Study on Capacity of BLAST System with Error Propagation

The capacity of the BLAST system is larger than that of a single antenna system, but error propagation affects the BLAST architecture capacity. The ergodic capacity is analyzed of BLAST architecture with error propagation (EP-BLAST). We find that in EP-BLAST system, the diversity orders of all symbols transmitted by different antenna are same, which are equal to the smallest diversity order of the symbol in error-free BLAST (EF-BLAST). Since it is difficult to obtain a closed-form solution of the ergodic capacity of EP-BLAST, the upper-bound of the capacity is achieved in this paper.