Patent application number | Description | Published |
20100118917 | AUTOMATIC GAIN CONTROL APPARATUS AND METHOD USING EFFECTIVE RECEIVING STRUCTURE OF IMPULSE RADIO ULTRA-WIDE BAND WIRELESS COMMUNICATION SYSTEM - Provided are an automatic gain control (AGC) apparatus using an efficient receiving structure of an impulse signal-based ultra wideband wireless communication system, and a method thereof. An AGC apparatus of an impulse signal-based wireless communication system guarantees an SNR received through an analog circuit unit, outputs correlation values with respect to an impulse preamble of the received signal, outputs the maximum value of the correlation values for each symbol among the correlation values, or divides a symbol period into a plurality of groups and obtains average values through a sum of each group to output the maximum value thereof. | 05-13-2010 |
20100150219 | SAMPLING DEVICE AND METHOD IN WIRELESS COMMUNICATION SYSTEM - The exemplary embodiment of present invention provides a sampling device and method in a wireless communication system that is capable of precisely measuring a distance by combining data blocks passing through at least two delay paths and performing sampling thereon. | 06-17-2010 |
20100254486 | METHOD OF BLOCK-CODED GROUP MODULATION AND TRANSMITTER USING THE SAME - A transmitter using a method of block code-based group modulation includes a grouping unit, a generating unit, and a mapping unit. The grouping unit generates symbols by grouping a data bit stream into N-bit groups, and the generating unit generates a codeword set composed of codewords corresponding to combinations of arrangements of pulses that are generated by a result of grouping to a predetermined number. Next, the mapping unit block-maps a codeword selected from the codeword set to groups constituting the symbols. | 10-07-2010 |
20100265991 | RECEIVING APPARTUS, RECEIVING METHOD, PHASE TRACKING APPARATUS, AND PHASE TRACKING METHOD OF PULSE-BASED UWB WIRELESS SYSTEM - Provided are a receiving apparatus, a receiving method, a phase tracking apparatus, and a phase tracking method of a pulse-based UWB wireless system, which are capable of tracking and compensating phases of signals modulated with different modulation schemes in the same pulse-based UWB receiver system. The receiving apparatus of the UWB wireless system includes an orthogonal channel generating unit for receiving a baseband signal to generate orthogonal channels, a boundary detecting unit for receiving output signals of the orthogonal channel generating unit to detect boundaries of preamble, header and payload signals, a phase tracking unit for tracking and compensating phases of the preamble, header and payload signals output from the boundary detecting units, and a demodulating unit for demodulating output signals of the boundary detecting unit and the phase tracking unit to output data bits. | 10-21-2010 |
20110122969 | TRANSMISSION APPARATUS, RECEPTION APPARATUS, TRANSMISSION METHOD, AND RECEPTION METHOD OF WIRELESS COMMUNICATION SYSTEM - A transmission apparatus according to an exemplary embodiment of the present invention comprises a serial/parallel (S/P) converter for converting an input bit stream into a plurality of symbols each including 3 bits, a differential modulator for generating differential encoded symbols by applying π/4 phase rotation to each of the symbols, up-samplers for up-sampling the differential encoded symbols, filters for filtering the up-sampled symbols, digital/analog (D/A) converters for converting the filtered symbols into analog signals, and a quadrature modulator for performing quadrature modulation on the converted analog signals. | 05-26-2011 |
20110150124 | MODULATION APPARATUS, MODULATION METHOD, DEMODULATION APPARATUS, AND DEMODULATION METHOD - A modulation apparatus performs modulation in which a signal wave form is positioned at the front part of an entire symbol duration or the latter part of the entire symbol duration based on a first bit of the bit information to generate a modulation symbol including a silent signal duration in which there is no signal waveform. Particularly, the method delays a signal corresponding to a quadrature-phase signal axis by a predetermined time, thereby cancelling a phase difference between symbols. | 06-23-2011 |
20140169798 | HIGH SPEED DATA SERIAL CONNECTION INTERFACE APPARATUS, CPRI TRANSMITTING AND RECEIVING METHOD - A high speed data serial connection interface apparatus, CPRI transmitting and receiving methods thereof are disclosed. A high speed data serial connection interface apparatus according to the present invention includes: a data transmitter configured to count a continuous NCB of 0 or 1 in an input data block, select an LSI value, and perform up scaling on data in the block in accordance with the selected LSI value to transmit the data through an optical fiber in accordance with a CPRI (common public radio interface) protocol; and a data receiver configured to receive the data transmitted by the data transmitter, restore the LSI value from the received data, and perform down scaling on the received data in accordance with the restored LSI value to restore original data. | 06-19-2014 |
20150139357 | METHOD AND APPARATUS FOR TRANSMITTING OF OFDM SIGNAL - Provided is a transmitting apparatus including: a controller configured to determine a size of subchannels and a number of subchannels based on a size of entire channel band; and a DFT processor configured to spread a data symbol based on the number of the subchannels and the size of the subchannels. | 05-21-2015 |