Patent application number | Description | Published |
20080212693 | Transmitter and Receiver for Ultra-Wideland Ofdm Signals Employing a Low-Complexity Cdma Layer for Bandwidth Expansion - A method and apparatus for transmitting and receiving high-bandwidth OFDM signals, while limiting the complexity of the OFDM signal processing is described. Bandwidth expansion is achieved by repetition of whole OFDM symbols with the polarity of repetitions determined by a long PN code. This technique ensures a perfectly white spectrum. Use of zero-suffix OFDM symbols allows a large tolerance to multipath channels, even while maintaining a single, low-rate RAKE finger for despreading in the receiver. | 09-04-2008 |
20080299931 | System, Apparatus, and Method for Multi-Band Ofdm Systems with Receiver Antenna Selection Per Sub-Band - The present invention provides a system ( | 12-04-2008 |
20090055123 | DISTANCE BASED ASSOCIATION FOR ULTRA WIDE BAND (UWB) WIRELESS PERSONAL AREA NETWORK (PAN) DEVICES - Methods and wireless communication device for associating UWB (Ultra Wide Band) WPAN devices through the processing of ranging information. Ranging information represents the distance between a device and another device. Devices can automatically determine whether association has occurred via evaluation of, e.g., changes in distance, velocity and/or acceleration of devices, optionally in conjunction with a user-gated technique. The association between two wireless devices is carried out automatically when the distance between them is below a certain threshold. In a different embodiment, said distance information is used together with user-gated information to take a decision on associate or not associate two devices close to each other. Said user-gated information may be a confirmation given by the user to associate, e.g. through a button, etc. | 02-26-2009 |
20090185642 | AUTOMATIC GAIN CONTROL USING SIGNAL AND INTERFERENCE POWER TO OBTAIN EXTENDED BLOCKING PERFORMANCE - In a radio including analog and digital portions, with at least one A/D converter between the analog and digital portions, and the selectivity of the radio at least partly implemented in the digital domain, an AGC controller sets a first variable gain amplifier (VGA) ( | 07-23-2009 |
20090316667 | GSM HARMONIC EMISSION DESENSITIZATION IN 5-GHZ WLAN - A method for improving data communication quality in collocated GSM and WLAN subsystems. The GSM device can spuriously emit third harmonics whose frequencies depends on which GSM channel is presently being used. The WLAN receiver uses OFDM subcarriers that can be interfered with by third harmonics of particular ones of the GSM channels. Which OFDM subcarriers would be adversely affected by a particular one of the GSM channels being in use is computed. Then a corresponding particular OFDM subcarrier is deleted after a FFT process and before Viterbi decoding. | 12-24-2009 |
20100061474 | FFT SPREADING AMONG SELECTED OFDM SUB-CARRIERS - An improved communications system for frequency-selective fading channels spreads the data-bearing modulation symbols across many OFDM sub-carriers using a discrete Fourier transform (FFT) at the transmitter, and despreads them using an inverse discrete Fourier transform (IFFT) at the receiver. An IFFT is included at the transmitter to form the OFDM symbols in the usual way, and a corresponding FFT is used at the receiver for the frequency-domain processing of the received signal. The difference is, the size of the FFT used for spreading at the transmitter is smaller than that of an IFFT used just after the FFT to create the OFDM symbols for transmission. This results in improved bit-error-rate, similar to single carrier block transmission (SCBT), while retaining the frequency domain benefits of conventional OFDM, e.g., low out of band emissions and the ability to control the power spectral density using active interference cancellation and other frequency-domain techniques. The improved frequency diversity is especially useful in the higher data rate modes of WLAN or WiMedia Physical Layer Standards, and in other cases where low redundancy forward error correction is employed. | 03-11-2010 |
20100165956 | OFDM COGNITIVE RADIO WITH ZERO OVERHEAD SIGNALLING OF DELETED SUBCARRIERS FREQUENCIES - A system, device and method are described for suppressing certain sub-carrier frequencies within a multi-path transmission system and efficiently notifying a receiver ( | 07-01-2010 |
