Cyclic Prefix Based Time Synchronization and Comb Type Channel Estimation for SC-FDMA Systems over Time-Varying Channels

Odabasioglu N., Leblebici M. M., Karakaya B., Dogan H.

9th International Conference of Information and Communiation Technologies (AICT), Rostov-on-Don, Russia, 14 - 16 October 2015, pp.359-362 identifier identifier

  • Publication Type: Conference Paper / Full Text
  • Volume:
  • Doi Number: 10.1109/icaict.2015.7338579
  • City: Rostov-on-Don
  • Country: Russia
  • Page Numbers: pp.359-362
  • Istanbul University Affiliated: Yes

Abstract

In the long term evolution (LTE) uplink systems, reference signals based on Zadoff-Chu sequences are employed for time synchronization and block type channel estimation because the pilots are inserted into all the subcarriers of one single carrier-frequency division multiple access (SC-FDMA) symbol with a certain period. The block-type channel estimation can be adopted for slowly fading channel while the channel can be considered as stationary within a certain period of SC-FDMA symbols. However, in practice, a wideband radio channel is time-variant and the channel estimation errors based on block-type channel estimation will significantly degrade the performance of SC-FDMA systems in fast fading environments. Therefore, in this paper, the maximum likelihood (ML) time synchronization and comb-type channel estimation for SC-FDMA systems is presented. We demonstrated that the proposed system has significant bit error rate (BER) advantages over fast varying environments.