Abstract: A carrier phase and symbol timing recovery circuit and method may be used for robust synchronization in a broadcasting ATSC receiving system. Carrier phase and symbol timing offsets may be simultaneously adjusted by using redundancy information contained in an ATSC signal spectrum. A desired sampling time instant and carrier phase offset for synchronization may be simultaneously obtained due to correlation between carrier phase and symbol timing detectors.

Abstract: A receiver and method for the same are provided. In the receiver, a decoder may decode an equalized signal to generate symbol decisions and a soft information signal. An equalizer may select boundary levels for non-uniform quantization using a soft information signal delayed by a symbol interval. The equalized signal may be generated from a feedback-filtered signal using the symbol decisions.

Abstract: Exemplary embodiments of the present invention provide a receiver, a generator, an error-averager, and a determiner and methods for the same. In exemplary embodiments of the present invention, cyclical characteristics of a signal may be used to obtain an improved signal-to-noise ratio (SNR). Exemplary embodiments of the generator may generate a signal output from an equalizer and may transmit the signal to a decoder, which may calculate a metric. The signal may be proportional to the reliability of a symbol.

Abstract: An apparatus and method for wireless communication using an acoustic signal in a system including a first device including a loudspeaker and a second device including a microphone. The first device generates wireless communication information, converts the wireless communication information to an acoustic signal, and transmits the acoustic signal to the second device using the loudspeaker. The second device receives the acoustic signal using the microphone, extracts the wireless communication information from the acoustic signal, generates an acknowledgment signal according to the extracted wireless communication information, and transmits the acknowledgment signal to the first device on a wireless communication channel.

Abstract: Exemplary embodiments of the present invention provide an equalizer combined with a decoder and a method of updating filter coefficients. The method may include calculating output error signals ek, multiplying the output error signals by a parameter, obtaining a partial value by multiplying a delayed decoder decision stored in a filter delay line corresponding to an i-th filter coefficient by the result obtaining a partial value by multiplying a constant by a feedback coefficient and obtaining an updated value by adding the two partial values.

Abstract: A receiver includes a frame boundary detector and a link controller. The frame boundary detector receives a plurality of transport stream (TS) packets and generates a control signal based on boundary information of the TS packets. The link controller disables a part of the receiver to disable forwarding of subsequent TS packets in response to the control signal. Each of the TS packets is a multi protocol encapsulation (MPE) section or a multi protocol encapsulation-forward error correction (MPE-FEC) section.

Abstract: A frequency detector includes an error measurement unit measuring a time interval between zero-crossing points of an input signal that is modulated. An error conversion unit quantizes the measured time interval using one of modulation time intervals. An error calculation unit calculates a frequency error based upon a difference between the measured time interval and the quantized time interval. An error generation control unit controls whether to output the frequency error based upon the quantized time interval, the calculated frequency error, and a predetermined critical value.

Abstract: A method reduces noise in a multiple carrier modulated (MCM) signal. Such a method may include: estimating impulse noise based in the equalized signal; and removing a portion of the noise in the equalized signal as a function of the estimated impulse noise. An apparatus reduces noise in the MCM. Such an apparatus may include: a down-converter; an analog to digital converter to digitize the output of the down-converter; a guard-interval removing unit operable upon the digitized output of the down-converter; and a combined FFT, equalization and impulse-noise-compensation unit operable upon a signal from the guard-interval-removing unit.

Abstract: Synchronization circuits are provided for orthogonal frequency division multiplexing (OFDM) receivers. The synchronization circuits include a fast Fourier transform (FFT) processor and a synchronization unit. The FFT processor is configured to perform FFT of an input signal. The synchronization unit is configured to obtain a channel impulse response (CIR) using an output signal of the FFT processor and relocate an FFT window based on the CIR. Related receivers, methods and computer program products are also provided.

Abstract: An inter-carrier interference ICI cancellation method of a kth sub-carrier of an orthogonal frequency division multiplexing OFDM receiving signal (k is a natural number greater than 1 and less than or equal to n, n is a number of sub-carriers) includes canceling an inter-carrier interference element produced by at least one sub-carrier among inter-carrier interference elements of the kth sub-carrier by a decision feedback equalization DFE method, and canceling another inter-carrier interference element produced by at least another sub-carrier among inter-carrier interference elements of the kth sub-carrier by a linear minimum mean square error equalization LMMSE method.

Abstract: An apparatus for compensating nonlinearly distorted multicarrier signals, a multicarrier signal receiver using the same, and a method therefor are provided, where the apparatus for compensating multicarrier signals and the multicarrier signal receiver using the apparatus extract parameter information on the HPA mode from the received signal so that nonlinear distortion of the received multicarrier signal is compensated for even though an accurate transfer function of a high power amplifier (HPA) is not known and side information or a special training signal is not transmitted when a signal is transmitted, such that nonlinearly distorted multicarrier signals such as OFDM signals transmitted by an HPA having a variety of transfer functions can be adaptively compensated and therefore a demodulated signal with an improved symbol error rate (SER) can be obtained.

