ns2中802.16的物理层是ofdm，没有实现ofdma
ofdm的状态有
OFDM_IDLE, /* Module is not doing anything */
OFDM_SEND, /* Module is ready to send or sending */
OFDM_RECV, /* Module is can receive or is receiving */
OFDM_RX2TX, /* Module is transitioning from receiving mode to sending mode */
OFDM_TX2RX /* Module is transitioning from sending mode to receiving mode */
速率为
OFDM_BPSK_1_2, /* Efficiency is 1 bps/Hz */
OFDM_QPSK_1_2, /* Efficiency is 2 bps/Hz */
OFDM_QPSK_3_4, /* Efficiency is 2 bps/Hz */
OFDM_16QAM_1_2, /* Efficiency is 4 bps/Hz */
OFDM_16QAM_3_4, /* Efficiency is 4 bps/Hz */
OFDM_64QAM_2_3, /* Efficiency is 6 bps/Hz */
OFDM_64QAM_3_4, /* Efficiency is 6 bps/Hz */
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