Performance evaluation of code-spread OFDM using Vandermonde spreading

  • Authors:

  • Muthanna Al-Mahmoud;Michael D. Zoltowski

  • Affiliations:

  • School of Electrical and Computer Engineering, Purdue University, West Lafayette, IN;School of Electrical and Computer Engineering, Purdue University, West Lafayette, IN

  • Venue:
  • RWS'09 Proceedings of the 4th international conference on Radio and wireless symposium
  • Year:
  • 2009

Quantified Score

Hi-index 0.00

Visualization

Abstract

Spectral nulls present in a channel can severely degrade or cancel out OFDM tones, resulting in an irreducible error rate. To combat this, standards typically employ forward error correction (FEC) techniques. In Code-Spread OFDM (CS-OFDM), each sinewave carries a weighted sum of all the information symbols being transmitted in an OFDM block interval. In this paper, the MMSE estimator is derived for each symbol for a number of cases, including when the number of carriers is greater than the number of symbols. The performance of CS-OFDM is evaluated using Hadamard and Vandermonde spreading and compared to standard OFDM.