摘要:
Provided is an apparatus and method for analyzing identification (ID) signals by converting radio frequency (RF) signals which are transmitted with an ID signal added thereto by a transmitting part, e.g., a plurality of transmitters or repeaters, into signals of a desired band; creating ID signals that are identical to the ID signals added to the RF signals; calculating correlation values between the converted signals and the created ID signals based on partial correlation; and extracting channel profile of multi-path signals caused by a channel between the transmitting part and the ID signal analyzing apparatus from the correlation value. The technology of the present research is applied to broadcasting and communication.
摘要:
An apparatus for transmitting and receiving broadcasting-communication data, the apparatus including an original signal generator configured to receive the original data and generate baseband original signals, a first modulator configured to receive the baseband additional signals and generate original signals of a predetermined band, an additional signal generator configured to receive the additional data and generate baseband additional signals, a second modulator configured to receive the baseband additional signals and generate additional signals of a predetermined band, an average power controller configured to control an average power of the additional signals of the predetermined band, an inserter configured to insert the additional signals of the predetermined band with a controlled average power to the original signals of the predetermined band to thereby generate mixed signals of a predetermined band, and a transmitter configured to transmit the mixed signals of the predetermined band.
摘要:
Disclosed are a method and an apparatus for transmitting and receiving broadcast data in a digital broadcasting system. The method for transmitting and receiving broadcast data in a digital broadcasting system includes receiving the main data encoded with symbols having a plurality of levels; deciding whether levels of main data symbols encoded with symbols having the plurality of levels belong to a first group; and mapping the main data symbols to extended levels by using modulation values of the additional data if it is decided that the levels of the main data symbols belong to the first group.
摘要:
An apparatus for transmitting data in a communication system includes: a first repeater configured to repeat information bits of data to be transmitted a first repetition number of times; an interleaver configured to interleave the information bits repeated the first repetition number of times; an accumulator configured to accumulate-code the interleaved information bits; a second repeater configured to repeat the accumulate-coded information bits a second repetition number of times; a puncturer configured to puncture the information bits repeated the second repetition number of times; and a P/S converter configured to convert the punctured information bits and the information bits of the data and output RA-coded information bits.
摘要:
In the present invention, deciding M final soft decision bit values includes a first step of securing an I channel value and a Q channel value of the received transmission signal, a second step of securing initial soft decision bit values for a first bit and a second bit by using the secured I channel value and the secured Q channel value, a third step of cyclically securing initial soft decision bit values for a third bit to an Mth bit by using the initial soft decision bit values for the first bit and the second bit, and a fourth step of securing final soft decision bit values by multiplying the secured initial soft decision bit values by a gain, wherein the gain is calculated based on a reliability adjustment value of the initial soft decision bit values.
摘要:
Provided are a distributed repeater for repeating output signals identical to input signals through a channel different from that of main transmitter signals but identical to channels of other distributed repeaters, and a distributed repeating method thereof. The distributed repeater includes: a pre-processing unit configured to receive a radio frequency (RF) signal transmitted from an external device and demodulate the RF signal into a baseband signal; an equalizer configured to equalize the baseband signal to correct a distortion occurring on a transmission channel; an identification signal generation and insertion unit configured to generate an identification signal for identification of the distributed repeater and network conditioning, and insert the identification signal in the equalized baseband signal; and a post-processing unit configured to convert the baseband signal from the identification signal generation and insertion unit into an RF signal, and send the RF signal.
摘要:
An apparatus and method for calculating a correlation value using a first channel impulse response estimated from a received signal, determining a weight value based on the correlation value, applying the weight value to the first channel impulse response, and estimating a second channel impulse response is provided.
摘要:
Provided is an apparatus and method for estimating inverse channel of a repeater's receiving channel, which ensures stability and causality by generating a time-domain filter coefficient having information on an inverse channel of repeater's receiving channel from a signal transmitted from a main transmitter or another repeater. The apparatus includes: a channel estimator for estimating a channel established by a transmission path from a received signal; an inverse minimum phase filter coefficient generator for generating inverse channel of a minimum phase channel from the estimated channel, and converting the inverse channel of the minimum phase channel into a time-domain filter coefficient; an inverse group delay filter coefficient generator for generating a time-domain filter coefficient by using the estimated channel and the minimum phase channel; and a combiner for generating an inverse channel of a receiving channel in a time domain by combining the filter coefficient and the filter coefficient.
摘要:
Provided are an on-channel repeater for repeating an output signal the same as an input signal on channel by removing feedback signals caused by low isolation of a transmission/reception antenna by converting a transmitted Radio Frequency (RF) signal into a signal of a predetermined band and subtracting a replica of the feedback signal from the converted signal, and by compensating for channel distortion of a reception signal by estimating an inverse of reception channel from a signal acquired by removing the feedback signal, and an on-channel repeating method.
摘要:
A method and an apparatus for transmitting additional data in a digital terrestrial broadcasting system are provided. The apparatus includes: a main signal generating unit channel-coding main data and converting the main data into a main signal; an additional signal generating unit channel-coding additional data and converting the additional data into an additional signal; a mixed signal generating unit generating a mixed signal by coupling the main signal and the additional signal to each other; and a mixed signal transmitting unit modulating the mixed signal and transmitting the modulated mixed signal to a receiver through a transmission antenna, wherein the additional data is additional data requested by a specific user possessing the receiver and the specific user provides information on an additional data transmitter.