is connected between a first radiation electrode and a power feeder of the first antenna unit, while a reactance circuit is disposed in the middle of the first radiation electrode. Notches may be disposed between the first radiation electrode and a second radiation electrode and between the first radiation electrode and a third radiation electrode.

An optimum weight estimating apparatus and method of a mobile station for a mobile communication system in which a base station uses closed transmit diversity technology. Conventionally, all weight vectors stored in a lookup table should be applied to an optimum weight estimator to calculate receiving power, so that the amount of calculation considerably increases when there are many antennas. To overcome this problem, the weights of the lookup table are appropriately adjusted so that the variation of the differences between two adjacent vectors can be minimized. An optimum weight is obtained using the difference vector between weight vectors, thereby simplifying the calculation of receiving power. Therefore, the power loss of the mobile station can be minimized.

This invention allows combining broadband GW(10⁺⁹ Watt), peak power to achieve MV/m(10⁺⁶ Volt/meter), and GV/m(10⁺⁹ Volt/meter), radiated E-fields, in the range of air or vacuum breakdown in the entire electromagnetic spectrum, including optical frequencies and beyond. Use of many antennas and independently triggered generators allows achieving GV/m field, while by preventing the E-field induced breakdown it provides control of peak power and energy content at targets. The achieved broadband MV/m E-field levels and energy density significantly exceed levels required for destruction of distant electronic targets; therefore this invention radically improves the effectiveness of the electromagnetic weapons. Furthermore, collimating multiplicity of MV/m beams allows reaching GV/m E-field that exceeds by orders of magnitude the air or vacuum breakdown needed for broadband plasma excitation at resonance plasma frequencies in the 300 GHz range, permitting energy efficient plasma research leading to fusion.

The invention discloses a time division ground-based MIMO landslide radar imaging method based on IFFT and mix-match pursuit, and aims to solve the problems that an existing mountain landslide monitoring field imaging method is high in data processing complexity and uses too many antennas; aiming at a multi-target imaging pseudo shadow point problem, the method introduces the mix-match pursuit algorithm, thus greatly improving the imaging quality; the method comprises the following steps: building an equivalent random sparse transmit-receive array; building an echo signal acquisition model; range direction compression treatment; azimuth compression treatment; finishing two dimension object high resolution imaging. The advantages are that the method can reduce the array quantity, can reducehardware cost, can reduce the data processing complexity, and can improve the range and azimuth resolutions.

The embodiment of the invention discloses a radio frequency structure and terminal equipment, and relates to the technical field of communication, for solving the problem that in the existing radio frequency structure, the design difficulty of antennas is relatively high due to the many antennas. The radio frequency structure comprises a radio frequency front-end module, a switch module and an antenna module. According to the structure and equipment provided by the embodiment of the invention, the antenna design difficulty can be simplified.

The invention discloses a new time space encoding method and its application in the condition of the space diversity and the time diversity. The encoding steps adopt the NXN dimension encoding to produce the array, and the linear transformation to every group of data. The array structure of the encoding is as follows: select a nonzero value in the first array; in the condition to guarantee the code symbols are not zero, the element of the NO. n array goes round an arbitrary angle to get the corresponding element of the NO. n+2 array. Every element in each one array is either completely same or is in quadrature to one another. When using the space diversity, set several antennas at the transmitting terminal, transmit the original data on the antennas alternatively after space time encoding and only use one antenna to receive at the transmitting terminal in order to get the effect of diversity. When using the time diversity, get the effect of STBC system of many antennas without increasing the number of the antennas and when the number is same as that of the STBC system, its performance is better than that of the STBC system.

Apparatus and process for determining the position and heading or attitude of an antenna array are described based on radiating sources, preferably GNSS or other such satellite positioning systems. An optimum satellite is selected and the antenna array is “null steered” by combining the phase of the received signals to calculate a null or null angle that points toward the optimum satellite. The null will determine angle for elevation toward the optimum satellite and azimuth or heading. The heading is the azimuth of the (which may be actual or calculated) projection of the null vector to the satellite onto the Earth's surface. The actual location on Earth of the antenna array can be found and the antenna array azimuth with respect to the satellite can be determined. The null angle may be measured more precisely by dithering on either side to average out noise and then averaging the angle deviations to calculate the null angle. If the attitude of the antenna array with respect to the Earth's surface is desired, a null vector to a second satellite may be generated and the intersection of the two nulls will allow the attitude of the antenna array, with respect to one or both of the satellites, to be determined. The difference between the measured attitude of the antenna array with respect to the null vector and the calculated attitude of the satellite from the GNSS signals, is the attitude of the array with respect to the Earth's surface. All viewable satellites may be used, tracked, and nulls determined for each, and many antennas if in a known pattern relative to each other can be used to make the determinations more accurate and reliable.

