Jitter Induced Symbol Slip rates in Next-Generation Ground Segment Receivers

Measurement techniques for transmit source clock jitter for weak serial RF links

“…Faster sampling helps, but even with hundreds of samples per cycle a slow beat can be significant. However, while these waveshapes can have an intimidating peak-to-peak their contribution to the rms measurements recommended in [4] is much smaller.…”

“…The E b /N 0 thresholds supported by these codes are approaching the Shannon Limit, and because of parity overhead the receiver's symbol synchronizer must function in an even lower E s /N 0 environment. [1,2,3] To open up a solution-space for the symbol synchronizer (including at the minimum a tighter loop filter), certain characteristics of transmit data modulation jitter must be controlled [4]. These include rapid phase jitter and slow cycle-to-cycle jitter, which cause symbol error rate degradation in the untracked and tracked frequency bands, respectively.…”

Closed-loop analysis of soft decisions for serial links

“…And of course an instrument that can detect slips, rotations, and glitches, can also collect statistics on the distribution of these events in a given scenario. [6] IV. SOFT DECISION HISTOGRAMS A receiver has the task of estimating the ideal signal from a noisy and distorted copy of a non-ideal transmission.…”

“…[6] This data would not otherwise have been feasible to collect, and it lead to a new understanding of how to model the effects of jitter. [7] The histograms can be analyzed in other ways as well.…”