Thursday, October 11, 2012

Adaptive Filtering with GNURADIO & USRP : Part-1

I have started working on a project which aims to cancel the echo generated at the WCDMA on-frequency repeater stations.

The project is supported by a telecom giant(cant mention the name here)

The project will mostly consist of adaptive filtering methods. I am trying to do something using GNURADIO and  USRP.

Aim of this project is to minimize the reverse coupling between the transmit and receive antennas of the on-frequency repeater. Mostly we will go with sub-band adaptive filtering techniques.

Details of the echo (which also sometimes called reverse coupling) problem in WCDMA repeaters can be found in there papers :

1. Adaptive Echo Cancellation for an On-Frequency RF Repeater using a Weighted Power Spectrum. R. Neil Braithwaite and Scott Carichner
Powerwave Technologies, Santa Ana, CA 92705 USA

2. Echo Cancellation for a Wide Bandwidth Mixed-mode WCDMA/GSM Repeater with Digital Sub-band Filtering R. Neil Braithwaite, Scott Carichner, and Mark Cope* Powerwave Technologies, Santa Ana, CA 92705 USA and (*) Bristol UK

3. The Repeater for WCDMA Cellular Mobile Telecommunication Systems
He Songbai, Wang Bin, You Fei, Yan Xiaohuan, Bao Jingfu School of Electronic Engineering, University of Electronic Science and Technology, Chengdu 610054, China E-mail:

4. The use of Constant Modulus Normalization for Digital Echo Cancellation within RF Repeaters , R. Neil Braithwaite Powerwave Technologies, Santa Ana, CA 92705 USA

5. Estimation and Compensation of Radiated Feedback Coupling in a High Gain Repeater Using Gain Dithering R. Neil Braithwaite Powerwave Technologies, Santa Ana, CA 92705 USA

6. Antenna Isolation Considerations in WCDMA Repeater Deployment Azah Syafiah Mohd Marzuki, Amir RazifAbd Rahim, Benyazwar Mohmd, Khaidir Khalil, Amran Naemat and Azlinda Tee

7. A New Low-Complex Interference Cancellation Scheme for WCDMA Indoor Repeaters Moohong Lee*, Byungjik Keum*, Yunmok Son*, Joo-Wan Kim†, and Hwang Soo Lee* * Korea Advanced Institute of Science and Technology / the School of EECS, Daejeon, Korea, † SK Telesys, Seongnam, Korea,

8. An Efficient Hardware Simulator for the Design of a WCDMA Interference Cancellation Repeater Moohong Lee, Byungjik Keum, Yunmok Son, and Hwang Soo Lee, Member, IEEE Division of Electrical Engineering of EECS KAIST, Daejeon 305-701, Korea , Ju Tae Song and Joo-Wan Kim, Member, IEEE R&D Center, SK Telesys Seongnam, Gyeonggi-Do 463-825, Korea

9. Feedback Interference Cancellation System for WCDMA Radio Repeater
Akkarawut Thepworachai and Chaiyod Pirak The Sirindhorn International Thai-German Graduate School of Engineering (TGGS) King Mongkut's University of Technology North Bangkok 1518 Pibulsongkram Road, Bangsue, Bangkok 10800, Thailand

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