FPGA implementation of a same-frequency cellular repeater using adaptive feedback cancellation

We have implemented a same-frequency cellular repeater that uses adaptive signal processing to cancel the feedback path, thereby allowing high gain while maintaining stability. Preliminary results are presented for a real-time laboratory demonstration using an FPGA development board, realizing cancellation of about 20 dB over a 10-MHz bandwidth.

[1]  A.A.M. Saleh,et al.  A Statistical Model for Indoor Multipath Propagation , 1987, IEEE J. Sel. Areas Commun..

[2]  S. Haykin,et al.  Adaptive Filter Theory , 1986 .

[3]  Sen M. Kuo,et al.  Active Noise Control Systems: Algorithms and DSP Implementations , 1996 .

[4]  Dennis R. Morgan,et al.  A same-frequency cellular repeater using adaptive feedback cancellation , 2012, 2012 IEEE Global Communications Conference (GLOBECOM).

[5]  H. H. Xia,et al.  Repeaters for CDMA systems , 1998, VTC '98. 48th IEEE Vehicular Technology Conference. Pathway to Global Wireless Revolution (Cat. No.98CH36151).

[6]  A.H. Ali,et al.  The performance of repeaters in UMTS networks , 2004, Proceedings of the 12th IEEE Mediterranean Electrotechnical Conference (IEEE Cat. No.04CH37521).