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, Rusya, 14 - 16 Ekim 2015, ss.359-362 identifier identifier

  • Cilt numarası:
  • Doi Numarası: 10.1109/icaict.2015.7338579
  • Basıldığı Şehir: Rostov-on-Don
  • Basıldığı Ülke: Rusya
  • Sayfa Sayıları: ss.359-362

Özet

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.