RATE_MCS
signal = RATE_MCS(rxdesc->rate_mode, signal);
.mcs = RATE_MCS(RATE_MODE_CCK, 0),
.mcs = RATE_MCS(RATE_MODE_CCK, 1),
.mcs = RATE_MCS(RATE_MODE_CCK, 2),
.mcs = RATE_MCS(RATE_MODE_CCK, 3),
.mcs = RATE_MCS(RATE_MODE_OFDM, 0),
.mcs = RATE_MCS(RATE_MODE_OFDM, 1),
.mcs = RATE_MCS(RATE_MODE_OFDM, 2),
.mcs = RATE_MCS(RATE_MODE_OFDM, 3),
.mcs = RATE_MCS(RATE_MODE_OFDM, 4),
.mcs = RATE_MCS(RATE_MODE_OFDM, 5),
.mcs = RATE_MCS(RATE_MODE_OFDM, 6),
.mcs = RATE_MCS(RATE_MODE_OFDM, 7),