Abstract: An antenna diversity receiver with a variable delay time for antenna switching is disclosed. The antenna diversity receiver includes an antenna selective switching means for coupling one of a plurality of antennas to a RF receiver input. A multipath detector controls the antenna selective switching means. A switching disabling means automatically disables the antenna selective switching means over a disabling period. In order to accurately immunize the receiver the disabling period is controlled by an adjacent channel detector to increase the period with increasing adjacent channel interferences and to decrease the period with descreasing channel interferences.

Abstract: A multiple distributed antenna access point (MDA/AP) system which compensates for wireless path loss and increases data throughput between AP and mobile user stations includes a central unit including one or more central antennas, a distributed antenna unit including multiple distributed antennas and an auxiliary unit interfacing the central unit with the distributed antenna unit, with each unit being separate or the central and auxiliary units being integrated. The central unit functions as a traditional access point and is operable in time division duplex (TDD) or frequency division duplex (FDD) mode. One or more central or distributed antennas are utilized to transmit and receive signals to and from the mobile user stations where selection of the antenna(s) used for a given mobile user station determines the throughput of the transmission.

Abstract: An improved radio frequency (RF) switch circuit is disclosed. The RF switch is typically used in a communication system having one or more transmission paths and one or more reception paths. The RF switch has a first set of diodes connected in parallel among themselves, and a second set of diodes connected in parallel among themselves. Each diode of the second set is coupled with at least one predetermined diode in the first set in a parallel manner by sharing a connection node that is coupled further with at least one antenna. A transmitter is coupled to the first set of diodes and the receiver is separately coupled to the second set of diodes, wherein either one of the first set of diodes or the second set of diodes are activated to establish one path while cutting off all other paths at the same time.

Abstract: A method and apparatus for reducing the observed rate of change of the channel characteristics in a system with multiple antennas at a mobile terminal. The slowing down of the observed channel fluctuations is effectuated on the downlink by either calculating or receiving signals that have a similar Doppler shift, referred to herein as Doppler-compensatable signals, and processing one or more of the Doppler-compensatable signals to compensate for Doppler shift. The slowing down of the observed channel fluctuations is effectuated on the uplink by pre-compensating symbol streams with the Doppler shift associated with the direction in which they are transmitted, so that the observed Doppler shift of these signals when they are received is reduced or even eliminated.

Abstract: An antenna array comprising at least two groups of antennas where each group comprises at least two pairs of antennas. Each of the pairs in a group contains orthogonally polarized antennas and at least one antenna in a pair is similarly polarized to one antenna in at least another pair in the group. The antenna array further comprises circuitry coupled to the antenna groups to select and activate certain antennas in a group to enable the antenna array to operate in either a beam forming/steering mode, a diversity mode or a MIMO mode or any combination thereof. The antennas in the groups are activated based on the characteristics of the signals being transmitted or received by the antenna array.

Abstract: Briefly, a method and apparatus to detect and acquire a frame within a transmission are provided. The apparatus may be coupled to at least two antennas and may include a frame acquisition module to detect and acquire the frame received within a transmission by one of the antennas.

Abstract: In a method for the selection of a local antenna from among a number of local antennas that are spatially distributed in a diagnostic magnetic resonance apparatus, a target volume for the imaging is excited to emit magnetic resonance signals. The magnetic resonance signals are received with the local antennas. A characteristic quantity in the magnetic resonance signals respectively received by the local antennas is determined, this characteristic, for each antenna, quantity representing a measure for the distance of the target region from that local antenna. The local antenna is selected that is located closest to the target region, from among the multiple local antennas, dependent on the characteristic quantity.

Abstract: A radio card sized for insertion into an electronic device. The radio card includes a housing; a radio circuit disposed within the housing; an internal antenna coupled to the radio circuit; at least one external antenna contact, disposed on the housing, coupled to the radio circuit; an electrical interface, disposed on the housing at a location physically separate from that of the at least one external antenna contact; and the at least one external antenna contact and the electrical interface automatically engaging the electronic device upon insertion of the radio card into the electronic device.

Abstract: To enable a use of a two-band type mobile telephone with a dual radiation circuit, a selector switch is placed between this dual radiation circuit and transmission channels in each of these bands. Given the emergence of the second harmonic resulting from the presence of the selector switch, the undesirable components are filtered with a filter. A part of the reactive components of this filter is between the radiating circuit and the selector switch, while the other part is in the channel to be filtered. Depending on the nature of the channel, the other part in the channel to be filtered has different values.

