Multiuser Detection
Coherent Spread Spectrum System
Coherent Spread Spectrum System
On Limits of Wireless Communications in a Fading Environment when UsingMultiple Antennas
Wireless Personal Communications: An International Journal
Adaptive Modulation over Nakagami Fading Channels
Wireless Personal Communications: An International Journal
Space-Time Block Coding for Wireless Communications
Space-Time Block Coding for Wireless Communications
Full-Rate Complex Orthogonal Space-Time Block Code for Multiple Antennas
Wireless Personal Communications: An International Journal
Differential and coherent decorrelating multiuser receivers for space-time-coded CDMA systems
IEEE Transactions on Signal Processing
Minimum variance linear receivers for multiaccess MIMO wireless systems with space-time block coding
IEEE Transactions on Signal Processing
Capacity and error probability analysis for orthogonal space-time block codes over fading channels
IEEE Transactions on Wireless Communications
IEEE Transactions on Wireless Communications
Space-time block codes from orthogonal designs
IEEE Transactions on Information Theory
Space-time block codes: a maximum SNR approach
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
Hi-index | 0.00 |
In this paper, the performance of multiuser CDMA systems with different space time code schemes is investigated over Nakagami fading channel. Low-complexity multiuser receiver schemes are developed for space-time coded CDMA systems with perfect and imperfect channel state information (CSI). The schemes can make full use of the complex orthogonality of space-time coding to obtain the linear decoding complexity, and thus simplify the exponential decoding complexity of the existing scheme greatly. Moreover, it can achieve almost the same performance as the existing scheme. Based on the bit error rate (BER) analysis of the systems, the theoretical calculation expressions of average BER are derived in detail for both perfect CSI and imperfect CSI, respectively. As a result, tight closed-form BER expressions are obtained for space-time coded CDMA with orthogonal spreading code, and approximate closed-form BER expressions are attained for space-time coded CDMA with quasi-orthogonal spreading code. Computer simulation for BER shows that the theoretical analysis and simulation are in good agreement. The results show that the space-time coded CDMA systems have BER performance degradation for imperfect CSI.