A Fast Converging Blind Receiver for Space-Time Block Codes over Frequency Selective Channels

Space-Time Block Coding (STBC) and a number of derivative techniques have been developed to maximise the diversity gain of a multiple-input multiple-output (MIMO) channel. For frequency selective fading - i.e. dispersive - MIMO channels, solutions in the literature are fewer, and are in their majority block based, such as MIMO OFDM or time-reversal STBC In order to ultimately achieve better tracking behaviour, in this paper we focus on the development of a non-block-based method which utilises the Constant Modulus Algorithm (CMA). Due to the slow convergence of the CMA, we propose the use of Newtons method to find the optimum solution for the equalizer. A comparison of two different techniques of estimating the inverse of the correlation matrix is presented.