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- W2547570260 abstract "The wide range of potential applications of time-frequency (t, f) methods made them an important tool in most fields of science and engineering. A large number of approaches exist, depending on the application considered. Key (t, f) methodologies are presented on specific applications in this Part V of the book and illustrated using selected examples. Telecommunications is one of the key industries where (t, f) methods are already playing an important role. The topic is represented by five sections selected for this chapter, complemented by other sections in other chapters such as Sections 8.5 and 11.3. Due to possible hostile jamming, broadband communication platforms use spread spectrum technology where interference protection is achieved by interference excision. By distributing the signature of received data over a (t, f) region, it is possible to attenuate strong interferences (Section 13.1). Linear dispersion in wireless communication channels distorts the transmitted signal in both time and frequency. This is accounted for by a (t, f) scattering function. In wireless communication systems with Code Division Multiple Access (CDMA) protocol, fading and multiaccess interference can be dealt with using time-frequency processing. A (t, f) RAKE receiver is described which implements correlations in a (t, f) domain and accounts for both spectral and temporal channel variations resulting from the use of spread spectrum techniques (Section 13.2). Eigenfunctions of linear systems can be modeled by signals with a (t, f) distribution well localized in the (t, f) plane. The knowledge of the eigenfunctions of time-varying transfer functions allows optimizing the transmission strategy to take advantage of the channel dispersive properties (Section 13.3). Detection and parameter estimation of chirps in communication systems may be implemented using the fractional Fourier transform (Section 13.4). The last section focuses on the (t, f) estimation of radio-signal modulation parameters and includes a discussion on cognitive radio, quality of service and communication channels from a (t, f) perspective (Section 13.5)." @default.
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- W2547570260 date "2016-01-01" @default.
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- W2547570260 title "Time-Frequency Methods in Communications" @default.
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