摘要:
A transmitting apparatus and receiving apparatus of a multi-carrier system using multiple antennas is proposed. A linear complex field (LCF) encoder performs linear precoding of input signals to be transmitted using a linear complex matrix based on the number of antennas and the number of subcarriers, and a subcarrier allocator allocates a subcarrier to each precoded signal. A transmitter transmits the signals through the multiple antennas. In a receiving apparatus, a subcarrier de-allocator extracts a linear-precoded signal by de-allocating a subcarrier of the received signal, and an LCF decoder outputs a bit reliability of the received signal based on the number m of antennas and the number n of subcarriers. Performance may be improved by using space diversity using multiple antennas and frequency diversity using OFDMA, and system complexity may be reduced by using a lattice reduction and a 2-branch Chase decoder.
摘要:
Disclosed is a decoding method and device for low density parity check codes using dynamic scheduling. The low density parity check codes are sequentially decoded, and the messages are scheduled in the descending order of the difference between values before and after updating the message transmitted from the variable node to the check node.
摘要:
A mobile terminal and controlling method thereof are disclosed, by which a message can be sent in a manner that necessary information is contained in the message according to a configuration of the mobile terminal, a data volume of the message, a recipient of the message and/or the like.The present invention includes a wireless communication unit configured to send a message stipulated to limit a data space to which data can be inputted by a user, a display unit configured to display the message, a memory configured to store at least two user informations previously set, a user input unit configured to input the message, and a control unit controlling one of the at least two user informations to be selected according to a size of an empty space of the data space in sending the message after completion of writing the message, the control unit controlling the selected user information to be sent by being contained in the data space of the message.
摘要:
A protrudable connector structure that includes a first frame having a first guiding hole; a second frame having a push button and a second guiding hole that overlaps with the first guiding hole when the push button is pressed; a pin inserted into the first guiding hole and the second guiding hole so that the pin moves along the first and second guiding holes; a connector member coupled to the pin; and a link that presses the pin, wherein when the pin is located in a first locking groove portion of the second guiding hole, the connector member is locked so as not to protrude outside of the housing, and when the pin is located in a second locking groove portion of the second guiding hole, the connector member is locked so as not to be inserted into the housing.
摘要:
An apparatus and method for deciding an adaptive noise level for bandwidth extension are provided. The apparatus includes a noise level decider for deciding a high-band noise level for bandwidth extension according to tonality of an input signal, a pitch frequency analyzer for detecting a pitch frequency of the input signal and analyzing correlation between the detected pitch frequency and a frequency channel, and a noise level controller for adaptively controlling the decided high-band noise level based on the analyzed correlation of the pitch frequency and the frequency channel.
摘要:
The present invention relates to a multiple antenna transmission system and a signal transmission method In the signal transmission method using multiple antennas, a plurality of subcarrier symbols are grouped as a plurality of groups including first and second tiles that are basic resource management units including two or more subcarriers included in a set frequency domain, phases of subcarrier symbols included in a first tile are shifted to be a first phase shifting value, and phases of subcarrier symbols included in a second tile are shifted to be a second phase shifting value that is different from the first phase shifting value.
摘要:
Provided are an apparatus for multi-stage transforming a plurality of unit blocks in multi-dimension that can improve compression efficiency of video data by collecting Discrete Cosine Transforming (DCT) coefficients of neighboring blocks and performing an additional transformation based on the DCT coefficients of an original picture and a differential picture. The method includes the steps of: performing a Discrete Cosine Transform (DCT) on inputted picture data and selecting R blocks of a predetermined size from DCT picture data, where R is a natural number equal to or greater than 2; arranging DCT coefficients of each of the selected R blocks according to each frequency in one-dimension; and performing one-dimensional transformation again on the DCT coefficients arranged in one-dimension.
摘要:
A space domain filter detecting method in a multi-antennas wireless communication system, processing differently with the interference from the time domain and the space domain, which proceeds the interference elimination in matched filter manner for the interference signals from all antennas in the other time, and proceeds the filtering in corresponding manner for the interference signals from the other antennas in present time, comprises the following steps: firstly, the received signals are matched-combined in time domain and space domain; secondly, with the combined signals as the observation value for detecting, the filtering is proceeded in space domain in corresponding manner; thirdly, the estimated value is subtracted from the filtered signals, and the result is taken as the detecting result to output, and then is sent to the determiner in non-error control coding system to get the symbol hard determination output or is sent to the determiner in error control coding system to get the symbol soft determination output that finally sent to the coder. The method promotes the transmission rate and the anti-interference ability and advances the spectrum efficiency.
摘要:
A method of receiving an orthogonal frequency division multiplexing (OFDM) signal. The method includes receiving sample signals from the OFDM signal, providing reference sample signals, calculating a first value representing a first correlation between the sample signals and different sample signals, calculating a second value representing a second correlation between the reference sample signals and different reference sample signals, the reference sample signals and the different reference sample signals corresponding to the sample signals and the different sample signals, calculating a third value from the first value and the second value, and detecting the OFDM signal in response to the third value.
摘要:
A device and method for estimating a carrier to interference-plus-noise ratio (CINR) in an OFDM system are provided. The CINR estimating method includes (a) receiving a preamble symbol and transmit subcarrier transmitted from a base station; (b) calculating an interference power and noise power using the preamble symbol and transmit subcarrier; (c) calculating a receive power used for the base station to transmit a preamble and data symbol; (d) estimating a preamble CINR value using an interference power, a noise power, and a receive power; (e) calculating the noise power from a subcarrier not transmitting a preamble; and (f) calculating an average CINR of data subcarriers using the preamble CINR value and the noise power. With such a method, a precise carrier to interference-plus-noise ratio (CINR) can be estimated using a preamble when the preamble power is amplified in comparison with the data symbol power, the subcarriers are differently applied for the respective cells, and the traffic of the data area is partially loading.