Codes for zero spectral density at zero frequency (Corresp.)

Pierobon, G.

doi:10.1109/tit.1984.1056858

Cited by 101 publications

(41 citation statements)

References 7 publications

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“…Presence of this null confirms that the sequence is balanced [12]. In contrast to depicting these results on linear scales as in Fig.…”

Section: Spectral Resultsmentioning

confidence: 74%

“…Note that h i (x) is independent of the source word; it depends only on the augmenting symbol sequence and the scrambling polynomial. DC-free sequences are characterised by a bounded running digital sum (RDS) [12] where RDS is the ongoing accumulation of encoded symbol values. In binary systems, the one-dimensional RDS is evaluated by assigning the value +1 to logic ones and −1 to logic zeros.…”

Section: Polynomials For Balanced Encodingmentioning

confidence: 99%

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Generation of balanced quadrature phase shift keyed sequences through guided scrambling

Fair

2015

IET Communications

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Balanced codes (also called DC-free codes) are widely used in binary communication systems to increase the likelihood of accurate symbol recovery with practical demodulators. Guided scrambling (GS) is recognised as a viable approach to efficiently generate DC-free binary sequences. In this study the authors extend the use of GS to generate balanced sequences of quadrature phase shift keyed (QPSK) symbols by using arithmetic from the ring of polynomials defined over the Galois field of four elements. In addition to ensuring adequate timing information and consistent decision thresholds to improve the performance of practical demodulators, balanced encoding of QPSK symbol sequences creates a null at DC in the spectrum of the equivalent complex baseband signal. This corresponds to a null at the centre frequency of the bandpass QPSK signal that enables the insertion of a pilot tone and avoidance of narrowband interference without filtering or distortion of the signal. The authors outline sufficient conditions for the generation of balanced GS QPSK sequences, and based upon these conditions the authors recommend scrambling polynomials and quotient selection criteria. The authors then present analytical and simulation results that confirm the generation of balanced sequences using this approach.

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“…Presence of this null confirms that the sequence is balanced [12]. In contrast to depicting these results on linear scales as in Fig.…”

Section: Spectral Resultsmentioning

confidence: 74%

Section: Polynomials For Balanced Encodingmentioning

confidence: 99%

Generation of balanced quadrature phase shift keyed sequences through guided scrambling

Fair

2015

IET Communications

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“…Table 7 presents some of the obtained spectral nulls permutation codebooks with their corresponding spectral nulls frequencies. It is clear from Table 7 and PSD figures that all our designed PAM codes are DC-free codes [19], which will overcome some communications problem like zero frequency components.…”

Section: Resultsmentioning

confidence: 91%

Permutation sequences and coded PAM signals with spectral nulls at rational submultiples of the symbol frequency

2010

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Coded PAM signals with spectral nulls at rational submultiples of the symbol frequency are presented. Spectral shaping using permutation symbols and distance-preserving mappings (DPMs) are two techniques presented in this paper to design codes with better error correction capability, which make them achieve a significant decoding gain compared to other published codes. The use of Viterbi decoding algorithm, gives these new codes an advantage with their property of no error propagation. The well shaped power spectral densities of these new codes may overcome some communications problem like zero frequency components.

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“…. }, xi E {-I, I}, as Pierobon [6] showed that a sequence is DC-free if, and only if, the RDS assumes a finite number of values. This number is called the Dzgztal Sum Variation (DSV), denoted by N .…”

Section: Preliminariesmentioning

confidence: 99%

On the low-frequency suppression performance of DC-free runlength-limited modulation codes

Braun¹,

Janssen

1996

IEEE Trans. Consumer Electron.

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Codes for zero spectral density at zero frequency (Corresp.)

Cited by 101 publications

References 7 publications

Generation of balanced quadrature phase shift keyed sequences through guided scrambling

Generation of balanced quadrature phase shift keyed sequences through guided scrambling

Permutation sequences and coded PAM signals with spectral nulls at rational submultiples of the symbol frequency

On the low-frequency suppression performance of DC-free runlength-limited modulation codes

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