Abstract: In one embodiment, a receiver is provided for use in a multiple-input system that includes a receiving antenna receiving a time-domain signal corresponding to a plurality of signals transmitted from a plurality of transmitting antennas. The receiver includes: (a) a transform unit adapted to transform the time-domain signal into a frequency-domain signal; (b) a channel estimation unit adapted to estimate, based on the frequency-domain signal and a frequency-domain pilot signal, a combined transfer function corresponding to a plurality of transfer functions of respective channels between the plurality of transmitting antennas and the receiving antenna; and (c) a channel separation unit including a plurality of frequency-domain convolution units that separate the combined transfer function into a plurality of estimated channel transfer functions.

Abstract: Methods and wireless devices are provided that implement both multi-carrier reception and diversity processing.

Abstract: A wireless device, which employs the method and function of removing the coupling and correlation of antennas, picks up the noise components released from inside the device together with the current induced to a second antenna. The wireless device then controls the amplitude and phase of the pickup signal so as to optimize the reception quality signal for received signal, and additively combines it with the signal received from the first antenna. The coupled component, which is induced from the first antenna to the second antenna, is cancelled together with the noise component, thus mainly cancelling the largest cause of desensitization. This results in the maximization of the receiving sensitivity.

Abstract: A diversity receiver receives high rate radio signals (for example DVB-T signals) while the receiver is moving at a high speed (for example in or with a car). Two or more antennas are closely spaced and arranged behind each other in the direction of motion for receiving the radio signals. A difference (S2(t)?S1(t)) of a first signal (S1(t)) obtained via the first antenna and a second signal (S2(t) obtained via the second antenna serves as an estimation of the spatial derivative of the receiving channel transfer function. This spatial derivative is interpreted as a temporal derivative and exploited to cancel or at least reduce distortions (for example ICI) due to rapid receiving channel variations.

Abstract: An object of the invention is to provide a diversity receiver and a reception system switching method capable of controlling diversity reception start and stop according to the switch condition responsive to person's liking and the use environment. An input section (109) allows the user to select and specify any of a diversity reception mode using two reception channels at all times, a single reception mode using a single reception channel at all times, or an automatic control reception mode for switching between the diversity reception and the single reception in response to the reception state of each mode, and a control section (107) determines a switching determination condition used in the automatic control reception mode according to mode selection information of other two modes.

Abstract: An apparatus for reducing power consumption of a receiver in a high-speed wireless communication system and a control method thereof are provided. The apparatus for processing a signal in a receiver of a wireless communication system includes a carrier sensor configured to sense a carrier used in the wireless communication system, a decoder configured to decode the detected carrier signal to a signal and data, and a controller configured to control supplying power and a clock only to the carrier sensor during carrier sensing, and supplying power and a clock to an overall receiver when a carrier is sensed.

Abstract: A configuration controller generates one or more control signals based on channel data. A receiver includes an RF receiver section and a receiver processing module that are configured in response to the control signal. A transmitter includes an RF transmitter section and a transmitter processing module that are configured in response to the control signal.

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: Embodiments disclosed herein relate to a directional diversity receive system. The system may comprise a plurality of antennas attached to and fixed with respect to a frame. The system may further comprise a steerable antenna attached to and moveable with respect to the frame. The system may be encapsulated by a cover and may be configured for relocation as an integrated module.

Abstract: A control method in a mobile communication system comprising an antenna group including a plurality of antennas each transmitting different antenna identification information includes assigning identification information that allows distinction among antennas included in an antenna subgroup to each antenna included in the antenna subgroup, the antenna subgroup being part of the antenna group; notifying the correspondence between each antenna included in the antenna subgroup and the identification information to a mobile station; and the mobile station using the identification information to distinguish among the antennas included in the antenna subgroup based on the notified correspondence.

