Shaping Spectral Leakage: A Novel Low-Complexity Transceiver Architecture for Cognitive Radio

Bala, Erdem; Li, Jialing; Yang, Rui

doi:10.1109/mvt.2013.2269178

Cited by 55 publications

(46 citation statements)

References 13 publications

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“…Therefore, to address the drawbacks of OFDM and enable the aforementioned characteristics, different physical-layer waveforms are being investigated for 5G networks. The waveforms currently under consideration include filtered orthogonal frequency division multiplexing (FOFDM) [4], windowed orthogonal frequency division multiplexing (WOFDM) [5], filterbank multicarrier (FBMC) [6], generalized frequency division multiplexing (GFDM) [7] and universal filtered multicarrier (UFMC) [2]. These waveforms are being investigated to analyse their impacts on the following fundamental requirements of 5G [8]:…”

Section: Wireless Regional Area Network (Wran)mentioning

confidence: 99%

Analysis of Candidate Waveforms for 5G Cellular Systems

Ijaz¹,

Zhang²,

Xiao³

et al. 2016

Towards 5G Wireless Networks - A Physical Layer Perspective

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Choice of a suitable waveform is a key factor in the design of 5G physical layer. New waveform/s must be capable of supporting a greater density of users, higher data throughput and should provide more efficient utilization of available spectrum to support 5G vision of "everything everywhere and always connected" with "perception of infinite capacity". Although orthogonal frequency division multiplexing (OFDM) has been adopted as the transmission waveform in wired and wireless systems for years, it has several limitations that make it unsuitable for use in future 5G air interface. In this chapter, we investigate and analyse alternative waveforms that are promising candidate solutions to address the challenges of diverse applications and scenarios in 5G.

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Section: Wireless Regional Area Network (Wran)mentioning

confidence: 99%

Analysis of Candidate Waveforms for 5G Cellular Systems

Ijaz¹,

Zhang²,

Xiao³

et al. 2016

Towards 5G Wireless Networks - A Physical Layer Perspective

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“…The second, proposed by Bala et al [28], is based on a raised cosine function, denoted here as p 2 : 7 …”

Section: Pulse Shapingmentioning

confidence: 99%

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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“…The first is present in the IEEE 802.11a standard. The second is based on a raised cosine function proposed by Bala et al [13]. The last is based on the characteristics of functions with vestigial symmetry presented by Castanheira and Gameiro [14].…”

Section: Using Pulse Shaping For 80211pmentioning

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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Shaping Spectral Leakage: A Novel Low-Complexity Transceiver Architecture for Cognitive Radio

Cited by 55 publications

References 13 publications

Analysis of Candidate Waveforms for 5G Cellular Systems

Analysis of Candidate Waveforms for 5G Cellular Systems

Spectrally efficient emission mask shaping for OFDM cognitive radios

Shaping Spectral Leakage for IEEE 802.11p Vehicular Communications

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