Fast Maximum-Likelihood Decoder for Quasi-Orthogonal Space-Time Block Code

Table 1

Average number of additions and multiplications for the proposed method and several BERs.

Const.	16-QAM		64-QAM		256-QAM		1024-QAM
BER	+	×	+	×	+	×	+	×
10^−2	143.6	119.9	151.5	126.6	159.7	133.8	163.6	137.1
10^−3	122.2	99.8	124.3	101.7	126.9	104.0	127.7	104.7
10^−4	116.2	94.1	116.9	94.7	117.6	95.4	118.0	95.7
Const.	QPSK		8-PSK		8-APSK		16-APSK
BER	+	×	+	×	+	×	+	×
10^−2	135.7	111.7	150.6	124.9	139.7	114.2	154.2	127.1
10^−3	120.3	97.8	121.7	99.1	120.3	97.5	124.2	101.2
10^−4	115.6	93.6	115.9	93.7	115.4	93.2	116.3	94.1