Serial concatenation of block and convolutional codes - Electronics Letters

Measures: The results of the previous Figures have been obtained on an emittingkeceiving 4-IPPM 2Mbit/s circuit prototype. A standard PPM codifier is added to a pulse conformation block that takes eight samples stored in a look-up table to give the form to the pulse. It has been implemented on an FPGA ALTERA EPM 5064 JC-1. The D/A is a simple and inexpensive DAC08. As the optical emitter we use a Siemens SFH 477 IRED with an analogue driver. As the receiver we used a Hamamatsu C5331 APD. The decissor is a block maximum likelihood one.