Superimposed Sequence Versus Pilot Aided Channel Estimations for Next Generation DVB-T Systems

In this paper we analyze the performance of a low complexity superimposed channel estimation technique for orthogonal frequency division multiplexing (OFDM). In particular, an analytical model of interference due to channel estimation errors and imperfect superimposed sequence cancellation at receiver is proposed, whose effectiveness is validated by simulations. Indeed, the significative length of OFDM symbols used in new wide area broadcasting applications makes the superimposed technique a viable alternative to the classical pilot aided technique. For the same computational complexity, the comparison between the two techniques is based on the achievable system throughput both for the current terrestrial digital video broadcasting (DVB-T) standard and for the proposed next generation DVB-T (DVB-T2). Our results show that superimposed technique provides higher bit-rates than the pilot aided technique, with a gain in the range of 4% to 10%.

[1]  Aldo G. Orozco-Lugo,et al.  Iterative Mean Removal Superimposed Training for SISO and MIMO Channel Estimation , 2008, Int. J. Digit. Multim. Broadcast..

[2]  Nevio Benvenuto,et al.  Algorithms for Communications Systems and their Applications , 2021 .

[3]  G.T. Zhou,et al.  A first-order statistical method for channel estimation , 2003, IEEE Signal Processing Letters.

[4]  Fredrik Tufvesson,et al.  Channel estimation with superimposed pilot sequence , 1999, Seamless Interconnection for Universal Services. Global Telecommunications Conference. GLOBECOM'99. (Cat. No.99CH37042).

[5]  Per Ola Börjesson,et al.  Analysis of DFT-Based Channel Estimators for OFDM , 2000, Wirel. Pers. Commun..

[6]  Jitendra K. Tugnait,et al.  Semi-blind channel estimation and detection using superimposed training , 2004, 2004 IEEE International Conference on Acoustics, Speech, and Signal Processing.

[7]  Yiyan Wu,et al.  OFDM system channel estimation using time-domain training sequence for mobile reception of digital terrestrial broadcasting , 2000, IEEE Trans. Broadcast..

[8]  Kaushik Josiam,et al.  Bandwidth Efficient Channel Estimation Using Super-Imposed Pilots in OFDM Systems , 2007, IEEE Transactions on Wireless Communications.

[9]  S.K. Wilson,et al.  On channel estimation in OFDM systems , 1995, 1995 IEEE 45th Vehicular Technology Conference. Countdown to the Wireless Twenty-First Century.