David R Love

US Patent:

7848713, Dec 7, 2010

Filed:

Sep 28, 2007

Appl. No.:

11/864338

Inventors:

Jose Cabanillas - San Diego CA, US
Prasad S. Gudem - San Diego CA, US
Sai Chong Kwok - Escondido CA, US
David Love - San Diego CA, US

Assignee:

QUALCOMM Incorporated - San Diego CA

International Classification:

H04B 1/46

US Classification:

455 83, 455 78, 455 82, 4552481, 343861

Abstract:

Techniques for attenuating undesired signal components from a differential duplexer are described. The duplexer provides a differential received signal at RX+ and RX− ports. This differential received signal includes an undesired common mode signal, which may come from a transmit signal. The common mode signal is attenuated with a common mode trap in an impedance matching network coupled to the RX+ and RX− ports. The matching network includes a first passive circuit coupled between the RX+ port and a first node, a second passive circuit coupled between the RX− port and a second node, and the common mode trap coupled between the first and second nodes. In one design, the common mode trap includes a first inductor coupled between the first node and a common node, a second inductor coupled between the second node and the common node, and a capacitor coupled between the common node and circuit ground.

US Patent:

20140003274, Jan 2, 2014

Filed:

Mar 19, 2012

Appl. No.:

14/005456

Inventors:

Bruno Clerckx - Seoul, KR
Duck Dong Hwang - Yongin-si, KR
Chun Kin Au Yeung - San Diego CA, US
David James Love - West Lafayette IN, US
Tae Joon Kim - West Lafayette IN, US

Assignee:

Samsung Electronics Co., Ltd. - Suwon-si, Gyeonggi-do

International Classification:

H04J 11/00

US Classification:

370252

Abstract:

The present invention relates to a method and apparatus for interference alignment in a wireless communication system. A method in which a terminal aligns interferences in a wireless communication system, which includes a first base station governing a first cell and a second base station governing a second cell, comprises: a step in which the terminal measures a serving channel from the first base station which is a serving base station and an interference channel from the second base station; a step of transmitting null space information orthogonal to the interference channel to the first base station; a step of measuring channels from the first base station and the second base station to which an inference alignment plane generated based on the null space information is applied, and generating a receiving filter; and a step of transmitting, to the first base station, the interference alignment plane, the receiving filter, and effective channel measurement value based on the channel from the first base station.