. advantage of the flexibility of computer software such as Matlab and the availability of high speed DSP/FPG A chips. One advantage o f this testbed is that it supports many types of modulation. 0Ir) has the same distribution as n, and ||x||2 = ||x||' which means that the energy is preserved and we have an equivalent representation of a MIMO channel as parallel Gaussian channels: =. model and those in the physical model in the case of MIMO channel. In addition, we only pay attention to uniform antenna arrays in this section, that is, all antennas are aligned and equally