Abstract: Provided is a low-complexity transmit/receive antenna selection method for Multi-Input Multi-Output (MIMO) systems. The method includes the steps of generating a gain matrix of receive channel, calculating norm values of channel gains for each row (receive antennas) and column (transmit antennas) of the generated gain matrix of the receive channel, selecting an antenna with the maximum norm value among the calculated norm values of channel gains, and repeatedly performing the process of alternately selecting transmit and receive antennas having the maximum channel gain value among the channel gain values of the selected antenna until a required number of antennas is all selected.

Abstract: A mobile phone includes a controller; a receipt adjusting unit for controlling receipt of the (RF) radio frequency signal and controlling receipt diversity under control of the controller; a first RF signal receiver for converting the RF signal received through the first antenna into a baseband signal to be transmitted to the controller under control of the receipt adjusting unit; a second RF signal receiver for converting the RF signal received through the second antenna into a baseband signal to be transmitted to the controller under control of the receipt adjusting unit; a transmission diversity adjusting unit for controlling transmission diversity under control of the controller; and an RF signal transmitter for converting the baseband signal transmitted from the controller into an RF signal to be transmitted to the first antenna and transmitting the RF signal to the second antenna under control of the transmission diversity adjusting unit.

Abstract: Systems and methods of training antennas for two devices equipped with phased array antennas in a wireless network are disclosed. In one embodiment, the methods include transmitting a plurality of estimation training sequences from a transmit phased array antenna to a receive phased array antenna, wherein a length of at least one of the plurality of training sequences is adapted to a number of antenna elements at one of the transmit and receive phased array antennas. The methods further include transmitting data to the receive phased array antenna via the transmit phased array antenna tuned with a transmit beamforming vector (BV) selected based at least in part on the plurality of estimation training sequences.

Abstract: A wireless communications device (100) includes a primary radio frequency branch (134) and a diversity branch (136), which is enabled and disabled to balance performance and power consumption. Diversity mode operation of the device is controlled, for example, based on one or more of an estimated channel quality indicator, data reception, data rate, state or mode of the station, estimated signal to noise ratio of a pilot signal, battery power level, distance from a serving cell, among other factors.

Abstract: Receiver diversity in a wireless device is controlled in response to operating conditions, transmission requirements, and control settings. The control of diversity reduces power consumption by enabling receive diversity on given conditions. Operating conditions, transmission requirements, and control settings are used separately or used in conjunction to determine whether benefits of multi-antenna receive diversity, such as higher link capacity, higher data throughput, lower transmit power, and lower error rate, warrant the higher power cost of the diversity.

Abstract: An apparatus and method for selecting antennas and nodes in a multi-input multi-output (MIMO) communication system are provided. The apparatus includes a reception unit which detects a communication initiation signal from among a plurality of received signals, a first combination unit which calculates communication capacity based on the communication initiation signal, searches for a combination of transmission antennas that can maximize the communication capacity, and performs communication using the identified combination of transmission antennas, a second combination unit which calculates an average signal-to-noise ratio (SNR) of each node based on the communication initiation signal and selects a node with a highest average SNR and performs communication using the selected node, and a selection unit which activates one of the first combination unit and the second combination unit and inactivates the other combination unit.

Abstract: A communication system includes a storage device having a storage area accessed in one of a page unit and a sector unit; a control device operable to request access to data in a file unit; and a predetermined transmission line for transmitting data between the storage device and the control device. The control device transmits to the storage device via the transmission line a request for access to one of each page and each sector forming a file for which access has been requested, and the storage device sequentially accesses one of a requested page and a requested sector, whereby a request for access to the entire file is realized in the storage area.

Abstract: Certain embodiments of the invention may be found in a method and system for antenna selection diversity with prediction. An antenna diversity system may use information that it has stored on the antenna selection process in previous frames to predict the starting receiving antenna and the starting transmission antenna for the next frame. The prediction may be based on which antennas were selected in previous frames or may be based metrics associated with performance of the antennas. Prediction may be based on a majority polling scheme of previously selected antennas in a determined number of previous frames. Prediction may also be based on a weighted sum of at least one selection metric for all antennas in a determined number of previous frames. Antenna prediction provides a significant performance improvement by reducing the processing and operational overhead in cases where a transmit or a receive antenna dominates.

