Abstract
This letter deals with turbo equalization for coded data transmission over intersymbol interference (ISI) channels. We propose a message-passing algorithm that uses the expectation propagation rule to convert messages passed from the demodulator and decoder to the equalizer and computes messages returned by the equalizer by using a partial Gaussian approximation (PGA). We exploit the specific structure of the ISI channel model to compute the latter messages from the beliefs obtained using a Kalman smoother/equalizer. Doing so leads to a significant complexity reduction compared to the initial PGA implementation. Results from Monte Carlo simulations show that the proposed approach leads to a significant performance improvement compared to state-of-the-art turbo equalizers and allows for trading performance with complexity.
Original language | English |
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Journal | I E E E Signal Processing Letters |
Volume | 23 |
Issue number | 9 |
Pages (from-to) | 1216-1220 |
ISSN | 1070-9908 |
DOIs | |
Publication status | Published - 16 Jun 2016 |
Keywords
- turbo equalization
- Message passing
- partial Gaussian approximation (PGA)