Slot timing recovery in a direct-detection optical PPM communication system can be
achieved by processing the photodetector output waveform with a nonlinear device whose …

A technique for word timing recovery in a direct detection optical pulse position modulation
(PPM) communication system is described. It tracks on back-to-back pulse pairs in the …

A new method is presented to perform bit synchronization and detection of binary nonreturn-
to-zero (NRZ) data from a free-space optical (FSO) communication link. Based on the …

Thedevelopment of a highdata-rate communications electronics subsystem for future
application in free-space, directdetection laser communications is described. The …

A clock recovery scheme for direct-detection optical on-off keying (OOK) communication
systems with nonreturn-to-zero pulse shaping is proposed and investigated. In the …

The authors present a purely digital timing recovery scheme for optical OOK receivers, which
offers the advantages of low hardware complexity and low jitter. In this technique, the …

Dicode pulse position modulation (DiPPM) has been postulated as a coding scheme that
appears to be more efficient than some of previous coding techniques. Previous publications …

Very high bit rates (multigigabit per second) are being increasingly used on direct detection
optical systems. The influence of clock recovery circuit (CRC) inaccuracies is of special …

Perfonrance of coded M-ary Pulse Position Modulation (M-PPM) systems in the presence of
slot synchronization errors is evaluated for the shot-noiselinr. tcd photon-counting receiver …

The power spectral density (PSD) of a direct-detected optical signal with overlapping pulse-
position modulation (OPPM) scheme is derived. It is demonstrated that this spectrum …