Orthogonal frequency division multiplexing (OFDM) combined with time division multiplexing (TDM), called OFDM/TDM, can bridge the conventional OFDM and single-carrier (SC) transmission by using the frequency-domain equalization (FDE). Accurate channel estimation is required for FDE. A well-known channel estimation scheme is pilot-based channel estimation that uses periodically transmitted pilot signals. If channel estimation error is present, the inter-symbol interference (ISI) is produced in OFDM/TDM. In this paper, we apply a Gaussian approximation to the channel estimation error and theoretically investigate the impact of the imperfect channel estimation on the average bit error rate (BER) performance of OFDM/TDM. It is shown by the numerical evaluation that the channel estimation error degrades more the BER performance when OFDM/TDM approaches SC.
|Number of pages||5|
|Journal||IEEE Vehicular Technology Conference|
|Publication status||Published - 2005|
|Event||2005 IEEE 61st Vehicular Technology Conference -VTC 2005 - Spring Stockholm: Paving the Path for a Wireless Future - Stockholm, Sweden|
Duration: 2005 May 30 → 2005 Jun 1