37 research outputs found
Single-Symbol-Decodable Differential Space-Time Modulation Based on QO-STBC
We present a novel differential space-time modulation (DSTM) scheme that is
single-symbol decodable and can provide full transmit diversity. It is the
first known singlesymbol- decodable DSTM scheme not based on Orthogonal STBC
(O-STBC), and it is constructed based on the recently proposed
Minimum-Decoding-Complexity Quasi-Orthogonal Space-Time Block Code
(MDC-QOSTBC). We derive the code design criteria and present systematic
methodology to find the solution sets. The proposed DSTM scheme can provide
higher code rate than DSTM schemes based on O-STBC. Its decoding complexity is
also considerably lower than DSTM schemes based on Sp(2) and
double-symbol-decodable QOSTBC, with negligible or slight trade-off in decoding
error probability performance.Comment: Accepted for IEEE Trans Wireless Comm
Four-Group Decodable Space-Time Block Codes
Two new rate-one full-diversity space-time block codes (STBC) are proposed.
They are characterized by the \emph{lowest decoding complexity} among the known
rate-one STBC, arising due to the complete separability of the transmitted
symbols into four groups for maximum likelihood detection. The first and the
second codes are delay-optimal if the number of transmit antennas is a power of
2 and even, respectively. The exact pair-wise error probability is derived to
allow for the performance optimization of the two codes. Compared with existing
low-decoding complexity STBC, the two new codes offer several advantages such
as higher code rate, lower encoding/decoding delay and complexity, lower
peak-to-average power ratio, and better performance.Comment: 1 figure. Accepted for publication in IEEE Trans. on Signal
Processin