Patent application number | Description | Published |
20090016471 | Impulse Noise Detection and Mitigation In Receivers - Methods and apparatus, including computer program products, are provided for detecting and mitigating noise, such as impulse noise. In one aspect, there is provided a noise suppressor to determine a predicted value for a sample in a bit stream, the predicted value determined without regard to an average of the bit stream. The noise suppressor may also detect whether impulse noise is present based on a difference between the predicted value and the sample. The noise suppressor may also identify the sample as impulse noise to enable the sample to be replaced with another value. | 01-15-2009 |
20090161773 | Channel Estimation Of Orthogonal Frequency Division Multiplexed Systems - Methods and apparatus, including computer program products, are provided for channel estimation. In one aspect, there is provided a receiver including a demodulator for decoding a signal including at least one of a transmission parameter signaling (TPS) carrier and a data carrier. The receiver further includes a channel estimator, coupled to the demodulator, for determining a channel estimate for the TPS carrier. Moreover, the receiver includes an interpolator, coupled to the channel estimator, for determining, based on the determined channel estimate for the TPS carrier, another channel estimate for the data carrier. Related systems, methods, and articles of manufacture are also disclosed. | 06-25-2009 |
20090217138 | ITERATIVE DECODING OF PACKET DATA - A receiver employs iterative decoding of packet data, where the packet data represents a data frame encoded with at least two logical dimensions. A logical dimension refers to a layer, or sub-layer, of a layered network architecture. Consequently, a first logical dimension of encoding might refer to error detection in a packet frame at the data link layer, while a second logical dimension of coding might refer to error detection/correction encoding at a physical layer. For example, a data frame might be divided into several packets, each with a corresponding cyclic redundancy check (CRC) value as coding in the first logical dimension, which are then transmitted with a convolutional code as coding in the second logical dimension. The receiver performs iterative decoding in the first and second logical dimensions until either i) all errors are identified and corrected or ii) another type of stopping condition is met. | 08-27-2009 |
20090316841 | NULL DETECTION AND ERASURE DECODING FOR FREQUENCY SELECTIVE CHANNELS IN A BROADCASTING SYSTEM - A null detection and erasure decoding process for a frequency selective channel in a broadcasting system. An orthogonal frequency-division multiplexing (OFDM) receiver receives an input bitstream, determines a noise level of the received input bitstream, and then detects a null in the input bitstream based on the noise level. Once a null is detected, the presence of the null is signaled to a decoder, allowing the decoder to process the null as an erasure. | 12-24-2009 |
20100014600 | WINDOW POSITION OPTIMIZATION FOR PILOT-AIDED OFDM SYSTEM - A window position optimization for a pilot-aided OFDM system is disclosed. A method of reducing aliasing in an orthogonal frequency division multiplexing (OFDM) system, using window optimization and pilots comprises receiving an RF signal including a pilot, generating a channel frequency response estimate, interpolating the channel estimate to calculate a pilot carrier frequency response, and dynamically selecting a window to capture a channel impulse response to prevent aliasing. | 01-21-2010 |
20100124292 | Method and System for Receiver Synchronization - Provided is a method for synchronizing a multiple carrier receiver to receive a transmitted signal. The method includes determining a location of one or more scattered pilot carriers in a received symbol sequence and modulating the scattered pilot carriers in accordance with a single pseudorandom binary sequence. The method also includes performing phase error correction via the modulated scattered pilot carriers. | 05-20-2010 |
20100124293 | Method to Reduce Peak to Average Power Ratio in Multi-Carrier Modulation Receivers - Provided is a method for performing channel estimation in an Orthogonal Frequency Division Multiplexed (OFDM) signal. The method includes performing the channel estimation based upon use of reserved tone channel carriers. | 05-20-2010 |
20100124296 | Method and System to Reduce Peak to Average Power Ratio in Multi-Carrier Modulation Receivers - Provided is a method for performing channel estimation in an Orthogonal Frequency Division Multiplexed (OFDM) signal. The method includes performing the channel estimation based upon use of reserved tone channel carriers. | 05-20-2010 |
20100124300 | METHOD AND SYSTEM FOR RECEIVER SYNCHRONIZATION - Provided is a method for synchronizing a multiple carrier receiver to receive a transmitted signal. The method includes determining a location of one or more scattered pilot carriers in a received symbol sequence and modulating the scattered pilot carriers in accordance with a single pseudorandom binary sequence. The method also includes performing phase error correction via the modulated scattered pilot carriers. | 05-20-2010 |
20130058440 | METHOD TO REDUCE PEAK TO AVERAGE POWER RATIO IN MULTI-CARRIER MODULATION RECEIVERS - A method for performing channel estimation in an orthogonal frequency division multiplexing (OFDM) signal includes choosing reserved tones to be part of a pilot pattern, and using the reserved tones in the pilot pattern to perform the channel estimation. An apparatus for use in performing channel estimation in an OFDM system includes a receiver configured to receive a transmitted OFDM signal; a pilot symbol extractor configured to extract pilot symbols from the OFDM signal; and a channel estimator configured to perform the channel estimation, including using reserved tones as pilot tones. | 03-07-2013 |