132 results about "Antenna correlation" patented technology

The unmanned aerial vehicle for antenna radiation characterization is an unmanned aerial vehicle having a propulsion system and a transceiver. Control signals are transmitted from a base station to position the unmanned aerial vehicle adjacent an antenna of interest. The unmanned aerial vehicle for antenna radiation characterization further includes a signal strength antenna for receiving an antenna signal generated by the antenna of interest for calculating or determining the received signal strength of the antenna signal. A received signal strength signal is then transmitted back to the base station, in real time. The received signal strength signal is representative of a set of received signal strengths of the antenna signal corresponding to a set of three-dimensional measurement coordinates such that the received signal strength signal represents a three-dimensional radiation pattern associated with the antenna of interest.

A method is provided of transmitting signals from two or more antennas in a wireless telecommunications network, in which at least one data sequence is space-time block encoded. Before transmitting the data sequence, a linear transformation is applied to the data sequence, the linear transformation being adapted to use knowledge of correlation among the antennas to at least partially compensate the transmitted signals for said correlation. The linear transformation depends on the eigenvalues of an antenna correlation matrix. The linear transformation further depends on a ratio of symbol energy (E_s) to noise variance (σ²). The method includes transmitting the encoded and transformed data sequence.

The invention provides a data transmission solution in a telecommunication system. According to the invention, a data transmission scheme is selected for a first transceiver unit, which comprises a plurality of transmit antennas, on the basis of the quality of a communication link and transmit antenna correlation information associated with the first transceiver unit, from a list including at least the following data transmission schemes: transmitting different data from each antenna of the first transceiver unit, the data transmitted from one antenna being independent of the data transmitted from another antenna; and transmitting the same data from each antenna of the first transceiver unit and controlling the direction of the transmitted data according to the properties of a radio channel. The selection of the data transmission scheme is carried out during an active communication link between the first and a second transceiver unit.

A method for antenna subset selection by joint processing in RF and baseband in a multi-antenna systems. L_t input data streams are generated in a transmitter for either diversity transmission or multiplexing transmission. These streams are modulated to RF signals. These signals are switched to the t branches associated with the t transmit antennas, and a phase-shift transformation is applied to the RF signals by a t×t matrix multiplication operator Φ₁, whose output are t≧L_t RF signals. These signals are transmitted over a channel by t antennas. The transmitted signals are received by r antennas in a receiver. A phase-shift transformation is applied to the r RF signals by a r×r matrix multiplication operator Φ₂. L_r branches of these phase shifted streams are demodulated and further processed in baseband to recover the input data streams.

A translating bi-directional packet repeater includes a first antenna and a second antenna for receiving a wireless signal, amplifying it, and retransmitting it on a different channel. The channel associated with each of the antennas is separated in frequency sufficiently to ensure good isolation between the wireless signals that are received and then retransmitted. The wireless signal is down converted to an intermediate frequency (IF) that is passed through a band pass filter, and the filtered signal is then up converted and retransmitted on the different channel. A controller responds to a wireless signal on one of the antennas in selecting a path through the bi-directional amplifier and the antennas used to receive and retransmit the signal. The isolation between the received wireless signal and the retransmitted wireless signal is sufficient to avoid interference, and the retransmission takes place almost instantaneously to minimize the delay incurred.

A combined SAIC receiver and a multiple-antenna, receive diversity receiver are employed to reduce interference in a wireless system. The real and imaginary parts of the de-rotated signal for each receive path associated with an antenna are separately filtered and a combined output signal of all receive paths is generated. The weighting coefficients are adjusted based on an error signal produced by comparing the combined output signal with a reference signal. The weighting coefficients are initially set based on an MMSE/LS type of signal processing criteria, where the reference signal is the Training Sequence Code (TSC). Subsequent adjustment/tracking can be accomplished by using known tracking algorithms, e.g. LMS or RLS, or the coefficients can be re-computed using MMSE/LS processing. The reference signal for tracking may be a combination of the TSC and estimated data symbols provided by an equalizer.

There is described a gateway including an electronic card (4) and a multi-antenna system integrated in the electronic card for transmitting/receiving radiofrequency signals from and to a Wi-Fi communication system in radiofrequency; the multi-antenna system includes two reception antennas fixed permanently to the electronic card, in which the first antenna is positioned on the electronic card so that its direction of maximum reception lies on a first plane of polarisation, while the second antenna is positioned on the electronic card so that its direction of maximum reception lies on a second plane of polarisation intersecting the first plane of polarisation associated with the first antenna, forming an angle with it equal to or greater than 45; the gateway also comprises a transceiver module realized using MISO or MIMO technology, which is linked to the antennas in order to contemporaneously elaborate the signals received independently by said antennas in order to reconstruct on the basis of the independent signals, the signal transmitted by the Wi-Fi communication system.

A signal testing system and method for evaluating wireless communication signals transmitted between a base station and a communication site is provided. The signal testing system comprises an antenna located at the communication site for communicating the wireless communication signals between the base station and the communication site, an adjustable mount associated with the antenna for orienting the antenna in a plurality of pan orientations and a plurality of tilt orientations, an adjustable boom associated with the adjustable mount for positioning the antenna at a plurality of heights and a communication unit to measure characteristics of the wireless communication signals. The adjustable mount is fixed in a set pan orientation and a set tilt orientation and the adjustable boom is fixed height when the communication unit measures the characteristics of the wireless communication signals. The method uses the system.

