Digital Signal Processing

Ravinder Kaur ¹, Ashish Raman ², Hardev Singh ², Jagjit Malhotra ¹

Affiliations
1 DAV Institute of Engineering & Technology, Jalandhar, IN
2 Dr. B.R. Ambedkar National Institute of Technology, Jalandhar, IN

Abstract

Distributed Arithmetic (DA) is a high speed multiplication technique used for implementation of digital filters. The complicated multiplication-accumulation operation is converted to the shifting and adding operation when the DA algorithm is directly applied to realize FIR filter. In this paper the distributed arithmetic based design scheme for non recursive DSP systems requiring high speed computing is designed. Implementation for FPGAs has been done on Spartan 3E series FPGA, target device (XC3S500E) from Xilinx. A significant decline in delay is reported for an FIR filters from 8.188ns to 4.778ns using DA algorithm.

Keywords

Distributed Arithmetic (DA), Finite Impulse Response (FIR), Field Programmable Gate Array (FPGA).

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Anurag Sharma ¹, Jagjit Malhotra ²

Affiliations
1 DAV Institute of Engineering & Technology, Jalandhar, Punjab, IN
2 DAV Institute of Engineering & Technology, Jalandhar, Punjab, IN

Abstract

In this paper the designing of multichannel, high speed DWDM OADM optical ring network for six nodes,16 wavelengths having channel spacing 0.4 nm on unidirectional non linear single mode fiber of 10 Gbps has been reported. The performance optimization of the system by comparing different modulation formats i.e. NRZ, RZ, CRZ and DPSK is also reported on the basis of eye diagram, BER and Q²dB.It is reported that CRZ modulation format can achieve BER of e-27 and Q factor in the range of 20.3 which is gives best performance as comparison with rest of the modulation formats.

Keywords

CRZ, DPSK, DWDM, NRZ, EDFA, LEAF, OADM.

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