Ecole d'ingénieur et centre de recherche en Sciences du numérique

Doppler compensation and beamforming for high mobility OFDM transmissions in multipath

Gopala, Kalyana; Slock Dirk TM

CROWNCOM 2016, 11th EAI International Conference on Cognitive Radio Oriented Wireless Networks, May 30-June 1, 2016, Grenoble, France / Also published in "Lecture Notes of the Institute for Computer Sciences, Social Informatics and Telecommunications Engineering", Vol 172, May 2016, Chapter of "Cognitive Radio Oriented Wireless Networks"

The paper focuses on the use of receive beamforming (BF) for high speed train (HST) scenario under independent Doppler for the dfferent multipath components in a Rician Fading environment. To combat ICI, we not only null out the ICI in the frequency domain, but do a pre-processing in the time domain via frequency correction (demodulation) to maximise the signal part at the output of the FFT. To obtain a suitable demodulation frequency, location aware and location agnostic approaches are considered. Cyclic prefix (CP) based estimation method is also considered as part of location information agnostic approach. In the location-aware approach, a technique that uses both the LoS and dominant scatterer information is also proposed. The paper then provides the optimal weights for the maximisation of the SINR criterion from a theoretical and practical perspective. In the case of linear approximation of the channel variation, the ICI is shown to be a rank 1 interferer and hence can be nulled out with just 2 receiver antennas. Finally, all the methods are compared via simulations. We conclude that in an LTE OFDM system simple, low complex, location agnostic BF schemes are very effective against ICI even with just two receive antennas

Document Doi Bibtex

Titre:Doppler compensation and beamforming for high mobility OFDM transmissions in multipath
Mots Clés:ICI, Doppler,beamforming,SINR, OFDM
Type:Conférence
Langue:English
Ville:Grenoble
Pays:FRANCE
Date:
Département:Systèmes de Communication
Eurecom ref:4917
Copyright: © Springer. Personal use of this material is permitted. The definitive version of this paper was published in CROWNCOM 2016, 11th EAI International Conference on Cognitive Radio Oriented Wireless Networks, May 30-June 1, 2016, Grenoble, France / Also published in "Lecture Notes of the Institute for Computer Sciences, Social Informatics and Telecommunications Engineering", Vol 172, May 2016, Chapter of "Cognitive Radio Oriented Wireless Networks" and is available at : http://dx.doi.org/10.1007/978-3-319-40352-6_24
Bibtex: @inproceedings{EURECOM+4917, doi = {http://dx.doi.org/10.1007/978-3-319-40352-6_24}, year = {2016}, title = {{D}oppler compensation and beamforming for high mobility {OFDM} transmissions in multipath}, author = {{G}opala, {K}alyana and {S}lock {D}irk {TM}}, booktitle = {{CROWNCOM} 2016, 11th {EAI} {I}nternational {C}onference on {C}ognitive {R}adio {O}riented {W}ireless {N}etworks, {M}ay 30-{J}une 1, 2016, {G}renoble, {F}rance / {A}lso published in "{L}ecture {N}otes of the {I}nstitute for {C}omputer {S}ciences, {S}ocial {I}nformatics and {T}elecommunications {E}ngineering", {V}ol 172, {M}ay 2016, {C}hapter of "{C}ognitive {R}adio {O}riented {W}ireless {N}etworks"}, address = {{G}renoble, {FRANCE}}, month = {05}, url = {http://www.eurecom.fr/publication/4917} }
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