James (Jim) kain (@jekain314)
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...
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...
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...
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...
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...
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...
Slartibartfast -- thanks for your patience. I admit I didnt follow your semantic explanation. With OFDM, at the transmitter, we start in the frequency domain --...
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"...
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...
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...
cant seem top open the attachments ..when I click, nothing happens.maybe just send to: jekain314@waldoair.com
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...
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...
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...
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...
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