US 9,814,053 B2
Remote radio head unit system with wideband power amplifier
Chengxun Wang, Shenzhen (CN); and Shawn Patrick Stapleton, Burnaby (CA)
Assigned to Dali Systems Co. Ltd., George Town (KY)
Filed by Dali Systems Co. Ltd., George Town, Grand Cayman (KY)
Filed on Jun. 30, 2015, as Appl. No. 14/754,908.
Application 14/754,908 is a continuation of application No. 14/248,597, filed on Apr. 9, 2014, granted, now 9,106,453.
Application 14/248,597 is a continuation of application No. 12/928,933, filed on Dec. 21, 2010, granted, now 8,730,786, issued on May 20, 2014.
Claims priority of provisional application 61/288,840, filed on Dec. 21, 2009.
Prior Publication US 2015/0382363 A1, Dec. 31, 2015
Int. Cl. H04W 4/00 (2009.01); H04W 72/08 (2009.01); H04W 24/02 (2009.01); H04W 72/04 (2009.01); H03F 1/02 (2006.01); H03F 3/19 (2006.01); H03F 3/24 (2006.01); H03F 3/72 (2006.01); H04B 1/12 (2006.01); H04B 1/525 (2015.01)
CPC H04W 72/082 (2013.01) [H03F 1/0277 (2013.01); H03F 3/19 (2013.01); H03F 3/245 (2013.01); H03F 3/72 (2013.01); H04B 1/123 (2013.01); H04B 1/525 (2013.01); H04W 24/02 (2013.01); H04W 72/0446 (2013.01); H03F 2200/111 (2013.01); H03F 2200/294 (2013.01); H03F 2200/321 (2013.01); H03F 2203/7209 (2013.01)] 19 Claims
OG exemplary drawing
 
1. An interference mitigation system for improving isolation between transmitters and receivers in wireless communications systems comprising:
a power amplifier operable to receive and amplify a received signal at a predetermined frequency to provide a transmit signal;
a feedback coupler coupled to the power amplifier and operable to provide a feedback signal based on the transmit signal, wherein a characteristic of the feedback signal is representative of a characteristic of the transmit signal;
an interference cancellation unit coupled to the feedback coupler and operable to generate a processed signal;
a circulator coupled to the power amplifier;
an antenna coupled to the circulator and operable to broadcast the transmit signal at the predetermined frequency and to receive an intake signal at the predetermined frequency;
a combiner that is operable to combine the processed signal with the intake signal from the antenna to generate a combined signal; and
a low noise amplifier coupled to the combiner and operable to receive the combined signal.