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James (Jim) kain (@jekain314)


Re: OFDM with real-only transmission

Reply posted 4 days ago (07/18/2024)
Sorry for delayed response .. I'm working on a simulation to demo the results described below. You stated:....most channel effects of interest to comm systems that...

Re: OFDM with real-only transmission

Reply posted 1 month ago (06/21/2024)
I think the long play is robustness/graceful degradation to channel disturbance with fixed BER and spectrum use. The real-only path recursive solutions provide a...

Re: OFDM with real-only transmission

Reply posted 1 month ago (06/21/2024)
The s1(t) and s2(t) are two totally independent communication signals. Just like two separate MIMO streams. If I can send 54mbps on s1(t), then I can also simultaneously...

Re: OFDM with real-only transmission

Reply posted 1 month ago (06/21/2024)
So sorry kaz --- I'm not a Matlab programmer.I hand-bang this stuff using Visual Studio and C/C++. The issue may be the mechanization of FFTW -- its very well documented...

Re: OFDM with real-only transmission

Reply posted 1 month ago (06/21/2024)
Eric -- your credentials are indeed impressive. And I agree that suggesting a 2x datarate improvement for a 50-yr-old tech is a bit like anti-gravity boots. My background...

Re: OFDM with real-only transmission

Reply posted 1 month ago (06/21/2024)
thanks for noting this confusion.I was (erroneously) referring to the FFTW software implementation of the IFFT. There, the input array is a complex array (each array...

Re: OFDM with real-only transmission

Reply posted 1 month ago (06/19/2024)
Slartibartfast -- thanks for your patience. I admit I didnt follow your semantic explanation. With OFDM, at the transmitter, we start in the frequency domain --...

Re: Direct RF radio

Reply posted 1 month ago (06/18/2024)
I am thinking of an app that does both comm and GNSS in the presence of unwanted (and unknown) signals. The AD9084 4Tx4Rx transceiver chip has a "Spectrum Sniffer/Monitor"...

Re: OFDM with real-only transmission

Reply posted 1 month ago (06/18/2024)
I was under the impression that the IQMixer had the ability to send two independent time-history signals, s1(t)  and s2(t), within the same bandwidth. From the...

OFDM with real-only transmission

New thread started 1 month ago
Consider a 64 subcarrier OFDM waveform with 20MHz bandwidth. At the transmitter, we would generate 64 complex numbers (A(n) + jB(n))  n=1, 2, 3, .... 64 using the...

Re: Direct RF radio

Reply posted 1 month ago (06/18/2024)
cant seem top open the attachments ..when I click, nothing happens.maybe just send to:  jekain314@waldoair.com

Re: Direct RF radio

Reply posted 1 month ago (06/15/2024)
Thanks Matt (and Chuck) for your thoughtful response(s). I am getting in to the communications field after "retiring" from another engineering field -- solely because...

Re: Direct RF radio

Reply posted 1 month ago (06/14/2024)
My question came from considering the goals of SDR to move the ADC closer to the antenna (e.g., Direct RF sampling) -- also the youtube article below that discussed...

Direct RF radio

New thread started 1 month ago
I am looking at the pre-release Analog Devices AD9084  -- APOLLO MxFE. This has 4TX and 4Rx and ADC/DAC at 20/28 Gsps. There is also a less capable but similar...

Re: Future of Signal Processing

Reply posted 1 month ago (06/10/2024)
A key to robust-to-disturbance high-speed data transfer is the multicarrier waveform. The preamble's individual tones with predefined phase/amplitude act to calibrate...
Charlie .. Thanks for the detailed note.wow ... that goes way back. I found your/Gold's original Lerner filter work at Lincoln Lab circa 1965:https://apps.dtic.mil/sti/tr/pdf/AD0627146.pdfI'll...
I would like to make a bandpass filter for an SDR project by passing the signal through two (or more) transfer functions in parallel. Each transfer function uses...

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