The hardware used to implement the digital techniques discussed previously is the main focus of this chapter. We will first discuss digital signal processors (DSPs) and the functions they must perform. Next, two commercially available DSPs are described. Current high-performance VLSI architectures for signal processing are introduced including parallel processing, bit-serial processing, systoli...

This paper describes a coherent optical receiver, ELO. 1 ELO where drifts of the carrier phase and state of polarization are L E (2) estimated with digital signal processing. The complex amplitude LO,y 2 J jLO of the signal is entirely restored with such receiver. where ELO is the constant amplitude of LO. The 90' optical hybrids in Fig.1 generate electric fields E1. .8 at double balanced

With continuing progress in VLSI and ASIC technologies, digital signal processing (DSP) algorithms have continued to find great use in increasingly wide application areas. DSP has gained popularity also in embedded systems although these systems set challenging constraints for implementations. Embedded systems contain limited resources, thus embedded DSP systems must balance tradeoffs between t...