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Summary: IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS, VOL. 8, NO. 2, FEBRUARY 2009 1
New Rate-2 STBC Design for 2 TX with
Reduced-Complexity Maximum Likelihood
Decoding
Payam Rabiei, Student Member, IEEE, Naofal Al-Dhahir, Fellow, IEEE and Robert Calderbank, Fellow, IEEE
Abstract--We propose a new full-rate space-time block code
(STBC) for two transmit antennas which can be designed to
achieve maximum diversity or maximum capacity while enjoy-
ing optimized coding gain and reduced-complexity maximum-
likelihood (ML) decoding. The maximum transmit diversity
(MTD) construction provides a diversity order of 2Nr for any
number of receive antennas Nr at the cost of channel capac-
ity loss. The maximum channel capacity (MCC) construction
preserves the mutual information between the transmit and the
received vectors while sacrificing diversity. The system designer
can switch between the two constructions through a simple
parameter change based on the operating signal-to-noise ratio
(SNR), signal constellation size and number of receive antennas.
Thanks to their special algebraic structure, both constructions
enjoy low-complexity ML decoding proportional to the square of
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