Abstract: A method and apparatus of detecting a frame boundary by using a preamble are provided. The method includes delaying the preamble by a predetermined length of time, wherein the preamble includes an LTF and a code of the (n+1)th one of 2n sync sequences of the LTF is the inverse of a code of the last one of the sync sequences of STF; calculating a correlation value between the preamble and the delayed preamble; and detecting a frame boundary by comparing the correlation value with a threshold correlation value.

Abstract: A method of generating a packet for low energy critical infrastructure monitoring (LECIM) wireless communication is provided. The method includes steps of generating a first bit string by multiplexing a physical layer header (PHR) bit and a physical layer service data unit (PSDU) bit; convolution encoding the first bit string; interleaving the convolution-encoded first bit string; generating a second bit string by multiplexing the interleaved first bit string with a synchronization header (SHR) bit; and modulating the second bit string with a frequency shift keying (FSK) method and a position-based FSK method.

Abstract: A method of generating a packet of a physical layer transmitter of a TV white space (TVWS) wireless personal area network (WPAN) system operating a WPAN service in TVWS is provided. A packet that is generated by the method of generating the packet includes a preamble, a start frame delimiter that is positioned after the preamble, a first physical layer header that is positioned after the start frame delimiter, and a physical layer service data unit that is positioned after the first physical layer header. Here, the first physical layer header represents whether the packet is a ranging packet for ranging, and includes a ranging packet identification bit corresponding to a reserved bit of the second physical layer header in a SUN system and a LECIM system, and a parity bit.

Abstract: A method of generating networks by utilizing a multi-channel so that channels may be efficiently used, inter-channel interference may be avoided, and a network may be energy efficiently managed is provided. Through a super personal area network (PAN) coordinator that manages all networks based on a multi-channel, a PAN capable of avoiding inter-channel interference may be formed. In addition, it is possible to grasp use states of channels used for transmitting and receiving beacon frames, to observe a change in a network topology, and to form an energy efficient PAN.

Abstract: A transmitting apparatus of a WPAN communication system generates a synchronization header, a physical layer header, and a physical layer service data unit, multiplexes the synchronization header and the physical layer header into a bit stream and then modulates the multiplexed bit stream by a first differential phase modulation scheme, modulates the physical layer service data unit by a second differential phase modulation scheme, and multiplexes and transmits a symbol modulated by the first differential phase modulation scheme and a symbol modulated by the second differential phase modulation scheme into a symbol stream.

Abstract: A transmitting apparatus of a WPAN communication system generates a synchronization header, a physical layer header, and a physical layer service data unit, multiplexes the synchronization header and the physical layer header into a bit stream and then modulates the multiplexed bit stream by a first differential phase modulation scheme, modulates the physical layer service data unit by a second differential phase modulation scheme, and multiplexes and transmits a symbol modulated by the first differential phase modulation scheme and a symbol modulated by the second differential phase modulation scheme into a symbol stream.

Abstract: A receiving apparatus receives an FSK signal, converts the FSK signal into a phasor including amplitude and phase, estimates and compensates for a CFO (carrier frequency offset) from the converted phasor, and recovers a data bit from the converted phasor.

Abstract: A method and apparatus of detecting a frame boundary by using a preamble are provided. The method includes delaying the preamble by a predetermined length of time, wherein the preamble includes an LTF and a code of the (n+1)th one of 2n sync sequences of the LTF is the inverse of a code of the last one of the sync sequences of STF; calculating a correlation value between the preamble and the delayed preamble; and detecting a frame boundary by comparing the correlation value with a threshold correlation value.

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: A receiving apparatus receives an FSK signal, converts the FSK signal into a phasor including amplitude and phase, estimates and compensates for a CFO (carrier frequency offset) from the converted phasor, and recovers a data bit from the converted phasor.

Abstract: A method of generating a packet of a physical layer transmitter of a TV white space (TVWS) wireless personal area network (WPAN) system operating a WPAN service in TVWS is provided. A packet that is generated by the method of generating the packet includes a preamble, a start frame delimiter that is positioned after the preamble, a first physical layer header that is positioned after the start frame delimiter, and a physical layer service data unit that is positioned after the first physical layer header. Here, the first physical layer header represents whether the packet is a ranging packet for ranging, and includes a ranging packet identification bit corresponding to a reserved bit of the second physical layer header in a SUN system and a LECIM system, and a parity bit.

Abstract: A method of generating networks by utilizing a multi-channel so that channels may be efficiently used, inter-channel interference may be avoided, and a network may be energy efficiently managed is provided. Through a super personal area network (PAN) coordinator that manages all networks based on a multi-channel, a PAN capable of avoiding inter-channel interference may be formed. In addition, it is possible to grasp use states of channels used for transmitting and receiving beacon frames, to observe a change in a network topology, and to form an energy efficient PAN.

