| Patent application number | Description | Published |
|---|
| 20080239936 | METHOD AND APPARATUS FOR MITIGATING INTERFERENCE IN MULTICARRIER MODULATION SYSTEMS - A method and apparatus for mitigating the effect of adjacent channel interference in a multicarrier modulation system is provided. The method includes receiving an encoded signal over multiple subcarriers at different frequencies. The signal includes a plurality of pilot symbols and data symbols modulated onto the subcarriers using a modulation technique. Further, the method includes: grouping the subcarriers into multiple sets of subcarriers based on their frequencies, wherein each set includes one or more subcarriers; estimating, for each set of subcarriers, a noise value associated with at least a portion of the pilot symbols received over subcarriers included in the set; and generating a decoded signal comprising a plurality of decoded data bits, using the estimated noise values. | 10-02-2008 |
| 20080273633 | METHOD AND DEVICE FOR ENHANCING SIGNAL DETECTION IN A FREQUENCY SELECTIVE FADING CHANNEL - A method and system are provided for enhanced signal detection in a frequency selective fading channel. Improved signal detection is realized by replacing single matched filters with multiple matched filters. The single matched filter spectrum is partitioned by frequency into M matched filter groups, where M is a positive integer greater than one. The filter bandwidth of each of the M matched filters is less than the bandwidth of the single matched filter from which they are derived. The M matched filters are provided to filter in parallel fashion the input signal into M sub-spectrums of the signal. The input signal is filtered through the M matched filters and also sent to the energy detector. The matched filter outputs are combined and the received signal is detected using the combined output and the energy in the received signal. | 11-06-2008 |
| 20080320357 | METHOD AND APPARATUS FOR REDUCING SIGNALING OVERHEAD IN A COMMUNICATION SYSTEM USING HYBRID AUTOMATIC REPEAT REQUEST - A transmitting unit combines a slot identifier (SI) and a block identifier (BI) in each header that is transmitted with the data to allow a receiving unit to associate previously received data blocks with retransmissions, or retries, of the same respective data blocks in order to perform bit error detection in accordance with a hybrid or selective ARQ protocol. The receiving unit uses the SI and BI contained in the MHBKs to determine a correspondence between a retried data and a previously transmitted data block. | 12-25-2008 |
| 20100157959 | METHOD AND DEVICE FOR ASSIGNING TRAFFIC CHANNELS IN A WIRELESS COMMUNICATION SYSTEM - A device uses a method for assigning a traffic channel in a wireless communication system. The method includes: receiving on a control channel a first message that includes a request for a traffic channel having a traffic channel structure; determining a delay in arrival of the first message; comparing the delay in arrival to a threshold value for the traffic channel structure; and when the delay in arrival exceeds the threshold value, assigning an available traffic channel in response to the request, wherein the traffic channel has a delay tolerance that exceeds the delay in arrival. | 06-24-2010 |
| 20100251070 | METHOD FOR ASSIGNING AND UTILIZING FORWARD ERROR CORRECTING (FEC) CODES - An assignment scheme exploits the Media Access Control (MAC) layer protocol features under various MAC layer call scenarios. In one embodiment, the Hamming distance between pairs of critical Data Units are assigned to codewords with a minimum distance of dmin2=8 bits, thereby increasing the hard decision error correcting capability from 1 bit to 3 bits when deciding between these pairs of Data Units. The method for assigning data unit identification (DUID) codes by a radio operating within a wireless communication system includes determining by the radio whether an expected burst is a 4 Voice Burst with Encryption Synchronization Signaling (4V); when the expected burst is 4V, decoding the DUID within the received burst using an increased minimum distance; and when the expected burst is not 4V, decoding the DUID within the received burst using a minimum distance. | 09-30-2010 |
| 20110075771 | METHOD AND APPARATUS FOR MITIGATION OF INTERFERENCE - A method of reducing error in transmissions received in a receiver is provided. A transmission containing a synchronization signal is inputted through a first filter to a synchronization correlator, to generate a timing error of the synchronization signal. An amount of delay of the synchronization signal sufficient to reduce the timing error is determined. The transmission is delayed by the amount of delay by being passed through at least a second, variable filter whose delay is determined using a stochastic gradient algorithm. The synchronization correlator may also generate a deviation error of the synchronization signal and determine an amount of deviation correction sufficient to reduce the deviation error as well as generating a frequency error of the synchronization signal and determining an amount of frequency correction sufficient to reduce the frequency error. | 03-31-2011 |
| 20110075774 | METHOD AND APPARATUS FOR MITIGATION OF INTERFERENCE - A signal is provided to each of nominal, higher and lower primary filters in a receiver. The nominal, higher and lower primary filters have different center frequencies and a bandwidth B1 and bandwidths B2, respectively and a bandwidth offset B0, with B2=B1+B0. Signal recovery is performed on the output of each primary filter to obtain recovered signals and error values each associated with one of the primary filters. Each error value is provided to a secondary and tertiary filter, to generate a signal criterion, and whose output is measured to generate a quality metric, respectively, associated with each recovered signal. The recovered signal associated with the nominal primary filter and any other recovered signal having an associated signal criterion below a threshold value is selected and the selected recovered signal which has the lowest associated quality metric is chosen. | 03-31-2011 |
