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typedef struct {
    signed rssi:8;            /**< signal intensity of packet */
    unsigned rate:5;          /**< data rate */
    unsigned :1;              /**< reserve */
    unsigned sig_mode:2;      /**< 0:is not 11n packet; 1:is 11n packet */
    unsigned :16;             /**< reserve */
    unsigned mcs:7;           /**< if is 11n packet, shows the modulation(range from 0 to 76) */
    unsigned cwb:1;           /**< if is 11n packet, shows if is HT40 packet or not */
    unsigned :16;             /**< reserve */
    unsigned smoothing:1;     /**< reserve */
    unsigned not_sounding:1;  /**< reserve */
    unsigned :1;              /**< reserve */
    unsigned aggregation:1;   /**< Aggregation */
    unsigned stbc:2;          /**< STBC */
    unsigned fec_coding:1;    /**< Flag is set for 11n packets which are LDPC */
    unsigned sgi:1;           /**< SGI */
    unsigned noise_floor:8;   /**< noise floor */
    unsigned ampdu_cnt:8;     /**< ampdu cnt */
    unsigned channel:4;       /**< which channel this packet in */
    unsigned :12;             /**< reserve */
    unsigned timestamp:32;    /**< timestamp */
    unsigned :32;             /**< reserve */
    unsigned :32;             /**< reserve */
    unsigned sig_len:12;      /**< length of packet */
    unsigned :12;             /**< reserve */
    unsigned rx_state:8;      /**< rx state */
} wifi_pkt_rx_ctrl_t;