Title :
Low-complexity optimal symmetric interpolation filters for SDR receivers
Author :
Vo, Nguyen Doan ; Le-Ngoc, Tho
Author_Institution :
Dept. of ECE, McGill Univ., Montreal, Que., Canada
Abstract :
A modified Farrow structure for the second-order polynomial, symmetric interpolator suitable for low-complexity hardware implementation is presented. The significant reduction in complexity of the modified structure allows a faster and simpler implementation, and a better interpolation performance with longer filters. The optimum filter coefficients are derived by using a proposed cost function that takes into consideration the desired time and frequency responses as well as the symbol timing error, suitable for practical design objectives. A vector form of the cost function is derived to allow the use of fast optimization algorithm. Illustrative design examples for flexible digital receivers are presented. Simulation results show a superior performance of the proposed low-complexity interpolation filters.
Keywords :
digital filters; frequency response; interpolation; optimisation; radio receivers; software radio; synchronisation; SDR receiver; all-digital timing recovery; cost function; digital receivers; fast optimization algorithm; fractional delay; frequency response; interpolation filters; optimum filter coefficient; second-order polynomial; software-defined radio; symbol timing error; time response; Clocks; Cost function; Equations; Filters; Frequency; Hardware; Interpolation; Polynomials; Signal sampling; Timing;
Conference_Titel :
Electrical and Computer Engineering, 2003. IEEE CCECE 2003. Canadian Conference on
Print_ISBN :
0-7803-7781-8
DOI :
10.1109/CCECE.2003.1226297
