SNR degradation due to timing and frequency synchronization errors for OFDMA systems with subband carrier allocation

Konstantinos, M; Adamis, A; Constantinou, P

dc.contributor.author	Konstantinos, M	en
dc.contributor.author	Adamis, A	en
dc.contributor.author	Constantinou, P	en
dc.date.accessioned	2014-03-01T02:45:47Z
dc.date.available	2014-03-01T02:45:47Z
dc.date.issued	2008	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/32393
dc.subject	OFDMA	en
dc.subject	Snr degradation	en
dc.subject	Subband allocation	en
dc.subject	Time and frequency synchronization	en
dc.subject.other	Acoustic intensity	en
dc.subject.other	Degradation	en
dc.subject.other	Errors	en
dc.subject.other	Frequency division multiple access	en
dc.subject.other	Frequency division multiplexing	en
dc.subject.other	Model structures	en
dc.subject.other	Orthogonal frequency division multiplexing	en
dc.subject.other	Signal to noise ratio	en
dc.subject.other	Synchronization	en
dc.subject.other	Telecommunication systems	en
dc.subject.other	Allocation strategies	en
dc.subject.other	Analytical relations	en
dc.subject.other	Carrier allocations	en
dc.subject.other	Frequency dispersions	en
dc.subject.other	Frequency synchronization errors	en
dc.subject.other	In bands	en
dc.subject.other	Multiple users	en
dc.subject.other	OFDM symbols	en
dc.subject.other	OFDM systems	en
dc.subject.other	OFDMA	en
dc.subject.other	Ofdma systems	en
dc.subject.other	Optimal samplings	en
dc.subject.other	Performance degradations	en
dc.subject.other	Simulation results	en
dc.subject.other	Snr degradation	en
dc.subject.other	SNR degradations	en
dc.subject.other	Sub carriers	en
dc.subject.other	Subband allocation	en
dc.subject.other	Subcarrier frequencies	en
dc.subject.other	Synchronization errors	en
dc.subject.other	Time and frequency synchronization	en
dc.subject.other	Time shifts	en
dc.subject.other	Frequency allocation	en
dc.title	SNR degradation due to timing and frequency synchronization errors for OFDMA systems with subband carrier allocation	en
heal.type	conferenceItem	en
heal.identifier.primary	10.1109/EW.2008.4623899	en
heal.identifier.secondary	http://dx.doi.org/10.1109/EW.2008.4623899	en
heal.identifier.secondary	4623899	en
heal.publicationDate	2008	en
heal.abstract	Phase noise, frequency dispersion and time shifts are main challenges that concern OFDM systems. However, perfect synchronization between a transmitter and a receiver cannot be accomplished. These difficulties are dilated in an OFDMA system and consequently the performance degradation due to synchronization errors is increased. The receiver has the task to choose optimal sampling instants and to align the subcarrier frequencies of an OFDM symbol that contains signals from multiple users. In this study the effects of time and frequency synchronization errors are examined. The presented results refer to adjacent subcarrier permutation OFDMA systems where users are separated in bands of adjacent subcarriers. First an uplink OFDMA system model is presented and analytical relations explaining how synchronization errors cause both intercarrier and intersymbol interference are extracted. Then simulation results that quantify the SNR degradation due to synchronization errors are presented. The system used as a reference in this current study is the mobile WiMax with subband OFDMA allocation strategy and 1024 subcarriers.	en
heal.journalName	EW2008 - 14th European Wireless Conference 2008, Electronic Proceedings	en
dc.identifier.doi	10.1109/EW.2008.4623899	en