An introduction to signal detection and estimation (2nd ed.)
An introduction to signal detection and estimation (2nd ed.)
On Limits of Wireless Communications in a Fading Environment when UsingMultiple Antennas
Wireless Personal Communications: An International Journal
EURASIP Journal on Applied Signal Processing
Time-varying Channel Estimation and Symbol Detection Using Superimposed Training in OFDM Systems
Wireless Personal Communications: An International Journal
Iterative CDMA Multiuser Receiver With Soft Decision-Directed Channel Estimation
IEEE Transactions on Signal Processing
Channel estimation for space-time orthogonal block codes
IEEE Transactions on Signal Processing
Adaptive Channel Estimation Using Pilot-Embedded Data-Bearing Approach for MIMO-OFDM Systems
IEEE Transactions on Signal Processing
Training-Based MIMO Systems: Part II—Improvements Using Detected Symbol Information
IEEE Transactions on Signal Processing
IEEE Transactions on Wireless Communications
IEEE Transactions on Information Theory
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In this work an enhanced semi-blind channel estimator is presented for multicarrier CDMA systems with multiple transmit and receive antennas. The novel scheme is based on embedded pilots that are characterized as virtual users and their number is determined in a dynamic fashion according to the propagation channel conditions. The superimposed code-multiplexed pilots are used initially for channel estimation before the despreading operation, thus achieving per subcarrier estimation using the known unique multi-layer pattern of the virtual users. Afterwards, the estimation is enhanced by using the despread pilots. Furthermore, an iterative scheme is incorporated in channel estimation process minimizing the effect of multiuser interference and operates either in interference cancellation, or in virtual user mode. The proposed architecture is evaluated for spatial diversity systems (space- frequency block coded) with two transmit and up to four receive antennas operating in realistic propagation channels for various modulation and coding schemes. The results demonstrate a significant performance improvement especially as the channel is dominated by its time variant characteristics. The dynamic assignment of spreading codes in the payload and the pilots offers to the system realistic flexibility and adaptivity in demanding channels achieving concurrently maximization of the real overall system throughput, while maintaining low overhead and complexity burden.