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TX power and Tx gain for FMCOMMS5 with no-OS

Question asked by Manos on Mar 28, 2016

Hello,

i have acomplished a transimison of an LTE 20mhz signal ,but the power levels i get are very low.


Attached you can find a capture of the LTE signal i take in the exit of the TX chain using a spectrum analyzer.

Moreover the changes i made in the main.c  (no-OS/main.c at master · analogdevicesinc/no-OS · GitHub )  are listed below.
Could you please give me some guidance regarding the changes i should make in the main.c  (no-OS/main.c at master · analogdevicesinc/no-OS · GitHub ) in order to get  higher tx power levels and achieve a better gain?

 

 

AD9361_RXFIRConfig rx_fir_config = { // BPF PASSBAND 3/20 fs to 1/4 fs

        3, // rx

        -6, // rx_gain

        2, // rx_dec

{
20380,21470,13982,14435,4788,4431,-2416,-3194,

-4718,-5298,-2622,-2634,873,1310,2728,3173,

1930,2016,-268,-551,-1793,-2146,-1536,-1646,

-44,149,1225,1510,1251,1365,216,80,

-841,-1074,-1022,-1133,-307,-212,564,757,

829,935,349,282,-361,-522,-663,-762

-357,-312,210,344,519,612,342,315,

-101,-212,-395,-481,-311,-298,25,114,

291,368,272,270,26,-46,-205,-274,

-228,-234,-57,-1,136,196,184,196,

71,29,-82,-134,-142,-158,-74,-44,

43,85,104,122,69,49,-16,-49,

-72,-90,-60,-47,-2,24,46,64,

48,40,11,-6,-26,-43,-36,-30,

-13,-5,18,29,39,20,36,12,

23,-22,4,-20,0,-23,-5,-9}, // rx_coef[128]

         128, // rx_coef_size

         {983040000, 491520000, 245760000, 122880000, 61440000, 30720000}, //rx_path_clks[6]

         19365514 // rx_bandwidth

};

 

 

AD9361_TXFIRConfig tx_fir_config = { // BPF PASSBAND 3/20 fs to 1/4 fs

3, // tx

6, // tx_gain

2, // tx_int

{

-5,-9, 0,-23,4,-20,23,-22,36,12,

   39,20,18,29,-13,-5,-36,-30,

   -26,-43,11,-6,48,40,46,64,

   -2,24,-60,-47,-72,-90,-16,-49,

   69,49,104,122,43,85,-74,-44,

   -142,-158,-82,-134,71,29,184,196,

   136,196,-57,-1,-228,-234,-205,-274,

   26,-46,272,270,291,368,25,114,

   -311,-298,-395,-481,-101,-212,342,315,

   519,612,210,344,-357,-312,-663,-762,

   -361,-522,349,282,829,935,564,757,

   -307,-212,-1022,-1133,-841,-1074,216,80,

   1251,1365,1225,1510,-44,149,-1536,-1646,

   -1793,-2146,-268,-551,1930,2016,2728,3173,

   873,1310,-2622,-2634,-4718,-5298,-2416,-3194,

   4788,4431,13982,14435,20380,21470}, // tx_coef[128]

  128, // tx_coef_size

  {983040000, 245760000, 122880000, 61440000, 30720000, 30720000}, // tx_path_clks[6]

  19365438 // tx_bandwidth

};

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