Abstract: A pulse generator of an ultra wideband (UWB) system includes: a plurality of delay cells for receiving pulses, delaying the received pulses for a predetermined time, and outputting the delayed pulses; and an edge combiner connected to output ends of the plurality of delay cells for receiving the delayed pulses from the plurality of delay cells, outputting fine pulses corresponding to the delayed time, and generating one impulse signal with the outputted fine pulses. The edge combiner includes a plurality of XOR gates for receiving a first delayed pulse and a second delayed pulse from an nth delay cell and an (n+1)th delay cell among the plurality of delay cells and generating fine pulses, respectively, and an OR gate for receiving a first fine pulse and a second fine pulse respectively output from a first XOR gate and a second XOR gate included in the plurality of XOR gates.

Abstract: A high frequency transmitting and receiving apparatus of a wireless communication system low-noise amplifies a signal that is received from a transmitting and receiving antenna through a low noise amplifier in a reception mode, and amplifies a signal be transmitted through a power amplifier in a transmission mode and transmits the signal through the transmitting and receiving antenna, and the high frequency transmitting and receiving apparatus is connected between the transmitting and receiving antenna and the low noise amplifier and turns on a switch in a reception mode and turns off the switch in a transmission mode, thereby separating transmitting and receiving signals.

Abstract: A human body communication system is disclosed, which includes a plurality of intra-body communication apparatuses, a plurality of extra-body communication apparatuses, a bridge apparatus, and an access point. The bridge apparatus manages connections between the intra-body communication apparatuses and the extra-body communication apparatuses, and performs packet exchange. The access point performs packet exchange between a plurality of bridge apparatuses. The bridge apparatus performs negotiation with communication apparatuses to set up a connection, and manages a path based on the connection setup.

Abstract: A digital phase-locked loop apparatus using FSK includes a PFD detecting phase differences between a reference clock and a frequency-divided signal, and a first adder for generating first digital control codes by adding first digital codes, second digital codes, and channel frequency codes including channel information to each other, the first digital codes being converted from time differences between first and second pulses. The apparatus further includes a digital filter correcting errors of the first digital control codes to generate second digital control codes, a DCO for varying an oscillating frequency in accordance with a digital tuning word based on the second digital control codes, and a dual modulus division unit dividing the oscillating frequency into a frequency-divided signal.

Abstract: In a local wireless communication system, a reception signal including an STF (short training field) in which a plurality of patterns are repeatedly transmitted is received, the STF including a first number of STF patterns and a second number of STF patterns, the second number of STF patterns having an opposite code to that of the first number of STF patterns. In a first frequency offset estimation and correction process and a second frequency offset estimation and correction process, frequency offset estimation is performed on a plurality of STF patterns to acquire a phase error of each sample constituting the STF patterns, and the frequency of the STF patterns is corrected based on the acquired phase error. Cross correlation is performed on a predetermined number of STF patterns, among a plurality of STF patterns output subsequent to the frequency offset estimation and correction, to detect frame timing.

Abstract: A method of generating a packet for low energy critical infrastructure monitoring (LECIM) wireless communication is provided. The method includes steps of generating a first bit string by multiplexing a physical layer header (PHR) bit and a physical layer service data unit (PSDU) bit; convolution encoding the first bit string; interleaving the convolution-encoded first bit string; generating a second bit string by multiplexing the interleaved first bit string with a synchronization header (SHR) bit; and modulating the second bit string with a frequency shift keying (FSK) method and a position-based FSK method.

Abstract: An apparatus for transmitting WPAN (Wireless Personal Area Network) MAC (Medium Access Control) frames includes a transport frame management unit for creating MAC transport frames if data is generated from an upper protocol and application layer unit, classifying the created MAC transport frames by kinds, and managing the classified MAC transport frames by queues, a transport memory control unit for transmitting the transport frames at a high speed, and a transport frame transmission unit for responsible for the transmission of the transport frames by judging the transmission time of the frames.

Abstract: An FIR filter of a DS-CDMA UWB modem transmitter and a control method thereof are disclosed. The FIR filter includes an LUT control device for outputting a resultant value of “0” to all adders if data values corresponding to upper three chips H2, M2 and L2 and lower three chips H, M and L are “000000”, and discriminating which group between a first group and a second group the upper/lower data values belong to if the upper/lower data values are not“000000”. The LUT control device provides upper or lower LUT values to the adders using the upper or lower LUT values as they are, or converts the upper or lower LUT values into 2's complements and provides the converted values to the adders according to the discriminated first or second group.