Simyon Pinsky (@SenSen)
Plotting the Range Doppler of an FMCW Radar developed for Vital Signs. The FMCW radar with the following parameters was implemented: %System parametersValue...
A radar using a ULA with a large number of elements(for instance N=150 for 1[deg] beamwidth[1]) is being designed. After the Range and Doppler processing, Digital...
Currently working on a FMCW MIMO radar RX pipe consisting of the following modules:1. 2D CFAR – processing the Range Doppler images per Angle.2. 3D clustering...
Given the required Probability of False Alarm(Pfa) and the number of training cells(N) of SO-CFAR, wondered what would be the correct method for threshold factor derivation...
Interested to determine the size of the FFT used by a proprietary video link transmitting 720p@30fps video. (This can usually be achieved by 5-10 Mbps bit rate)....
This is a propriety video link being BLINDLY demodulated.No parameters are given/known.There was however a progress with the problem, no bits yet though. Will update...
Given an unknown OFDM symbol consisting of 9144 samples, interested to know the size of the FFT used in the TX/Number of bins. Downsampling to 512,256,128,64,32...
Following the previous post, progress was made. Seems that the data bins of the symbol are QPSK while the pilots are BPSK. The following summarizes the findings...
The timing and frequency synchronization is done using the blind CP based method[1], which was implemented and tested for simulated WiFi signal.Examining the indexes...
The ML Blind demodulator functionality was tested using simulated signal(related document sent in private email to info@ortenga.com). I wonder whether the additional...
Thanks.Not sure what do you call circle.Below the two unexpected areas are marked.const2.jpgThe demodulate is very simple and works on the first training symbols,...
Correct.Working on blind demodulation(using Matlab) of recorded OFDM signal."Each square" is the IQ of a symbol of the up-sampled burst.
Hi Shahram,Sorry for not being clear.This is a recorded signal.Each burst consists of 2(LFSR)+14(Data) Symbols.The three plots varies in the value of SNR coefficient...
Currently testing Blind Demodulation methods on recorded OFDM signal. The recordings were done with coax cables. While the estimated Frequency and Time shifts were...
Thank you for the fast and insightful comment. Connecting a receiver to each antenna can not be considered, as the system must be as low cost as possible. As a...
Interested to design an RF Switching Matrix driving a <6Ghz
signal from 5 antennas to 2 RX Channels, of the following structure:The possible inputs into the receiver...
Thank you Y(J)S.Seems that UCA will be required to overcome the ambiguity, and gain the elevation as well as azimuth estimation.Taking into account that most of...
Thank you Y(J)S. I understand the geometry. projection2.pngSeems that the error in the estimated angle can be expressed as: alpha – alpha’ = atan(y0/x0)-...
Thank you.Will review the "Resolving Manifold Ambiguities in Direction-of-Arrival Estimation for Nonuniform Linear Antenna Arrays".Wondered what is your opinion...
Hello, I am currently working on a MUSIC algorithm for DOA of RF emitters in 3D. At the first stage, interested to apply the 1D MUSIC using a linear array of...
Hi David. I am not sure how should the transfer function of the channel be combined/derived given the training sequences as elaborated in the document. You can...
Hi David, Thank you very much for the detailed answer. After working with the two training sequences, still have several open issues. The elaboration can be seen...
Hi David. Using the signal, the frequency and the timing technique as before, I have examined 3 Symbols, following the Preamble:The absolute value of the three...
Following a further research, it does not seem to be possible to perform the sensing in the required range using wifi routers only, due to their limited bandwidth. As...
Hello David. Once again – thank you very much for the assistance. Will analyze the signal according to your comments and post an update soon: Currently using...
Thank you Slartibartfast for such a fast reply.The preamble was derived following a signal analyzis.The pilots will be derived based on statistics of the data symbols.In...
Hello. I am currently working on a semi-blind #OFDM channel estimation. After analyzing the recorded signal(sampling frequency is known), and deriving the following...
Thank you - Motilito, Fred Marshall and Cogwsn for the detailed and fast reply. The proposed SDRs(LMS6002D/AD-FMCOMMS2/Ettus) are all good platforms indeed. As...
I am interested to use an existing hardware to perform a spectrum sensing/monitoring in the frequency range of 2.2-2.6[Ghz]. Taking into account that the 802.11ac...
Short update.The time and frequency tuning of the signal described above, yields LFSR based preamble pattern, as can be seen below:fig1.pngHowever, same approach...
Thank you David.Regarding the original sequence, our findings are aligned. Using the shifted diff as well as cross and auto correlation of different segments of...
Hello David.How are you?Thank you for the detailed answer regarding the previous data set.I will review it carefully tomorrow, and update.As to the post above -...
Hi.While analyzing an OFDM signal sampled at 40Mhz, with the following Spectrum:fskorofdm1.pngUsing mainly cross-correlation, preamble of the size 3658 samples is
being...
Hello David.Thank you very much for you interest.Following our last correspondence on the issue, and thanks to your help, the issue was solved.The frequency was...
Hello David.Thank you very much for the help.In the beginning, the FHSS_2 was examined to be aligned to your answer from January 21, 2017 . However, according to...
Hi David,
Once again - thank you very much for the highly detailed answer.
I have tried to follow your instructions, however, did not receive
the same results.
Wonder...
Hi David. Thank you for the reply. The spectrum is indeed OFDM like, however, the constellation used(QAM4/16/…,) can not be identified. Applying a high resolution...
Hi David, Further study of the signal indeed reveals the symbols and the CP. CP_size = 1/8*Symbol_Duration Symbol_Duration=3656 However, after LP filtering,...
Thank you for the detailed and very helpful answer.P.S.Seems to me that there are 3 short consecutive sequences(length of 913 each).
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