Abstract: An antenna system for use in a communication system is provided. A first antenna is configured to receive a first signal having a first polarization. A second antenna is configured to receive a second signal having a second polarization and configured to receive a third signal having a third polarization. The second polarization is rotated from the first polarization. The third polarization is rotated from the second polarization.

Abstract: A diversity receiver includes a plurality of antennas, a receiving unit for receiving radio waves via the antennas, a phase adjuster disposed for each said antenna and connected thereto for adjusting a phase angle of a radio wave received by each of the antennas to a value to increase gain of each antenna to which the phase adjuster is not connected, and a switching unit, operative in response to a control signal indicating a selected antenna having a best reception state to receive an external radio wave, for connecting the selected antenna to the receiving unit, for disconnecting the selected antenna from the phase adjuster and non-selected antennas other than the selected antenna, and for connecting the non-selected antennas to the phase adjuster associated therewith. The phase adjuster is connected in a stage subsequent to the switching unit viewed from the antennas. This configuration provides a highly efficient diversity receiver.

Abstract: A radio communication system includes a base station having a directional antenna for generating a plurality of beams. A first set of the beams is used to receive signals which are decoded at the base station. A second set of the beams is used for interrogating a cell to identify beams which should be added to the first set of beams (for example, in response to mobile terminals entering the cell). In one embodiment, the second set of beams comprises a plurality of searcher beams produced by a fixed-beam phased array antenna. In a second embodiment, the second set of beams comprises a single searcher beam which is scanned through the cell by an adaptive phased array antenna. The radio communication system can be used to communicate with indoor mobile terminals through a plurality of radio heads, and also can be used to communicate with orbiting satellites.

Abstract: A synchronization system within a dual antenna receiver employs two timing recovery loops each coupled to a different antenna input. Segment sync lock (detection of a segment sync in the data stream) by one timing recovery loop prompts selection of the timing error from the corresponding timing recovery loop for timing recovery within both loops. Both timing recovery loops are then synchronized utilizing the selected timing error. If sync lock for the selected loop is lost, the other loop is selected to provide timing error to both loops.

Abstract: A multiple band transmitter including first and second transmit amplifier paths, where the first transmit amplifier path conducts a first transmit signal at a first frequency band and the second transmit amplifier path conducts a second transmit signal at a second frequency band. The second transmit amplifier path includes an amplifier that generates the second transmit signal along with a harmonic frequency within a passband of the first transmit amplifier path. The second transmit amplifier path further includes a trap circuit that shunts the harmonic frequency away from the first transmit amplifier path.

Abstract: An antenna diversity system includes at least two antennas. Each antenna may be connected via a common connection point to a receiver by a respective switch which presents a low impedance connection between the antenna and receiver in the on state and a substantially reactive load to the antenna in the off state. Selection of appropriate impedances for the off state load enables the antennas to function as an array with a variety of beam patterns depending on the state of the switches. Cycling through a sequence of switch states steers the antenna beam providing improved resistance to fading and multipath effects. Alternatively, the antennas may be connected to a hybrid coupler, which enables two beam patterns to be available simultaneously for signal quality measurement and comparison.

Abstract: A method and apparatus for wireless communications wherein a base station transmits and receives wireless signals through multiple directional antennas mounted on a rotating antenna assembly. Signal beams from each directional antenna sweep in one angular direction through multiple sector coverage areas. As a signal beam crosses from one sector to another, the routing of forward and reverse link signals associated with that signal beam are switched from the sector it is exiting to the sector it is entering.

Abstract: Embodiments of the present invention relate generally to receivers. One embodiment relates to a digital FM receiver having multiple sensors (e.g. antennas). In one embodiment, the digital receiver includes a baseband unit having a channel processing unit. In one embodiment, the channel processing unit is capable of calculating or estimating a phase difference between the incoming signals prior to combining them. One embodiment uses phase estimation method for diversity combining the signals while another embodiment utlizes a hybrid phase lock loop method. Also, some embodiments of the present invention provide for echo-cancelling after diversity combining. An alternate embodiment of the channel processing unit utilizes a space-time unit to diversity combine and provide echo cancelling for the incoming signals.

Abstract: A synchronization system within a dual antenna receiver employs two timing recovery loops each coupled to a different antenna input. The timing error computed within each timing recovery loop is differentiated by a high pass filter and compared to a predefined threshold indicating convergence. Both sampling rates are then synchronized utilizing the timing error from whichever loop converges first. If synchronization lock for the selected loop is lost, the other loop is selected to provide timing error to both loops.

