Rayleigh fading multi-antenna channels
EURASIP Journal on Applied Signal Processing
A Survey of Algebraic Unitary Codes
IWCC '09 Proceedings of the 2nd International Workshop on Coding and Cryptology
Proceedings of the 2009 International Conference on Wireless Communications and Mobile Computing: Connecting the World Wirelessly
Effects of non-identical rayleigh fading on differential unitary space-time modulation
IEEE Transactions on Communications
IEEE Transactions on Wireless Communications
Differential distributed cayley space-time codes
IEEE Transactions on Wireless Communications
An application of the Bruhat decomposition to the design of full diversity unitary space-time codes
IEEE Transactions on Information Theory
Recursive space-time trellis codes using differential encoding
IEEE Transactions on Information Theory
A real orthogonal space-time coded UWB scheme for wireless secure communications
EURASIP Journal on Wireless Communications and Networking - Special issue on wireless physical layer security
| Hi-index | 754.96 |
We consider the design of space-time constellations based on group codes for fading channels with multiple transmit and receive antennas. These codes can be viewed as multiantenna extensions of phase-shift keying (PSK), in the sense that all codewords have equal energy, all are rotations of a fixed codeword, and there is a simple differential transmission rule that allows data to be sent without channel estimates at the transmitter or receiver. For coherent detection, we show that all optimal full-rank space-time group codes are unitary (each code matrix has equal-energy, orthogonal rows). This leads to a simpler code design criterion and suggests that unitary codes may play an important role in coherent as well as noncoherent communication. For any number of transmit antennas t, we then use the design criterion to characterize all full-rank unitary space-time group codes of minimum block length (also t) which have 2p codewords. These results allow us to characterize all optimal 2p-ary unitary group codes with square code matrices. This restricted class of block codes matches the class proposed for differential modulation by Hughes (see IEEE Trans. Inform. Theory, vol.46, p.2567-78, Nov. 2000), and by Hochwald and Sweldens (see IEEE Trans. Commun., vol.48, p.2041-2052, Dec. 2000).