| Patent application number | Description | Published |
|---|
| 20090110112 | Method and Apparatus for Reducing Phase Noise in Orthogonal Frequency Division Multiplexing Systems - Method and apparatus for reducing phase noise from a multi-carrier modulation (MCM) system, such as an orthogonal frequency division multiplexing (OFDM) system, by transmitting known data on a sub-carrier at a power level adapted to allow for accurate estimation. Preferably, the sub-carrier is the DC sub-carrier. | 04-30-2009 |
| 20090197555 | Signal Power Measurement Methods and Apparatus - Methods and apparatus in a receiver for estimating a received power of at least one signal having a pattern known to the receiver, the signal having being transmitted by at least one antenna. A method includes using a first method of measuring the received power based on the pattern, the first method generating a first sequence of first power estimates; determining whether a predetermined first event has occurred; and if the first event has occurred, changing to a second method of measuring the received power, the second method being different from the first method and generating a second sequence of second power estimates. | 08-06-2009 |
| 20090257517 | WIRELESS COMMUNICATION METHODS AND RECEIVERS FOR RECEIVING AND PROCESSING MULTIPLE COMPONENT CARRIER SIGNALS - A wireless communication system receiver receives and processes a signal comprising at least two component carriers carrying data scheduled to the receiver and having center frequencies spaced apart by at least one component carrier frequency difference. Each component carrier comprises a number of subcarriers spaced apart by a system subcarrier frequency spacing. A common divisor is obtained for the at least one component carrier frequency difference and the system subcarrier frequency spacing. A symbol is received on the subcarriers of the component carriers and downconverted to baseband to produce a baseband symbol. A block of padding values is inserted in the baseband symbol to produce a padded symbol. The length of the block of padding values is such that intermediate subcarriers are inserted to yield a subcarrier frequency spacing for the padded symbol equal to the common divisor. Finally the padded symbol is Fast Fourier Transform, FFT, processed. | 10-15-2009 |
| 20090257533 | SYSTEM AND METHOD OF RECEIVING AND PROCESSING MULTICOMMUNICATION SIGNALS - A receiver receives and front-end processes a plurality of component carrier signals, each carrier spaced apart in frequency. The digitized, baseband component carrier signals are inspected to determine estimates of timing offsets between the carriers. A control unit selects a first component carrier signal having data scheduled to the receiver. If data is scheduled to the receiver on other component carrier signals, the control unit generates timing and frequency offset adjustment control signals to time- and frequency-align each other component carrier signal having relevant data, to the first component carrier signal. All the relevant component carrier signals are then combined, and a single OFDM symbol, spanning all the relevant component carriers, is presented to an FFT for symbol detection. | 10-15-2009 |
| 20100272219 | Method and Device for Automatic Gain Control - A method and apparatus for adjusting the gain of an amplifier ( | 10-28-2010 |
| 20110135036 | IQ-Imbalance Compensation in Presence of Carrier Offset - An arrangement for processing a received wireless communication signal is disclosed. The arrangement comprises a frequency offset compensation unit ( | 06-09-2011 |
| 20110243111 | Timing of Uplink Transmissions in a Multi-Carrier Communication System - A terminal with transmitter and receiver operates in a multi-carrier communication system and receives at least two downlink carriers. One or more timing advance commands are received, each associated with a group of one or more uplink carriers, each group being associated with one or more of the received downlink carriers. For each downlink carrier associated with one of the groups of uplink carriers, one is selected as a reference downlink carrier; the reference downlink carrier timing is ascertained; and a transmission time period is ascertained based on the timing of the downlink reference carrier and an offset specified by the timing advance command associated with the group of uplink carriers. The transmission time period comprises a start time and a stop time. Transmission is initiated at an earliest transmission start time of the ascertained transmission time periods and is ceased at a latest ascertained stop time. | 10-06-2011 |
| 20110243263 | Method and Arrangements for Estimating IQ-Imbalance - An arrangement for estimating IQ-imbalance of a received OFDM-signal is disclosed. The arrangement comprises an FFT-unit ( | 10-06-2011 |
