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Pulse Shapes with Reduced Interference via Optimal Band-Limited Functions

Pulse Shapes with Reduced Interference via Optimal Band-Limited Functions

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In this chapter, we focus on the design of pulse shapes for orthogonal frequency division multiplexing (OFDM) systems. As pointed out above, in such systems, mutual orthogonality of the subcarriers alone is not sufficient to ensure ICI-free communications. Thus, recent research effort has been directed towards the design of pulse shapes that possess various other characteristics that are necessary for reliable communication in practical settings. In [3] for instance, soft iterative ICI cancellation in conjunction with pulse shaping has been proposed for low-complexity channel equalization in OFDM systems. Observing that a nearly flat spectral main-lobe generally results in a higher average signal power, and rapid side-lobe attenuation helps contain the magnitude of interference, pulse shapes with such properties have been introduced in [4-7].

Inspec keywords: iterative methods; pulse shaping; adjacent channel interference; equalisers; OFDM modulation; interference suppression; telecommunication network reliability

Other keywords: optimal band-limited functions; ICI-free communications; orthogonal frequency division multiplexing; nearly-flat spectral main-lobe; side-lobe attenuation; pulse shape design; communication reliability; OFDM systems; interference reduction; soft iterative ICI cancellation; low-complexity channel equalization; subcarrier mutual orthogonality

Subjects: Electromagnetic compatibility and interference; Reliability; Interpolation and function approximation (numerical analysis); Modulation and coding methods; Communication channel equalisation and identification

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