Numerical word-length optimization for CDMA demodulator

This paper presents search methods to optimize word-length for digital systems. Finding the word-length is tedious work when the variables for optimization are numerous. We have proposed sequential and preplanned searches to find optimum word-length, and compared them in terms of the trials. A comparison for a given optimized point is evaluated. We apply them to word-length optimization for a CDMA demodulator, of which requirement is FER of 0.03. Our results show the sequential and the preplanned search have reduced the trials by the rate of 64% and 89%, respectively compared to a full search to optimize the word-length for the CDMA demodulator design.