Abstract: A multiple-antenna receiver can enable and disable receive radio frequency front-end and analog front-end circuits of specific antenna receiving routes according to a predetermined scheme during the receive data phase. The predetermined scheme calculates signal quality indices of the receiving route antennas by means of a preamble sequence, and derives the modulation and coding scheme and the number of spatial streams via the information provided by a header sequence. Indications of the signal quality indices are compared with threshold values to determine which receiving routes are to be turned on and which receiving routes are to be turned off.

Abstract: Enhanced performance is achieved by combining channel coding with the space-time coding principles. With K synchronized terminal units transmitting on N antennas to a base station having M?K receive antennas, increased system capacity and improved performance are attained by using a concatenated coding scheme where the inner code is a space-time block code and the outer code is a conventional channel error correcting code. Information symbols are first encoded using a conventional channel code, and the resulting signals are encoded using a space-time block code. At the receiver, the inner space-time block code is used to suppress interference from the other co-channel terminals and soft decisions are made about the transmitted symbols. The channel decoding that follows makes the hard decisions about the transmitted symbols. Increased data rate is achieved by, effectively, splitting the incoming data rate into multiple channels, and each channel is transmitted over its own terminal.

Abstract: The present invention relates to a radio communication equipment comprising a first antenna 1, a first RF unit 2 for wireless communication, the first RF unit 2 being connectable to said first antenna 1, wherein a first frequency band is used by said first RF unit 2 for reception of a signal via said first antenna 1 and a second frequency band is used by said first RF unit 2 for transmission of a signal via said first antenna 1, said first and second frequency bands being used alternatively by said first RF unit 2 and a second RF unit 3 for wireless communication, the second RF unit 3 being connectable to said first antenna 1, wherein a third frequency band is used by said second RF unit 3 for reception of a signal and a fourth frequency band 3T is used by said second RF unit 3 for transmission of a signal, said third and fourth frequency bands being used simultaneously by said second RF unit 3.

Abstract: Provided is a multi-antenna transmission device (400) which can perform MLD by using a simple configuration of a reception device in a MIMO-AMC system. The multi-antenna transmission device (400) includes common signal point mapping units (401, 402) for mapping data transmitted from different antennas (111, 112) in transmission scheme using MIMO spatial multiplexing, to common signal points shared by respective modulation methods. Thus, the arrangement of baseband signal points obtained by mapping a code word after channel encoding onto an IQ plane can be shared as common signal points shared by modulation methods. Accordingly, the reception device need not prepare a particular circuit for performing MLD calculation in accordance with a combination of the methods for modulating the signals which have been MIMO-space multiplexed. This can reduce the circuit size of the MLD calculation circuit.

Abstract: Methods and apparatus are presented for improving the feedback of channel information to a serving base station, which allows a reduction in the reverse link load while allowing the base station to improve the forward link data throughput. Over a channel quality indicator channel, a carrier-to-interference (C/I) symbol is transmitted over multiple slots at a reduced rate, which increases the likelihood that the base station can decode said symbol. The reduced rate mode can be selectively triggered by a high velocity condition or other unfavorable channel condition. The C/I symbol is used to determine transmission formats, power levels, and data rates of forward link transmissions.

Abstract: A system for diversity processing a signal propagated via two diversity antennas includes: respective propagation paths for propagating two replicas of the signal, these propagation paths being coupled to the two diversity antennas so that the replicas are propagated via different antennas; a time variable delay element for subjecting at least one of the replicas to a time variable delay; and a level adjusting element, such as an asymmetric splitter, to produce a level imbalance between the power levels of the replicas propagated via the two diversity antennas.

Abstract: An object of the invention is to receive, with a high sensitivity, a radio signal transmitted within a short time before a capsule endoscope reaches the stomach of a subject and acquire, in a satisfactory state, information on the interior of the subject such as image data picked up by the capsule endoscope. The receiving apparatus according to the invention includes a plurality of receiving antennas including a specified receiving antenna for receiving a radio signal from a capsule endoscope before the stomach is reached, a switching controller, an arrival determining unit and a mode switching unit. The switching controller performs a control operation for switching to and maintaining the receiving antenna in an initial mode or a control operation for switching to the receiving antennas in a normal mode. The arrival determining unit determines whether the capsule endoscope has reached the stomach or not.

