>>
>> > 3) Are the obtained coefficients eligible to be used in further precoding of
>> > transmitted packets, assuming that the channel between Tx/Rx is reciprocal, and
>> > that a receiver can switch roles with the transmitter?
>>
>> That's more of a signal processing question, and as such the (annoying)
>> answer is: Depends on your application. Are you attempting some kind of
>> waterfilling algorithm? In any case, discard the phase before you do
>> so, and make sure you have some kind of limiter.
The main idea was to perform cooperative beamforming in order to null out transmission at certain locations. Based on the acquired channel estimates, a precoding matrix can be obtained to cancel the sum of transmitted signals at certain receiving nodes. However, a precise estimate of the channel coefficients (magnitude and phase) should be obtained. Therefore, I cannot simply discard the phase part. Is there some sort of uncompensated phase ambiguity in the hardware of the used USRP nodes?
>>
>> MB
>>
>> --
>> Karlsruhe Institute of Technology (KIT)
>> Communications Engineering Lab (CEL)
>>
>> Dipl.-Ing. Martin Braun
>> Research Associate
>>
>> Kaiserstra?e 12
>> Building 05.01
>> 76131 Karlsruhe
>>
>> Phone: +49 721 608-43790
>> Fax: +49 721 608-46071
>> www.cel.kit.edu
>> KIT -- University of the State of Baden-W?rttemberg and
>> National Laboratory of the Helmholtz Association
--
---------------------------------------------------Mohammed Hassan Karmoose
Teaching Assistant, Electrical Engineering Dept.
Faculty of Engineering, Alexandria University
Al-Horeya Rd, El-Hadara, Alexandria, Egypt - 21544
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