• ON IF-TO-BASEBAND TRANSLATION AND RESAMPLING IN SAMPLED-DATA RECEIVERS

      Rice, Michael; Hogstrom, Christopher; Nash, Chris; BYU, Dept Elec & Comp Eng (International Foundation for Telemetering, 2017-10)
      This paper summarizes the design of a discrete-time quadrature downconversion and resampling processor that operates on samples of a 70 MHz IF signal. The unique properties of discrete-time processing—aliasing due to resampling bandpass signals and polyphase filter decompositions—are applied to create a low-complexity approach that does not require any arithmetic operations at the IF sample rate. The required tasks are performed in two stages: a downsample-by-2 operation followed by a more traditional resampler based on a polyphase filterbank.
    • A SUMMARY OF DATA-AIDED EQUALIZER EXPERIMENTS AT EDWARDS AFB

      Rice, Michael; Hogstrom, Christopher; Nash, Chris; Ravert, Jeff; Saquib, Mohammad; Afran, Md. Shah; Cole-Rhodes, Arlene; Moazzami, Farzad; Perrins, Erik; Temple, Kip; et al. (International Foundation for Telemetering, 2017-10)
      This paper summarizes the analysis of bit error rate data captured during flight tests designed to compare data-aided equalizers with SOQPSK-TG to unequalized and currently available blind, adaptive equalizers with SOQPSK-TG. The number of bit errors,on a second-by-second basis, are analyzed. The results are different for each test point. Given the uncertain behavior of the preamble detector for the data-aided equalizer and the differing channel conditions between the data-aided equalizer channel and the conventional serial streaming telemetry channel, we are unable to draw any firm comparative conclusions.