Abstract: The wide bandwidth transceiver includes a receiver section, a transmitter section, and a local oscillation module. The receiver section includes a 1st receiver intermediate frequency (IF) stage, a receiver switch module, and a 2nd receiver IF stage. The 1st receiver IF stage is operably coupled to convert a 1st inbound radio frequency (RF) signal into a 1st inbound IF signal based on a 1st local oscillation of the local oscillation module. The receiver switch module passes either the 1st inbound IF signal or a 2nd inbound RF signal, which have similar carrier frequencies, to the 2nd receiver IF stage. The 2nd receiver IF stage receives the selected signal from the receiver switch module and based on a 2nd local oscillation converts the selected signal into a low intermediate frequency signal. The transmitter section includes a 1st transmitter intermediate frequency (IF) stage, a 2nd transmitter IF stage, a power amplifier and a transmitter switch module.

Abstract: A receiver adapted to receive a signal having at least first and second carrier frequencies on which first and second information signals are modulated, respectively. The inventive receiver further includes circuitry for converting the received signal to a complex baseband signal. In the illustrative embodiment, the received signal includes first and second ensembles. The first ensemble includes a first signal from a first source, a first signal from a second source and a first signal from a third source. The second ensemble includes a second signal from the first source, a second signal from the second source and a second signal from the third source. The receiver is adapted to selectively output the first and/or the second ensemble. Conversion of the band is achieved with quad mixers. The outputs of the mixers are digitized and selectively provided as the first and/or the second ensemble by a digital translation stage.

Abstract: An apparatus and method of for attaching an antenna to a mobile communication device. The apparatus can include radio frequency generation circuitry, a radio frequency feed point coupled to the radio frequency generation circuitry, a direct current voltage source coupled to the radio frequency feed point, and an antenna detection module coupled to the radio frequency feed point and the direct current voltage source. The antenna detection module is configured to detect a type of antenna coupled to the radio frequency feed point based on a detected direct current voltage. The antenna detection module can be coupled to the radio frequency feed point and a ground contact point. The apparatus can additionally include a parameter of operation adjustment module coupled to the antenna detection module. The adjustment circuitry can be configured to adjust a parameter of operation of the mobile communication device.

Abstract: A wireless network transmits digital data. The network includes an active transceiver to transmit carrier waves at a succession of preselected frequencies and a transponder. The transponder transmits digital data to the active transceiver by partially reflecting the carrier waves.

Abstract: A circuit for changing over between the frequency-modulated HF signals of at least two receiving antennas is described, having a control unit that changes over between the individual antennas as a function of the quality of the antenna output signal. A detector is provided which, when a signal that exceeds the defined reception level is no longer being furnished by any of the antennas, applies to the control unit a signal that effects the changeover to a specific antenna.

Abstract: A personal communications apparatus, for example a cellular telephone handset, has an antenna diversity arrangement comprising first and second antennas (102A, 102B) arranged with their polarisation axes slanted with respect to the median plane of the handset body (218). By a suitable choice of inclination angles one of the antennas can be arranged to be substantially vertical in use, whether by right or left handed users, thereby improving received signal strength from a vertically polarised base station. The arrangement also enhances diversity operation, since the correlation between the field strengths received by the antennas is reduced by their relative orientation. When the apparatus is used in a system employing a Code Division Multiple Access (CDMA) techniques, the apparatus preferably includes a 2D Rake receiver for mitigating the effects of multipath fading and interference.

Abstract: A method for managing multipath signals to be demodulated by a receiver with multiple demodulators. The method includes a series of steps, including receiving the multipath signals at a wireless communication receiver device, finding the multipath signals having sufficient signal strength for demodulation, and measuring an arrival time of one of the multipath signals. In one embodiment, the present invention also recites measuring a signal-to-noise ratio (SNR) level of one of the multipath signals, updating a multipath list with the arrival time and the signal-to-noise ratio if the multipath signal is identified based upon the arrival time with one of the multipath signals existing in the multipath list, and identifying newly-found multipath signals and evaluating one of the newly-found multipath signals based on the signal-to-noise ratio for categorization into one of a plurality of states.

Abstract: A diversity receiver with simplified construction, excellent receiving signal quality even with very low fading speeds wherein, on the basis of a signal from a receiving unit capable of detecting the receiving signal intensity, an antenna changeover is effected when the receiving signal intensity falls below a changeover threshold value. When, at the termination of a first lapse time from the first antenna changeover, the receiving signal intensity is below that immediately before the first antenna changeover, an antenna changeover is again effected and any antenna changeover is prevented from being effected for a second lapse time from the second changeover. The second lapse time is set to be longer than the first lapse time.

