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Wireless Personal Communications, 2017
Nonlinear companding transform (NCT) is an efficient method to reduce the high peak-to-average power ratio (PAPR) of multicarrier transmission systems. However, the introduced companding noise severely restrains the bit-error-rate (BER) performance.
Siming Peng +4 more
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Nonlinear companding transform (NCT) is an efficient method to reduce the high peak-to-average power ratio (PAPR) of multicarrier transmission systems. However, the introduced companding noise severely restrains the bit-error-rate (BER) performance.
Siming Peng +4 more
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A homomorphic approach to companding
Proceedings of 1994 28th Asilomar Conference on Signals, Systems and Computers, 2002The procedure of first COMpressing and then exPANDing a signal is known as "companding". In pulse code modulation systems, commonly used in telephone switching networks, samples of an analog speech waveform are encoded as binary words and transmitted.
C.S. Lindquist, S.K. Mukherjee
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Instantaneously Companding Digital Signal Processors
2007 IEEE International Conference on Acoustics, Speech and Signal Processing - ICASSP '07, 2007We extend the technique of instantaneous companding (compressing and expanding) to digital signal processors (DSPs). Companding has been used for many years in non-dynamical channels, but the dynamical nature of DSPs causes output distortion in standard implementations of companding, where a compressor and expander are used at the input and output ...
Ari Klein, Yannis Tsividis
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On suboptimal multidimensional companding
Proceedings DCC '98 Data Compression Conference (Cat. No.98TB100225), 2002A vector quantizer (VQ) consisting of a nonlinear mapping (compressor), a lattice VQ, and the inverse of the compressor (expander) is considered. While it was previously pointed out that in dimensions k>2 except for linear transformations and translations only reflections through reciprocal radii can preserve optimality in terms of the lattice cells ...
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Digital signal processing syllabic compander
Electronics and Communications in Japan (Part I: Communications), 1985AbstractAt present, analog circuits are used widely for syllabic companding which effectively improves the quality of speech communication. The digitalization of the syllabic companding circuit promises several advantages, namely, the possibility of adapting filter coefficients to the condition of the radio communication system, the elimination of ...
Jun Tajima, Katsumi Kobayashi
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Series Solutions of Companding Problems
Bell System Technical Journal, 1983A formal power series solution (i) x(t) = Σ 1 ∞ mk x k (t) is given for the companding problem (ii) Bf{x(t)} = my(t), B{x(t)} = x(t), where B is the bandlimiting operator defined by Bg = (Bg)(t) = ∫ g(s)[sin λ(t − s)]/[π(t − s)]ds and f(t) has a Taylor series with f(0) = 0, f′(0) ≠ 0. Expressions for the x k are given in terms of the coefficients of f,
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