[Discuss-gnuradio] hestimate matrix in Alamouti OFDM communication

[Vanessa Gardellin]

I noticed that the hestimate matrix in the 2x1 ofdm alamouti
communication has crazy values like:

sym: -0.0020 + j-0.0018  ks: -1.0000 + j+0.0000  eq: +282.3798 +
j-254.7796  ==>  -1.0000 + j+0.0000
sym: +0.0017 + j+0.0022  ks: +0.0000 + j+0.0000  eq: +811.7408 +
j-449.4426  ==>  +2.3752 + j+1.0470
sym: +0.0006 + j+0.0003  ks: +1.0000 + j+0.0000  eq: +1341.1019 +
j-644.1057  ==>  +1.0000 + j+0.0000
sym: +0.0001 + j+0.0005  ks: +0.0000 + j+0.0000  eq: +656.4164 +
j-71.1795  ==>  +0.0770 + j+0.3318
sym: -0.0001 + j-0.0020  ks: +1.0000 + j+0.0000  eq: -28.2691 +
j+501.7466  ==>  +1.0000 + j+0.0000

meanwhile when I use a 1x1 ofdm communication I have pretty regular values

sym: -0.0254 + j-0.0084  ks: -1.0000 + j+0.0000  eq: +35.4218 +
j-11.7727  ==>  -1.0000 + j+0.0000
sym: +0.0004 + j+0.0049  ks: +0.0000 + j+0.0000  eq: +33.7460 +
j-10.3629  ==>  +0.0633 + j+0.1618
sym: +0.0289 + j+0.0081  ks: +1.0000 + j+0.0000  eq: +32.0702 +
j-8.9531  ==>  +1.0000 + j-0.0000
sym: -0.0011 + j+0.0022  ks: +0.0000 + j+0.0000  eq: +31.4286 +
j-12.1152  ==>  -0.0078 + j+0.0822
sym: +0.0261 + j+0.0129  ks: +1.0000 + j+0.0000  eq: +30.7870 +
j-15.2773  ==>  +1.0000 + j+0.0000

do you have any idea why this happens?

Any help will be appreciated

Vanessa