EM algorithm

Low-complexity a posteriori probability approximation in EM-based channel estimation for trellis-coded systems

When estimating channel parameters in linearly modulated communication systems, the iterative expectation-maximization (EM) algorithm can be used to exploit the signal energy associated with the unknown data symbols. It turns out that the channel …

A novel quantize-and-forward cooperative system : channel parameter estimation techniques

The Quantize and Forward cooperative communication protocol improves the reliability of data transmission by allowing a relay to forward to the destination a quantized version of the signal received from the source. In prior studies of the Quantize …

A novel quantize-and-forward cooperative system: channel estimation and M-PSK detection performance

A method to improve the reliability of data transmission between two terminals without using multiple antennas is cooperative communication, where spatial diversity is introduced by the presence of a relay terminal. The Quantize and Forward (QF) …

EM based channel estimation in an amplify-and-forward relaying network

Cooperative communication offers a way to obtain spatial diversity in a wireless network without increasing hardware demands. The different cooperation protocols proposed in the literature [1] are often studied under the assumption that all channel …

Turbo estimation and equalization for asynchronous uplink MC-CDMA

In this contribution, we propose a new code-aided synchronization and channel estimation algorithm for uplink MC-CDMA. The space alternating generalized expectation-maximization (SAGE) algorithm is used to estimate the channel impulse responses, …

Sequence estimation and synchronization from nonsynchronized samples

Recent advances in digital signal processing chips have motivated the study of algorithms for data detection and timing extraction that are easily digitally implemented. These algorithms operate on samples of the output of a matched-filter obtained …