Abstract: An OFDM radio reception device 100 with multiple antennas 110-1 to 110-K removes a guard interval CP from each received signal, and performs S/P conversion, FFT, and channel estimation, on each received signal. The OFDM radio reception device 100 performs channel equalization by multiplying each signal resulting from FFT by a corresponding channel response value obtained by channel estimation. Moreover, the OFDM radio reception device 100 obtains a covariance matrix for each of the busts, and then calculates a reception weighting factor on the basis of each covariance matrix. Furthermore, the OFDM radio reception device 100 multiplies each signal mapped to the corresponding burst by the corresponding reception weighting factor, and then combines the received signals.

Abstract: A MIMO radio transceiver to support processing of multiple signals for simultaneous transmission via corresponding ones of a plurality of antennas and to support receive processing of multiple signals detected by corresponding ones of the plurality of antennas. The radio transceiver provides, on a single semiconductor integrated circuit, a receiver circuit or path for each of a plurality of antennas and a transmit circuit or path for each of the plurality of antennas. Each receiver circuit downconverts the RF signal detected by its associated antenna to a baseband signal. Similarly, each transmit path upconverts a baseband signal to be transmitted by an assigned antenna.

Abstract: A Wireless Local Area Network (WLAN) module and a Bluetooth module for a mobile communication terminal. A baseband unit for WLAN and Bluetooth, generates a signal indicating whether WLAN and Bluetooth services are in progress. A switch switches the at least two antennas to the Bluetooth module if only the Bluetooth service is in progress and switches the at least two antennas to the WLAN module if only the WLAN service is in progress. Therefore, antenna diversity is achieved if only one of the WLAN and Bluetooth services is in progress.

Abstract: Methods and systems for blocker attenuation using multiple receive antennas are disclosed. Aspects of one method may include receiving wideband signals multi-antenna receiver. The receiver may process received signals that may comprise blocking signals received via the multiple antennas. The blocker received by a first antenna may be suppressed, at least in part, by combining processed signals received by a first antenna with processed signals received by a second antenna. The combining may comprise, for example, adding the two processed signals at either the RF or IF frequencies. The processing of the signals whose blocker is to be suppressed may be gain adjustment. The processing of the other signals used to suppress the blocker of the first antenna may be gain and/or phase adjustment. Accordingly, a blocker received by any antenna may be suppressed, at least in part, by using processed signals received by another antenna.

Abstract: A wireless communications network includes a plurality of wireless devices equipped with direction-agile antenna systems to allow the wireless devices to establish and maintain wireless data links with each other.

Abstract: A receiver includes an antenna array that generates a plurality of received signals from at least a first remote transmitter and a second remote transmitter. Aa plurality of receiver sections process the plurality of received signals to generate a plurality of down-converted signals. A receiver processing module generates a first plurality of reception matrices corresponding to the first remote transmitter based on the plurality of down-converted signals, generates a first reception statistic from a sum based on the first plurality of reception matrices, and generates an association decision corresponding to one of: the first remote transmitter and the second remote transmitter, based on the first reception statistic.

Abstract: The present invention relates to a wireless communication device, such as a transponder, that has a plurality of antennas for multi-frequency usage. The wireless communication device comprises a control system, communication electronics, memory, and the aforementioned antennas. A wireless communication device having a pole antenna may be used with one or more loop conductor antennas to achieve the desired operating frequencies. A wireless communication device having a dipole antenna may be coupled across a loop conductor antenna to provide different loop conductor configurations depending on the frequency.

Abstract: The present invention relates to a wireless communication device, such as a transponder, that has a plurality of antennas for multi-frequency usage. The wireless communication device comprises a control system, communication electronics, memory, and the aforementioned antennas. A wireless communication device having a pole antenna may be used with one or more loop conductor antennas to achieve the desired operating frequencies. A wireless communication device having a dipole antenna may be coupled across a loop conductor antenna to provide different loop conductor configurations depending on the frequency.

