6 research outputs found
Amicable Orthogonal Designs of Order 8 for Complex Space-Time Block Codes
New amicable orthogonal designs AODs(8; 1; 1; 1; 2; 2; 2), AODs(8; 1; 1; 4; 1; 2; 2), AODs(8; 1; 2;2; 2; 2; 4), AODs(8; 1; 2; 2; 1; 2; 4), AODs(8; 1; 1; 2; 1; 2; 4), AODs(8; 1; 2; 4; 2; 2; 2), AODs(8; 1; 1; 4; 1; 1; 2; 2), AODs(8; 2; 2; 2; 2; 2; 2; 2; 2) and AODs(8; 1; 1; 1; 2; 1; 2; 2; 2) are found by applying a new theorem or by an exhaustive search. Also some previously undecided cases of amicable pairs are demonstrated to be non-existent after a complete search of the equivalence classes for orthogonal designs
Square Complex Orthogonal Designs with Low PAPR and Signaling Complexity
Space-Time Block Codes from square complex orthogonal designs (SCOD) have
been extensively studied and most of the existing SCODs contain large number of
zero. The zeros in the designs result in high peak-to-average power ratio
(PAPR) and also impose a severe constraint on hardware implementation of the
code when turning off some of the transmitting antennas whenever a zero is
transmitted. Recently, rate 1/2 SCODs with no zero entry have been reported for
8 transmit antennas. In this paper, SCODs with no zero entry for transmit
antennas whenever is a power of 2, are constructed which includes the 8
transmit antennas case as a special case. More generally, for arbitrary values
of , explicit construction of rate SCODs
with the ratio of number of zero entries to the total number of entries equal
to is reported,
whereas for standard known constructions, the ratio is . The
codes presented do not result in increased signaling complexity. Simulation
results show that the codes constructed in this paper outperform the codes
using the standard construction under peak power constraint while performing
the same under average power constraint.Comment: Accepted for publication in IEEE Transactions on Wireless
Communication. 10 pages, 6 figure
On amicable orthogonal designs of order 8 for complex space-time block codes
theorem or by an exhaustive search. Also some previously undecided cases of amicable pairs are demonstrated to be non-existent after a complete search of the equivalence classes for orthogonal designs. 2000 Mathematics subject classification (Amer. Math. Soc.): 05B30, 15A36.