Abstract: An apparatus and method for determining feedback information detection in a broadband wireless communication system are provided. In the detection determining apparatus, a demodulator correlates each of tiles carrying received feedback information with an orthogonal vector including a pilot symbol in each possible codeword, each tile being a predetermined number of subcarriers, and calculates the squares of the absolute values of the correlations. A codeword correlation calculator sums the squares of the absolute value of the correlations of the tiles for each possible codeword. A detection decider determines whether to perform detection on the feedback information based on the maximum of the sums.

Abstract: Disclosed is a method for receiving a signal by a receiver in a communication system, the method includes receiving a signal; estimating a first noise value by using a reference signal included in the received signal; estimating a second noise value by using at least one subcarrier which has been unused for a transmission of data and the reference signal; and when a difference between the estimated first noise value and the estimated second noise value is greater than a threshold value, demodulating the data by using an interference removal algorithm.

Abstract: An apparatus and a method for a base station or a sector to efficiently detect Channel Quality Indicator (CQI) information transmitted from a terminal in a wireless communication system are provided. A method of a base station for detecting CQI information in a wireless communication system includes determining a part or all of a CQI interval as a correlation interval based at least partly upon a presence of an interference power less than a threshold in a corresponding interval of the CQI interval; and determining correlations between a signal received over the determined correlation interval and possible codewords.

Abstract: An apparatus and method for estimating the CINR of an uplink channel in a broadband wireless communication system are provided, in which tiles being subcarrier sets are separated from a feedback signal received on the uplink channel. All symbols included in the tiles of the feedback signal are correlated with each of codewords, the absolute values of the correlations are squared for the each codeword and summed, a codeword with a maximum sum from among the codewords is selected. Received power level and noise power level are calculated using all the symbols included in the tiles of the feedback signal correlated with the codeword with the maximum sum, and the CINR of the uplink channel is estimated using the received power and the noise power levels.

Abstract: A method for measuring channel quality of a Base Station (BS) by using a ranging signal in a broadband wireless communication system is provided. The method includes estimating a time offset of the ranging signal received through a ranging channel, measuring channel quality by using the ranging signal including the time offset, determining whether distortion occurs in the measured channel quality by using the time offset, and compensating for distortion of the measured channel quality.

Abstract: A method is provided for estimating a Noise and Interference (NI) power in a ranging code reception apparatus in a communication system. The method includes generating S correlation values by calculating correlations between L ranging subcarriers received at a ranging code reception apparatus and L elements included in each of S ranging codes available in the ranging code reception apparatus, detecting N reception-desired ranging codes that the ranging code reception apparatus desires to receive, among the S ranging codes, using the S correlation values, and selecting M remaining ranging codes among (S-N) ranging codes obtained by removing the N reception-desired ranging codes from the S ranging codes, and estimating a first NI power using correlation values for the M remaining ranging codes.

Abstract: An apparatus for a base station of a wireless communication network includes a detector to detect an access code received from a mobile station in each of a plurality of time durations and to detect a timing offset of the access code detected in each of the plurality of time durations, an estimator to estimate a carrier-to-interference noise ratio (CINR) during each of the plurality of time durations, and a determining unit to determine a timing offset correction value to be applied to subsequent signals from the mobile station using the CINR, the timing offset, and the access code detected in each of the plurality of time durations.

Abstract: An apparatus and a method for estimating a noise/interference power value of a ranging channel in a broadband wireless communication system are provided. An apparatus for a base station in a broadband wireless communication system includes an operator, an estimator, and an adder/subtractor. The operator calculates the receive (RX) power of a ranging subcarrier signal received through ranging subcarriers. The estimator estimates the signal power of a detected ranging signal. The adder/subtractor calculates the noise/interference power of a ranging channel by subtracting the signal power of the detected ranging signal from the RX power of the ranging subcarrier signal.

Abstract: An apparatus and method for estimating a Signal to Interference plus Noise Ratio (SINR) in a wireless communication system are provided. The method includes processing a received signal by Orthogonal Frequency Division Multiplexing (OFDM) demodulation to convert the received signal into frequency-domain data, selecting ranging data from the frequency-domain data, multiplying the selected ranging data by a ranging code to perform code demodulation, calculating at least one norm value and at least one coherent norm value by bundle for the code-demodulated data and estimating an SINR using the calculated at least one norm value and at least one coherent norm value.

Abstract: An apparatus and a method for estimating a channel using sliding windows in a broadband wireless communication system are provided. The apparatus includes an estimator, a first calculator, a second calculator, and a third calculator. The estimator estimates a speed of travel. The first calculator calculates a time correlation values using the estimated speed. The second calculator calculates weight factors using the time correlation values. The third calculator calculates a channel estimation value by multiplying corresponding pilot symbols by the weight factors and equalizing the pilot symbols.

