Patent application number | Description | Published |
20100098193 | APPARATUS AND METHOD FOR CLASSIFYING MODULATIONS IN MULTIPATH ENVIRONMENTS - A receiver supports a single carrier (SC) form of modulation and a multi-carrier form of modulation such as orthogonal frequency division multiplexing (OFDM). Upon receiving a signal, the receiver determines a maximum fluctuation range (MFR) as a function of at least a fourth-order cumulant of a received signal; and classifies a modulation type of the received signal as a function of the determined maximum fluctuation range. After determining the modulation type of the received signal, the receiver switches to that modulation mode to recover data from the received signal. | 04-22-2010 |
20100157835 | Method and device for determining channel quality - It is provided a method for determining channel quality for a second channel, wherein, the second channel is overlapping with a first channel, the method comprising the steps of sending a request message through the first channel; receiving a response message on the second channel in response to the request message through the first channel; and determining the channel quality of the second channel based on the response message on the second channel. It can be used to determine the channel quality of at least one channel by sending a single message through the first channel. | 06-24-2010 |
20110078533 | SERIAL CONCATENATION OF TRELLISCODED MODULATION AND AN INNER NON-BINARY LDPC CODE - A concatenated coded modulation communication system and method combines Trellis Coded Modulation with non-Gray code constellation mapping, interleaving, and non-binary Low Density Parity Check coded channel modulation with Gray code constellation mapping to improve error performance. | 03-31-2011 |
20110090948 | ADAPTIVE QAM TRANSMISSION SCHEME TO IMPROVE PERFORMANCE ON AN AWGN CHANNEL - A cable transmitter supports a number of low density parity check (LDPC) coding rates, e.g., 1/4, 1/3, 2/5, 1/2, 3/5, 2/3, 3/4, 4/5, 5/6, 8/9 and 9/10; and supports a number of quadrature amplitude modulation (QAM) schemes, e.g., 4-QAM, 16-QAM, 64-QAM, 256-QAM, 1024-QAM or higher. For a selected modulation scheme, the cable transmitter selects between using a non-uniform symbol constellation or a uniform symbol constellation as a function of a selected coding rate. | 04-21-2011 |
20130305126 | METHOD FOR TRANSMITTING AND RECEIVING SIGNALLING INFORMATION - A method for protecting signalling information in a frame to be transmitted to a receiver in a communication system, comprising: encoding frame signalling information of the frame to protect the frame signalling information; and encoding Forward Error Correction FEC block signalling information of FEC blocks in the frame by using Reed-Muller codes to protect the FEC block signaling information. | 11-14-2013 |
Patent application number | Description | Published |
20100290391 | APPARATUS AND METHOD FOR ACCESSING MULTIPLE WIRELESS NETWORKS - The present invention provides an apparatus and method for concurrently accessing multiple wireless networks, comprising: a host for allocating a plurality of virtual MAC addresses based on the number of the wireless networks to be accessed, and a plurality of virtual MAC devices each having one of the virtual MAC addresses allocated by the host, for accessing the multiple wireless networks concurrently; wherein a physical address of the apparatus is set as a transmitter or receiver address of frames for accessing the multiple wireless networks concurrently. | 11-18-2010 |
20110264982 | Method for transmitting and receiving signalling information - A method for protecting signalling information in a frame to be transmitted to a receiver in a communication system, comprising: encoding frame signalling information of the frame to protect the frame signalling information; and encoding Forward Error Correaction FEC block signalling information of FEC blocks in the frame by using Reed-Muller codes to protect the FEC block signaling information. | 10-27-2011 |
20120134446 | METHOD AND APPARATUS FOR RECEIVING DATA - Modem coding and modulation techniques have greatly improved the transmission and reception of signals. A method is described including receiving a signal de-mapping the signal into a first and second substream, decoding the first and second substream using a low density parity check decoding process, and combining the first and second decoded substream into a single data stream. An apparatus is described including a symbol de-mapper that receives a signal de-maps the modulation symbols in the signal into a first and second substream, a first decoder that decodes the first substream using a low density parity check coding process at a first decoding rate, a second decoder that decodes the second substream at a second encoding rate, and a combiner that combines the first substream and the second substream into a single data stream. | 05-31-2012 |