Abstract: In a multiple portable phone, a first antenna is provided for a first communication system, a second antenna is provided in common to the first communication system and a second communication system. A switching circuit is controlled based on a control signal. A receiving circuit for the first communication system is connected to one of the first and second antennas via the switching circuit. A transmitting and receiving circuit provided for the second communication system is connected to the second antenna. A control unit generates the control signal to control the switching circuit to connect the impedance matching circuit to a path from the second antenna to the transmitting and receiving circuit when the transmitting and receiving circuit carries out a receiving operation using the second antenna while the receiving circuit carries out a receiving operation using the first antenna.

Abstract: A method and apparatus are disclosed for beam selection in a non-stationary subscriber radio unit having a multi-beam antenna array. The disclosed multi-beam antenna array acts in an omni-directional manner whenever signal-to-noise ratio (SNR) performance is sufficient, and excludes individual branches, as necessary, on the basis of SNR performance. A multi-mode approach is used to select appropriate antennas in the multi-beam antenna array. A given mode is established on the basis of the SNR of the received signal. Generally, if the SNR of the received signal satisfies predefined criteria, the non-stationary subscriber radio unit will operate the multi-beam antenna array in an omni-directional-like manner, by equally combining the received signal from each individual narrow-beam antenna branch.

Abstract: A dual-mode Wireless Local Area Network (WLAN) module installed in an electronic device (600) for wireless communication with other electronic devices includes an RF front-end unit (30), two dual-band antennas (40) coupled to the RF front-end unit, a dual-band radio frequency integrated circuit (RFIC) (20) coupled to the RF front-end unit, a dual-band base-band integrated circuit (BBIC) (10) coupled to the RFIC, and an interface unit coupled to both the BBIC and a computer (600). The RF front-end consists of transmitting and receiving paths. The RF front-end unit has antenna diversity control switching circuits (31, 33) for selecting an appropriate antenna and switching circuits (32, 34, 35, 36) for controlling ON/OFF states of transmitting/receiving paths of the RF front-end unit.

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.

Abstract: A radio communication system includes a base station having a directional antenna for generating a plurality of beams. A first set of the beams is used to receive signals which are decoded at the base station. A second set of the beams is used for interrogating a cell to identify beams which should be added to the first set of beams (for example, in response to mobile terminals entering the cell). In one embodiment, the second set of beams comprises a plurality of searcher beams produced by a fixed-beam phased array antenna. In a second embodiment, the second set of beams comprises a single searcher beam which is scanned through the cell by an adaptive phased array antenna. The radio communication system can be used to communicate with indoor mobile terminals through a plurality of radio heads, and also can be used to communicate with orbiting satellites.

Abstract: A multiple data stream processing arrangement includes a receiver/signal processor (14) and a plurality of signal input paths (11, 12) which meet at a junction (36). A junction output from the junction (36) provides a single input to the receiver/signal processor (14). A switching arrangement (16) is associated with the plurality of signal input paths (11, 12). The switching arrangement (16) includes a switch (31, 32) connected in each signal input path (11, 12). Each switch (31, 32) responds to an enable signal to allow a data stream applied to the respective input path (11, 12) to pass on to the junction (36) and to the receiver/signal processor (14). Only one signal input path (11, 12) and respective switch (31, 32) is enabled at any given time.

Abstract: A DECT transmit-receive terminal comprises a plurality of transmit-receive antennas for communicating with a DECT base station, a device for determining the quality of a communications connection between the DECT transmit-receive terminal and the DECT base station, and a means for switching over from one transmit-receive antenna to another transmit-receive antenna, said switch-over means being connected to the determining device for switching over if the quality of the communications connection is below a predetermined threshold. An antenna diversity effect is thus realized for the DECT transmit-receive terminal by means of which the transmission quality of the communications connection is improved.

Abstract: Direction of arrival estimation sections 106a and 106b estimate directions of arrival for communication terminals. Grouping decision section 107 divides the communication terminals that belong to a sector into a plurality of groups based on the results of direction of arrival estimations. Scramble code assignment control section 114 performs assignment control in such a way that a same scramble code is assigned to channels with similar (not necessarily completely the same) directivities.

