Power Efficient SDR Implementation of IEEE 802.11a/p Physical Layer

Iacono, D. Lo; Cupaiuolo, Teo

doi:10.1007/s11265-013-0773-z

Cited by 2 publications

(4 citation statements)

References 8 publications

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“…Shaping the 802.11p spectrum in order to reduce leakage and thus ICI is therefore important. Thanks to the similarities between the two PHYs, some researchers have focused on adapting 802.11a PHY devices for 802.11p [7,8,2]. The transformation is typically accomplished in four parts, namely, reducing channel bandwidth, channel estimation, satisfying transmission power requirements, and ensuring effective channel access performance.…”

Section: 11p Physical Layermentioning

confidence: 99%

“…The transformation is typically accomplished in four parts, namely, reducing channel bandwidth, channel estimation, satisfying transmission power requirements, and ensuring effective channel access performance. Due to a dearth of affordable 802.11p prototype hardware, existing wireless testbeds for 802.11p tend to use modified 802.11a implementations [7]. For example, Almeda and Matos present a front-end using 802.11a hardware that is targeted to comply with the specification of 802.11p [9].…”

Section: 11p Physical Layermentioning

confidence: 99%

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Spectrally efficient emission mask shaping for OFDM cognitive radios

Pham

Fahmy

McLoughlin

2016

Digital Signal Processing

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Orthogonal Frequency Division Multiplexing has been widely adopted in recent years due to its inherent spectral efficiency and robustness to impulsive noise and fading. For cognitive radio applications in particular, it can enable flexible and agile spectrum allocation, yet suffers from spectral leakage in the form of large side lobes, leading to inter-channel interference, unless mitigated carefully. Hence, recent OFDM-based standards such as 802.11p for vehicular communication and 802.11af for TV whitespace impose strict spectrum emission mask limits to combat adjacent channel interference. Stricter masks allow channels to operate closer together, improving spectral efficiency at the cost of implementation difficulty. Meeting the strict limits is a significant challenge for implementing both 802.11p and 802.11af, yet remains an important requirement for enabling cost-effective systems. This paper proposes a novel method that embeds baseband filtering within a cognitive radio architecture to meet the specification for the most stringent 802.11p and 802.11af masks, while allowing ten 802.11af sub-carriers to occupy a single basic channel without violating SEM specifications. The proposed method, performed at baseband, relaxes otherwise strict RF filter requirements, allowing the RF subsystem to be implemented using much less stringent 802.11a designs, allowing cost reductions.

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Section: 11p Physical Layermentioning

confidence: 99%

Section: 11p Physical Layermentioning

confidence: 99%

Spectrally efficient emission mask shaping for OFDM cognitive radios

Pham

Fahmy

McLoughlin

2016

Digital Signal Processing

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“…Thanks to the similarities between the two PHYs, some work has focused on making 802.11a PHY devices compatible with 802.11p [5], [6], [2]. Most researchers deal with the transformation in four parts, namely, reducing channel bandwidth, channel estimation, transmission power requirements, and effective channel access performance.…”

Section: Introductionmentioning

confidence: 99%

“…Most researchers deal with the transformation in four parts, namely, reducing channel bandwidth, channel estimation, transmission power requirements, and effective channel access performance. Due to a dearth of affordable 802.11p prototype hardware, existing wireless testbeds for 802.11p tend to use modified commercial offthe-shelf (COTS) 802.11a hardware [5]. For example, Almeda and Matos present a front-end using 802.11a hardware that is targeted to comply with the specification of 802.11p [7].…”

Section: Introductionmentioning

confidence: 99%

Shaping Spectral Leakage for IEEE 802.11p Vehicular Communications

Pham

McLoughlin

Fahmy

2014

2014 IEEE 79th Vehicular Technology Conference (VTC Spring)

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Abstract-IEEE 802.11p is a recently defined standard for the physical (PHY) and medium access control (MAC) layers for Dedicated Short-Range Communications. Four Spectrum Emission Masks (SEMs) are specified in 802.11p that are much more stringent than those for current 802.11 systems. In addition, the guard interval in 802.11p has been lengthened by reducing the bandwidth to support vehicular communication (VC) channels, and this results in a narrowing of the frequency guard. This raises a significant challenge for filtering the spectrum of 802.11p signals to meet the specifications of the SEMs. We investigate state of the art pulse shaping and filtering techniques for 802.11p, before proposing a new method of shaping the 802.11p spectral leakage to meet the most stringent, class D, SEM specification. The proposed method, performed at baseband to relax the strict constraints of the radio frequency (RF) front-end, allows 802.11p systems to be implemented using commercial off-theshelf (COTS) 802.11a RF hardware, resulting in reduced total system cost.

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Power Efficient SDR Implementation of IEEE 802.11a/p Physical Layer

Cited by 2 publications

References 8 publications

Spectrally efficient emission mask shaping for OFDM cognitive radios

Spectrally efficient emission mask shaping for OFDM cognitive radios

Shaping Spectral Leakage for IEEE 802.11p Vehicular Communications

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