Abstract: A transmitting apparatus groups a data bit sequence to groups each formed of a predetermined number of bits, modulates predetermined bits of one of groups through a frequency shift keying (FSK) modulation method, non-continuously aligns the FSK modulation signals, and transmits the non-continuous FSK modulation signals.

Abstract: Provided is an ultra-wideband pulse generator using a digital scheme. The ultra-wideband pulse generator and a method for generating an ultra-wideband pulse therein can easily generate various ultra-wideband pulses having a random center frequency and bandwidth according to digital control schemes in a pulse-based ultra-wideband wireless communication system.

Abstract: An ultra-wideband (UWB) receiver utilizing an Xn(n>1) device as a signal detector for short pulse(s), impulse(s) or ultra-wideband signal(s). The transmitted signal comes to antenna and passes through a band pass filter (BPF). The signal is fed into an Xn device. The output signal from the Xn device is fed into integration/dump block. The output from the integration/dump block is fed into decision block.

Abstract: Provided is a distance estimation apparatus, system and method for accurately estimating the distance between TX/RX devices by means of low-end hardware in a communication system such as the IEEE 802.15.4a system. The distance estimation apparatus includes an analog-to-digital converter, a parallelizer, a parallel synchronization means, a counter, and a system clock generator. The analog-to-digital converter analog-to-digital converts a received packet signal to generate a serial digital signal, and the parallelizer 1:N parallelizes the serial digital signal. The parallel synchronization means includes an N number of buffers for receiving the output of the parallelizer. A counter outputs a count value for estimation of the propagation delay time of a UWB signal on the basis of the sampling data retained in the parallel synchronization means. The system clock generator generates a system clock in the distance estimation apparatus.

Abstract: A block-coded group modulation method includes generating a symbol by grouping at least one bit of a data bit stream into one group, classifying the symbol into an n number of sections, and generating an n number of initial information bits. Next, the method includes setting up the size of a pulse corresponding to signal energy transmitted through each of the n sections, generating an additional information bit on the basis of the number of cases according to the sequence of the energy sizes, and generating final information bits by inserting the additional information bit into the initial information bits.

Abstract: Provided is an analog-to-digital converter. The analog-to-digital converter includes a resistor string for generating a plurality of reference voltages; a plurality of differential difference amplifiers for detecting zero-crossing points according to interpolation by using the plurality of reference voltages and input signals; and a plurality of comparators for receiving outputs of the plurality of differential difference amplifiers, detecting zero-crossing points according to 4X interpolation, and generating a digital code corresponding to the input signals.

Abstract: Provided is a radio communication system for ultra wideband (UWB) impulse communications and a radio communication apparatus and method thereof. The present patent provides a radio communication system that can minimize power consumption by eliminating a need for carrier detection and sharing transmission/reception time information in UWB impulse communications. The system includes a network coordinator; and one or more devices communicating on a superframe basis in subordination to the network coordinator. The devices perform data transmission/reception in predetermined time slots and then they are inactivated to thereby reduce power consumption.

Abstract: Provided are a receiving apparatus, a receiving method, a phase tracking apparatus, and a phase tracking method of a pulse-based UWB wireless system, which are capable of tracking and compensating phases of signals modulated with different modulation schemes in the same pulse-based UWB receiver system. The receiving apparatus of the UWB wireless system includes an orthogonal channel generating unit for receiving a baseband signal to generate orthogonal channels, a boundary detecting unit for receiving output signals of the orthogonal channel generating unit to detect boundaries of preamble, header and payload signals, a phase tracking unit for tracking and compensating phases of the preamble, header and payload signals output from the boundary detecting units, and a demodulating unit for demodulating output signals of the boundary detecting unit and the phase tracking unit to output data bits.

Abstract: A transmitter using a method of block code-based group modulation includes a grouping unit, a generating unit, and a mapping unit. The grouping unit generates symbols by grouping a data bit stream into N-bit groups, and the generating unit generates a codeword set composed of codewords corresponding to combinations of arrangements of pulses that are generated by a result of grouping to a predetermined number. Next, the mapping unit block-maps a codeword selected from the codeword set to groups constituting the symbols.