Abstract: Level detectors 305 to 312 detect reception levels of uplink bursts received by their respective subcarriers/branches, then interpolation sections 313 to 320 estimate reception levels of the next uplink burst from the reception levels of a plurality of uplink bursts detected, select the branch with the maximum estimated value for each subcarrier and sends each subcarrier of the next downlink burst to be transmitted using this selected branch.

Abstract: Events determine the timing of when to change performance, for example when to scan or when to use a prior stored usually best-performance configuration or just a last configuration, for a smart antenna in a fixed or almost fixed usage like a wireless local area network and a television system. Thereby the system maintains unchanged the parameters, such as those that determine the beam form of the smart antenna until monitoring recognizes one or a combination of more than one of the following conditions or event occurrences; the device communicate with another device for the first time; reboot of the device or the device turns on; the received signal exceeds a predetermined bit error rate (BER); the received signal strength indicator (RSSI) is less than a determined RSSI; the received signal goes below a predetermined signal to noise ratio (SNR); and a user's demand.

Abstract: A variation compensating unit that compensates an amplitude variation and phase variation efficiently and that improves system reliability and communication quality. A first combining section generates a first combined signal by combining signal on different transmission paths in which a variation has not occurred. A second combining section generates a second combined signal by combining signal on the different transmission paths in which a variation has occurred. A compensation value calculating section calculates compensation values for compensating variation according to the transmission paths on the basis of the first combined signal, the second combined signal, and signal on each transmission path in which a variation has not occurred or in which a variation has occurred. A compensating section compensates variation dynamically on the basis of the compensation values.

Abstract: The present invention relates to radio systems and, more particularly, to a method and apparatus for receiving radio signals with the aid of beams generated by antenna assemblies. For each of the beams in a first of the antenna assemblies there is a beam in the second of the antenna assemblies that covers the same space area. Signals received by the second are delayed relative to signals received by the first of the antenna assemblies. Then signals from the first antenna assembly are combined with signals from the second of the antenna assemblies. The combined signals derive from beams covering the same space area. Each combined signal is then radio received in a joint radio receiver. A DOA-estimation can be calculated on the basis of radio received signals derived from all beams.

Abstract: A portable receiver comprised of several antennas that are connected to a receiver unit for receiving a signal transmitted by an electromagnetic induction process. The antennas are made in the form of coils, that are carried by a support in such a way that the respective turns of the coils are oriented along different respective axes of an axis system associated with the support. The invention further includes a phase shifting means oriented between the antennas and the receiver unit. The phase shifting means is designed to produce a temporal phase shift corresponding to an angle of (n−1)&pgr;/n, at the frequency of the signal received between induced signals delivered by the antennas (n being the number of antennas).

Abstract: The invention presents a fuzzy basis function network (FBFN) processing device for the beam pointing error correction of the local multipoint distributed system (LMDS). The beam pointing error caused by wind force can affect the performance of the local multipoint distributed system (LMDS). The correction device uses multi-beam planar array antenna to obtain the signal direction-of-arrival (DOA) of a base station and uses fuzzy basis function network (FBFN) algorithm, which includes thirteen normalized Gaussian membership functions and thirteen rules, to estimate the beam pointing error. The simulation results show that the presented FBFN processing device has better performance in transient response, convergence time and steady state value of the averaged square error than the conventional beam pointing error correction devices.

Abstract: A wireless communication device includes a transceiver front end and at least two receive antennas. Each receive antenna is operationally connected to a receiver front end of the transceiver front end only via a respective low noise amplifier. Receive diversity is provided by providing operating power only to one of the low noise amplifiers, for example, only to the low noise amplifier of the receive antenna that receives the largest portion of the received RF power.

Abstract: Signals from antennas A and B are alternately switched by an antenna switch at a predetermined rate. Then, the signals from the antennas A and B are alternately input to a wireless receiving unit. The wireless receiving unit orthogonal-signal-detects the signals received by the antennas A and B, and inputs the detected signals to a branch selecting unit. The branch selecting unit extracts only the signals from either of the antennas from the signals obtained from the antennas A and B, which are alternately arranged in time series, and transmits the extracted signals to a matched filter. A searcher obtains despreading timings from correlation values, and stores the obtained timings in two memories. The searcher obtains despreading timings with large correlation values, and transmits the timings to a despreading unit to perform RAKE reception.

Abstract: The fixation of a coaxial cable between a GPS receiver and a receiver antenna mounted in a vehicle to an earthing conductor allows the elimination of influences due to noise and the improvement of reception even if the GPS antenna and the receiver antenna are mounted on the same mounting board due to reduction in the size of the device.