Provided is an apparatus for modulation in a base station with a smart antenna. The smart antenna system has many advantages that it is possible to deal with the large volume of subscribers; communication quality is increased; etc. However, the smart antenna system has disadvantages that cost is increased due to many antennas; base station transceivers have a complicated structure due to multiple antennas per base station; it is too complicated to manage resource and channel allocation; there is required compatibility with a conventional system; etc. The present invention provides an apparatus for modulation in a base station with a smart antenna, which can solve the foregoing problems by employing a modulator using a time division multiplexing method, a sector beam selector, and a TX beam former, thereby providing good compatibility regardless of a change in the number of base station sectors and the number of antennas.

The invention discloses a large-scale MISO collaborative energy efficiency sending method which achieves optimization of energy efficiency in a large-scale antenna system under the constraints of a specific signal base station total power and a signal to interference plus noise power ratio. Firstly, the duality of uplink and downlink transmission is introduced into optimization of the energy efficiency, a corresponding energy efficiency optimization target function is set, a virtual uplink problem paired with downlink transmission is introduced, the virtual uplink transmission problem is solved through GP optimization, the corresponding uplink optimization result is converted into the solution of an original downlink transmission problem, and therefore the energy efficiency transmission problem of multiple users of the downlink is resolved. By considering the particularity of the large-scale antenna system, a wave beam design and power distribution method only using large-scale fading is obtained. The method is low in calculation complexity, is easy to achieve, needs a small feedback quantity under the large-scale antenna system, and the performance is close to that of an algorithm obtaining complete channel information feedback under the condition of too many antennas.

Systems and methods are disclosed to intelligently employ antenna resources in a manner that may reduce interference between communications signals even in instances where multiple separate frequency band communications need to be supported in a vehicle of limited size. A manifold antenna system is proposed that provides a scheme and a physical construct whereby multiple individual radio receiver/transmitter units may share a limited number of transmitting and receiving antennas. The disclosed manifold antenna system is particularly adaptable to aircraft, spacecraft, vessel or vehicle applications where there is limited room for mounting a number of individual antennas as may be needed to support each radio receiver/transmitter unit in an effort to minimize an amount of interference as is conventionally caused by having transmitting antennas located in too close a proximity to receiving antennas.

This invention relates to a manufacturing method and a structure of radio RF identifying antennas, which connects one or many antennas to a plane or cubic structure by a surface process of a base plate and an ink spraying method to process antenna patterns and radio plating to let it have pliability and high inductance value.

The invention discloses a phased array radar full-link dynamic range and sensitivity test method and system. Each input signal is fed to all receiver links through an antenna coupling channel at the same time, which means that each input signal is fed to multiple antenna channels at the same time, and multiple intermediate frequency signals and multiple digital signals correspond to the input signals; the multiple digital signals are processed to finally obtain output signals, the output signals are in one-to-one correspondence with radio frequency signals generated by a signal source, and the overall dynamic range and sensitivity of the phased array radar are obtained through input and output characteristics; and each output signal is formed by digital signals of all channels so that the dynamic range and sensitivity obtained according to the input and output characteristics can reflect the overall performance of the phased array radar. According to the test method, no matter how many antenna channels are, each path of input signal corresponds to one path of output signal, the test is simple, and the test efficiency is high.

This invention discloses a method for signal emitting and receiving based on time-division duplex, setting many antennas at the basestation side and mobile station side separately, the said antennas are designed on the principle that noises received on each antenna are mutual independent, thus, the mobile station measures received signals on its own side receive antennas and selects one as the up-line emitting antenna to take it as the emitting antenna at the next up-line emitting time. The base station selects one antenna as the downstream emitting antenna from multiantenna at its side receiving signals from the mobile stations and emits signals to the mobile at the next time, increasing transmission efficiency of high speed data and getting the maximum high S/N ratio.

The design method of interference type synthetic aperture microwave radiometer solves the problem of two many antenna units and correlators required when ESTAR is used in 2-D imaging and the problem of SSR incapable of being used in earth observation. The sparse antenna array is constituted in different modes, including oscillation scan imaging, phase controlled array oscillating scan imaging and 2-D synthetic aperture imaging. Spatial frequency variance caused by gimbel in forward direction is utilized for spatial frequency conversing and visibility function sampling, and this reduces the number of physical radixes and antenna units required in this direction and is favorable to space application.