Performance of an infrared wireless CDMA system

Fernando, Xavier

doi:10.1117/12.487335

Cited by 6 publications

(6 citation statements)

References 7 publications

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“…Here, P required is 1 mW. P fluorescent is obtained from (18) and P AWGN is obtained from (17). The SNR is changed by changing the received ambient light power P m .…”

Section: Simulation and Resultsmentioning

confidence: 99%

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Adaptive Denoising and Equalization of Infrared Wireless CDMA System

Fernando

Balendran

2005

J Wireless Com Network

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Infrared has abundant, unregulated bandwidth enabling rapid deployment at low cost. However, safety limits on power emission levels (IEC825), large noise due to ambient lighting, and multipath dispersion remain as hurdles in diffused indoor environments. Especially, the high-frequency periodic interference produced by fluorescent lights is a major concern. Spread spectrum techniques enable low-power operation and noise rejection, at the expense of large processing gain. In this paper, we quantify the noise received and propose an adaptive FIR filter to jointly cancel the multipath dispersion and the fluorescent light noise in an infrared CDMA system. From analytical and simulation results, the adaptive filter significantly enhances the noise rejection capability of the CDMA system and tracks well the quasistationary indoor wireless channel. Our results show tenfold improvement in the BER for a given SNR and processing gain due to the adaptive filter. The filter also performs well in the multiuser environment.

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“…Here, P required is 1 mW. P fluorescent is obtained from (18) and P AWGN is obtained from (17). The SNR is changed by changing the received ambient light power P m .…”

Section: Simulation and Resultsmentioning

confidence: 99%

“…IR-CDMA provides an attractive solution in this scenario because CDMA technique inherently enables low-power operation at an expense of reduced bit rate [17]. In [18], it has been shown that IR-CDMA using optical orthogonal codes (OOC) can operate at power levels well below ambient light power levels.…”

Section: Infrared Cdmamentioning

confidence: 99%

Adaptive Denoising and Equalization of Infrared Wireless CDMA System

Fernando

Balendran

2005

J Wireless Com Network

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“…This approach allows us to describe the characteristic of the wireless channel only within the wireless block. In this manner, we minimize the effort required to extend our implementation and support different protocol designs [4] [5]. Furthermore, our integration method allows the definition of multiple wireless channels, by instantiating and connecting different wireless components to the system hierarchy.…”

Section: A System Integrationmentioning

confidence: 99%

“…implementing faster and more efficient data connections leveraging technological breakthroughs, such as on-chip photonic links [3]. In this context, a promising avenue is that of nanointegrated wireless communication, which displays efficient data sharing with low-latency transfers [4] [5].…”

Section: Introductionmentioning

confidence: 99%

“…To analyze the different options at the system level, simulators are essential for enabling the fast assessment of configurations. To date, only applicationlevel simulators have been employed for evaluating wirelessenabled systems, such as Multi2Sim [4] [5]. These simulators only emulate the instructions related to the guest program, abstracting from the OS and virtualizing the system call interface.…”

Section: Introductionmentioning

confidence: 99%

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Full System Exploration of On-Chip Wireless Communication on Many-Core Architectures

Medina

Kein

Qureshi

et al. 2022

2022 IEEE 13th Latin America Symposium on Circuits and System (LASCAS)

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In order to develop sustainable and more powerful information technology (IT) infrastructures, the challenges posed by the "memory wall" are critical for the design of high-performance and high-efficiency many-core computing systems. In this context, recent advances in the integration of nano-antennas, enabling novel short-distance communication paradigms, promise disruptive gains. To gauge their potential benefit for the next-generation of many-core server designs, it is crucial to explore the impact of wireless communication links from a whole-system viewpoint, considering complex architectures and applications characteristics. To this end, in this work we introduce an extension to the popular gem5 full systemlevel simulator, enabling the simulation of many-core platforms featuring on-chip wireless channels. This new extension allows the flexible investigation of different combinations of wireless and wired interconnects, as well as diverse connection protocols. We showcase its capabilities by performing an architectural exploration, targeting a multi-core system executing image inference using an AlexNet Neural Network benchmark. A 2.3x speedup is obtained when implementing wireless communication between cores instead of traditional on-chip wired interconnects.

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