Abstract: A method and device for achieving space diversity reception in a system that has a first antenna and a second antenna disposed apart from each other over a quarter wavelength of the operating frequency, wherein the first antenna is optimally tuned to a first frequency for receiving signals in an operating mode. In its first function, the second antenna is optimally tuned to a second frequency for transmitting signals in the same mode or for receiving signals in a different mode. In its second function, the second antenna can be tuned to the first frequency so that it also receives signals in the first frequency in the same mode as the first antenna. The signals in the first frequency received by the second antenna are combined with the signals received by the first antenna.

Abstract: To reduce costs in multiple-input multiple-output (MIMO) transmit or receive diversity wireless communications systems an arrangement is described whereby the number of transmit or receive chains can be reduced. Switched antenna selection is used at the transmitter or receiver. Particular advantages are found for nomadic and high speed mobility MIMO user terminals where improvements in capacity are found. In addition improved ability to deal with the effects of spatial fading is achieved. Embodiments using directional antennas in combination with switched selection are also described. These are particularly advantageous for compact user equipment intended for nomadic or mobile use.

Abstract: A scanning antenna diversity system for motor vehicles having at least two antennas mounted in a multi-antenna installation, and connected to a switching logic circuit. The circuit has discrete switching positions, and a reversing position USmax. A receiver is coupled to logic circuitry for receiving a RF signal from one of switching positions or reversing position USmax. There is a diversity processor coupled to and controlled by receiver for producing a derived received signal from the RF signal, with diversity processor cyclically stepping the logic circuitry to another switching position during the presence of receiver interference. There is a maximum level indicator having its input coupled to the antennas, and having its output connected to the controllable logic circuitry for sensing the strongest actual levels of the antenna signals. Level indicator 39 continuously compares the received signals at antennas and activates the logic switching circuit in response to any interference.

Abstract: A diversity receiving apparatus for receiving data that has been primarily modulated and then secondarily modulated includes a plurality of uni-directivity antennas arranged so that they orient in different directions, a signal information detector for detecting signal information of all frequency bands of received signals of each of the uni-directivity antennas, a branch selector for selecting one of received signals of the individual branches received by the uni-directivity antennas, a secondarily modulated data demodulator for demodulating data that has been secondarily modulated as the received signal selected by the branch selector, and a primarily modulated data demodulator for primarily demodulating data that has been primarily modulated as an output signal of the secondarily modulated data demodulator, wherein the branch selector is controlled corresponding to an output signal of the signal information detector.

Abstract: Antenna-gain diversity is obtained in the following manner. A first and a second antenna element (A1,A2) are electro-magnetically coupled. A switchable antenna-coupler (SAC) is switchable between: a first antenna-coupling state (S1) in which the first and the second antenna element (A1,A2) are electrically coupled to an antenna-signal node (N); and a second antenna-coupling state (S2) in which the first antenna element (A1) is electrically coupled to the antenna-signal node (N) and the second antenna element (A2) is electrically coupled to signal ground (GND). This type of antenna-gain diversity is particularly suitable for use in an application which needs to be relatively small in size or relatively inexpensive, or both, such as a cordless telephone, for example.

Abstract: A method and apparatus minimize battery discharge of mobile communication devices in short range wireless radio communication networks by switching receiving antennas to minimize transmitted power for a mobile communication device. Multiple receiving antennas and at least one transmitting antenna are used. The receiving antennas are switched for each mobile communication device to minimize transmitted power required by a mobile communication device. Switching between receiving antennas is accomplished by measuring power of a signal received from a mobile communication device at each receiving antenna, and selecting a receiving antenna based on the measured power. A database of switchings is maintained for the mobile communication devices, and an initial selection of a receiving antenna is based on the last switching or a trend indicated by most recent switchings. Alternatively, the initial switching is to a centrally located receiving antenna.

Abstract: A radio equipment 1000 separates a signal of a specific terminal from signals from adaptive array antennas #1 to #4, based on a reception weight vector calculated by a reception weight vector calculator 20. Reception coefficient vector calculator 22 provides an impulse response of a signal propagation path of the specific terminal. A transmission coefficient vector estimator 32 predicts a propagation path at the time of transmission, from the result of estimation by the reception coefficient vector calculator 22. The transmission weight vector calculator 30 controls, based on the result of prediction by the transmission coefficient vector estimator 32, the antenna directivity at the time of transmission. Thus, degradation of error rate of the down link generated by the time difference between up/down links can be suppressed.