A circuit board for wireless communications includes communication circuitry for modulating and/or demodulating a radio frequency (RF) signal and an antenna apparatus for transmitting and receiving the RF signal, the antenna apparatus having selectable antenna elements located near one or more peripheries of the circuit board. A first antenna element produces a first directional radiation pattern; a second antenna element produces a second directional radiation pattern offset from the first radiation pattern. The antenna elements may include one or more reflectors configured to provide gain and broaden the frequency response of the antenna element. A switching network couples one or more of the selectable elements to the communication circuitry and provides impedance matching regardless of which or how many of the antenna elements are selected. Selecting different combinations of antenna elements results in a configurable radiation pattern; alternatively, selecting several elements may result in an omnidirectional radiation pattern.

Circuit board having a peripheral antenna apparatus with selectable antenna elements

Frequency translation and applications of same are described herein, including wireless local area network (WLAN) applications such as IEEE Standard 802.11 WLANs. Such applications include, but are not limited to, frequency down-conversion, frequency up-conversion, enhanced signal reception, unified down-conversion and filtering, and combinations and applications of same.

Wireless local area network (WLAN) technology and applications including techniques of universal frequency translation

A programmable logic device (“PLD”) is augmented with programmable clock data recover (“CDR”) circuitry to allow the PLD to communicate via any of a large number of CDR signaling protocols. The CDR circuitry may be integrated with the PLD, or it may be wholly or partly on a separate integrated circuit. The circuitry may be capable of CDR input, CDR output, or both. The CDR capability may be provided in combination with other non-CDR signaling capability such as non-CDR low voltage differential signaling (“LVDS”). The circuitry may be part of a larger system.

Clock data recovery circuitry associated with programmable logic device circuitry

A receiver receives signals and noise over a frequency spectrum of a desired received signal. The desired received signal is spread using code division multiple access. The received signals and noise are demodulated to produce a demodulated signal. The demodulated signal is despread using a code uncorrelated with a code associated with the desired received signal. A power level of the despread demodulated signal is measured as an estimate of the noise level of the frequency spectrum.

Automatic power control system for a code division multiple access (cdma) communications system

PROBLEM TO BE SOLVED: To provide a mobile communication system in a multi-carrier transmission scheme, which is adapted for optimal directivity control in an overall band. SOLUTION: A spatial profile is calculated from a correlation matrix obtained by a plurality of pilot-signal correlation operation units 21 that perform mutual correlation operation between a pilot signal and a group of sub-carrier signals at every divided band, which are received by an array antenna 1 and a correlation-matrix generation unit 22 that, based on outputs of the pilot-signal correlation operation units, synthesizes correlation values between sub-carrier signals received by different elements of the array antenna, and then direction estimation is performed. Direction estimation accuracy at every divided band is secured even under frequency selective fading. Furthermore, it is possible to achieve optimal directivity control in the overall band and reduce interference between users by calculating an angular spread in the overall band and adaptively changing over a method of directivity control depending on the angular spread. COPYRIGHT: (C)2011,JPO&INPIT

Device and method for estimating arrival direction

A receiving apparatus includes a base-band conversion circuit, a synchronizing circuit/code generator and a demodulator. The base-band conversion circuit converts a received signal into a base-band signal. The synchronizing circuit/code generator detects a spread code included in the received signal to generate a plurality of spread codes in synchronization with the spread code included in the received signal. The demodulator uses the plurality of spread codes supplied by the synchronizing circuit/code generator to demodulate the base-band signal.

Spread spectrum receiving apparatus

A path detector detects multipath waves on a transmission line based on a plurality of despread signals corresponding to fixed directional beams. An adaptive beam forming section forms an adaptive beam combined signal for each path, using a weight generated by an adaptive algorithm and the despread signals. An adder combines the adaptive beam signal for all paths, and a data judging section judges data included in the combined signal.

Adaptive antenna receiver

A communication control unit in accordance with the present invention comprises a channel quality detection unit that includes a differential block for calculating a double differential phase by performing a plurality of times differential on a received signal and a signal lagging behind the received signal by a predetermined time, a frequency calculation block for calculating a frequency by which the double differential phase falls into a pseudo-error area within a predetermined observation time, and a quality index calculation block for calculating an index of the quality of a channel on the basis of an output of the frequency calculation block, and that calculates an index of the quality of a channel employed using a received signal, a quality decision unit for deciding from the result of channel quality index calculation performed on the channel employed which is provided by the channel quality detection unit whether or not a channel is good, a control unit for controlling the channel according to the result of channel quality decision which is provided by the quality decision unit. Consequently, the communication control unit can achieve channel control successfully.

Communication control unit for mobile communication systems and the like, including a channel quality detection unit, a quality decision unit and a control unit

On the transmission side provided are a data modulation control section (4) for setting a predetermined parameter required for demodulation, subcarrier group modulating sections (6a to 8c) for performing frequency-spreading in units of a subcarrier signal of subcarriers according to the setting, and time-spreading sections (10a to 10c) for multiplexing all the signals after the modulation and frequency spreading in units of a subcarrier signal so as to time-spread the multiplexed signal. On the reception side provided are time-despreading sections (35a to 35c) for performing time-despreading in units of a subcarrier signal and subcarrier group demodulating sections (36a to 38c) for performing frequency-despreading in units of a subcarrier signal time-despread.

Hiroyasu Sano

Papers

Spread spectrum receiving apparatus

Adaptive antenna receiver

Communication control unit for mobile communication systems and the like, including a channel quality detection unit, a quality decision unit and a control unit

Multi-carrier CDMA communication device, multi-carrier CDMA transmitting device, and multi-carrier CDMA receiving device