Regularised analytical constant modulus algorithm for spacetime coded systems
Spacetime coding is an effective approach to increase the data rate and capacity of a wireless communication system that employs multiple transmit and multiple receive antennas. It involves coding techniques that are designed for multiple transmit antennas. We apply the analytical constant modulus algorithm (ACMA) for blind channel estimation (no use of training sequences) of spacetime coded systems and explore the constant modulus (CM) constraints of the transmitted spacetime codes (STCs). A regularised scheme that gives good performance in Gaussian and non-Gaussian noise environments is proposed. Computer simulation results in both single-user and multiuser cases show the improvement in error performance.
regularisation analytical constant modulus algorithm spacetime coding blind channel estimation