Joint timing recovery and turbo equalization for partial response channels

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.