Patent application number | Description | Published |
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 |
20090122754 | SYSTEM AND METHOD FOR ALLOCATING RESOURCES IN A COMMUNICATION SYSTEM - A method and system for allocating resources in a communication system are provided. The system includes a Base Station (BS) for allocating persistent resources included in a persistent resource area to one or more a Mobile Stations (MS) using the persistent resource area, for allocating an Identifier (ID) indicating an allocation order of the persistent resources to each of the one or more the MS using the persistent resource area, for transmitting resource allocation information including the ID and the number of slots included in the persistent resources to each of the one or more MSs using the persistent resource area, and for allocating dynamic resources to one or more MSs using a dynamic resource area, after the persistent resource allocation is completed for all of the one or more MSs using the persistent resource area. The persistent resource area includes successive persistent resources along a time axis and along a frequency axis. | 05-14-2009 |
20090135774 | APPARATUS AND METHOD FOR TRANSMITTING VOICE PACKET IN WIRELESS COMMUNICATION NETWORK - An apparatus and method for transmitting a voice packet in a wireless communication network are provided. The method includes generating voice data of a fixed length, which includes a voice packet having a length that is determined according to a rate of the voice packet, and a Forward Error Correction (FEC) code, and transmitting the generated voice data through a fixed resource. | 05-28-2009 |
20090147964 | APPARATUS AND METHOD FOR REMOVING AN ECHO SIGNAL IN A SIGNAL TRANSMISSION/RECEPTION APPARATUS OF A COMMUNICATION SYSTEM - A method and apparatus for removing an echo signal in a signal transmission/reception apparatus of a communication system are provided. A signal transmission/reception apparatus determines an echo channel impulse response using a reception signal, generates an echo signal removing coefficient using the echo channel impulse response, removes an echo signal from the reception signal using the echo signal removing coefficient, and transmits a signal in which the echo signal is removed. | 06-11-2009 |
20090149130 | APPARATUS AND METHOD FOR REMOVING AN ECHO SIGNAL IN A SIGANL TRANSMISSION/RECEPTION APPARATUS OF A COMMUNICATION SYSTEM - A method and apparatus for removing an echo signal in a signal transmission/reception apparatus of a communication system is provided. A signal transmission/reception apparatus estimates an input channel response using a training sequence, generates a first signal by removing the input channel response from a first reception signal, detects an echo channel impulse response using the first signal, detects an echo signal removing coefficient using the echo channel impulse response, generates a second signal in which an echo signal is removed by applying the echo signal removing coefficient to a second reception signal, and removes the second signal from a third signal, wherein the first signal is received prior to receiving the second signal and the second signal is received prior to receiving the third signal. | 06-11-2009 |
20090215390 | METHOD AND APPARATUS FOR ESTIMATING/REMOVING ECHO SIGNAL USING CHANNEL COEFFICIENT PREDICTING TECHNIQUE IN MULTI-CARRIER SYSTEM - A method and an apparatus are provided for estimating and removing interference of a signal at a wireless repeater operating in a multi-carrier system. In the method, a current echo channel linear prediction coefficient, which represents a coefficient between a current train signal section and a previous train signal section, is estimated using a current echo channel coefficient estimated in the current train signal section and a previous echo channel coefficient generated in the previous train signal section. A next echo channel coefficient is estimated using the current echo channel coefficient, the previous echo channel coefficient, and the current echo channel linear prediction coefficient. An echo channel coefficient outside a train signal section is estimated using the current echo channel coefficient and the next echo channel coefficient. | 08-27-2009 |
20100040010 | APPARATUS AND METHOD FOR TRANSMITTING AND RECEIVING INFORMATION THROUGH FAST FEEDBACK CHANNEL IN BROADBAND WIRELESS COMMUNICATION SYSTEM - An apparatus and method for transmitting and receiving information through a fast feedback channel in a broadband wireless communications system are provided. The apparatus includes a generator for generating a quasi-orthogonal signal stream corresponding to a codeword to be fed back, a plurality of mappers for mapping the quasi-orthogonal signal stream to a plurality of bundles in the fast feedback channel by using different mapping patterns, and a transmitter for transmitting the quasi-orthogonal signal stream mapped to the plurality of bundles. | 02-18-2010 |
20100056067 | APPARATUS AND METHOD FOR TRANSMITTING AND RECEIVING FAST FEEDBACK INFORMATION IN BROADBAND WIRELESS COMMUNICATION SYSTEM - An apparatus and method for operating a fast feedback channel in a broadband wireless communication system are provided. The method includes generating and transmitting a feedback signal through a fast feedback channel of a first mode, determining to switch a mode of the fast feedback channel from the first mode to a second mode, transmitting a signal for requesting the mode switching of the fast feedback channel through the fast feedback channel, and generating and transmitting a feedback signal through a fast feedback channel of the second mode. | 03-04-2010 |
20100189040 | APPARATUS AND METHOD FOR TRANSMITTING INFORMATION VIA UPLINK CONTROL CHANNEL IN OFDMA COMMUNICATION SYSTEM - An apparatus is capable of transmitting information via an uplink control channel in an Orthogonal Frequency Division Multiple Access (OFDMA) communication system. Uplink control information is encoded to obtain a predetermined bit string. A signal sequence corresponding to the predetermined bit string is generated. The signal sequence is cyclic-shifted according to a predetermined rule. The cyclic-shifted signal sequence is controlled according to a subframe length. Therefore, reception performance deterioration of an uplink control channel allocated to an irregular subframe can be minimized. | 07-29-2010 |