Abstract: Methods and systems for auto detecting and auto switching antennas in a multi-antenna FM transmit/receive system are disclosed and may include detecting when an external antenna may be coupled to an external port of the wireless device and utilizing the external antenna for transmitting and/or receiving FM signals. The decoupling of an external antenna from an external port may be detected, which may cause the FM radio transmitter/receiver to be configured to transmit and/or receive FM signals utilizing antennas internal to the wireless device. One or more test signals, which may include AC signals, may be generated within the chip for detecting whether an external antenna may be coupled to an external port. A reflected signal from an external port may be measured and compared to a prestored value corresponding to a reflection due to an open circuit at the one or more external ports of the wireless device.

Abstract: A radio equipment, wherein an attenuator (10) is inserted between antennas (91, 92) and a radio module (2), and output and input sensitivities are raised and lowered simultaneously so as to keep the balance of a radio covering range with an input receiver coverage at a constant, and the antenna (91) and the antenna (92) with attenuator are switched over by a switch (8) to increase and decrease the radio coverage range and input receiver coverage while keeping the balance of the dynamic radio coverage range with the input receiver coverage.

Abstract: An apparatus and method for transmitting/receiving data in a mobile communication system using multiple antennas are provided. A receiver estimates a fading channel of received data, selects a weight set relative to a maximum data transmission rate from at least one weight set with elements of a plurality of orthogonal weight vectors, and transmits feedback information including the selected weight set and channel-by-channel state information to a transmitter. The transmitter demultiplexes data to be transmitted on a basis of the feedback information into at least one sub-data stream, multiplies each sub-data stream by an associated weight, and transmits the data.

Abstract: Disclosed is an apparatus in a diversity system of a mobile terminal having a main receiving unit and a sub-receiving unit, which includes a sub-antenna for receiving an input signal and a part of a transmitted signal of a transmitting unit, a band-pass filter (BPF) designed to greatly attenuate a low-band frequency of the part of the transmitted signal received through the sub-antenna, a high-pass filter (HPF) for additionally attenuating the part of the transmitted signal attenuated through the BPF, a low-noise amplifier for minimizing a noise of an output value of the HPF, an HPF for passing therethrough only a high-frequency component of an output value of the low-noise amplifier, and a mixer for mixing output values of the HPF and outputting a baseband signal. One of two BPFs in the sub-receiving unit is replaced by one HPF, and thus the HPF can be fabricated on chip with the terminal receiving unit.

Abstract: A method of performing receive antenna selection is presented. The method executes a determination operation for a set of receive antennas, determines a maximum result of the determination operation for two of the antennas, eliminates one of the two antennas from the set of antennas, and repeats the determination and elimination process until only a predetermined number of antennas remain in the set. The signals from these remaining antennas are then processed. The present invention reduces receiver complexity and cost.

Abstract: A demodulation signal is generated by provision of a demodulation signal generation circuit to the semiconductor device capable of wireless communication and by obtainment of a difference between voltages having opposite polarities by the demodulation signal generation circuit. Alternatively, a plurality of demodulation signal generation circuits and a selective circuit which selects a demodulation signal generation circuit depending on characteristics of a received signal are provided, where operation of a second demodulation signal generation circuit stops when a first demodulation signal generation circuit is operated. The selective circuit includes an inverter circuit, a flip-flop circuit, and a selector circuit. When the second demodulation signal generation circuit has a comparator and the like, power consumption thereof is reduced.

Abstract: A transceiver circuit and a method in a wireless communication network are provided, where a signal power level for a signal received at the transceiver circuit is measured and compared to a predefined threshold power level. At least two groups of power amplifiers may be used, where one group is optimized for high efficiency above the predefined threshold power level, and one group is optimized for high efficiency below the predefined threshold power level. The amplifiers may be used to amplify the received signal depending on the signal power level in relation to the predefined power threshold level. The signal may then be filtered by duplex filters and forwarded to a diversity antenna or a main antenna where it is transmitted over an air interface.