20130305125 | METHOD FOR TRANSMITTING AND RECEIVING SIGNALLING INFORMATION - A method for protecting signalling information in a frame to be transmitted to a receiver in a communication system, comprising: encoding frame signalling information of the frame to protect the frame signalling information; and encoding Forward Error Correction FEC block signalling information of FEC blocks in the frame by using Reed-Muller codes to protect the FEC block signaling information. | 11-14-2013 |
Patent application number | Description | Published |
20100002788 | INTERPOLATING METHOD FOR AN OFDM SYSTEM AND CHANNEL ESTIMATION METHOD AND APPARATUS - The present invention provides an interpolating method for an OFDM system, a channel estimation method and apparatus, in which each OFDM symbol has scattered pilots inserted, and the interpolating method comprising: the step of inserting at least one copy of the first scattered pilot in each OFDM symbol before the first scattered pilot as virtual pilots, and inserting at least one copy of the last scattered pilot in each OFDM symbol behind the last scattered pilot as virtual pilots, after obtaining the channel state information on the sub-channels which propagate the scattered pilots in the OFDM symbols by linear filtering; and the step of performing interpolation by a FIR filter with the channel state information. | 01-07-2010 |
20100034300 | Receiver and method for receiving digital signal - The present invention provides a receiver for receiving digital signals including frames with a binary modulated cyclic preamble, comprising: means for correlating at least part of a first cyclic preamble in a first frame and at least part of a second cyclic preamble in a second frame, and for determining a carrier frequency offset based on said correlation. | 02-11-2010 |
20100061478 | METHOD FOR SYMBOL SYNCHRONIZATION OF RECEIVED DIGITAL SIGNAL AND DIGITAL SIGNAL RECEIVER USING THE SAME METHOD - A method for symbol synchronization of received digital signal and a digital signal reception apparatus are provided. The method comprises steps of correlating the received digital signal with the received signal delayed by one symbol so as to obtain a first correlation value result as a combined effort of a strongest path and other paths; removing substantially effect of the strongest path from the first correlation result so as to obtain a second correlation result which exhibits contribution of a fastest path; searching a maximum correlation value and its position of the fastest path so as to determine symbol synchronization timing for initiating FFT processing. The digital signal reception apparatus is characterized by a symbol timing detecting unit for determining symbol synchronization timing of the fastest path through substantially removing the effect of a strongest path. | 03-11-2010 |
20100080327 | METHOD AND DEVICE FOR AUTOMATIC GAIN CONTROL - A method for automatic gain control used in a receiver of a multi-carrier telecommunication system, the method comprising: receiving an input signal digitalized by an A/D converter; determining distribution of the input signal; and controlling gain of a variable gain amplifier as a function of the determined distribution. | 04-01-2010 |
20100119013 | APPARATUS AND METHOD FOR REMOVING COMMON PHASE ERROR IN A DVB-T/H RECEIVER - A receiver is a Digital Video Broadcasting-Terrestrial/Handheld (DVB-T/H) receiver. The DVB-T/H receiver comprises a fast fourier transform (FFT) operative on a signal for providing an FFT output signal comprising a number of samples; a spectrum shifter for reordering the samples in the FFT output signal to provide a spectrum shifted signal; and a phase corrector for estimating a phase error from the FFT output signal and for correcting a phase of the spectrum shifted signal in accordance with the estimated phase error. | 05-13-2010 |
20100142658 | APPARATUS AND METHOD FOR REMOVING COMMON PHASE ERROR IN A DVB-T/H RECEIVER - A receiver is a Digital Video Broadcasting-Terrestrial/Handheld (DVB-T/H) receiver. The DVB-T/H receiver comprises a phase error corrector and a channel estimation and equalization element. The phase error corrector rotates a signal in accordance with an estimate of a phase error, e.g., CPE, which is determined as a function of channel state information (CSI) provided by the channel estimation and equalization element. | 06-10-2010 |
20110129035 | SELF-ADAPTIVE FREQUENCY INTERPOLATOR FOR USE IN A MULTI-CARRIER RECEIVER - A Digital Video Broadcasting-Terrestrial/Handheld (DVB-T/H) receiver comprises a controller and a frequency interpolator for use in estimating channel state information (CSI) information of a received signal by frequency interpolation. The controller determines a multi-path delay (T | 06-02-2011 |
20120287803 | METHOD AND APPARATUS FOR CHANNEL ESTIMATION - The present invention provides a method for channel estimation used in a receiver of a multi-carrier communication system, including: receiving a multi-carrier symbols from a transmitter of the multi-carrier communication system; and obtaining channel information of sub-carriers carrying data of the multi-carrier symbols, using selectively time direction interpolation and frequency direction interpolation for channel information of a plurality of scatter pilots of the multi-carrier symbols. | 11-15-2012 |