Citation
Abstract
The tracking (mean-square timing-error) performance of a linearized datatransition tracking loop (LDTTL) is presented. The difference between the LDTTL and the conventional DTTL is that the hard-limiter nonlinearity in the conventional DTTL’s inphase arm is replaced by a linear device, as suggested by the maximum a posteriori (MAP) open-loop estimate of symbol timing at low symbol signal-to-noise ratio (SNR). The application of such a configuration is for errorcorrection-coded communication systems where current coding technology suggests symbol SNR values perhaps as low as −6 dB. The mean-square tracking jitter performances of the LDTTL and the conventional DTTL are compared over a wide range of symbol SNRs, with the former offering a noticeable advantage at low symbol SNRs.
Details
- Volume
- 42-162
- Published
- August 15, 2005
- Pages
- 1–10
- File Size
- 230.4 KB