Joint timing recovery and turbo equalization for partial response channels
A.R. Nayak, J.R. Barry, S.W. Mclaughlin · 2003
Summary form only given We propose an iterative scheme for jointly performing timing recovery and turbo equalization that embeds the timing recovery process inside a modified turbo equalizer. The proposed scheme is applied where a rate- 1/4 RSC encoder, an s-random interleaver, and a 1/(I /spl oplus/ D/sup 2/) precoder map blocks of 1278 bits to blocks of 5120 symbols a/sub k/ /spl isin/ {/spl plusmn/1}, which then drive a perfect PR4 pulse shape h(t) = p(t) - p(t - 2T), where p(t) = sin(/spl pi/t/1)/(/spl pi/t/7). A random-walk model is used for the timing jitter, whereby the k-th pulse is delayed by /spl tau//sub k/, and /spl tau//sub k+1/ = /spl tau//sub k/ + /spl Nscr/(0, /spl sigma//sub w//sup 2/). The channel adds white Gaussian noise.