Abstract: A method for rate control in a wireless communication system includes feedback information indicating whether a packet is received, is received from a receiver. A channel state value measured by the receiver is received. It is determined whether the same feedback information is received from the receiver successively more than a predetermined frequency. A target error rate is controlled if the same feedback information is received successively more than the predetermined frequency.

Abstract: A mobile communication system is provided. A base station includes: a measuring unit for measuring loads of all mobile stations existing within a sector; a first computation unit for computing a sector load by using a Rise Over Thermal (ROT) of the sector; a second computation unit for computing an interference factor, which is a ratio of an interference load caused by an adjacent sector to a corresponding sector load, by using the load of each mobile station and the sector load; and a determining unit for predicting a sector load depending on variation of a reverse data transfer rate of a target mobile station by using the interference factor and for determining the reverse data transfer rate of the target mobile station in a range where the predicted sector load does not exceed a sector threshold load.

Abstract: An apparatus and method for eliminating interference in a base station (BS) of a communication system. A first BS receives a first reception signal from a first mobile station located in a cell of the first base station. A second base station being adjacent to the first base station delivers decoding information of a second reception signal to the first base station, the second reception signal received from a second mobile station located in a cell of the second base station. The first BS determines whether an error exists on the second reception signal, based on the decoding information and re-generates an interference signal using the decoding information of the second reception signal when no error exists in the second reception signal, and performing interference elimination on the first reception signal using the re-generated interference signal.

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 and method for receiving data in a mobile station for a mobile communication system using multi-user packet data are provided, in which a preamble power measurer measures preamble power of the multi-user packet data received from a base station and transmits the result value to a controller. The controller compares the measured power with a predetermined threshold, simultaneously decodes the multi-user packet data according to all transport formats if the measured power is lower than the threshold, and decodes the multi-user packet data according to a predetermined transport format if the measured power is higher than or equal to the threshold. A plurality of decoders decode the received multi-user packet data according to a control signal from the controller, wherein the number of the decoders depends upon the total number of transport formats for the multi-user packet data.

Abstract: An apparatus and method for rate control in a wireless communication system are provided. The apparatus includes a preprocessor, a rate controller, a determiner, and a transmitter. The preprocessor determines feedback information on a physical layer packet using a feedback message of MAC ARQ. The rate controller updates a CQI reported from a receiver using the determined feedback information. The determiner determines an MCS using the updated CQI. The transmitter transmits data using the determined MCS.

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 a method for detecting traffic channel signal transmission in a rake receiver may advantageously ensure stable and accurate detection performance in performing continuous/discontinuous transmission detection of traffic channels with a rake receiver in a mobile communication system based upon CDMA 2000 standards by making sufficiently spaced distribution in traffic channel signal-to-noise ratios estimated in continuous/discontinuous transmission. The method includes compensating traffic channel signals according to fingers, respectively, by using estimated pilot channel signals; combining the compensated finger-based traffic channel signals and estimating signal-to-noise ratios for traffic channels; and comparing the estimated signal-to-noise ratios with a preset threshold value, respectively, to detect continuous or discontinuous transmission of the traffic channels based upon comparison results.

Abstract: An apparatus and method for controlling power in a wireless mobile communication system are provided. The apparatus and method efficiently adjusts a threshold value in order to control closed-loop power through an outer-loop power control in a wireless mobile communication system. Accordingly, it is possible to increase cell capacity while link performance is stably maintained.

Abstract: An uplink power control method of a base station (BS) in a m obile communication system is provided. The method includes rece iving a signal from a terminal; calculating an RSQI value using t he signal and previous power control information; comparing the R SQI with a threshold; determining power control information after the comparison; sending the power control information to the ter minal.

Abstract: An apparatus and method for power allocation in a mobile communication system are provided. A transmitting method includes allocating a certain fraction of total power to a common control channel; allocating available power corresponding to the remaining fraction of the total power to remaining control channels except for the common control channel among control channels transmitted in a current time slot by considering the remaining control channels; calculating a gain value of each control channel according to power allocated to each control channel; and regulating a gain of each control channel, which is to be transmitted to one or more Access Terminals (ATs), according to the calculated gain value. Therefore, reception throughput of each control channel can be improved.

Abstract: A cyclic delay diversity (CDD) technique in a multiple-antenna broadband wireless communication system is provided. An apparatus in the multiple-antenna broadband wireless communication system includes: a controller for selecting at least one sub-carrier to which CDD is applied; at least one shifter for shifting a phase of a signal mapped to the at least one selected sub-carrier; and an operator for converting the signal, which is mapped to the at least one selected sub-carrier and whose phase is shifted, and other signals mapped to the remaining sub-carriers into time-domain signals.

Abstract: A method for determining a scaling factor in a communication system. The method includes calculating an average power for each of an input signal and an output signal of a channel predictor; calculating a noise variance using the calculated average power; normalizing the noise variance with an average power of the channel predictor's output signal; and determining a scaling factor using the normalized noise variance.

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: A Multiple Input Multiple Output (MIMO) wireless communication system is provided. A receiving end apparatus includes an estimator for estimating a channel between a plurality of Transmit (Tx) antennas of a transmitting end and a plurality of Receive (Rx) antennas of a receiving end; a filter for extracting a sum between interference and noise included in an Rx signal by using the estimated channel value and for computing a covariance matrix for the sum between the interference and the noise; and a detector for detecting a Tx signal by using a signal processing matrix generated from the covariance matrix.

Abstract: A method and apparatus for scheduling downlink packets in a mobile communication system are provided, in which a BS prioritizes MSs, while accounting for types of services provided to the MSs, generates one single-user candidate transmission format and M multi-user candidate transmission formats corresponding to a DRC value received from an MS with a highest priority level, estimates per-slot effective data rates for the single-user candidate transmission format and all of the multi-user candidate transmission formats, and transmits a downlink packet in a candidate transmission format having a maximum per-slot effective data rate.

Abstract: Provided is an apparatus and method for compensating a timing offset in a broadband wireless communication system. A receiving apparatus for the timing offset compensation includes a selector, a first calculator, and a second calculator. The selector groups two or more adjacent tiles into one or more tile groups and selects one or more pilot pairs, each including adjacent pilot signals, from each tile group. The first calculator calculates an average phase difference between the pilot pairs. The second calculator calculates a timing offset using the average phase difference.

Abstract: An apparatus and method for accurately measuring the thermal noise power of a silence period and increasing the control efficiency of reverse link load in a mobile communication system. In the received power measuring apparatus, a UPMB measures the received power of the reverse link, accumulates the measured received power, and outputs the accumulated received power as a received power value. A remover compensates the received power value using a time constant if the received power value is for a silence period. A controller provides a silence period signal to the remover when the silence period starts.

Abstract: A mobile communication system is provided. A base station includes: a measuring unit for measuring loads of all mobile stations existing within a sector; a first computation unit for computing a sector load by using a Rise Over Thermal (ROT) of the sector; a second computation unit for computing an interference factor, which is a ratio of an interference load caused by an adjacent sector to a corresponding sector load, by using the load of each mobile station and the sector load; and a determining unit for predicting a sector load depending on variation of a reverse data transfer rate of a target mobile station by using the interference factor and for determining the reverse data transfer rate of the target mobile station in a range where the predicted sector load does not exceed a sector threshold load.