Abstract: A communications device for receiving a propagating electromagnetic signal representing an information signal. The communications device comprises a first and a second radiator each comprising a plurality of structural elements; a controller for configuring one or more of the structural elements of the first radiator to produce first operating characteristics of the first radiator, the first radiator producing a first received signal responsive to the first operating characteristics; the controller for configuring one or more of the structural elements of the second radiator to produce second operating characteristics of the second radiator different than the first operating characteristics, the second radiator producing a second received signal responsive to the second operating characteristics and a signal processor responsive to at least one of the first and the second received signals for determining the information signal.

Abstract: An apparatus and method are disclosed for achieving receiver diversity. A wireless unit includes a plurality of antennas, an antenna selector to select one or more antennas from the plurality of antennas, a processor with input data from an inertial sensor for monitoring the orientation of the wireless unit. Based on the input data, the processor commands the antenna selector to select one or more antennas. In some embodiments, the processor is a diversity processor. Based on the input data from the inertial sensor, the diversity processor computes the combination of the received signals. In another aspect, the wireless unit further includes a baseband processor to process the output of the diversity processor for a particular unit application.

Abstract: When the diversity reception is cut, communications with the base station are continued. When it is judged by the judgment section of the mobile communication terminal that a predetermined disconnection requirement for disconnecting diversity reception is satisfied, the gain control section of the digital baseband circuitry 20 reduces the gain of the AGC14B contained in the RF receiver circuitry 10B constituting the disconnection target by a fixed value at fixed times. Diversity reception is cut after the level of the signal output by the AGC14B has reached zero.

Abstract: A receiver includes a receiving unit for scanning a dedicated signaling channel for the presence of an announcement signal. The announcement signal indicates a transmitter willing to access a transmission medium. The receiving unit is further operative to receive a data signal from a further transmitter on a dedicated traffic channel. Furthermore, the receiver includes an interference estimator for estimating, whether an interference caused by a new transmitter is allowable or not. A processor is provided for applying an interference counter-measure, when the interference is not allowable. A transmitter can, without any limitation, transmit the announcement signal. The transmitter will start transmitting, when it receives a ready-to-receive signal from the addressed receiver and when it does not receive an objection tone from another receiver in the network.

Abstract: A method of performing receive antenna selection is presented. The method executes a determination operation for a set of receive antennas, determines a maximum result of the determination operation for two of the antennas, eliminates one of the two antennas from the set of antennas, and repeats the determination and elimination process until only a predetermined number of antennas remain in the set. The signals from these remaining antennas are then processed. The present invention reduces receiver complexity and cost.

Abstract: Signal to interference plus noise ratio information, delay spread information, or condition number information of a channel matrix in a multiple input multiple output communication are taken into account in addition to spatial fading correlation information for selecting a combination of at least two antennas from a plurality of antennas, then, the multiple input multiple output communication is conducted by using the selected antennas.

Abstract: Device, system, and method of phased-array calibration. In some demonstrative embodiments, a wireless communication device may include an array of antenna elements; a calibration element located at a predefined location relative to the antenna elements; and an antenna controller capable of calibrating at least one beam forming weight of at least one antenna element of the array of antenna elements based on a detected phase of a calibration signal transmitted via one of the calibration element and the antenna element and received via another of the calibration element and the antenna element. Other embodiments are described and claimed.

Abstract: According to one exemplary embodiment, a switching device with phase selection terminals to select between at least two phase shifting modes to reduce intermodulation distortion in the switching device includes a first phase selection terminal to select a first phase shifting mode of the switching device by enabling a first phase shifter in a first phase shifting switching branch coupled to an input of the switching device. The switching device further includes a second phase selection terminal to select a second phase shifting mode of the switching device by enabling a second phase shifting switching branch coupled to the switching device input. The intermodulation distortion in the switching device is reduced by selecting one of the first and second phase shifting modes. The switching device may further include a number of FETs coupled in series between an output of the switching device and the first and second phase shifting switching branches.

Abstract: A cellular mobile communication system using multiple antennas reselects a plurality of transmission antennas of base stations connected to a mobile station. The system includes measuring a channel quality parameter used for estimation of channel performance, determining whether to reselect the transmission antennas using the measured channel quality parameter, reselecting transmission antennas of the base stations connected to the mobile station, and connecting the reselected transmission antennas to the base station.