Abstract: Multiple-input/multiple-output (MIMO) antenna technology is used in a point-to-point radio link to provide higher data rates than would otherwise be achievable in a similar system that did not use MIMO antenna technology. Particular embodiments of the invention implement channel coding, dual polarization, adaptive receiver combining and adaptive power control.

Abstract: A signal transmission apparatus for transmitting a signal using multiple antenna elements comprises a transmission signal generator configured to convert at least one of a first signal addressed to an arbitrary mobile terminal belonging to a geographical area and a second signal addressed to a specific mobile terminal located in a part of the geographical area into one or more transmission signals to be transmitted using a prescribed beam pattern; a weighting adjustor configured to weight said one or more transmission signals for each of the antenna elements to define the prescribed beam pattern; and a signal synthesizer provided for each of the antenna elements and configured to synthesize the weighted transmission signals.

Abstract: A hand-held portable printer includes a number of input devices mounted in or on a printer housing including a barcode scanner, keypad, communication interface in a receive mode and an RFID read/writer in a read mode. The hand-held portable printer also includes a number of output devices including a printing system, the communication interface in a transmit mode and the RFID read/writer in a write mode for writing to an external RFID chip. A processor selects received data from one or more of the input devices manipulates the data and/or combines it with other data for an output device wherein the data selected for one output device may be different then the data selected for another output device. The hand-held portable printer may utilize both an internal antenna and external antenna. Applying different energy levels to the antennas may determine whether the hand-held portable printer reads from and/or writes to a single RFID chip or a plurality of RFID chips.

Abstract: Provided are a receiver and a method for detecting a signal in a multiple antenna system. The receiver includes a filter coefficient calculator and a signal detector. After separating a first signal portion and a second signal portion, the filter coefficient calculator calculates an MMSE filter coefficient using a Matrix Inversion Lemma such that an inverse matrix of the first signal portion has a predetermined constant value regardless of a repetition signal detection process. The signal detector detects a relevant transmission signal from an interference-removed reception signal using the MMSE filter coefficient.

Abstract: In an information processing apparatus such as a notebook type personal computer having radio communication functions, for communication units to simultaneously carry out transmission/reception independently of each other without increasing the number of antennas, and for sufficiently utilizing a diversity function in the case of only a portion of the communication units, there are provided antennas, communication units capable of carrying out radio communications through the use of the antennas, respectively, and a switching unit for switching connection states between the antennas and the communication units.

Abstract: An asynchronous receiver system has multiple antennae and an asynchronous receiver circuit with a signal input. The asynchronous receiver circuit receives a wireless signal at the signal input and generates a first quality signal responsive to the received wireless signal. A switch selects one of the antennae for coupling to the input of the asynchronous receiver circuit responsive to a control signal. A controller receives the first quality signal and generates the switching control signal. The controller sequentially selects each one of the antennae, measures the first quality signal and starts a timer with a time value for the selected antenna. The controller selects a next one of the antennae if the measured first quality signal value is below a threshold value and the timer expires and receives a remainder of a data packet based on the measured first signal quality values for the plurality of antennae.

Abstract: A Doppler spread value of a channel in an Orthogonal Frequency Division Multiplexing (OFDM) system is estimated, wherein the channel comprises a plurality of carrier frequencies. Estimating involves selecting a set of two or more carrier frequencies from the plurality of carrier frequencies. A Doppler spread value is estimated for each of the selected carrier frequencies. An estimate of the Doppler spread value of the channel is produced by combining the estimated Doppler spread values of each of the selected carrier frequencies. For example, the Doppler spread value of the channel may be estimated by averaging the estimated Doppler spread values of each of the selected carrier frequencies.

Abstract: A receiving method and apparatus of an orthogonal frequency division multiplexing access system having multiple antennas that is capable of improving system design and realization of integration degree by reducing complexity of fast Fourier transform (FFT) and noncoherent combination is provided.

