EURASIP Journal on Wireless Communications and Networking
Code combination for blind channel estimation in general MIMO-STBC systems
EURASIP Journal on Advances in Signal Processing
New rate-2 STBC design for 2 TX with reduced-complexity maximum likelihood decoding
IEEE Transactions on Wireless Communications
IEEE Transactions on Wireless Communications
Rate-embedded doubly directional differential space-time-frequency coding schemes
WiCOM'09 Proceedings of the 5th International Conference on Wireless communications, networking and mobile computing
Adaptive MIMO-OFDM system based on QOSTBC/SFBC with improved feedback scheme
WiCOM'09 Proceedings of the 5th International Conference on Wireless communications, networking and mobile computing
Interference cancellation in distributed space-time coded wireless relay networks
ICC'09 Proceedings of the 2009 IEEE international conference on Communications
Differential quasi-orthogonal space-frequency trellis codes
IEEE Transactions on Wireless Communications
Performance Comparison of MIMO-STBC Systems with Adaptive Semiblind Channel Estimation Scheme
Wireless Personal Communications: An International Journal
Hi-index | 0.01 |
This paper proposes a differential modulation scheme based on quasi-orthogonal space-time block codes (STBCs) when neither the transmitter nor the receiver has knowledge of the channel. A system with four transmit antennas is considered and divided into two subsystems. Each subsystem is equivalent to a system with two transmit antennas and uses differential STBC modulation. Based on the encoding and decoding for the two subsystems, the overall encoding and decoding algorithm for the original system is derived. We also compare the performance of our differential detection with that of the corresponding coherent detection in terms of achieved signal-to-noise ratio (SNR) for a given transmission power and propose a quantitative measure to estimate the performance difference between the coherent quasi-orthogonal code and our differential detection. Furthermore, we show that our differential modulation scheme can be extended to a system with more than four transmit antennas. Compared with the existing differential modulation schemes for four and eight transmit antennas, the proposed scheme has a lower bit-error rate (BER) and provides full diversity and pair-wise decoding complexity.