Mimo paper

1. Directed selected mapping for peak-to-average power ratio reduction in MIMO OFDM Fischer, R.F.H.; Hoch, M.; Electronics Letters Volume 42, Issue 22,  Oct. 26 2006 Page(s):1289 - 1290

Problem examined: given $$N_t U$$ IFFTs, what is the best way to use SLM to reduce PAR? The authors note that the max PAR is of most interest. They outline oSLM, which simply applies SLM on each branch (SI = N_t log U), and sSLM which treats all branches as one SLM block (SI = log U). Both of these schemes use N_t U IFFTs. There proposed schemeapplies phase testing only to the worst case antenna. So for each phase testing the antenna with the worst case PAR is determined and mappings are applied only to this antenna until the PAR of that antenna is no longer the worst case. The PAR reduction performance is better than oSLM and sSLM, but the SI = N_t log N_t(U-1)+1, which is much higher.