Abstract: Embodiments of the present invention relate to communication systems. Such communication systems may include a beamformer that is adapted to provide a plurality of beams, each of the plurality of beams providing communication for a corresponding coverage envelope, the plurality of coverage envelopes comprising at least one pair of overlapping coverage envelopes and at least one pair of non-overlapping coverage envelopes, and a scheduler that assigns system resources from a group of shared system resources to a plurality of receivers distributed throughout the coverage envelopes, the scheduler being adapted to assign the same system resources from the group of shared system resources for use during a simultaneous data transmission to a receiver in each of the coverage envelopes that comprises the at least one pair of non-overlapping coverage envelopes.

Abstract: A receiving apparatus includes a receiving module and a processing module. The receiving module is used for receiving a plurality of received signals and selecting the received signals to generate a plurality of input signals. The processing module is used for processing the input signals to generate an output signal.

Abstract: An antenna structure includes first and second antennas. The first antenna has a first geometry corresponding to a first frequency. The second antenna has a second geometry corresponding to a second frequency. The second antenna is proximal to the first antenna and utilizes electrical-magnetic properties of the first antenna to transceive signals at the second frequency.

Abstract: When the diversity reception is cut, communications with the base station are continued. When it is judged by the judgment section of the mobile communication terminal that a predetermined disconnection requirement for disconnecting diversity reception is satisfied, the gain control section of the digital baseband circuitry 20 reduces the gain of the AGC14B contained in the RF receiver circuitry 10B constituting the disconnection target by a fixed value at fixed times. Diversity reception is cut after the level of the signal output by the AGC14B has reached zero.

Abstract: Communications device may include a plurality of antenna elements, an ancillary control receiver, and a primary receiver. The plurality of antenna elements may provide respective fixed beams. The ancillary control receiver may be coupled to each of the antenna elements, and the ancillary control receiver may be configured to measure a signal strength from each of the antenna elements and to select one of the antenna elements responsive to the measured signal strengths. The primary receiver may be configured to receive communications using the selected antenna element. Related methods are also discussed.

Abstract: A method and apparatus for operating a radio reception system, which comprises a plurality of receivers assigned to a common output device, in which one of the receivers is designated as audio receiver and is tuned to a frequency of a radio transmitter, and outputs a signal received from the transmitter to the output device. At least one second receiver is designated as search receiver, and continuously searches its own reception frequency band for a frequency of the same transmitter. The system changes to a frequency of this transmitter, which was found by the search receiver, if the quality of the signal received by the audio receiver falls below a certain limit.

Abstract: Embodiments of the invention may provide for a CMOS antenna switch, which may be referred to as a CMOS SPDT switch. The CMOS antenna switch may operate at a plurality of frequencies, perhaps around 900 MHz, 1.9 GHz and 2.1 GHz according to an embodiment of the invention. The CMOS antenna switch may include both a receiver switch and a transmit switch. The receiver switch may utilize a multi-stack transistor with body substrate switching and attachment of external capacitor between drain and gate to block high power signals from the transmit path as well as to maintain low insertion loss at the receiver path. Exemplary embodiments of the CMOS antenna switch may provide for 38 dBm P 0.1 dB at multi bands (e.g., 900 MHz, 1.8 GHz, and 2.1 GHz). In addition, ?60 dBc second and third harmonic performance up to 30 dBm input, may be obtained according to example embodiments of the invention.

Abstract: The invention relates to the field of wireless communications, more particularly to a method of and device for switching between antennae in communication with a diversity receiver, each of the antennae receiving signals transmitted from a single source. A packet from a transmitter is received by respective antenna communicating with a diversity receiver. The signal strength of the preamble of the packet received in a first antenna is sampled. If the signal strength is of sufficient magnitude to affect reliable reception, the associated antenna is selected for the duration of the packet transmission. If the signal strength is below a predetermined threshold the signal strength of the preamble of the packet received in a second antenna is sampled and compared to the sample associated with the first antenna. If the magnitude of the second sample is greater, the signal associated with the second antenna is selected.

Abstract: A method for radio communication in a wireless local area network including at least one transceiver equipped with an antenna with a controlled directivity pattern, according to which, in addition to the assignment in advance of the threshold value of communication quality H0 corresponding to the minimum pre-specified communication quality, the current value of communication quality Qcur is periodically determined based on the signal being received, the threshold value of the communication quality Hmax (corresponding to the pre-specified maximum communication quality) is also additionally assigned in advance.

