Differential modulation based on quasi-orthogonal codes
IEEE Transactions on Wireless Communications
Differential quasi-orthogonal space-time block codes
IEEE Transactions on Wireless Communications
Differential space-time modulation
IEEE Transactions on Information Theory
Multiple transmit antenna differential detection from generalized orthogonal designs
IEEE Transactions on Information Theory
Signal constellations for quasi-orthogonal space-time block codes with full diversity
IEEE Transactions on Information Theory
A simple transmit diversity technique for wireless communications
IEEE Journal on Selected Areas in Communications
Space-time block coding for wireless communications: performance results
IEEE Journal on Selected Areas in Communications
A differential detection scheme for transmit diversity
IEEE Journal on Selected Areas in Communications
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We report a simple differential modulation scheme for quasi-orthogonal space-time block codes. A new class of quasi-orthogonal coding structures that can provide partial transmit diversity is presented for various numbers of transmit antennas. Differential encoding and decoding can be simplified for differential Alamouti-like codes by grouping the signals in the transmitted matrix and decoupling the detection of data symbols, respectively. The new scheme can achieve constant amplitude of transmitted signals, and avoid signal constellation expansion; in addition it has a linear signal detector with very low complexity. Simulation results show that these partial-diversity codes can provide very useful results at low SNR for current communication systems. Extension to more than four transmit antennas is also considered.