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On Channel Estimation for 802.11p in Highly Time-Varying Vehicular Channels

Keerthi Kumar Nagalapur (Institutionen för signaler och system, Kommunikationssystem) ; Fredrik Brännström (Institutionen för signaler och system, Kommunikationssystem) ; Erik G. Ström (Institutionen för signaler och system, Kommunikationssystem)
IEEE International Conference on Communications (ICC), 10-14 June 2014 p. 5659--5664. (2014)
[Konferensbidrag, refereegranskat]

Vehicular wireless channels are highly time-varying and the pilot pattern in the 802.11p orthogonal frequency-division multiplexing frame has been shown to be ill suited for long data packets. The high frame error rate in off-the-shelf chipsets with noniterative receiver configurations is mostly due to the use of outdated channel estimates for equalization. This paper deals with improving the channel estimation in 802.11p systems using a cross layered approach, where known data bits are inserted in the higher layers and a modified receiver makes use of these bits as training data for improved channel estimation. We also describe a noniterative receiver configuration for utilizing the additional training bits and show through simulations that frame error rates close to the case with perfect channel knowledge can be achieved.

Nyckelord: Vehicular communications, V2X, V2V, 802.11p, Channel Estimation, Cross Layer

This is a revised version of the article found in IEEEXplore. The revision is related to one of the results in Fig. 11 and its interpretation.

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Denna post skapades 2014-03-12. Senast ändrad 2015-03-06.
CPL Pubid: 194823


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