Abstract: An antenna diversity receiver has a low-IF receiving mode and a diversity selection mode, and a switch arrangement for coupling one of the antennas to the IF channels when in the receiving mode, and coupling each of the channels to a different one of the antennas in the selection mode. A diversity controller compares qualities of signals received simultaneously from the different antennas during the selection mode, and controls the switch arrangement in the receiving mode, to use the better antenna. The quality measurement is carried out during reception of a carrier before a preamble to a desired signal is received, so that there is more time to obtain a better signal quality measurement and to enable better averaging over time. The channels have a polyphase filter with switchable cross coupling between the channels, so that it acts as two independent low pass filters in the selection mode.

Abstract: A method for transmitting a digital signal via n transmit antennas, wherein n is strictly greater than 2, comprising the steps of combining with a source data vector n vectors to be transmitted respectively by each of the transmit antennas by a coding matrix <I>M</I> with a yield equal to 1, using reference symbols known to at least one receiver whereby it is able to estimate at least three transmission channels corresponding respectively to each of said transmit antennas. Said coding matrix <I>M</I> applied a mathematical transformation to the reference symbols prior to the transmission thereof.

Abstract: The claimed subject matter relates to enabling antenna switching in a wireless terminal that has multiple receive antennas per receive chain via soft-demodulation and interleaving of concatenated code received in a strip channel. A coherent demodulation protocol may be performed to estimate an SNR for a first antenna during a first time period, and a non-coherent demodulation protocol may be utilized on the strip channel to estimate an SNR for at least one other antenna during a second time period. SNRs may be compared and the terminal may select the antenna with the highest SNR for a next transmission superslot.

Abstract: A system and method are presented for transceiving Time Division Multiple Access (TDMA) telephone communications through a common filter. The system includes a tunable ferro-electric bandpass filter (FE BPF), a controller, a low noise amplifier (LNA), and a power amplifier (PA). The FE BPF has a control input to accept tuning voltage signals from the controller and two signal ports. In response to the tuning voltage signals, the FE BPF selects a transmit or receive frequency passband between the signal ports. The FE BPF first signal port is connected to the LNA and the PA and the FE BPF second signal port is connected to an antenna in a wireless device. The LNA and PA are activated and deactivated in response to control signals from the controller.

Abstract: A software defined radio system is described. The software defined radio comprises a modem bank at least partially defined by software running on a processor. The SDR also comprises an antenna group translator coupled to the modem bank. Further, the SDR comprises at least one antenna coupled to the antenna group translator. The antenna group translator comprises an antenna switch comprising RF filtering functions and RF front ends comprising frequency conversion functions. To greatly reduce the complexity and cost of the system, the architecture includes an antenna group translator having RF front end hardware that is specific to the frequency band of each antenna. In addition, the modem bank includes banded frequency converters.

Abstract: A method for switched diversity, including: determining, on a pair-wise basis, a plurality of comparative quality factors corresponding to at least two antennas based on signals received by the at least two antennas; filtering, over a period of time, multiple instances of at least one of the plurality of comparative quality factors; and selecting at least one of the signals to couple to at least one receiver chain based on the comparative quality factors.

Abstract: A dual-mode antenna device (20) includes a wireless module (207) and a second wireless module (208) transceiving signals of a first wireless network signal and a second wireless network. A first antenna (201) and a second antenna (202) transceive the signals, respectively. A first switch (203) is connected to the first antenna and a second switch (204) is connected to the second antenna. A third switch (205) is connected to the first switch, the second switch and the first wireless network module. A fourth switch (206) is connected to the first switch, the third switch and the second wireless network module. The first, third, and fourth switches collaboratively select the first antenna to transmit the wireless network signals. The second, third, and fourth switches collaboratively select the second antenna to transmit the wireless network signals.

Abstract: The present invention is characterized in that with the purpose to reduce influences of a calibration circuit on the calibration, a first calibration weight basic amount and a second calibration weight basic amount are calculated based on each of a calibration signal transmitted from a calibration unit (50) to a base station transmit-receive unit (40) via an antenna x unit (10-x) and a calibration signal transmitted from the base station transmit-receive unit (40) to the calibration unit (50) via the antenna x unit (10-x) respectively, and a calibration weight is calculated based on the first calibration weight basic amount and the second calibration weight basic amount.

