# BER performance of gmsk

**URL:** <https://www.ruby-forum.com/t/ber-performance-of-gmsk/242022>\
**Category:** GNU Radio\
**Created:** [May 20, 2015, 9:10pm UTC](https://www.ruby-forum.com/t/ber-performance-of-gmsk/242022 "2015-05-20T21:10:53Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Detlef\_R](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/d/58f4c7/32.png) [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\
**Post date:** [May 20, 2015, 9:10pm UTC](https://www.ruby-forum.com/t/ber-performance-of-gmsk/242022/1 "2015-05-20T21:10:53Z")

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Hi everyone,

I am testing the BER performance of the gmsk of GNURaido with two USRP,  
one  
as a transmitter, and another as a receiver.  
I find that the error bits would cause the subsequent bits getting  
error.  
The received bits are compared with the transmitted bits, and if one bit  
is  
received correctly, a ‘0’ is marked at the position, otherwise a ‘1’  
marked.  
In the following test result, the front part of bits are received  
correctly. But I get lots of error bits after some bit which is not  
received correctly.  
…00000000000000000000000000000000000000000000000000000000010010110110001001110010100010…  
How to explain this?

Best regards,  
Damon

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**Author:** ![casper\_the\_ghost](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/c/58956e/32.png) [@casper\_the\_ghost](https://www.ruby-forum.com/u/casper_the_ghost)\
**Post date:** [May 22, 2015, 6:17am UTC](https://www.ruby-forum.com/t/ber-performance-of-gmsk/242022/2 "2015-05-22T06:17:10Z")

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Hi Laur,

Thanks for your advice. I will try to test it.

Best regards,  
Damon

2015-05-21 19:07 GMT+08:00 Laur J. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid):