Hi: ALL.

 I want to do some research about link adpatation via snr.I have one  problem to look for answer here. In this scenario, A and B are two nodes  in one same IEEE 802.11 wlan. when node A send one packet to node B,how  can I make node A get the snr value of the packet when the packet reachs  node B.

 {{{

   struct ath_tx_status {

         u_int16_t       ts_seqnum;      /* h/w assigned sequence number */

         u_int16_t       ts_tstamp;      /* h/w assigned timestamp */

         u_int8_t        ts_status;      /* frame status, 0 => xmit ok */

         u_int8_t        ts_rate;        /* h/w transmit rate index */

 #define HAL_TXSTAT_ALTRATE      0x80    /* alternate xmit rate used */

         int8_t          ts_rssi;        /* tx ack RSSI */

         u_int8_t        ts_shortretry;  /* # short retries */

         u_int8_t        ts_longretry;   /* # long retries */

         u_int8_t        ts_virtcol;     /* virtual collision count */

         u_int8_t        ts_antenna;     /* antenna information */

 };

 }}}

 In this structure, there is one memeber named ts_rssi, what is it for? who  can explain it to me detailedly, not only the comment tx ack RSSI.

 Thanks for your help very much!