On MIMO Channel Shortening For Cyclic-Prefixed Systems

In this paper, we consider channel shortening for cyclic-prefixed block transmission system over multiple input multiple output (MIMO) channels. A time domain equalizer (TEQ) is necessary at the receiver front head to mitigate intersymbol interference (ISI). Melsa, Younce, and Rohrs (1996) proposed the most popular MSSNR channel shortening method for single input single output (SISO) channels based on minimizing the energy of the shortened impulse response (SIR) outside the target window while keeping the energy inside constant. Because of computational simplicity of the MSSNR method, we extended this method directly for MIMO channels unlike other MIMO TEQ design methods which perform shortening in multiple stages. We compared our scheme with other MIMO TEQ design techniques for equalization SNR energy compaction ratio, signal to interference plus noise ratio and bit rate. The results show significant improvement over some reported techniques.