Phd thesis dsp
Another application of the proposed algorithms is the design of filters with low group delay in the passbands. In this respect, an evolution towards Elastic Optical Networks EONs has emerged as a cost-effective, flexible and dynamic solution, to face the new claims.
Iit kanpur signal processing
Owing to the unique time-frequency properties of chirped waveforms, OCDM outperforms OFDM and single-carrier systems, and is more resilient against the noise effect, especially, when time-domain and frequency-domain distortions are severe. Including the principles of Software Defined Network SDN paradigm further flexibility and adaptability can be achieved. The main idea is the efficient utilization of the optical spectrum by combining flexible transceivers, flexi-grid and flexible optical switching. This and the fact that this thesis includes Matlab programs implementing all proposed algorithms makes all results of this dissertation directly applicable to many practical design problems. It is able to dynamically tune the optical bandwidth or bit rate changing parameters such as the modulation format, bandwidth, among others, to find a trade-off between transmission reach and spectral efficiency, serving multiples destinations. Apart from adaptive, flexible and programmable transceivers, metro optical networks have to be equipped with flexible optical switching systems at the node level. Their passband group delay is usually considerably smaller than the delay of linear phase FIR filters with equivalent magnitude responses. Thus, the deployed infrastructure is more efficiently exploited since the quadrature and the polarization dimensions are used to transmit the signal. Another application of the proposed algorithms is the design of filters with low group delay in the passbands. Then, we evaluate the system for a realistic optical metro network.
The second one is about Fresnel transform with the derivation of an interesting discrete Fresnel transform DFnTand the proposal of orthogonal chirp-division multiplexing OCDMwhich is fundamentally underlain by the Fresnel transform. Meeting a required minimum stopband attenuation or a maximum deviation from the desired magnitude and phase responses in the passbands are common design constraints that can be handled by the methods proposed here.
Its properties are proved. SOAs can be conveniently used for optical switching in metro networks because of their low cost or low power consumption, among others relevant characteristics.
Graph signal processing
Literally, it contributes two principal enforcements with respect to information communication. For the design of IIR filters, an important constraint is the prescription of a maximum pole radius. Another application of the proposed algorithms is the design of filters with low group delay in the passbands. Its properties are proved. The system has been experimentally analyzed with and without considering filtering elements. An algorithm solving this constrained IIR design problem is presented. Digital signal processing for fiber-optic communication systems. In the FIR case, the exactly linear phase property is given up in order to reduce the delay while maintaining a good approximation to phase linearity in the passbands.
During the development of the proposed design techniques special emphasis has been placed on their computational efficiency. All Matlab files used in the thesis can be downloaded here.
In particular, we focus on the theoretical model of an advanced transmission technique based on OFDM technology with DD. One of the attractive properties, the convolution-preservation property states that the DFnT of a circular convolution of two sequences is equal to the DFnT of either one convolving with the other.
This and the fact that this thesis includes Matlab programs implementing all proposed algorithms makes all results of this dissertation directly applicable to many practical design problems.
In the first part, equalization and signal recovery problems result from the halved subcarrier spacing in both double-sideband DSB and single-sideband SSB modulated Fast-OFDM systems are studied, respectively.
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