Abstract: A system and method of managing network resources is provided, in which a noise threshold for an access node is set, the access node being configured for communication in both of a first and a second communication mode; a noise parameter in a band of the first communication mode is monitored; a join request is received from a wireless device, the wireless device being configured for communication in both of the first and the second communication mode; the noise parameter is compared to the noise threshold; in response to a determination that the noise parameter does not exceed the noise threshold, the wireless device is assigned to the first communication mode; and in response to a determination that the noise parameter exceeds the noise threshold, the wireless device is assigned to the second communication mode.

Abstract: A voltage detection circuit includes a tunable delay circuit that receives a supply voltage and that generates a delayed signal in response to an input signal. A control circuit causes a first adjustment in a delay provided by the tunable delay circuit to the delayed signal. An error detection circuit generates an error indication in an error signal in response to a change in a timing of the delayed signal relative to a clock signal caused by the first adjustment in the delay provided to the delayed signal. The control circuit causes a second adjustment in the delay provided by the tunable delay circuit to the delayed signal in response to the error indication. The error detection circuit causes the error signal to be indicative of the supply voltage reaching a threshold voltage after the second adjustment in the delay.

Abstract: According to embodiments, a radar system includes: at least one radio receiver which is comprised of: an antenna configured to receive RF data including both the direct-path RF signal transmitted from a radio transmitter and a reflected RF signal when the transmitted RF signal is reflected from the target; a memory configured to store the same predetermined RF waveform profile data used by the transmitter to generate and transmit the RF signal; a timing unit to provide timing; a matched filter application configured to generate and apply a matched filter for identifying RF signal signatures in RF data; and one or more processors configured to: (i) analyze the received RF data to identify multiple, repeated, individual RF signals corresponding to the direct-path transmitted RF signal; (ii) split the identified RF signals corresponding to the direct-path transmitted RF signal into a plurality of repeating units each having an interval time; (iii) create a matched filter using the predetermined transmit waveform

Abstract: A method is provided for radar ranging using an IR-UWB radar transceiver. The range is determined by measuring a time required by a transmitted pulse to be reflected by an object and returned to the transceiver. The method includes transmitting a ranging signal having a predetermined sequence of positive and negative pulses using a transmitter of the transceiver. A receiver of the transceiver receives a signal having a reflected portion and a feedthrough portion. In the method, the receiver cancels the feedthrough portion using a delayed pulse polarity signal such that when the delayed pulse polarity signal is multiplied and accumulated with the received signal, the feedthrough portion is canceled, and the reflected portion is amplified. In another embodiment, a transceiver is provided that cancels the feedthrough portion while amplifying the reflected portion. Cancelling the feedthrough portion allows short-range operation by removing a blind range of the transceiver.

Abstract: Provided is a counter unit capable of supporting any output apparatus of single-phase output, two-phase output, or three-phase output without waste. A counter unit (10) is provided with: a plurality of signal input terminals to which pulse signals outputted from a plurality of external output apparatuses (50) are respectively inputted; input circuits (21a to 21f) respectively connected to the plurality of signal input terminals; a single-phase counter (13) that performs count on the basis of a single-phase pulse signal, and a multi-phase counter (15) that performs count on the basis of a multi-phase pulse signal; and a switching part (16) that switches whether the input circuits (21a to 21f) are connected to the single-phase counter (13) or the multi-phase counter (15).

Abstract: Trans-filter/Detectors are extremely sensitive circuits that recover exponentially modulated signals buried in noise. They can be used wherever Matched Filter/Coherent Detectors are used and operate at negative input signal-to-noise ratios to recover RADAR, SONAR, communications, or data signals, as well as reduce phase noise of precision oscillators. Input signal and noise is split into two paths where complementary derivatives are extracted. Outputs of the two paths are equal in amplitude and 180 degrees relative to each other at the band center frequency. The outputs are summed, causing stationary in-band noise to be reduced by cancellation while exponentially modulated signals are undiminished. Trans-filters are Linear Time Invariant circuits, have no noise x noise threshold and can be cascaded, increasing output signal-to-noise ratio prior to detection. Trans-filters are most sensitive to all types of digital modulation, producing easily detected polarized pulses synchronous with data transitions.

Abstract: A UE, as a part of a RACH communication procedure, may transmit a first sequence within a first set of resources having a first SCS and a second sequence within a second set of resources having a second SCS greater than the first SCS. The second sequence is transmitted with a cyclic prefix greater than inverse of the first SCS divided by a sequence length of the first sequence. The first sequence is a first PRACH preamble. The second sequence may be a second PRACH preamble, an SRS sequence, or DMRS. The UE may repeat the transmission of the first sequence for a first number of times and repeat the transmission of the second sequence for a second number of times independent of the first number.

Abstract: A system and method of managing network resources is provided, in which a noise threshold for an access node is set, the access node being configured for communication in both of a first and a second communication mode; a noise parameter in a band of the first communication mode is monitored; a join request is received from a wireless device, the wireless device being configured for communication in both of the first and the second communication mode; the noise parameter is compared to the noise threshold; in response to a determination that the noise parameter does not exceed the noise threshold, the wireless device is assigned to the first communication mode; and in response to a determination that the noise parameter exceeds the noise threshold, the wireless device is assigned to the second communication mode.

