Abstract: Disclosed are an apparatus and a method for determining an identity of a WLAN system occupying a channel, using information within a signal field or time synchronization between target channels. For this, the present invention includes a preamble detecting unit configured to detect a preamble in each channel; a channel information obtaining unit configured to obtain reference time information when the preamble is detected in each channel, or to obtain signal field information in each channel using the detected preamble; and an identity determining unit configured to determine an identity of a WLAN system occupying each channel by comparing the reference time information obtained in each channel, or by comparing the signal field information obtained in each channel.

Abstract: The present invention relates to a method and apparatus for managing a backup channel in a multi-channel environment. According to an aspect of the present invention, the method of managing a backup channel in a multi-channel environment includes transmitting a control region of a super frame through a first channel constituting the multi-channel and transmitting a data region of the super frame to a destination terminal through a second channel constituting the multi-channel. A transmission quality of the first channel is acquired using the control region transmitted through the first channel.

Abstract: A method and apparatus for detecting a heterogeneous communication system is provided. The apparatus include a radio frequency (RF) signal reception unit configured to receive a signal from a particular communication system, a silent duration evaluation unit configured to evaluate a silent duration between frames on the basis of the received signal, and a system type decision making unit configured to determine the type of the particular communication system on the basis of the evaluated silent duration.

Abstract: Provided is an apparatus for controlling subcarrier spacing in a system supporting multiple frequency bands. The apparatus for controlling a subcarrier spacing comprises: an interference detection unit detecting interference over multiple frequency bands; a system parameter provision unit providing system parameters related to a subcarrier spacing between the multiple frequency bands—for example RF, FFT size, and channel bandwidth; a subcarrier spacing control unit controlling the subcarrier spacing such that the detected interference is reduced, on the basis of the system parameters. In a system operating with multiple bands, different subcarrier spacing can be applied by each band, thereby controlling interference occurring in each band.

Abstract: A communication method of a transmitter using a preamble in a wireless communication system, includes determining at least two subcarriers from among a plurality of subcarriers, for the preamble; mapping a subcarrier sequence and a subcarrier phase value of the preamble to the at least two subcarriers; and transmitting the preamble using the at least two subcarriers. The preamble may include a real component having a first repeated pattern in a preset time interval, and an imaginary component having a second repeated pattern in the preset time interval, and a relationship between the first repeated pattern and the second repeated pattern may indicate characteristic information of the wireless communication system.

Abstract: The present invention relates to a method and apparatus for managing a backup channel in a multi-channel environment. According to an aspect of the present invention, the method of managing a backup channel in a multi-channel environment includes transmitting a control region of a super frame through a first channel constituting the multi-channel and transmitting a data region of the super frame to a destination terminal through a second channel constituting the multi-channel. A transmission quality of the first channel is acquired using the control region transmitted through the first channel.

Abstract: A method and apparatus for detecting a heterogeneous communication system is provided. The apparatus include a radio frequency (RF) signal reception unit configured to receive a signal from a particular communication system, a silent duration evaluation unit configured to evaluate a silent duration between frames on the basis of the received signal, and a system type decision making unit configured to determine the type of the particular communication system on the basis of the evaluated silent duration.

Abstract: A method and an apparatus for transmitting a packet in a communication system are provided. The method for transmitting a packet in a communication system includes receiving a compression packet use request message from a receiver; generating a specific preamble and transmitting the compression packet to a receiver; wherein the compression packet is generated by omitting information on overlapping frame header among a frame to be transmitted and attaching the specific preamble including the information on the omitted frame header.

Abstract: There is a provided a method for managing a multiple frequency assignment using a terminals RX performance in an orthogonal frequency division multiple access (OFDMA) wireless regional area network (WRAN) system, including: a) measuring a bit energy/noise power spectral density (Eb/No) and a received signal strength indicator (RSSI) which are received in the terminal; b) informing the measured Eb/No and RSSI of a base station; c) calculating a round trip delay (RTD) in the base station; d) determining a terminal performance level based on the measured Eb/No, RSSI and the calculated RTD; and e) determining a frequency channel and modulation scheme based on the determined performance level.

Abstract: There is a provided a method for managing a multiple frequency assignment using a terminal's RX performance in an orthogonal frequency division multiple access (OFDMA) wireless regional area network (WRAN) system, including: a) measuring a bit energy/noise power spectral density (Eb/No) and a received signal strength indicator (RSSI) which are received in the terminal; b) informing the measured Eb/No and RSSI of a base station; c) calculating a round trip delay (RTD) in the base station; d) determining a terminal performance level based on the measured Eb/No, RSSI and the calculated RTD; and e) determining a frequency channel and modulation scheme based on the determined performance level.

Abstract: Provided are a transmission method and apparatus for allocating a subchannel and forming a stationary beam to maximize transmission efficiency in an OFDMA based wireless communication system. The method includes determining the subchannel for the equipment of each user based on the channel state of the equipment of each user, determining a beam index for the equipment of each user, based on location information and direction of arrival information of the equipment of each user, generating an OFDM symbol by mapping a modulation symbol corresponding to the equipment of each user to the determined subchannel, and transmitting the generated OFDM symbol to a wireless space by forming a beam following the determined beam index. Using the method, the equipment of each user can be allocated with an advantageous subchannel, can remove an interference signal at low cost, and can increase total throughput of an OFDMA system downlink.