Patent application number | Description | Published |
20080240308 | APPARATUS AND METHOD FOR ESTIMATING CHANNEL USING SLIDING WINDOWS IN A BROADBAND WIRELESS COMMUNICATION SYSTEM - 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. | 10-02-2008 |
20090074047 | APPARATUS AND METHOD FOR ESTIMATING SIGNAL TO INTERFERENCE AND NOISE RATIO IN A WIRELESS COMMUNICATION SYSTEM - 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. | 03-19-2009 |
20090103446 | APPARATUS AND METHOD FOR ESTIMATING NOISE AND INTERFERENCE ON RANGING CHANNEL IN A BROADBAND WIRELESS COMMUNICATION SYSTEM - 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. | 04-23-2009 |
20090154399 | APPARATUS AND METHOD FOR DETECTING A RANGING SIGNAL IN A WIRELESS COMMUNICATION SYSTEM - 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. | 06-18-2009 |
20090191818 | APPARATUS AND METHOD FOR ESTIMATING NOISE AND INTERFERENCE POWER IN A COMMUNICATION SYSTEM - 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. | 07-30-2009 |
20090221282 | APPARATUS AND METHOD FOR MEASURING CHANNEL QUALITY BY USING RANGING SIGNAL IN BROADBAND WIRELESS COMMUNICATION SYSTEM - 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. | 09-03-2009 |
20100220617 | Apparatus and method for detecting channel quality indicator information in wireless communication system - 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. | 09-02-2010 |
20110141935 | METHOD AND APPARATUS FOR RECEIVING MINIMUM MEAN-SQUARED-ERROR IN SINGLE-CARRIER FREQUENCY DIVISION MULTIPLE ACCESS SYSTEM - A method and an apparatus for receiving a Minimum Mean-Squared-Error (MMSE) in a Single-Carrier Frequency Division Multiple Access (SC-FDMA) system is provided. The method includes, transforming a signal in a time domain received through an antenna into a signal in a frequency domain, and discriminating between bands respectively allocated to terminals in a frequency domain, estimating a channel and computing a weight value from the signal transformed into the frequency domain, and detecting an MMSE, computing a time-domain bias from the weight value and a channel estimation value of the signal transformed into the frequency domain, normalizing the detected MMSE by using the computed time-domain bias, and transforming the normalized signal into a normalized signal in a time domain, decoding the normalized signal transformed to the time domain, and transmitting the decoded normalized signal transformed into the time domain to each of the terminals. | 06-16-2011 |
20110158343 | METHOD AND APPARATUS FOR ESTIMATING CHANNEL USING PHASE COMPENSATION IN WIRELESS COMMUNICATION SYSTEM - Method of estimating a channel in a wireless communication system by obtaining a channel impulse response from a pilot signal included in a received signal; estimating a timing offset with a maximum peak power value for the channel impulse response; and performing a phase compensation using the estimated timing offset and estimating a channel which is applied with the compensated phase. | 06-30-2011 |
20120203812 | METHOD AND APPARATUS FOR GENERATING SIGNAL HAVING CONVERTED SAMPLING RATE IN COMMUNICATION SYSTEM - A method of generating a signal having a converted sampling rate in a communication system is provided. The method includes selecting effective input samples among S number of input samples included in an input stream corresponding to an input sampling rate, generating a filter coefficient set including filter coefficients having a length of a second tap, the filter coefficients having the length of the second tap being generated by dividing a filter coefficient having a length of a first tap configuring a low-pass filter into the filter coefficients having the length of the second tap corresponding to a number of selected effective input samples, selecting filter coefficients corresponding to each of the effective input samples among the filter coefficients included in the filter coefficient set, and outputting output samples having an output sampling rate which is converted from the input sampling rate. | 08-09-2012 |