Method of autonomous detection and positioning method of indoor wireless network faults, the method comprising: building an indoor three-dimensional spatial structural model and an indoor transmitting antenna model of a target building, calculating the signal strength of the indoor transmitting antenna model inside the target building according to a ray-tracing propagation model algorithm to determine key testing positions of the target building, each key test position being associated to an individual transmitting antenna and maximizing the difference between the signal strength generated by its corresponding antenna and that generated by other antennas, deploying mobile phones with an automatic dial testing function at the key testing positions of indoor wireless networks and starting the dial testing mobile phones when the wireless networks are idle, collecting measurement reports reported by the dial testing mobile phones, detecting and locating faults of indoor networks and devices according to the measurement reports.

A method, antenna switching integrated circuit (IC), and communications device that connect a transmitter to a selected antenna to propagate at least one transmission signal to the selected one of at least two antennas, based on feedback information associated with one or more antennas. An antenna tuning and switching (ATS) controller receives feedback information about a current status of an antenna tuner, wherein the current status of the antenna tuner is either locked or unlocked. In response to the current status of the antenna tuner being in a locked state, the ATS controller triggers an antenna selection switch to connect the antenna (that is associated with the antenna tuner) to the transmitter in order to propagate the transmission signal(s) from the transmitter to the antenna. If the antenna tuner is in an unlocked state, the ATS controller selects a different antenna that is not associated with an antenna tuner.

The invention discloses a pre-coding method of a MIMO relay system having a channel estimation error and antenna correlation. Under a condition that both the power of a transmitting end and the power of a relay end are limited, closed-form solutions of a pre-coding matrix of the transmitting end, a pre-coding matrix of the relay end and a processing matrix of a receiving end are obtained by derivation in a manner of taking a minimum mean square error as a criterion; therefore, the system performance can be improved well; a joint iterative algorithm for calculating the pre-coding matrix of the transmitting end, the pre-coding matrix of the relay end and the processing matrix of the receiving end is given; the joint iterative algorithm has good convergence and practical value and is easy to implement; the MIMO relay system is combined with problems of the channel estimation error and the antenna correlation; the condition that incomplete channel state information exists in a practical condition is considered; the pre-coding method of the MIMO relay system under the condition of the channel estimation error and the antenna correlation is implemented to improve the performance of the MIMO relay system based on the incomplete channel state information condition; and thus, the pre-coding method has wide application prospect.

The present invention relates to an apparatus for mitigating undesired portions of electromagnetic radiation (EMR) associated with an antenna. The apparatus comprises a coupling element EM inductively coupled with the antenna, the coupling element being substantially co-polarized with the antenna. The apparatus further comprises one or more dissipating elements EM inductively coupled with the coupling element, each of the one or more dissipating elements being substantially differently polarized than the antenna, for example cross-polarized to the antenna. The coupling element may be a conductive element configured for predetermined EM inductive coupling with at least the antenna and the one or more dissipating elements. Each of the one or more dissipating elements may be a conductive element configured for predetermined EM inductive coupling with the coupling element. A method of manufacture is also provided.

A system is provided for optimizing throughput in a communication system. During operation, the system receives, at a first antenna, estimated channel state information (CSI) at least one channel between the first antenna and at least one second antenna. The system obtains antenna correlation information associated with the first antenna and the second antenna, respectively. The system further calculates a set of noise terms associated with random noise for the at least one channel, and optimizes a configuration of beamformers for the first antenna and the at least one second antenna that maximizes a throughput of all antennas, in accordance with the estimated CSI, the obtained antenna correlation information, and the noise terms.

There is provided a network component of a wireless communication network. The network component includes at least two output ports, each output port being associated with an antenna. The network component further includes a controller for providing a power signal set having at least two power signal components, each power signal component being associated with one of at least two output ports and being indicative of a power portion to be provided to its associated antenna for generating a transmission to a receiving network component of the wireless communication network. Further, the network component includes a power adjustment unit for scaling power signal components of the power signal set, thereby providing a scaled power signal set.

The invention discloses a pre-coding method for a MIMO multi-relay system with antenna correlation and channel estimation errors. According to the method, with a condition that antenna correlation andestimation errors exist on channels considered, and the maximum power of a transmitting end and a relay end adopted as a constraint, firstly, a relay system based on channel estimation errors and antenna correlation, and a channel model are given, a constrained optimization function satisfying the MMSE criterion and power constraint is constructed, the closed-form solutions of a transmitting endpre-coding matrix, a relay pre-coding matrix and a receiving node processing matrix are given; a joint iterative method is adopted to perform alternate update until the algorithm converges, and the optimal solutions of each node matrix are obtained; and the iterative method has good convergence and is easy to implement. Since a condition that antenna correlation and channel estimation errors may both exist in a direct transmission path and two hops of channels in an actual situation is considered, the linear pre-coding method provided by the invention is more in line with the actual transmission situation of the MIMO multi-relay system.

An electronic proximity switch employs two oscillators coupled through two electrical paths, one associated with an antenna serving as a proximity switch sensor. Absorption by an object near the antenna changes the coupling between the oscillators producing a dramatic phase shift that may be detected and used for switching purposes.