Reconfigurable Bandwidth-Efficient Transmit Waveform for High-Rate Telemetry - STRS(LEW-19307-1)

The Reconfigurable Bandwidth-Efficient Transmit Waveform for High-rate Telemetry supports gigabit-per-second data rates and continuously-tunable modulated symbol rates into the hundreds of Msymbols/second on most devices. The supported modulations include GMSK, BPSK, QPSK, OQPSK, 8-PSK, 16-APSK, 16-PSK, 16-QAM, and 32-APSK. Various pulse-shape filtering options are available, using Root-Raised Cosine and Raised Cosine filters, with excess bandwidths between 0.1 and 1.0. The support forward error correction includes Convolutional Coding and Low Density Parity Check (LDPC) codes, specifically the AR4JA and C2 families of LDPC codes. From the AR4JA family, the waveform supports rates 1/2, 2/3, and 4/5. From the C2 family of codes, the waveform supports the rate 7/8 code. The waveform supports up to eight 1/2-rate (k = 7) convolutional coders in parallel, which has been demonstrated to achieve the maximum 150Mbps coded data rate supported by NASAs Tracking and Data Relay Satellite System (TDRSS). Additional data processing includes Consultative Committee for Space Data Systems (CCSDS) - compliant randomization (131.0-B-2) and Advanced Orbiting Systems (AOS) data framing (732.0-B-2). In any communication system, there are linear and non-linear channel impairments which limit the performance. This waveform includes a digital pre-distortion module, which is designed to invert the non-linear distortions of a power amplifier, such as a Traveling Wave Tube Amplifier (TWTA). A re-programmable finite-impulse response (FIR) filter is also included to pre-compensate for linear channel impairments. Finally, the waveform includes in-situ channel characterization capabilities such as a continuous wave (CW) two-tone generator. A programmable digital drive level allows the output power of the waveform to be varied continuously.