| 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 |
| 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.
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