Abstract: The present invention describes a receiver assembly for receiving an analog signal and converting the analog signal to a digital signal. The receiver assembly is, preferably, capable of receiving a signal operating at approximately 60 GHz. The receiver assembly includes a filter, a down converter, a demodulator, a latch, a FIFO, and a logic circuit. A method of converting the 60 GHz analog signal to a digital signal is also described.

Abstract: A technique for reducing multipath distortion in an FM receiver, with a plurality of switchable antennas, provides a fast distortion detector that monitors a received signal for significant distortion events of less than about 15 microseconds in duration. In response to a multipath event, the output of the fast distortion detector initiates a search for a lower distortion (better quality) antenna. To prevent frequent antenna searches from causing an audible disturbance, a threshold is introduced to desensitize the fast distortion detector. Threshold decay is a function of an overall received RF signal level. A slow distortion detector is also provided that measures distortions of the received signal relating to signal quality.

Abstract: Analog signal paths are utilized between a baseband processor and a radio front end to support high throughput communications for a multiple in multiple out radio transceiver that support communications over two or more antennas. Specifically, analog differential I and Q path communication signals are exchanged between a radio front end core and a baseband processor to maximize throughput capacity for high data rate signals. Along the same lines, the impedances of traces and the interface are matched to reduce I/Q imbalance.

Abstract: The present invention provides a plurality of embodiments for beamforming in an asymmetrical system wireless communication system (400) of NT (102i) transmit antennae and NR (104j) receive antennae where NT>NR that ensure the transmit power on each antenna is the same, without appreciable loss in performance. Additionally, a technique is provided for choosing fewer beamforming vectors than frequency bins in an OFDM system.

Abstract: In one-tuner smart antennas, a representation of the antenna element wideband signal is correlated with a representation of the smart antenna output signal to give a measure of the selected channel bandpass power and desired signal power. Since only signals in the selected channel bandpass of the wideband antenna signals can be correlated with signals in the selected channel, the correlator allows only the selected channel bandpass components of the wideband antenna input signal to contribute to the correlator output. This eliminates the influence of adjacent channels/bands signals and prevents capture by strong adjacent signals. As the smart antenna adapts and reduces the selected channel bandpass interference, the measure becomes that of the desired signal power. The present invention reduces the distortion and capture of the antenna branch amplitude limiter for the weight calculation, power detection of the input power and AGC of an antenna element.

Abstract: A differential diversity antenna is provided. In one embodiment, a differential diversity antenna is used in a wireless system comprising receiver circuitry. (and, in another embodiment, transmission circuitry). The differential diversity antenna comprises a plurality of antenna components that are aligned non-collinearly to achieve diversity. In another embodiment, the differential diversity antenna is used with a second differential diversity antenna. Other embodiments are disclosed, and each of the embodiments can be used alone or together in combination.

Abstract: A system and method of switching from a first receiver receiving a constant bit rate signal to a second receiver receiving the constant bit rate signal, where the constant bit rate signal received by the first and second receivers is converted to a first baseband signal and a second baseband signal comprising estimating a signal quality metric of the first baseband signal, comparing the signal quality metric to a predetermined threshold, and switching from the first baseband signal to the second baseband signal if the signal quality metric is greater than the threshold.

Abstract: It is a theme of the present invention to provide a diversity receiving device and a receiving scheme switching method, capable of attaining a power saving by executing a switching between a diversity reception and a single reception with high accuracy.