20100184391 | SWEPT NOTCH ULTRA WIDE BAND (UWB) TRANSMITTER - A UWB or other transmitter reduces interference to a narrow-band victim receiver on a periodic basis by means of a frequency swept notch. The notch may be created using active interference cancellation signal processing or simple deletion of sub-carriers. Details are given of both methods. | 07-22-2010 |
20100281261 | DEVICE AND METHOD FOR NEAR FIELD COMMUNICATIONS USING AUDIO TRANSDUCERS - Secure wireless communication links are established between proximately-located devices, each of which includes respective audio transmitters and audio receivers. The audio transmitter of the first device can be used to transmit a device-dependent authentication key, which is received by the audio receiver of the second device. The audio transmitter of the second device can be used to transmit an acknowledgement, which is received at the audio receiver of the first device. The round-trip time from transmitting the authentication key from the first device to receiving the acknowledgement at the first device can be determined, and the decision of whether to establish the secure wireless communication link can be based on the determined round-trip time. In certain embodiments, these steps can be repeated starting with the second device to establish a two-way trust between the devices. | 11-04-2010 |
20110010551 | SHARED ENCRYPTION KEY GENERATION VIA ACCELEROMETER DIGITIZATION - An apparatus and method for generating a shared secret between at least two wireless portable electronic devices. A shared secret is generated by holding together the at least two devices and shaking them. An acceleration of the at least two devices is measured at least during a time window beginning at a time corresponding to when a magnitude of the acceleration exceeds a predetermined threshold. The acceleration is sampled, resulting in a plurality of vectors, such that a first vector is an initial sample of the acceleration during the time window. In some embodiments, the acceleration is measured in three dimensions. Dot products are calculated between the first vector and each of a plurality of subsequent vectors, resulting in an array of scalars. At least a portion of this array is used to generate the shared secret between the at least two devices. | 01-13-2011 |
20110019773 | SIGNAL PROCESSING CIRCUIT AND METHOD WITH FREQUENCY UP-AND DOWN-CONVERSION - A signal processing circuit comprises a frequency up-conversion circuit ( | 01-27-2011 |
20110122929 | Serialization of multi-band sequence keying for ultra wideband receiver architecture with reduced complexity and power consumption - By partially serializing the transmission of a sequence keyed UWB symbol (FIG. | 05-26-2011 |
20110161543 | Memory Management - An Accelerated Storage Controller (ASC) in an electronic device allows both conventional (slower) application processor to memory interfaces to be employed transparently to existing software, while also allowing software configuration to realize an accelerated storage architecture on demand. Some use cases for the electronic device do not require accelerated storage, and a bypass mode does not require any modification to existing software. Other use cases (such as fast download of multiple gigabytes of media) benefit from an accelerated storage architecture offloading transfer from the electronic device application processor, but could also work with the traditional processor to memory interface, at the cost of slower downloads. Embodiments of the present invention provide for both these possibilities in a software-configurable architecture. Furthermore, a number of other connectivity options are provided under software control to optimize performance and connectivity for different use case scenarios. | 06-30-2011 |
20110221521 | Active Eye Opener for Current-Source Driven, High-Speed Serial Links - A current boost circuit acts as an “eye opener” for a digital bus line. A controlled current injects a fraction of the normal signaling current magnitude from a source driver onto the bus line, after a transition between the two logical states on the bus line is detected. The duration of the additional current injection is a fraction of the unit interval. In one embodiment, a linear system uses the summation of a proportional boost current and a delayed and negated proportional boost current. In another embodiment, a positive or negative edge detection circuit triggers a monostable pulse generator that controls the injection of short bursts of additional current into the bus lines. In some embodiments the boost current is suppressed when the bus line is driven from a driver other than the source driver. | 09-15-2011 |