Channel Estimation and Demodulation of
Asynchronous CDMA Signals in
Frequency-Selection Fading Channels
Tampere, Finland, September 5-8, 2000.
In this paper, we propose an iterative scheme for joint tracking
of fading channels
and demodulation of multi-user
CDMA signals operating asynchronously
over multipath fading channels.
We use the expectation
maximization algorithm to track the time-varying channel
and as a by-product we also
achieve estimates of the input signals. We show that the
maximum a posteriori estimates
of the fading channels is iteratively computed by the
The input signals are demodulated using a hidden
Markov model smoother.
Our scheme has computational complexity and
memory requirement that
grow linearly with the data length.
Computer simulations illustrate the performance of our proposed
detection and estimation method.
OFDM Channel Tracking,
in Pdf 157K