Jahan Ghofraniha

US Patent:

20220229344, Jul 21, 2022

Filed:

Jan 12, 2022

Appl. No.:

17/574413

Inventors:

- Milpitas CA, US
Jahan Ghofraniha - San Jose CA, US
Shih H. Mo - Milpitas CA, US

International Classification:

G02F 1/35
G01S 13/89

Abstract:

A microwave imaging system is provided. The microwave imaging system comprises a dual-comb transceiver module and a processing module. The dual comb transceiver module comprises a transmitter module for transmitting an output signal, at least one receiver module for receiving the output signal from the transmitter via a channel and for generating a first output signal, and a reference receiver module for receiving a portion of the output signal transmitted by the transmitter module via an attenuator module and for generating a second output signal. Further, one or more channel parameters associated with the microwave imaging are determined based on the first output signal and the second output signal.

US Patent:

20170077970, Mar 16, 2017

Filed:

Nov 28, 2016

Appl. No.:

15/362080

Inventors:

- Markham, CA
Jahan Ghofraniha - San Jose CA, US
Med A. Nation - Sunnyvale CA, US

International Classification:

H04B 1/04
H04L 25/08
H04W 52/52

Abstract:

Various embodiments of communication systems and methods in which the communication system is operative to find, record, and use sets of pre-distortion parameters in conjunction with a pre-distortion procedure, in which each set of pre-distortion parameters is operative to specifically counter distortions produced in a power amplifier by a specific combination of level of input signal power and level of analog gain associated with a transmission path of the communication system. In some embodiments, there is a modulator, a transmission chain, a distortion analysis mechanism, and a pre-distortion mechanism, operative to analyze and modify signals so as to counter signal distortion.

US Patent:

20160094376, Mar 31, 2016

Filed:

Nov 2, 2015

Appl. No.:

14/929937

Inventors:

- Markham, CA
Jahan Ghofraniha - San Jose CA, US
Med A. Nation - Sunnyvale CA, US

International Classification:

H04L 27/26
H04B 1/10
H04B 7/04
H04B 1/12

Abstract:

Various embodiments of wireless communication systems and methods in which the system seamlessly dual-uses a receiver chain for incoming transmissions and for other signal sensing purposes. The system is configured such that there are multiple receiver chains, and at least one receiver chain alternates between receiving a communication signal with information payload and receiving other signals solely for the purposes of monitoring and/or improving some aspects of the system. In various embodiments, the alternating receiver chain receives alternatively signals with information payloads and signals which have passes through a power amplifier with amplifier distortion characteristics. In various embodiments, the alternating receiver chain receives alternatively signals with information payloads and signals which may be associated with background noise, or other radio transmissions.

US Patent:

20160020791, Jan 21, 2016

Filed:

Sep 30, 2015

Appl. No.:

14/870633

Inventors:

- Markham, CA
Jahan Ghofraniha - San Jose CA, US
Med A. Nation - Sunnyvale CA, US

International Classification:

H04B 1/04
H03G 3/30
H03F 3/21
H03F 1/02
H03F 3/19

Abstract:

Various embodiments of communication systems and methods in which the communication system is operative to find, record, and use sets of pre-distortion parameters in conjunction with a pre-distortion procedure, in which each said set of pre-distortion parameters is operative to specifically counter distortions produced in a power amplifier by a specific combination of level of input signal power and level of analog gain associated with a transmission path of the communication system. In some embodiments, there is a modulator, a transmission chain, a distortion analysis mechanism, and a pre-distortion mechanism, operative to analyze and modify signals so as to counter signal distortion.

US Patent:

20150288547, Oct 8, 2015

Filed:

Mar 30, 2015

Appl. No.:

14/672361

Inventors:

- Markham, CA
Jahan Ghofraniha - San Jose CA, US
Med A. Nation - Sunnyvale CA, US

International Classification:

H04L 25/08
H03F 3/21
H03F 1/32
H03F 3/19
H04W 52/52
H04W 52/26

Abstract:

Various embodiments of communication systems and methods in which the communication system is operative to find, record, and use sets of pre-distortion parameters in conjunction with a pre-distortion procedure, in which each set of pre-distortion parameters is operative to specifically counter distortions produced in a power amplifier by a specific combination of level of input signal power and level of analog gain associated with a transmission path of the communication system. In some embodiments, there is a modulator, a transmission chain, a distortion analysis mechanism, and a pre-distortion mechanism, operative to analyze and modify signals so as to counter signal distortion.

US Patent:

20150222299, Aug 6, 2015

Filed:

Apr 3, 2014

Appl. No.:

14/244667

Inventors:

- Markham, CA
Jahan Ghofraniha - San Jose CA, US
Med A. Nation - Sunnyvale CA, US

International Classification:

H04B 1/04
H03F 3/21
H03F 3/19
H03F 3/24

Abstract:

Various embodiments of communication systems and methods in which the communication system is operative to find, record, and use sets of pre-distortion parameters in conjunction with a pre-distortion procedure, in which each said set of pre-distortion parameters is operative to specifically counter distortions produced in a power amplifier by a specific combination of level of input signal power and level of analog gain associated with a transmission path of the communication system. In some embodiments, there is a modulator, a transmission chain, a distortion analysis mechanism, and a pre-distortion mechanism, operative to analyze and modify signals so as to counter signal distortion.

US Patent:

20150222310, Aug 6, 2015

Filed:

Feb 2, 2014

Appl. No.:

14/170622

Inventors:

- Markham, CA
Jahan Ghofraniha - San Jose CA, US
Med A. Nation - SUNNYVALE CA, US

International Classification:

H04B 1/12
H04B 7/04

Abstract:

Various embodiments of wireless communication systems and methods in which the system seamlessly dual-uses a receiver chain for incoming transmissions and for other signal sensing purposes. The system is configured such that there are multiple receiver chains, and at least one receiver chain alternates between receiving a communication signal with information payload and receiving other signals solely for the purposes of monitoring and/or improving some aspects of the system. In various embodiments, the alternating receiver chain receives alternatively signals with information payloads and signals which have passes through a power amplifier with amplifier distortion characteristics. In various embodiments, the alternating receiver chain receives alternatively signals with information payloads and signals which may be associated with background noise, or other radio transmissions.

US Patent:

20150223176, Aug 6, 2015

Filed:

Feb 2, 2014

Appl. No.:

14/170623

Inventors:

- Markham, CA
Jahan Ghofraniha - San Jose CA, US
Med A. Nation - Sunnyvale CA, US

International Classification:

H04W 52/22

Abstract:

Various embodiments of wireless communication systems and methods in which the system applies a clipping and filtering procedures iteratively in order to reduce the peak-to-average power ratio of a transmission. In various embodiments, the clipping level changes in each iteration. In various embodiments, the clipping mechanism is a polar clipping mechanism. In various embodiments, out-of-band signal filtering is executed by a filter. In various embodiments, there is a pre-clipping process, which may be executed by a decimation mechanism, or alternatively by a zero-padding mechanism. In various embodiments, the clipping mechanism and filter are embedded in one or more processors, any one of which may be a DSP processor. In various embodiments, clipping levels are determined by a look-up table.