beta的取值应该对QPSK和QAM调制有区别.可参见3GPP TSG-RAN-1 R1-031303 “system-level evaluation of OFDM further considerations”, Ericsson.其实EESM这种方法正式发布,是Ericsson在3GPP2的提案里,可参见3GPP2-C30-20030429-010, “Effective SNR mapping for modelling frame error rules in multiple-state channels”, Ericsson , April 2003.