Patent application number | Description | Published |
20090019508 | Memory reduction in DVB-H applications - A method of storing DVB-H data from a DVB-H data burst, the method comprising: identifying erasures in the data burst; and storing non-erasure data from the data burst in memory locations of a memory that would be used to store erasures. | 01-15-2009 |
20090052582 | Method for improving the performance of ofdm receiver and a receiver using the method - One or more parameters of a tuner of a receiver may be adjusted by generating for the receiver one or more control signals associated with one or more parameters and applying control signals to the tuner during a cyclic prefix (CP) period. The receiver may generate a control strobe in synchronization with the CP period wherein the control strobe essentially begins with the CP period and has duration preferably shorter than the duration of the CP period. The duration of the control strobe may be chosen such that the one or more control signals, after being applied to the tuner, each reaches its steady state before the CP period lapses. The adjusted parameters, alone or in combination, may be, for example, the gain of the low-noise-amplifier (LNA), the synthesizer's local frequency, the DC correction level, the power gain amplifier, and the I/Q error, and the like. The demodulator of the receiver may generate one or more of the control signals required for adjusting one or more parameters. One or more control signals may be determined according to previously received symbols/transmissions, and by determining the tuner's parameters to be adjusted based on the receiver's continued performance evaluations, and generating and applying the control signals to the tuner as a consequence of or in relation to these evaluations. | 02-26-2009 |
20090055715 | System and Method for Mitigating Memory Requirements - A receiver is provided, which is adapted to receive MPE-FEC frames and to correct erroneous sections within a received MPE-FEC frame by detecting unreliable sections and storing in an erasure list (“ESL”) table compressed data that includes the base address of each detected erroneous section, together with the respective section's size. The size of the ESL table may be fixed, or it may correlate, or dynamically change according to the actual number of detected erroneous sections. The data stored in the erasure list may then be forwarded to a decoder to correct erroneous sections. The erroneous sections may be detected by using CRC, and the decoder may be a Reed-Solomon decoder. If the application data table of the MPE-FEC is error-free (or full or errors), in which case the erasure structure list is empty (or full of errors), in which case the erasure structure list is empty (or full), this means that no FEC reception and error corrections are required, because there are no sections to correct in the first case and the decoder is incapable of correcting too many sections in the second case. Therefore, the receiving circuitry, or at least the decoder, may be disabled to save battery power. | 02-26-2009 |
20100205516 | AUDIO ERROR DETECTION AND PROCESSING - A method of processing a DAB audio stream, the method comprising: receiving a compressed and modulated DAB audio stream comprising a plurality of audio frames encoded with scale factors and a DAB-CRC error detection code for indicating errors in the scale factors; demodulating the DAB stream; and processing the demodulated and still compressed DAB stream responsive to the DAB-CRC of at least one audio frame of the plurality of audio frames; by determining a trend in values of scale factors and repairing or concealing the error in the scale factor responsive to the trend. | 08-12-2010 |
20110044413 | Method circuit and system for adapting a receiver receive chain based on detected background noise - Disclosed is a radio frequency (RF) receiver for receiving a communication channel modulated on one or more carrier frequencies. The receiver may include a gain adjustable RF amplifier, a wideband signal power measurement circuit, and control logic. The control logic may be adapted to use outputs of one or more measurement circuits to classify interfering signals based on measured signal power and spectral proximity to the one or more channel carrier frequencies, and to adjust the gain of the radio frequency amplifier based on the classification. | 02-24-2011 |
20110129030 | Method circuit and system for transmitting and/or receiving signals - Disclosed is a radio frequency digital transmitter adapted to transmit content using a frame based protocol where each (data) frame may be parsed into two or more timeslots. The transmitter may comprise a bandwidth adjustable modulator adapted to modulate a data frame provided by an encoder and an encoder adapted to encode each of a set of data services into one or more timeslots of the data frame, based on the bandwidth of the modulator. The encoder may select a number of timeslots to insert into the data frame based on the bandwidth of the modulator. | 06-02-2011 |
20110228881 | Method circuit and system for adapting a receiver to receive chain components based on characteristics of a received signal - Disclosed is a method, circuit and system for adapting a receiver to receive chain based on characteristics of a received signal. There is provided a circuit and system for wireless data communication along a given radio frequency (RF) carrier frequency or a plurality of carrier frequencies from the set of available carrier frequencies. Communication signals may be transmitted and received along a given channel (i.e. a RF signal with some bandwidth centered at a given carrier frequency or a plurality of carrier frequencies) or a plurality of channels from the set of available channels. According to further embodiments of the present invention, the circuit may include an RF transmitter for wireless data broadcasting. | 09-22-2011 |
20110235761 | Method circuit and system for received signal noise reduction or cancellation - Disclosed are methods, circuit and devices for received signal noise reduction of cancellation. There is provided a first and a second antenna spatially separated from one another. A noise extractor may generate a signal indicative of noise received at the second antenna, and a channel estimator may estimate one or more parameters of a channel between the first and the second antennas. A filter may modify the signal indicative of noise received at the second antenna using the one or more estimated channel parameters to generate a signal estimating noise received at said first antenna. A signal subtracting module may subtract from a signal received at the first antenna the signal estimating noise received at said first antenna. | 09-29-2011 |
