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EVM as Generic QOS Trigger for Heterogeneous Wireless Overlay Networks

ISSN : 0975-3834
Journal from gdlhub / 2017-08-14 11:52:33
Oleh : Rajender Kumar and Brahmjit Singh, International Journal of Wireless & Mobile Networks (IJWMN)
Dibuat : 2012-06-25, dengan 1 file

Keyword : EVM, NAV, VHO, OFDM, QoS (E), Wirless Overlay Network
Subjek : EVM as Generic QOS Trigger for Heterogeneous Wireless Overlay Networks
Url : http://airccse.org/journal/jwmn/0203ijwmn15.pdf
Sumber pengambilan dokumen : Internet

Fourth Generation (4G) Wireless System will integrate heterogeneous wireless overlay systems i.e.


interworking of WLAN/ GSM/ CDMA/ WiMAX/ LTE/ etc with guaranteed Quality of Service (QoS) and


Experience (QoE).QoS(E) vary from network to network and is application sensitive. User needs an


optimal mobility solution while roaming in Overlaid wireless environment i.e. user could seamlessly


transfer his session/ call to a best available network bearing guaranteed Quality of Experience. And If this


Seamless transfer of session is executed between two networks having different access standards then it is


called Vertical Handover (VHO). Contemporary VHO decision algorithms are based on generic QoS


metrics viz. SNR, bandwidth, jitter, BER and delay. In this paper, Error Vector Magnitude (EVM) is


proposed to be a generic QoS trigger for VHO execution. EVM is defined as the deviation of inphase/


quadrature (I/Q) values from ideal signal states and thus provides a measure of signal quality. In 4G


Interoperable environment, OFDM is the leading Modulation scheme (more prone to multi-path fading).


EVM (modulation error) properly characterises the wireless link/ channel for accurate VHO decision.


EVM depends on the inherent transmission impairments viz. frequency offset, phase noise, non-linear-


impairment, skewness etc. for a given wireless link. Paper provides an insight to the analytical aspect of


EVM & measures EVM (%) for key management subframes like association/re-association/disassociation/


probe request/response frames. EVM relation is explored for different possible NAV-Network Allocation


Vectors (frame duration). Finally EVM is compared with SNR, BER and investigation concludes EVM as a


promising QoS trigger for OFDM based emerging wireless standards.

Deskripsi Alternatif :

Fourth Generation (4G) Wireless System will integrate heterogeneous wireless overlay systems i.e.


interworking of WLAN/ GSM/ CDMA/ WiMAX/ LTE/ etc with guaranteed Quality of Service (QoS) and


Experience (QoE).QoS(E) vary from network to network and is application sensitive. User needs an


optimal mobility solution while roaming in Overlaid wireless environment i.e. user could seamlessly


transfer his session/ call to a best available network bearing guaranteed Quality of Experience. And If this


Seamless transfer of session is executed between two networks having different access standards then it is


called Vertical Handover (VHO). Contemporary VHO decision algorithms are based on generic QoS


metrics viz. SNR, bandwidth, jitter, BER and delay. In this paper, Error Vector Magnitude (EVM) is


proposed to be a generic QoS trigger for VHO execution. EVM is defined as the deviation of inphase/


quadrature (I/Q) values from ideal signal states and thus provides a measure of signal quality. In 4G


Interoperable environment, OFDM is the leading Modulation scheme (more prone to multi-path fading).


EVM (modulation error) properly characterises the wireless link/ channel for accurate VHO decision.


EVM depends on the inherent transmission impairments viz. frequency offset, phase noise, non-linear-


impairment, skewness etc. for a given wireless link. Paper provides an insight to the analytical aspect of


EVM & measures EVM (%) for key management subframes like association/re-association/disassociation/


probe request/response frames. EVM relation is explored for different possible NAV-Network Allocation


Vectors (frame duration). Finally EVM is compared with SNR, BER and investigation concludes EVM as a


promising QoS trigger for OFDM based emerging wireless standards.

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