Abstract: Aspects of the disclosure include an apparatus at base station side in a wireless communication system for multi-user superposition transmission. The apparatus includes a superposition control unit and an indication generation unit. The superposition control unit is configured to insert, into a data stream of each user equipment in a group of user equipment comprising a plurality of user equipment, a demodulation reference signal corresponding to the data stream, and superpose demodulation reference signals corresponding to data streams of respective user equipment. The indication generation unit is configured to generate, for at least a first user equipment among the plurality of user equipment, an indication regarding a demodulation reference signal corresponding to a data stream of other user equipment among the plurality of user equipment, to assist the first user equipment in demodulating data transmitted in the multi-user superposition transmission.

Abstract: A communication interference rejection system comprising a receiver operatively connected to a device connected to a body of a user. The receiver is configured to receive a signal transmitted through the body of the user, the signal comprising a data component and an interference component, the interference component due to human body antenna effect. The receiver is configured to integrate the signal using a relatively low-gain analog integrator and then digitally differentiate the output of said integration.

Abstract: The present invention relates to an optical channel sounding transmitter apparatus, comprising an optical signal generator for generating an optical carrier signal; an optical modulator for modulating the optical carrier signal with a predetermined training sequence to obtain an modulated optical signal; a first optical transmitter for transmitting the optical carrier signal; and a second optical transmitter for transmitting the modulated optical signal. Further the present invention relates to a coherent optical channel sounding receiver apparatus, comprising a first optical receiver for receiving an optical carrier signal over a first optical channel; a second optical receiver for receiving a modulated optical signal over a second optical channel; an optical down converter for down converting the modulated optical signal using the received optical carrier signal to obtain a down converted signal; and a channel estimator for estimating a channel characteristic of the second optical channel.

Abstract: The present invention relates to a wireless communication system and a method thereof. The wireless communication system comprises a signal encoding module for encoding a preset high-frequency audio signal frequency according to a preset encoding rule, and creating an encoding library for storing the code; a signal sampling module for sampling a high-frequency audio signal produced by a high-frequency audio signal generating device; a signal transformation module for performing Fourier transformation on the sampled audio signal firstly to transform the audio signal into frequencies, acquiring a main frequency from the transformed frequencies, and storing the acquired main frequency; a signal decoding module for decoding the main frequency into a preset code according to the code in the library; and an output module for outputting the decoded code. The wireless communication system and the method of the present invention do not need hardware supports, thereby reducing the cost.

Abstract: The present invention provides a radio communication system which includes a plurality of radio base station apparatuses that transmit reference signals orthogonal to each other among a plurality of transmitting antennas and a mobile terminal apparatus that performs channel estimation based on the reference signals transmitted from the plurality of radio base station apparatuses, sets priority among a plurality of neighboring radio base station apparatuses and introduces a bias in the number of reference signals that can be allocated to each radio base station apparatus according to the priority from the radio resources shared among the plurality of neighboring radio base station apparatuses.

Abstract: The present disclosure provides for the construction and use of a set of Zero-Correlation-Zone (ZCZ) Concatenated Complementary Pair (CCP) sequences with zero-correlation-zone range greater than one or with zero-correlation-zone range equal to one and the sequence set size greater than two. Complementary pair sequences A and B are selected and, for each member of the set of ZCZ CCP sequences, sign sequences pA and pB are combined with the complementary pair sequences to form a member ZCZ CCP sequence of the set. A ZCZ CCP sequence modified by propagation over a communication channel may be identified by cross-correlation with ZCZ CCP sequences of the set. A set of sign sequences may be constructed by recursive expansion from an initial set or found by a computer search. The sequences may be used in a transceiver of a portable electronic device or other communication device.

Abstract: Provided are transmitter topology, receiver topology and methods for generating and transmitting a radio signal at a transmitter and detecting and processing a radio signal at a receiver. The radio signals are transmitted across a wireless interface using Ultra Wideband (UWB) pulses. A transmitted reference approach is utilized. The radio signal include pairs of UWB pulses with each pair of pulses separated by a fixed time delay. The two pulses are then combined to provide for improved noise immunity.

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 circuit to generate Orthogonal Variable Spread Factor (OVSF) codes for CDMA systems. The circuit includes a shift register to determine the OVSF code k for a given spread factor SF, wherein k ranges between 0 and (SF?1). A memory cell register stores the leftmost bit of the code that is loaded into the first bit of the shift register. An XOR gate provides an input to the shift register after the first bit is loaded from the memory cell. An address Look Up Table (LUT), or state machine, is connected to the shift register to select a tap output from one of the shift register bits to provide a first input to the XOR gate. A secondary OVSF code register connects to a second input of the XOR gate to provide code bits from lower SF values making up the code from the current SF value.

Abstract: In various embodiments, the present invention includes a method for direct spread modulating data for wireless transmission at a 5 Gigahertz band or other frequency bands via wireless devices. Such wireless transmissions may occur in a wireless network having protection mechanisms to allow such wireless devices to co-exist with other devices not capable of such modulation.

Abstract: A time domain communications system wherein a broadband of time-spaced signals, essentially monocycle-like signals, are derived from applying stepped-in-amplitude signals to a broadband antenna, in this case, a reverse bicone antenna. When received, the thus transmitted signals are multiplied by a D.C. replica of each transmitted signal, and thereafter, they are, successively, short time and long time integrated to achieve detection.