US 9,813,198 B2
Systems and methods for asynchronous re-modulation with adaptive I/Q adjustment
Emerick Vann, Dublin, CA (US); Yen-Fang Chao, Pleasanton, CA (US); Youming Qin, Sunnyvale, CA (US); and Roland Matian, San Jose, CA (US)
Assigned to Aviat U.S., Inc., Milpitas, CA (US)
Filed by Aviat U.S., Inc., Santa Clara, CA (US)
Filed on Oct. 3, 2014, as Appl. No. 14/506,452.
Application 14/506,452 is a division of application No. 14/155,211, filed on Jan. 14, 2014.
Application 14/155,211 is a continuation of application No. 13/627,996, filed on Sep. 26, 2012, granted, now 8,630,600, issued on Jan. 14, 2014.
Claims priority of provisional application 61/539,341, filed on Sep. 26, 2011.
Prior Publication US 2015/0023456 A1, Jan. 22, 2015
This patent is subject to a terminal disclaimer.
Int. Cl. H04L 1/20 (2006.01); H04L 1/00 (2006.01); H04B 1/00 (2006.01); H04B 1/16 (2006.01); H03C 3/40 (2006.01); H03D 3/00 (2006.01); H03D 7/16 (2006.01); H04B 1/30 (2006.01); H04L 27/38 (2006.01); H04B 1/28 (2006.01); H04B 1/10 (2006.01)
CPC H04L 1/206 (2013.01) [H03C 3/406 (2013.01); H03D 3/009 (2013.01); H03D 7/168 (2013.01); H04B 1/0014 (2013.01); H04B 1/16 (2013.01); H04B 1/28 (2013.01); H04B 1/30 (2013.01); H04L 1/0036 (2013.01); H04L 1/203 (2013.01); H04L 1/208 (2013.01); H04L 27/38 (2013.01); H04L 27/3854 (2013.01); H04B 1/10 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A receiver system, comprising:
a radio antenna configured to receive a first modulated signal from a remote transmitter;
an I/Q demodulator configured to use a local oscillator to demodulate the first modulated signal to a first in-phase (“I”) receive signal and a first quadrature (“Q”) receive signal, the first modulated signal being previously modulated using a transmitter oscillator that is not synchronized with the local oscillator, the transmitter oscillator residing in the remote transmitter;
an I/Q signal adjuster configured to adaptively adjust the first I receive signal or the first Q receive signal based on one or more first control signals;
an I/Q modulator configured to modulate the first I and Q receive signals as adjusted to generate a first transitory receive signal;
a downstream demodulator configured to demodulate the first transitory receive signal; and
a transmitter circuit configured to transmit one or more second control signals to the I/Q signal adjuster, the one or more second controls signals being generated based on a value indicative of a signal-to-noise ratio (SNR) in the first transitory receive signal, the one or more second control signals being generated to adaptively adjust a second receive signal or a second Q receive signal to attempt to increase SNR in a second transitory receive signal generated by the I/Q modulator using the second I and Q receive signals as adjusted, the second I and Q receive signals being generated by the I/Q demodulator based on a second modulated signal received from the remote transmitter.