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Keerthi
Arvind Keerthi, Bangalore IN
| Patent application number | Description | Published |
|---|---|---|
| 20110032033 | PRE-DISTORTION AND MEMORY COMPENSATION APPARATUS - Pre-distortion and memory compensation apparatuses and methods for a non-linear component are provided. The apparatus comprises an adaptive block for generating a plurality of correlation coefficients, which are used to weight a plurality of synthesis work functions to pre-distort a given signal. The adaptive block can be driven by an error signal generated from a feedback signal from the non-linear component output signal and a delayed version of the input signal. The apparatus is capable of being operated directly at radio frequency. Also provided are apparatuses and methods for generation of quadrature signals, transconductance amplification employing negative resistance, variable-gain amplification, and envelope detection. | 02-10-2011 |
Arvind V. Keerthi, Bangalore IN
| Patent application number | Description | Published |
|---|---|---|
| 20100054356 | INTERFERENCE AVOIDING MIMO - Method and apparatus for communicating a radio signal between a first station and a second station, including estimating at least one characteristic of a radio channel from the first station including a first plurality of weightable transceiving elements, to the second station including a second plurality of weightable transceiving elements; calculating a receive weighting of at least one weightable transceiving element at the second station, responsive to the estimate; calculating a transmit weighting of at least one weightable transceiving element at the first station; and then communicating the radio signal by transmitting from the transmit-weighted transceiving elements at the first station, over the radio channel, to the receive-weighted transceiving elements at the second station, while reducing the response to unwanted interfering signals. | 03-04-2010 |
| 20110258591 | METHOD AND APPARATUS TO OPTIMIZE ADAPTIVE RADIO-FREQUENCY SYSTEMS - A performance optimizing circuit is provided for a signal processing system which is parameterized by a set of coefficients that vary the operational characteristics of the signal processing system. The performance optimizing circuit receives as input a reference signal and an output signal of the signal processing system. The performance optimizing circuit may include (a) a cost computation circuit that receives the reference signal and the output signal and provides as output a cost signal representing a cost function computed using a set of current values for the set of coefficients, the output signal and the reference signal; and (b) a cost optimizer circuit that, at each of a plurality of successive time intervals, evaluates one or more values of the cost signal in the cost computation circuit and provides to the signal processing system a new set of values for the set of coefficients. The cost optimizer circuit implements two or more of the random search, parabolic interpolation and hill climbing techniques. | 10-20-2011 |
Arvind Vijay Keerthi, Bangalore IN
| Patent application number | Description | Published |
|---|---|---|
| 20100311343 | HIERARCHICAL MODULATION FOR ACCURATE CHANNEL SOUNDING - Method and apparatus for improving the channel estimate of a communication channel between a first station and a second station, while reducing the amount of reserved bandwidth for pilot tones. Hierarchical modulation is used to augment pilot density without sacrificing throughput. At the first station, a digital information stream may be split into a base stream and an enhancement stream, wherein the base stream and the enhancement stream combined form a hierarchical signal. At the second station, the base stream may be first recovered, and recovered base stream serves as a pilot for the enhancement stream. Thus the base stream, which is a subset of the total transmitted information, may be made to perform the channel-sounding function for the enhancement stream. | 12-09-2010 |
| 20110045768 | CREATION OF A BEAM USING ANTENNAS - Method and apparatus for creating a pencil beam using a plurality of small diameter dish antennas. A plurality of small diameter dish antennas are spatially arranged and driven by varying electronic signals in such a way that the plurality of small diameter dish antennas co-operatively produce a pencil beam in the direction of a distant object. | 02-24-2011 |
Arvind Vijay Keerthi, San Diego, CA US
| Patent application number | Description | Published |
|---|---|---|
| 20120020354 | HIERARCHICAL CODING FOR MULTICAST MESSAGES - Techniques for sending signaling information using hierarchical coding are described. With hierarchical coding, individual messages for users are encoded using multiple interconnected encoders such that ( | 01-26-2012 |