Abstract: A receiving apparatus (2) includes a radio unit (2a) and a main receiving unit (2b) detachably connected with each other, the radio unit (2a) stores radio unit ID information (12a) as identification information to identify the radio unit itself, the main receiving unit (2b) stores a process condition table (16a) in which process conditions corresponding to the radio units are stored, the main receiving unit (2b) includes a setting controller (C1b) which serves as a setting controller that sets the process condition of the main receiving unit (2b), the setting controller (C1b) acquires the radio unit ID information (12a) from the radio unit (2a), selects the process condition of the main receiving unit (2b) corresponding to the acquired radio unit ID information (12a) from the process condition table (16a), and sets the selected process condition as the process condition of the main receiving unit (2b), so that, when a replaceable unit detachably connected to a shared unit is replaced with another replaceable

Abstract: In response to a connection request from a terminal, a base station provides a signal indicating a reception operation adapted to a transmission operation of the base station to the terminal. Based on the indicating signal, the terminal selects and performs the optimum reception operation. The terminal also provides its own reception operation information in advance to the base station. Based on the reception operation information, the base station transmits a reception operation indication to the terminal. These processes are realized with software by a DSP.

Abstract: The present invention provides an improved method for calibrating transmitter and receiver circuits in a device having multiple antennas. The method involves transmitting pilot signals from the device to a second device and from the second device to the device. Each device determines the relative differences between the signals received by a first antenna and by each of the other antennas. The relative differences can then be used to calculate calibration factors that can be applied to the transmitter and receiver circuits.

Abstract: An RF receiver system is provided having a plurality of selectable antennas. The system includes a receiver for receiving RF signals from one of the plurality of antennas at a time. The receiver includes processing circuitry for processing the RF signals and generating a control signal to control selection of one of the antennas at a time. The system further includes a switched diversity module having a plurality of switches coupled to the plurality of antennas for selecting one of the antennas at a time. The switched diversity module further includes logic receiving the control signal generated by the receiver and generating logic output signals to control selection of one of the antennas at a time.

Abstract: In an antenna interface system of a wireless network base station, each sector of the base station is outfitted with two dual-band duplexer assemblies, each of which includes a tower-mounted antenna unit, an RF filter unit (e.g., triplexer), and an RF feed or antenna cable that interconnects the two. One antenna unit transmits in one communication band, and the other transmits in a second band. Both units receive signals over the two bands. The RF filter units pass transmit data on to the cables and filter receive data of both bands for separate output. The antenna units and filter units act as cable-end interfaces for multiplexing and de-multiplexing the transmit and receive data on and off the cables. Thus, each cable carries transmit data for one communication band and receive data for both bands, for a total of two cables per sector for dual-band applications.

Abstract: Disclosed is a method for performing a closed loop mode transmit diversity antenna verification in a mobile communication terminal, the method including estimating an uplink error rate by comparing an antenna complex vector, which is estimated by antenna verification to have been applied to transmit diversity in a base station, with an antenna complex vector reported to the base station; and performing the antenna verification to which the estimated uplink error rate is applied, thereby generating an antenna complex vector estimated to have been applied in the base station.

Abstract: A wireless network device comprises at least two antennas that transmit and receive data packets. An antenna diversity module measures at least one of an average signal to noise ratio (SNR) and an error rate of said data packets during at least one of transmitting and receiving N packets, where N is an integer greater than one, and selects one of said at least two antennas based on said at least one of said average SNR and said error rate.

Abstract: The present invention relates to a data processing device data processing device (1; 1?) for processing signals received via a wireless link, comprising a first beam steering and/or forming antenna (5) arranged on said data processing device (1; 1?) adapted to receive data via said wireless link, a second beam steering and/or forming antenna (6) arranged on said data processing device (1; 1?) in an angle to said first beam steering and/or forming antenna (5), said second beam steering and/or forming antenna (6) adapted to receive data via said wireless link, and processing means (10) adapted to process signals received by said first (5) and said second (6) beam steering and/or forming antenna. The present invention further relates to a similar data processing device adapted to transmit signals via beam steering and/or forming antennas.

Abstract: A method and an arrangement are provided for timing a change of diversity weights in a radio connection between a base station and a terminal. A response timing mode is selected from a number of predefined response timing modes. The terminal is informed about the selected response timing mode. An initiation is received from the terminal and it is responded to the initiation by changing certain diversity weights so that the exact moment of time for effecting the change is determined by the selected response timing mode.