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- Henk Wymeersch, Heidi Steendam, Marc Moeneclaey
- ICC
- 2004

In this paper, we consider different types of guard intervals for OFDM systems, i.e. cyclic prefix (CP), zero padding (ZP) and known symbol padding (KSP). We compare the different OFDM systems with respect to their SNR performance. We show that CP-OFDM and ZP-OFDM have exactly the same performance, whereas KSP-OFDM has a slightly worse performance. Further,… (More)

- Nele Noels, Cédric Herzet, +5 authors Luc Vandendorpe
- ICC
- 2003

—This paper is devoted to turbo synchronization, that is to say the use of soft information to estimate parameters like carrier phase, frequency offset or timing within a turbo receiver. It is shown how maximum-likelihood estimation of those synchronization parameters can be implemented by means of the iterative expectation-maximization (EM) algorithm [1].… (More)

- Heidi Steendam, Marc Moeneclaey
- IEEE Trans. Communications
- 1999

—In mobile radio communication, the fading channels generally exhibit both time-selectivity and frequency-selectivity. Orthogonal frequency-division multiplexing has been proposed to combat the frequency-selectivity, but its performance is also affected by the time-selectivity. In this paper, we investigate how various parameters, such as the number of… (More)

- Heidi Steendam, Marc Moeneclaey
- IEEE Communications Letters
- 2001

In this contribution we consider the Cramer-Rao bound (CRB) for the estimation of the time delay of a noisy linearly modulated signal with random data symbols and random carrier phase. Because of the presence of the nuisance parameters (i.e., data symbols and carrier phase), a closed-form expression of this CRB is very hard to obtain for arbitrary PSK, QAM… (More)

- Nele Noels, Henk Wymeersch, Heidi Steendam, Marc Moeneclaey
- IEEE Trans. Communications
- 2004

—This paper derives the Cramer–Rao bound (CRB) related to the estimation of the time delay of a linearly modulated bandpass signal with unknown carrier phase and frequency. We consider the following two scenarios: joint estimation of the time delay, the carrier phase, and the carrier frequency; and joint estimation of the time delay and the carrier… (More)

- Nele Noels, Vincenzo Lottici, +4 authors Luc Vandendorpe
- EURASIP J. Wireless Comm. and Networking
- 2005

This contribution considers turbo synchronization, that is to say, the use of soft data information to estimate parameters like carrier phase, frequency, or timing offsets of a modulated signal within an iterative data demodulator. In turbo synchronization, the receiver exploits the soft decisions computed at each turbo decoding iteration to provide a… (More)

- Heidi Steendam, Marc Moeneclaey
- Signal Processing
- 2000

- Mohamed Marey, Heidi Steendam
- IEEE Transactions on Signal Processing
- 2007

In OFDM systems, the symbol timing synchronization is needed to find an estimate of where the symbol starts. The most popular of the pilot-aided timing estimators is the one proposed by Schmidl and Cox (S&C) ["Robust Frequency and Timing Synchronization for OFDM," <i>IEEE Transactions on Communications</i>, vol. 45, no. 12, pp. 1613-1621, Dec. 1997].… (More)

- Heidi Steendam, Marc Moeneclaey
- IEEE Communications Letters
- 2001

—In this letter we consider the Cramer–Rao bound (CRB) for the estimation of the carrier phase and frequency of a noisy linearly modulated signal with random data symbols. The observation vector consists of the matched filter output samples taken at the symbol rate, assuming known symbol timing. Because of the presence of the random data, the evaluation of… (More)