Making the Best out of Spectral Efficiency; Studies on The Introduction of Open-Spectrum Policy

Leem, Cha-sik; Lee, Jaiyong; Kang, Hoon; Kim, Chang-joo; Lee, Moonwon; Kang, Sungchul

doi:10.1109/crowncom.2008.4562459

Cited by 3 publications

(1 citation statement)

References 1 publication

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“…Leem et al [16] discussed the spectral efficiency and coverage efficiency of WRAN system in TV bands which are under standardization at the IEEE 802.22 working group (WG). Instead of spectrum underlay technologies which have been used conventionally, spectrum overlay technology model was subjected to analysis and simulations.…”

Section: Related Workmentioning

confidence: 99%

Uplink Capacity Enhancement in IEEE 802.22 Using Modified Duplex Approach

Karthipan¹,

Vishvaksenan²,

Kalidoss³

et al. 2015

Wireless Pers Commun

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Efficient usage of spectrum is highly needed for wireless communication application. Cognitive radio (CR) is capable of using unused spectrum at any time/location by without causing any interference to neighbour. IEEE 802.22 wireless regional area network (WRAN) standard operation principles are based on CR technology and it follows time division duplex/Orthogonal frequency division multiplex as a multiple access scheme. Main problem with these access schemes are large turnaround time or idle time exist in the network. Due to the presence of large turnaround time in a network, severe cross time slot interferences and throughput inefficiency are observed in WRAN network. To combat this effect, modified duplex schemes are developed in this article. From the simulation results, it is observed that proposed technique considerably reduces idle time of the network, and additional data are transmitted through available elapsed time. Hence overall system throughputs are improved in the proposed system.

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Section: Related Workmentioning

confidence: 99%

Uplink Capacity Enhancement in IEEE 802.22 Using Modified Duplex Approach

Karthipan¹,

Vishvaksenan²,

Kalidoss³

et al. 2015

Wireless Pers Commun

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Spectral Efficiency of WRAN Spectrum Overlay in the TV White Space

Leem

Kim

et al. 2008

ETRI Journal

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A Location Based Duplex Scheme for Cross Time Slot Interference Reduction in (IEEE 802.22) Cognitive Radio Based Wireless Regional Area Networks (WRAN)

Kalidoss¹,

Bhagyaveni²,

Ahmed³

2015

AGJSR

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Method of utilizing the scarce spectrum in an efficient manner is an (IEEE 802.22) is a standard for Wireless Regional Area Network (WRAN) based on cognitive radio that operates over underutilized portions of TV bands (54 to 862 MHz). Time Division Duplex (TDD) based WRAN cell has advantages such as dynamic traffic allocation, traffic asymmetry to users and ease of spectrum allocation. However, it suffers from severe cross time slot (CTS) interference when the frames of the cells are not synchronized with adjacent (WRAN) cells. In this paper, we propose a Hybrid Division Duplex (HDD) to mitigate the (CTS) interference. The proposed (HDD) system is much more flexible and efficient in providing asymmetric data service and eliminating (CTS) interference by exploiting the advantages of both (TDD) and frequency division duplex (FDD) schemes. Simulation results show that the proposed HDD scheme system can achieve 9 dB improvements in signal to interference ratio compared to conventional (TDD) based (WRAN).

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Making the Best out of Spectral Efficiency; Studies on The Introduction of Open-Spectrum Policy

Cited by 3 publications

References 1 publication

Uplink Capacity Enhancement in IEEE 802.22 Using Modified Duplex Approach

Uplink Capacity Enhancement in IEEE 802.22 Using Modified Duplex Approach

Spectral Efficiency of WRAN Spectrum Overlay in the TV White Space

A Location Based Duplex Scheme for Cross Time Slot Interference Reduction in (IEEE 802.22) Cognitive Radio Based Wireless Regional Area Networks (WRAN)

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