摘要:
Disclosed is a method and an apparatus for self-calibrating a Direct Current (DC) offset and an imbalance between orthogonal signals, which may occur in a mobile transceiver. In the apparatus, a transmitter of a mobile terminal functions as a signal generator, and a receiver of the mobile terminal functions as a response characteristic detector. Further, a baseband processor applies test signals to the transmitter, receives the test signals returning from the receiver, and compensates the imbalance and DC offset for the transmitter side and the receiver side by using the test signals. The test signal is applied to only one of the I channel path and the Q channel path, and an RF band signal output from the transmission side by the test signal is used as an input signal to the reception side.
摘要:
A method is provided for self-calibrating the mismatch and the direct current (DC) offset occurring in a mobile transceiver. The transmitter of the mobile terminal is used as a signal generator and the receiver thereof is used as a response characteristic measurer. The baseband processor calibrates the mismatch and the DC offset for the receiving and transmitting sides using a test signal received from the transmitter. When multiple input subcarriers are used in a mixer present on a reception stage, self-calibration is performed using multiple received test signals obtained from one transmission test signal.
摘要:
A method is provided for self-calibrating the mismatch and the direct current (DC) offset occurring in a mobile transceiver. The transmitter of the mobile terminal is used as a signal generator and the receiver thereof is used as a response characteristic measurer. The baseband processor calibrates the mismatch and the DC offset for the receiving and transmitting sides using a test signal received from the transmitter. When multiple input subcarriers are used in a mixer present on a reception stage, self-calibration is performed using multiple received test signals obtained from one transmission test signal.
摘要:
A method of manufacturing a nanofiber web using an electrospinning method is disclosed. The method comprises the steps of: supplying a polymer solution to the surface of a metal roller 10 with a direct current high voltage applied thereto; spinning the polymer solution supplied to the surface of the metal roller 10 toward a collector 40 of a metal plate with a direct current high voltage applied thereto having a different charge from that of the metal roller 10 to volatilize nanofibers, wherein the collector of the metal plate is located on the horizontal surface of the metal roller 10; and coating the volatilized nanofibers 70 on the collector 40. This method can improve the uniformity of the web, make the management of a production process easier, freely change type of web to be produced, make the maintenance and repair of facilities convenient, and simplify the facilities.
摘要:
A device and method for rate matching channel-encoded symbols in a data communication system. The rate matching device and method can be applied to a data communication system which uses one or both of a non-systematic code (such as a convolutional code or a linear block code) and a systematic code (such as a turbo code). In one aspect, the rate matching device includes a plurality of rate matching blocks, the number of the rate matching blocks being equal to a reciprocal of a coding rate of a channel encoder. The rate matching device can rate match the symbols encoded with a non-systematic code or the symbols encoded with a systematic code, by changing initial parameters including the number of input symbols, the number of output symbols, and the puncturing or repetition pattern determining parameters.
摘要:
A puncturing device for a turbo encoder in a mobile communication system having a turbo encoder which turbo encodes input source data into a plurality of information frames and tail symbols at a given code rate is disclosed. The puncturing device comprises a frame generator for generating a transmission frame by performing puncturing and adding invalid symbols; and a controller for performing puncturing on the information frames according to the code rate, puncturing the tail symbols only when the number of punctured information frames and tail symbols exceeds a bit number according to a symbol rate, and otherwise, controlling the frame generator by reading a puncturing pattern according to the code rate and information about the number of invalid symbols.
摘要:
An iterative decoder and iterative decoding method. In the iterative decoder, a first adder has a first port for receiving information symbols and a second port. A first component decoder which is coupled to the first adder, receives first parity symbols and decodes the information symbols using first parity symbols and an output signal of the first adder. A first subtractor has a third port for receiving the output of the first component decoder, and a fourth port. An interleaver which is coupled to the output of the first subtractor, interleaves the decoded information symbols received from the first component decoder. A second component decoder receives the output of the interleaver and second parity symbols and decodes the information symbols of the interleaver output using the received signals. A deinterleaver deinterleaves the output of the second component decoder. A second subtractor has a fifth port for receiving the output of the deinterleaver and a sixth port for receiving an inverted output of the first subtractor. The output of the second subtractor is connected to the second port and an inverted output of the second subtractor is connected to the fourth port. A hard decision device converts the decoded symbols received from the first component decoder to binary information bits. An error detector checks errors in the binary information bits received from the hard decision device and generates a no error signal if no errors are detected. An output buffer stores the binary information bits received from the hard decision device and outputs the stored binary information bits in response to the no error signal.
摘要:
A 2-dimensional interleaving method is disclosed. The method comprises dividing a frame of input information bits into a plurality of groups and sequentially storing the divided groups in a memory; permuting the information bits of the groups according to a given rule and shifting an information bit existing at the last position of the last group to a position preceding the last position; and selecting the groups according to a predetermined order, and selecting one of the information bits in the selected group.
摘要:
Disclosed is a method for predicting a phase pattern using a magnitude pattern in near-field or Fresnel field formed by antenna radiation, including: determining a first parameter group including a first actual distance between a source antenna and a probe and the magnitude pattern at the first distance; assuming a second parameter group including a second distance that is an effective distance between the source antenna and the probe, a current magnitude distribution of the source antenna and a current phase distribution of the source antenna, based on the first parameter group; calculating the magnitude pattern at the first distance based on the second parameter group; and determining the phase pattern at the first distance when the magnitude pattern at the calculated first distance matches with the magnitude pattern at the first distance included in the first parameter group by the comparison therebetween.
摘要:
A device and method for rate matching channel-encoded bits in a data communication system. The rate matching device includes a plurality of rate matching blocks, the number of the rate matching blocks being equal to a reciprocal of a coding rate of a channel encoder. The rate matching device can rate match the bits encoded with a non-systematic code or the bits encoded with a systematic code, by changing initial parameters including the number of input bits, the number of output bits, and the puncturing or repetition pattern determining parameters.