A low-area based costas loop implementation for BPSK signals

Sushma, .; Venkataratnam,; Yellampalli, Siva

doi:10.1109/iceeccot.2017.8284664

Cited by 1 publication

(2 citation statements)

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“…1). The use of PLL and Costas Loop schemes are one of the most employed methods to track the phase of incoming signals without training sequences [11]. Although ML affords the best performance, its implementation is typically prohibitive due to the total number of multiplications, exponent arithmetic operations, and integration procedures.…”

Section: Related Workmentioning

confidence: 99%

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Adaptive Blind MPSK Constellation Recovery and Equalization for Cognitive Radio Applications

Marrero

Gómez

Dressler

et al. 2022

IEEE Trans. Veh. Technol.

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Cognitive radio (CR) is considered a relevant communication paradigm to deal with the increasing demands in modern communications systems. Adaptive schemes are required to recognize channel conditions and to properly adjust main transmission parameters to improve the quality of communications. In this direction, blind algorithms to recover constellation, from phase-modulated signals, represent a means to implement cognitive capabilities to allow automatic modulation recognition (AMR) on receivers. Commonly, the most popular approaches for blind constellation recovery are based on a two-step scheme. The first step uses to equalize channel effects and reduce inter-symbol interference (ISI). The second step carries out constellation recovery utilizing phase locked loop (PLL) systems like the Costas Loop, then to classify the incoming signal. This work proposes a novel single-step blind adaptive filter solution, inspired by an adaptive interference canceler, for joint equalization and constellation symbol recovery from received phase shift keying (PSK) waveforms. Furthermore, we propose new coefficients update mechanisms based on the constant amplitude of PSK signals. The proposed solution exhibits reduced computational complexity compared to the state of the art and a reduced time of convergence. Additionally, the proposed scheme does not require a training sequence to operate properly. The obtained results clearly show that the proposed scheme significantly improves accuracy regarding phase symbol estimation and ISI reduction.

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Section: Related Workmentioning

confidence: 99%

“…In the literature, reported methods to recover phase from PSK or QAM waveforms are mainly conceived through phase locked loop (PLL) like the Costas Loop [11]. These are also conceived with the inclusion of signal preprocessing methods like channel equalizers and filters to reduce the impact of noise and undesirable channel effects [7].…”

mentioning

confidence: 99%