Abstract: An apparatus and method for direct measurement of the channel state of a receiver, such as an OFDM (Orthogonal Frequency Division Multiplexing) receiver. The apparatus adapts a frequency selective channel using a squared Euclidean distance between a received signal value and a de-mapped value for measurement of the channel state and estimates the CSI (Channel State Information) which is also suitable for signal processing with co-channel interference. The estimated CSI may be used in a bit metric calculation of subsequent error correction decoders, such as a Viterbi decoder, to increase system SNR (Signal-to-Noise Ratio) gain. Because receiving equipment, such as digital televisions, receive clearer DVB-T (Terrestrial Digital Video Broadcasting) signals, clearer pictures with less distortion can be displayed, for example, on the digital television.

Abstract: A digital television (DTV) receiver is provided, comprising: a demodulator that demodulates television signals and outputs equalizer training signals in the form of real (I) and imaginary (Q) data; a sync signal detector, and a phase compensator that offsets the phase of the I and Q data based on the phase offset signal and outputs phase adjusted I data under control of the lock control signal. The sync signal detector comprises: a correlator that correlates the equalizer training signals including the I and Q data; a power calculator that calculates the sum of the power of the correlated I and Q data; a comparator that compares (the sum) against a preset threshold and outputs a compare indication signal; a sync lock controller that monitors the compare indication signal and outputs a lock control signal; and a phase calculator that calculates a phase of the equalizer training signals based on the I and Q data and outputs a phase offset signal based on the compare indication signal.

Abstract: A method an apparatus for providing channel state information in a receiver are described. In the method, direct channel state information may be generated based on a calculated error signal, and indirect channel state information may be generated based on a magnitude of a channel frequency response. A channel state selection control signal is generated based on the calculated error signal and magnitude of the channel frequency response. One of the direct channel state information and indirect channel state information may be output based on a logic state of the channel state selection control signal.

Abstract: An orthogonal frequency division multiplexing (OFDM) receiver includes a n average power calculation unit and an output unit. The average power calculation unit calculates and outputs a first average power of a null symbol section of each transmitted frame output from an OFDM transmitter and calculates and outputs second average powers of sub-carriers that correspond to each null symbol section. The output unit compares the first average power and the second average powers, to perform a reciprocal transformation on difference values of the first average power and each of the second average powers based on results of the comparisons, and to store and output reciprocally transformed values as channel state information.

Abstract: Synchronization circuits are provided for orthogonal frequency division multiplexing (OFDM) receivers. The synchronization circuits include a fast Fourier transform (FFT) processor and a synchronization unit. The FFT processor is configured to perform FFT of an input signal. The synchronization unit is configured to obtain a channel impulse response (CIR) using an output signal of the FFT processor and relocate an FFT window based on the CIR. Related receivers, methods and computer program products are also provided.

Abstract: An apparatus and method for transmitting and receiving data for a multi-channel digital broadcasting system, using advanced encoding schemes (including sub channels having a regular part and a parity part) but also compatible with the existing digital broadcasting systems. In the transmitting apparatus, a main service channel includes a plurality of sub channels, and at least one of the sub channels contains a regular part generated based on the information data and a parity part corresponding to the regular part.

Abstract: An apparatus for decoding a signal and method thereof and a TCM decoder and method thereof. The TCM decoder may calculate a branch metric based on path metrics received from a plurality of other TCM decoders. The TCM decoder may be included within a joint TCM decoder which may be included within the apparatus. In an example, the apparatus may be a time-division multiplexed trellis-coded modulation (TDM-TCM) decoder. In another example, the apparatus may further include an equalizer feedback part.

Abstract: A receiver and method for the same are provided. In the receiver, a decoder may decode an equalized signal to generate symbol decisions and a soft information signal. An equalizer may select boundary levels for non-uniform quantization using a soft information signal delayed by a symbol interval. The equalized signal may be generated from a feedback-filtered signal using the symbol decisions.

Abstract: A circuit and method for reducing impulse noise. The circuit may include a noise measuring unit which determines whether a first logic level or a delayed version of a received signal sample will be output based on a comparison of absolute values of a plurality of delayed versions of the received signal sample. The method may include delaying a received signal to generate a plurality of delayed signals and calculating the absolute value of each of the plurality of delayed signals. The amplitude of the absolute value of one of the plurality of delayed signals may be compared with the amplitudes of the other plurality of delayed signals. An output of a circuit may be set based on the result of the comparison.