Tamed frequency modulation detection analysis with NEC receivers

Barbounakis, Ioannis S.; Stavroulakis, Peter; Gardiner, J.G.

doi:10.1049/ip-com:20000364

Cited by 2 publications

(3 citation statements)

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“…Correlative Encoded CPM is a subclass of the CPM whose input data are correlated over some signalling intervals before entering the modulator [7]. Among the signals of this class, those that are treated here, are Tamed Frequency Modulation [18]- [19], Duobinary…”

Section: Aim Of the Studymentioning

confidence: 99%

“…As a result, the transmitted symbols are now dependent on their adjacent ones at some degree exactly proportional to the correlation length. TFM is the only modulation of the three that has not attracted the attention of the telecommunications community with few exceptions [7], [19], [23], although, it is one of the best-suited modulations for practical applications that require high spectral efficiency and low enough out-of-band radiation levels [Appendix A].…”

Section: Aim Of the Studymentioning

confidence: 99%

“…The proposed NEC receiver employs differential detectors of orders L>1 in order to be able to correct up to (L-l) errors. Although, NEC has been successfully deployed with phase/frequency modulations such as MPSK [15], MSK [8] and binary/nonbinary correlative modulations [19], [21], it has never been used with amplitude-phase modulations such as QAM. Having amplitude and phase independence makes star QAM the perfect candidate for the differential encoding and detection approach to be followed.…”

Section: Digital Transmission Techniques In Mobile Systemsmentioning

confidence: 99%

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Error correction techniques for the general class of correlative encoded continuous phase modulation signals (CECPM)

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Nonredundant Error Correction (NEC) is a convolutional-code-equivalent error correction technique. Like any other correction technique, it depends on extra parity-like data transmitted along with the source data. Unlike any other technique, however, neither any modification is required at the transmitter nor any adjustment of the channel bandwidth is required to accommodate an increased bit rate. NEC operates through the employment of multiple differential detectors at the receiver in order to extract the parity information, which resides within the source data. Based on this parity information, it applies some syndrome rules to check if any errors exist among the received data. It has been proved to operate well not only under additive white gaussian noise but also under Intersymbol Interference and Cochannel Interference contaminated environments. Correlative Encoded Continuous Phase Modulation (CECPM) is a general class of signals characterised by their constant envelope, small bandwidth occupancy and the substantially small out-of-band radiation. Among the main representatives of this class of signals, there are Tamed Frequency Modulation, Duobinary Coded Minimum Shift Keying and Duoquaternary Frequency Shift Keying. With correlation length extending over two or three symbol periods and symbols being either binary or quaternary, these modulations are theoretically analysed together with NEC under additive white gaussian noise conditions. Additionally, Quadrature Amplitude Modulation (star-QAM) although not a member of the CECPM class of signals, is also proposed with NEC and is simulated under AWGN and/or Rayleigh fading. Monte Carlo simulation results prove the correctness of the theory, that single and double errors can be detected and corrected. They also prove that the proposed error correction technique is useful even to signals whose data symbols are not independent with each other. The evaluation results indicate significant performance improvements over "conventional" differential detection.

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Section: Aim Of the Studymentioning

confidence: 99%