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From: | David Burgess |
Subject: | Re: [Discuss-gnuradio] Question about OpenBTS BM 2009 RF chains |
Date: | Fri, 11 Sep 2009 16:51:41 -0700 |
Hanwen - The -60 dBm refers to the signal level at the output of the USRP, not the final ouput of the BTS. The leakage signal is amplified by the PA, but in the full BTS design you reference it is subject to an additional 70 dB attenuation in the duplexer. So the actual output level at the antenna is 30 dBm - 80 dB - 70 dB = -114 dBm. This is still high enough to limit uplink receiver performance and will be reduced further in future revisions of the hardware. -- David On Sep 8, 2009, at 6:22 AM, hanwen wrote: Hi, David A. Burgess Kestrel Signal Processing, Inc. |
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