Abstract: The present invention relates to a receiver for processing a received signal (SEQ), said receiver being multimode. The invention is characterized in that it comprises; a) a single RF chip for processing the received signal (SEQ) in any mode, said chip comprising a spreading section (SPREAD SEC) for spreading and downconverting to baseband a received signal (SEQ), and a channel filtering section (CH SEC) for DC offsets rejection on a received signal (SEQ), and b) a single baseband chip (BB) comprising despreading means (DSPR) for despreading a spread signal (SEQ).

Abstract: A transceiver system for RF communications in a wireless network includes a transceiver having first and second receivers and a transmitter. The first receiver and transmitter are connected to first antenna section. The second receiver is switchable between connection to a second antenna section and connection to the first antenna section. In a dual diversity mode, the second receiver is connected to the second antenna section, and the two receivers are tuned to the same RF channel set. Thus, multi-path faded signals in the RF channel set are received at the two antenna sections. In a cross-connected mode, two of the transceivers are used together, with the second receiver in each being connected to the first antenna section. Each transceiver supports one antenna, and the receivers in each transceiver (as well as the transmitters) are respectively tuned to different RF channel sets. Thus, system capacity is doubled in conjunction with diversity reception.

Abstract: A wireless transceiver system for compensating a transport loss includes a transceiver (100), a tower mounted amplifier (TMA) (200), and a transport loss detector (400). The transceiver transmits a first signal at a transmit power. The first signal is changed into a second signal after cable attenuation from the transceiver. The TMA is connected to the transceiver via a cable, receives a second signal, and amplifies the second signal. The transport loss detector is connected to the TMA, and calculates a transport loss between the transceiver and the TMA. The TMA further compensates the transport loss between the transceiver and the TMA according to the calculated result of the controller.

Abstract: A receiver comprises a plurality of paths for receiving wireless signals, each path having a designated antenna; and an antenna diversity chain adapted for information communication between the plurality of paths for a selecting and using a path among the plurality of paths.

Abstract: A device and method for automatically changing a broadcast channel of a vehicle television with a diversity antenna is provided. The device includes an antenna switching unit connected with the diversity antennas and switching one of the diversity antennas; an image signal level detector for detecting an image signal level; an audio signal level detector for detecting an audio signal level; a storage unit for storing regional broadcast channel information, a channel change history, a value of number of switching times; and a controller for controlling the antenna switching unit, counting and storing the number of switching times, checking a quality of the broadcast signal, deciding a desired broadcast channel, and controlling the tuner to change into the decided broadcast channel.

Abstract: A radio system for the reception of broadcast signals is provided that includes two antennas picking up radio signals and two signal receivers receiving the radio signals, the two antennas and the two receivers operating in diversity operating modes. The radio system further includes an antenna switching unit for creating a connection between the receivers and the antennas and a control unit for controlling the antenna switching unit and selecting the operating mode according to predetermined diversity control criterion.

Abstract: A wireless transceiver system, for compensating a transport loss, includes an antenna (300), a transceiver (100), a tower mounted amplifier (TMA) (200), and a transport loss detector (400). The transceiver transmits a first signal at a transmit power. The first signal is changed into a second signal after the cable attenuation from the transceiver. The TMA, connected to the transceiver via a cable, receives the second signal and amplifies the second signal. The transport loss detector, connected between the TMA and the transceiver, detects a transmission state of the transceiver, and calculates a transport loss between the transceiver and the TMA. The TMA transmits signals to the antenna or receives signals from the antenna according to the detected result of the transport loss detector, and compensates the transport loss according to the calculated result of the transport loss detector.

Abstract: An antenna selection technique (transmitter/receiver antenna selection) that reduces the cost of the MIMO system while maintaining high performance. A combined selection algorithm for MIMO-OFDM is provided which offers the best tradeoff between spatial correlation and instantaneous SNR. In one case, antenna selection is based on instant channel information. In another case antenna is based on statistical channel state information. In another case, antenna selection is based on a hybrid of instant channel state information and statistical channel state information.

Abstract: A controller controls the automatic positioning of an antenna. The controller is arranged to position the antenna dependent upon a channel selected by a user, a location of a receiver tuned to the selected channel, and a location of a source of a signal associated with the selected channel.