A Case Study on Fully Asynchronous ACS Module of Low-power Viterbi Decoder for Digital Wireless Communication Applications

: A Linear Feedback Shift Register (LFSR) considers a linear function typically an XOR operation of the previous state as an input to the current state. This paper describes in detail the recent Wireless Communication Systems (WCS) and techniques related to LFSR. Cryptographic methods and reconfigurable computing are two different applications used in the proposed shift register with improved speed and decreased power consumption. Comparing with the existing individual applications, the proposed shift register obtained >15 to <=45% of decreased power consumption with 30% of reduced coverage area. Hence this proposed low power high speed LFSR design suits for various low power high speed applications, for example wireless communication. The entire design architecture is simulated and verified in VHDL language. To synthesis a standard cell library of 0.7um CMOS is used. A custom design tool has been developed for measuring the power. From the results, it is obtained that the cryptographic efficiency is improved regarding time and complexity comparing with the existing algorithms. Hence, the proposed LFSR architecture can be used for any wireless applications due to parallel processing, multiple access and cryptographic methods.

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Characterizing the Impact of Doppler Effects on Body-Centric LoRa Links with SDR

Sensors ◽

10.3390/s21124049 ◽

2021 ◽

Vol 21 (12) ◽

pp. 4049

Author(s):

Thomas Ameloot ◽

Marc Moeneclaey ◽

Patrick Van Van Torre ◽

Hendrik Rogier

Keyword(s):

Wireless Communication ◽

Low Power ◽

Multipath Fading ◽

Doppler Spread ◽

Excellent Performance ◽

Wireless Applications ◽

Doppler Shifts ◽

Doppler Effects ◽

The Impact ◽

Measurement Campaigns

Long-range, low-power wireless technologies such as LoRa have been shown to exhibit excellent performance when applied in body-centric wireless applications. However, the robustness of LoRa technology to Doppler spread has recently been called into question by a number of researchers. This paper evaluates the impact of static and dynamic Doppler shifts on a simulated LoRa symbol detector and two types of simulated LoRa receivers. The results are interpreted specifically for body-centric applications and confirm that, in most application environments, pure Doppler effects are unlikely to severely disrupt wireless communication, confirming previous research, which stated that the link deteriorations observed in a number of practical LoRa measurement campaigns would mainly be caused by multipath fading effects. Yet, dynamic Doppler shifts, which occur as a result of the relative acceleration between communicating nodes, are also shown to contribute to link degradation. This is especially so for higher LoRa spreading factors and larger packet sizes.

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Case study: To identify the students that participating in the Cheer activity of the Faculty of Engineering, KMITL by using Near Field Wireless communication

2020 5th International STEM Education Conference (iSTEM-Ed) ◽

10.1109/istem-ed50324.2020.9332654 ◽

2020 ◽

Author(s):

Paisan Sithiyopasakul ◽

Boonchana Purahong ◽

Saran Sithiyopasakul ◽

Tuanjai Archevapanich

Keyword(s):

Wireless Communication ◽

Near Field

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