Broadband block diagonalization method for single carrier multiuser MIMO network — A time-domain approach

This paper presents a simple design method of single carrier broadband broadcasting weights in multiuser multiple input multiple output (MIMO) network based on the extension of block diagonalization modified for application to frequency selective channels. The proposed approach assumes time-domain processing using tapped delay line (TDL) structure, hence it can avoid the peak to average power ratio (PAPR) problem, and simultaneously, it does not require the addition of cyclic prefix which results in the reduction of data transmission rate. By using sufficient number of TDL, the components of desired signal contained in all the delay path can be utilized, and all the interferences are completely excluded in theoretical sense. In the description of design process, the relation of spatiotemporal degrees of freedom and number of streams, antennas, and tapped delay length is also discussed including the limitation of the proposed method. Then throught computer simulations, the effectiveness and typical natures of the proposed approach are verified.