20110243209 | Method device & system for receiving a communication signal - Disclosed is a receiver, such as an orthogonal frequency-division multiplexing (OFDM) receiver, including two or more receiver chains. Each of the receiver chain may include an antenna, down converting circuitry and time to frequency converting circuitry, and the two or more chains may be adapted to operate in concert so as to receive substantially the same signal substantially concurrently. Signal processing circuitry may be adapted to constructively combine signals received at the two or more receiver chains into a unified signal. Selection logic may be adapted to select a mode of signal combination by the signal processing circuitry, wherein the selection logic may be adapted to instruct the processing circuit to either combine two or more received signals into a single received signal or to use only one of the two or more received signals for further processing. | 10-06-2011 |
20120013803 | Method circuit and system for receiving a signal - A method, circuit and system for receiving a data signal uses two or more antennas adapted to receive a common data signal. The system includes mode selection logic to determine a mode of extracting data from a common signal received on either or both antennas. The mode may include a signal combination mode and/or a noise reduction mode. | 01-19-2012 |
20120128107 | RECEIVER WITH CONFIGURABLE CLOCK FREQUENCIES - A method includes, in a receiver that operates using multiple clock signals having respective clock frequencies, accepting a request to receive a target channel frequency. In response to the request, a set of preferred clock frequencies is calculated, which when applied by the receiver will cause the receiver to tune to the target channel frequency while satisfying a predefined criterion relating to interference caused by the clock signals. The target channel frequency is received by setting the clock signals to the preferred clock frequencies. | 05-24-2012 |
20120243428 | METHOD CIRCUIT AND SYSTEM FOR ADAPTING A RECEIVER RECEIVE CHAIN BASED ON DETECTED BACKGROUND NOISE - Disclosed is a radio frequency (RF) receiver for receiving a communication channel modulated on one or more carrier frequencies. The receiver may include a gain adjustable RF amplifier, a wideband signal power measurement circuit, and control logic. The control logic may be adapted to use outputs of one or more measurement circuits to classify interfering signals based on measured signal power and spectral proximity to the one or more channel carrier frequencies, and to adjust the gain of the radio frequency amplifier based on the classification. | 09-27-2012 |
20130023222 | FORWARD FILTER TRAINING SCHEME - A method includes receiving an input signal carrying transmitted values by a receiver, which includes a decision device that produces estimates of the transmitted values. The input signal is filtered using a forward filter to produce a forward-filtered signal, and the estimates of the transmitted values are filtered using a backward filter to produce a backward-filtered signal. The decision device is applied to a composite signal produced from the forward-filtered and backward-filtered signals, so as to produce the estimates of the transmitted values. An accuracy of the estimates of the transmitted values is assessed, and coefficients of the forward filter are adapted depending on the assessed accuracy. | 01-24-2013 |
20130077719 | DIVERSITY SCHEMES FOR 2-D ENCODED DATA - A method for communication includes receiving a signal carrying data including multiple data units using at least first and second reception channels. The data units are encoded with first and second codes such that, when the data units are arranged in rows and columns, the rows are encoded with the first code and the columns are encoded with the second code. The data units received by the first and second reception channels are selectively combined to produce composite data, which includes at least one row or column that includes a first data unit received from the first reception channel and at least a second data unit received from the second reception channel. The first and second codes for the composite data are decoded, including the at least one row or column, so as to reconstruct the data. | 03-28-2013 |
20130215952 | TURBO EQUALIZATION FOR DIVERSITY RECEIVERS - Apparatus includes a slave equalizer chain, which includes a first decoder and a first adaptive filter including first coefficients, and is configured to filter a first signal using the first adaptive filter to produce a first filtered signal, to decode the first filtered signal using the first decoder to generate a first output, and to adapt the first coefficients based at least on the first output. A master equalizer chain includes a second decoder and a second adaptive filter including second coefficients, and is configured to filter a second signal using the second adaptive filter to produce a second filtered signal, to calculate a weighted combination of the second filtered signal and the first filtered signal produced in the slave equalizer chain, to decode the weighted combination using the second decoder to generate a second output, and to adapt the second coefficients based at least on the second output. | 08-22-2013 |
20130343489 | DEMAPPER FOR ROTATED QAM CONSTELLATIONS - A method includes receiving a symbol modulated with multiple bits according to a signal constellation including multiple constellation points. A soft metric is computed for a given bit in the symbol: A first constellation point closest to the received symbol according to a distance measure is found. A row or column of the constellation points, which is closest to the first constellation point according to the distance measure, and over which a value of the given bit is constant and is opposite to the value of the given bit in the first constellation point, is identified. At least the identified row or column is searched for a second constellation point that is closest to the received symbol according to the distance measure. The soft metric is calculated based on the first and second constellation points. The value of the given bit is reconstructed based on the soft metric. | 12-26-2013 |