Performance analysis of a deterministic channel estimator for blocktransmission systems with null guard intervals
Barbarossa, S.; Scaglione, A.; Giarmakis, G.B.
Signal Processing, IEEE Transactions on
Volume 50, Issue 3, Mar 2002 Page(s):684 - 695
Digital Object Identifier 10.1109/78.984763
Summary:A deterministic algorithm was proposed for channel identification
in block communication systems. The method assumed that the channel has
a finite impulse response (FIR) and that null guard intervals of length
greater than the channel order are inserted between successive blocks to
prevent interblock interference and allow block synchronization. In the
absence of noise, the algorithm provides error-free channel estimates,
using a finite number of received data, without requiring training
sequences and without imposing a restriction neither on the channel,
except for finite order and time invariance, nor on the symbol
constellation. Using small perturbation analysis, we derive approximate
expressions of the estimated channel covariance matrix, which are used
to quantify the resilience of the estimation algorithm to additive noise
and channel fluctuations. Specifically, we consider channel fluctuations
induced by transmitter/receiver relative motion, asynchronism, and
oscillators' phase noise. We also compare the channel estimation
accuracy with the Cramer-Rao bound (CRB) and prove that our estimation
method is statistically efficient at practical SNR values for any data
block length. Finally, we validate our theoretical analysis with
simulations and compare our transmission scheme with an alternative
system using training sequences for channel estimation
View citation and abstract |
Cart
