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Conventional second-order Doppler tracking loops impose a tradeoff between phase noise and tracking performance. In order to maintain adequate bit-error rate, the loop bandwidth must be narrow enough that phase noise is small. However, this limits the track range, track rate, and acquisition time of the loop. The tradeoff between bandwidth and tracking capabilities can prevent communication during...
The modulation architecture in the Frontier Software Defined Radio platform supports a wide variety of modulation formats with a single low-power hardware/firmware circuit: PSK, QAM, subcarrier BPSK and ranging. The wideband hardware supports downlink data rates from 1 sps to 150 Msps, yet the firmware circuitry can generate tightly controlled narrow-band modulation. This flexibility is achieved with...
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