Abstract
In past years, Parallel Sequence Spread Spectrum (PSSS) has attracted significant attention as a modulation technique for wireless communication systems targeting data rates of 100 Gb/s and beyond. PSSS allows designing high-speed baseband processors, which can be partially implemented in the analog domain. It uses multiple analog-to-digital converters (ADCs) to sample the received baseband signal in parallel, significantly relaxing the sampling rate and ADC complexity. However, due to the sidelobe effects of bipolar <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$m$ </tex-math></inline-formula> -sequences, PSSS shows lower performance than standard digital modulation schemes. This paper proposes real-valued PSSS spreading sequences with attenuated autocorrelation sidelobes. Such sequences show excellent bit error rate (BER) performance. Moreover, our sequences do not have length restrictions of 2 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">m</sup> – 1, like in the case of <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$m$ </tex-math></inline-formula> -sequences, and reduce the chip area required to implement PSSS transceiver. The proposed sequences also reduce the peak-to-average power ratio (PAPR) of PSSS.
Highlights
AND MOTIVATIONThe increase of wireless data rates in the last decade drives the need for new baseband processing solutions for the generation of ultra-high-speed wireless communications targeting 100 Gbps and beyond
We prove that autocorrelation sidelobes cause the poor bit error rate (BER) performance
We search the codes in an application-oriented approach, because we focus on cyclicautocorrelation and peak-to-average power ratio (PAPR) properties, not standard linear autocorrelation
Summary
The increase of wireless data rates in the last decade drives the need for new baseband processing solutions for the generation of ultra-high-speed wireless communications targeting 100 Gbps and beyond. The main advantage of PSSS is a lightweight baseband implementation that allows to sample and process the baseband signal in parallel ADC structures and baseband threads (Fig. 2) [7] This feature is especially important for future high-speed wireless channels located in the THz band, where the ADCs and DACs need to process large bandwidth. L. Lopacinski et al.: Real-Valued Spreading Sequences for PSSS Based High-Speed Wireless Systems. The proposed genetic algorithm generates sequences with adjustable lengths ranging from 3 to 30 chips, which has not yet been demonstrated for PSSS in any paper. This allows designing PSSS transceivers with a more flexible hardware architecture.
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