Summary: IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS, VOL. 8, NO. 3, MARCH 2009 1057
Pilot-Symbol-Assisted Detection Scheme for
Distributed Orthogonal Space-Time Block Coding
Hakam (Sami) Muhaidat, Member, IEEE, Murat Uysal, Senior Member, IEEE, and Ravi Adve, Member, IEEE
Abstract--In this letter, we investigate the effect of imperfect
channel estimation on the performance of distributed space-
time block codes (DSTBCs) with amplify-and-forward relaying.
Exploiting the orthogonality of the underlying code, we derive a
maximum likelihood metric conditioned on the channel estimate
acquired through the insertion of pilot symbols. For a large
number of pilot symbols, we demonstrate that the proposed
decoding rule coincides with the so-called mismatched receiver.
On the other hand, as the number of pilot symbols decreases,
the proposed decoder converges to a non-coherent detector.
Through Monte-Carlo simulations, we further demonstrate that
the performance of the proposed scheme lies within 0.8dB of
the genie receiver performance bound.
Index Terms--Cooperative diversity, channel estimation, fad-