Abstract: Provided is an outer loop power control apparatus and method for a signal transmitter in a communication system. The outer loop power control method includes determining a first setpoint of a kth frame according to whether or not an error occurs in a (k?1)th frame, updating a second setpoint of the kth frame with the first setpoint of the kth frame if a difference value between the first setpoint of the kth frame and a second setpoint of the (k?1)th frame is greater than a first reference value, and transmitting a transmit power control message to a signal receiver at the kth frame if the difference value between first setpoint of the kth frame and the second setpoint of the (k?1)th frame is greater than a second reference value.

Abstract: Disclosed is a method for receiving a signal by a receiver in a communication system, the method includes receiving a signal; estimating a first noise value by using a reference signal included in the received signal; estimating a second noise value by using at least one subcarrier which has been unused for a transmission of data and the reference signal; and when a difference between the estimated first noise value and the estimated second noise value is greater than a threshold value, demodulating the data by using an interference removal algorithm.

Abstract: An apparatus and a method for estimating a Carrier to Interference and Noise Ratio (CINR) of an uplink channel in a wireless communication system are provided. The apparatus includes a subcarrier separator for separating subcarrier bundles from a received signal, a detector for calculating squares of correlation values acquired by correlating one or more codewords with signal streams of the separated subcarrier bundles, and a CINR estimator for estimating a CINR using a maximum value and an average value of the correlation value squares calculated at the detector. With the accurate CINR estimated, the channel information delivery and the stable system operation can be achieved.

Abstract: An apparatus and method for receiving data in a communication system are provided. The method includes identifying first codewords, which have been used in transmission of data by a transmitter, in the data received from the transmitter, setting third codewords by adding second codewords to the identified first codewords, calculating correlation values of orthogonal vectors corresponding to the third codewords and detecting information included in the data based on the calculated correlation values. Accordingly, feedback information may be better received and detected.

Abstract: An apparatus and method for estimating the CINR of an uplink channel in a broadband wireless communication system are provided, in which tiles being subcarrier sets are separated from a feedback signal received on the uplink channel. All symbols included in the tiles of the feedback signal are correlated with each of codewords, the absolute values of the correlations are squared for the each codeword and summed, a codeword with a maximum sum from among the codewords is selected. Received power level and noise power level are calculated using all the symbols included in the tiles of the feedback signal correlated with the codeword with the maximum sum, and the CINR of the uplink channel is estimated using the received power and the noise power levels.

Abstract: An apparatus and method for determining feedback information detection in a broadband wireless communication system are provided. In the detection determining apparatus, a demodulator correlates each of tiles carrying received feedback information with an orthogonal vector including a pilot symbol in each possible codeword, each tile being a predetermined number of subcarriers, and calculates the squares of the absolute values of the correlations. A codeword correlation calculator sums the squares of the absolute value of the correlations of the tiles for each possible codeword. A detection decider determines whether to perform detection on the feedback information based on the maximum of the sums.

Abstract: An apparatus and method for detecting a feedback signal in a multi-cell or multi-sector sector BS in a broadband wireless communication system are provided. A demodulator correlates each tile being sets of subcarriers carrying feedback information received from a serving sector/cell with each possible codeword and calculates the squares of the absolute values of the correlations of the tiles for each possible codeword. A first detection decider sums the squares for each possible codeword and determines whether to perform detection on the received feedback information. If it is impossible to detect the feedback information, a second detection decider receives feedback information from a target sector/cell, combines the feedback information received from the serving sector/cell and the target sector/cell, and determines whether to detect the combined feedback information.

Abstract: An apparatus and method are provided for managing sectors in a transmission operation of a base station including a smart antenna system forming directional beams using a plurality of antenna elements. The apparatus and method comprise determining whether a call connected to a mobile station is a voice call or a data call; multiplying a transmission signal to the mobile station by predetermined complex weight vectors selected according to the call type; and forming a transmission beam for a corresponding sector by summing the multiplied values according to the antenna elements.

Abstract: Disclosed is a base station device and method for supporting communication service for a mobile station which is located in a cell divided into a plurality of sectors. The device and method comprise a receiver for receiving a signal, which is transmitted from the mobile station, through multiple paths via the plurality of sectors, and demodulating and outputting the received signal; and a combiner for combining and outputting signals output from the receiver.

Abstract: Disclosed is a microwave oven comprising, a body divided into a cooking chamber and a device chamber, a magnetron installed in the device chamber of the body, a high voltage condenser and a high voltage transformer, and a blower for cooling elements installed in the device chamber. The blower comprises a fan for forcedly blowing air, and a motor having a stator, a rotor, and at least one fixing rod. The stator is equipped with a bobbin with a coil wound thereon. The stator provides the fan with a driving force. The fixing rod is extended from the stator and coupled with a rear panel of the body. The fixing rod passes through the rear panel, and is formed with a screw part at an end part thereof which is assembled with a nut. The blower for cooling the devices for generating microwave is directly fixed onto the rear panel of the body without using a bracket. Accordingly, unit cost is reduced due to a reduced amount of elements.