20100227638 | METHOD AND APPARATUS FOR POWER CONTROL IN A WIRELESS COMMUNICATION SYSTEM - A method and apparatus for power control in a wireless communication system are provided. A Mobile Station (MS) operation method for power control in a wireless communication system includes assigning an UpLink (UL) control channel to the MS from a Base Station (BS), determining a location to receive a Transmit Power Control (TPC) command based on the UL control channel, and receiving a TPC command in the determined location and increasing or decreasing transmit power, thus advantageously being capable of reducing an overhead for power control command assignment information. | 09-09-2010 |
20100331036 | UPLINK (UL) POWER CONTROL APPARATUS AND METHOD IN BROADBAND WIRELESS COMMUNICATION SYSTEM - An uplink (UL) power control apparatus and method in a broadband wireless communication system are provided. The Mobile Station (MS) includes a power controller for calculating a power compensation value using a last transmit power in a previous closed loop power control when a power control mode is changed to an open loop power control, and determining a transmit power according to the open loop power control using the power compensation value; and a transmitter for adjusting and transmitting the transmit power of a UL signal under control of the power controller. | 12-30-2010 |
20110173518 | APPARATUS AND METHOD FOR DETERMINING RELIABIILTY OF DECODED DATA IN COMMUNICATION SYSTEM - A method and apparatus for determining the reliability of decoded data in a communication system. The method includes calculating a total sum of absolute values corresponding to Log Likelihood Ratio (LLR) values of received data, generating a first value obtained by multiplying the total sum of the absolute values by a predetermined threshold value, performing iterative decoding with respect to the LLR values of the received data, generating a survived path metric value having a maximum value among all path metric values as a decoded result and generating decoded data, comparing the first value with the survived path metric value, and determining whether the decoded data has suitable reliability according to the compared result. | 07-14-2011 |
20110176645 | METHOD AND APPARATUS FOR ESTIMATING NOISE AND INTERFERENCE POWER IN WIRELESS TELECOMMUNICATIONS SYSTEM - A method and apparatus for estimating a noise and interference power in a wireless communication system are provided. Once a receiver receives an uplink signal from a terminal through an uplink channel to which semi-orthogonal sequences can be mapped, an estimator estimates an average power of signal components of the uplink signal and an average power of noise and interference components of the uplink signal by using correlation characteristics of the semi-orthogonal sequences, and a converter converts the average power of the signal components and the average power of the noise and interference components into a Carrier-to-Noise and Interference Ratio (CNIR). In this way, by simply and accurately estimating a CINR using semi-orthogonality of an uplink channel, stable and flexible system management becomes possible. | 07-21-2011 |
20110182346 | APPARATUS AND METHOD FOR ESTIMATING NOISE AND INTERFERENCE POWER IN COMMUNICATION SYSTEM - An apparatus and a method for estimating a Noise and Interference (NI) power in a communication system are provided. The method includes, calculating average values of impulse responses according to ranging codes, through use of a ranging signal sequence received through a resource allocated to a ranging channel, arranging the average values of the impulse responses according to ranging codes in order of the highest value to the lowest value, and multiplying a ranging code, which corresponds to an impulse response having an (x+1) | 07-28-2011 |
20120134438 | METHOD AND APPARATUS FOR DETECTING RECEIVED SIGNAL IN WIRELESS COMMUNICATION SYSTEM - A method for detecting a received signal by a Base Station (BS) in a communication system is provided. The method includes receiving a BandWidth Request (BW REQ) indicator, determining first interference signal streams representing BW REQ messages, determining whether the first interference signal streams include at least one second interference signal stream which is in a null state, determining a first Maximum Likelihood (ML) metric, determining a second ML metric for each of a case where a value of bits constituting each of third interference signal streams except for the at least one second interference signal stream among the first interference signal streams is 1, and calculating a minimum error distance of the BW REQ messages received from Mobile Stations (MSs) based on the first ML metrics and the second ML metrics. | 05-31-2012 |
20120218933 | METHOD AND APPARATUS FOR COMPENSATING FOR TIMING SYNCHRONIZATION ERROR IN A COMMUNICATION SYSTEM - A method for performing timing synchronization error compensation by a base station in a communication system, in which if there is a need for timing synchronization error compensation of a user equipment, the base station generates a message related to the timing synchronization error compensation, and broadcasts the generated message to the user equipment. In this manner, the base station can notify the user equipment of the need for timing synchronization error compensation in the communication system. | 08-30-2012 |
20130094469 | APPARATUS AND METHOD FOR TRANSMITTING AND RECEIVING INFORMATION THROUGH FAST FEEDBACK CHANNEL IN BROADBAND WIRELESS COMMUNICATION SYSTEM - An apparatus and method for transmitting information through a fast feedback channel in a wireless communications system are provided. The apparatus includes a plurality of mappers for mapping a sequence, corresponding to an index to be fed back, to a first set of resource blocks in a fast feedback channel by using a first mapping pattern and to a second set of resource blocks in the fast feedback channel by using a second mapping pattern, and a transmitter for transmitting the sequence mapped to a plurality of sets of resource blocks, wherein the sequence is mapped to each of the plurality of sets of resource blocks, and wherein each element of the sequence is mapped to each resource block. | 04-18-2013 |
20140286271 | APPARATUS AND METHOD FOR TRANSMITTING AND RECEIVING FAST FEEDBACK INFORMATION IN BROADBAND WIRELESS COMMUNICATION SYSTEM - An apparatus and method for operating a fast feedback channel in a broadband wireless communication system are provided. The method includes generating and transmitting a feedback signal through a fast feedback channel of a first mode, determining to switch a mode of the fast feedback channel from the first mode to a second mode, transmitting a signal for requesting the mode switching of the fast feedback channel through the fast feedback channel, and generating and transmitting a feedback signal through a fast feedback channel of the second mode. | 09-25-2014 |