Abstract: Provided are an ultra wideband (UWB) system and a method for operating the same. The UWB system includes a baseband unit for modulating/demodulating an impulse data signal and generating a power management control signal using burst hopping information, and an RF transmitting/receiving unit for transmitting/receiving a wireless signal and alternating between power-on/off states according to the power management control signal generated from the baseband unit. The UWB system can reduce power consumption by applying power source to the RF transmitting/receiving unit only at a time interval in which an impulse signal having a short time period and constituting transmitting/receiving data exists.

Abstract: Provided is a distance and position measuring method. A distance measuring method based on packets transmitted and received between a first node and a second node obtains first timing for transmitting a first packet from the first node, second timing for receiving the first packet in the second node, third timing for transmitting a second packet corresponding to the first packet from the second node, fourth timing for receiving the second packet in the first node, fifth timing for transmitting a third packet from the second node, and sixth timing for receiving the third packet in the first node to estimate a clock frequency offset based on the obtained timings, measures a first distance and a second distance based on the clock frequency offset and some of the timings, and measures a distance between the first node and the second node based on the first distance and the second distance.

Abstract: The exemplary embodiment of present invention provides a sampling device and method in a wireless communication system that is capable of precisely measuring a distance by combining data blocks passing through at least two delay paths and performing sampling thereon. To this end, the sampling device includes: a delayer that delays received signals in a block unit; a delay path selector that selects any one of a plurality of delay paths to control the delayer to apply the selected delay path to each block; a sampler that performs sampling for each block delayed by the delayer; a signal processor that combines at least two sampling blocks sampled by the sampler; and a timing tracker that tracks reception timing of the combined signal, wherein the delayer includes at least two selectable delay paths.

Abstract: Provided is a position tracking apparatus and method for low power WPAN/WBAN sensors in a sensor network. A position tracking apparatus collects distance information of adjacent nodes from a plurality of anchor nodes whose positions are known and at least one sensor node whose position is not known, in a sensor network, calculates the shortest path for the anchor node based on the collected distance information of the adjacent node, and classifies nodes into nodes of a first group whose positions are known and nodes of a second group whose positions are not known to select sensor nodes in an adjacent order from the second group to the first group based on the anchor node and detect the positions thereof.

Abstract: Provided is an ultra-wideband pulse generator using a digital scheme. The ultra-wideband pulse generator and a method for generating an ultra-wideband pulse therein can easily generate various ultra-wideband pulses having a random center frequency and bandwidth according to digital control schemes in a pulse-based ultra-wideband wireless communication system.

Abstract: Provided are a position tracking system and a position tracking method. The position tracking system includes at least one target node, a plurality of reference nodes having position information, and a position determination device. An arbitrary reference node among the reference nodes and the target node utilize a distance measurement message to measure a first time of arrival (TOA) and then transmit the first TOA to the position determination device. At least two other reference nodes adjacent to the arbitrary reference node and the target node listen to the distance measurement message to measure a second TOA and then transmit the second TOA to the position determination device, in order to track a position of the target node.

Abstract: Provided is a radio communication system for ultra wideband (UWB) impulse communications and a radio communication apparatus and method thereof. The present patent provides a radio communication system that can minimize power consumption by eliminating a need for carrier detection and sharing transmission/reception time information in UWB impulse communications. The system includes a network coordinator; and one or more devices communicating on a superframe basis in subordination to the network coordinator. The devices perform data transmission/reception in predetermined time slots and then they are inactivated to thereby reduce power consumption.

Abstract: Provided is a communication system for ultra wide band impulse communication, and more particularly, to a communication apparatus and method that can be used in a sensor network or a low-rate wireless personal area network. To be more specific, the present research suggests a transmitter employing multi-coded bi-orthogonal pulse position modulation/demodulation and a method thereof.

Abstract: A casing device for installing a TPMS wireless transmitter in a wheel of an automobile's tire has a lower case and an upper case, wherein the lower case adheres to the outer surface of the wheel and has the same curved surface as the wheel and the upper case includes the wireless transmitter in itself and combines with the lower case and adheres to it. And in a method for transmitting wireless data a transmitter checks predetermined data transmitting conditions before transmitting wireless data to a receiver and transmits data by using TDMA method if the data transmitting condition is satisfied, or else by using CDMA method.