Preamble Design for Symbol Timing Estimation from SOQPSK-TG Waveforms

• Main Authors: Erkmen, Baris I., Tkacenko, Andre, Okino, Clayton M.
• Other Authors: California Institute of Technology
• Language: en_US
• Published: International Foundation for Telemetering 2009
• Subjects: SOQPSK; symbol timing; preamble; Cramér-Rao bound; maximum likelihood
• Online Access: http://hdl.handle.net/10150/606119; http://arizona.openrepository.com/arizona/handle/10150/606119

ITC/USA 2009 Conference Proceedings / The Forty-Fifth Annual International Telemetering Conference and Technical Exhibition / October 26-29, 2009 / Riviera Hotel & Convention Center, Las Vegas, Nevada === Data-aided symbol synchronization for bursty communications utilizes a predetermined modulation sequence, i.e., a preamble, preceding the payload. For effective symbol synchronization, this preamble must be designed in accordance with the modulation format. In this paper, we analyze preambles for shaped offset quadrature phase-shift keying (SOQPSK) waveforms. We compare the performance of several preambles by deriving the Cram´er-Rao bound (CRB), and identify a desirable one for the Telemetry Group variant of SOQPSK. We also demonstrate, via simulation, that the maximum likelihood estimator with this preamble approaches the CRB at moderate signal-to-noise ratio.