Preamble Design for Symbol Timing Estimation from Soqpsk-tg Waveforms
نویسندگان
چکیده
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 Cramér-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.
منابع مشابه
Parameter Estimation Bounds and Preamble Designs for SOQPDK Waveforms
In this paper, we derive joint parameter estimation bounds for the symbol timing offset, carrier phase, and carrier frequency offset for any shaped offset quadrature phase shift keying (SOQPSK) waveform. Specifically, we calculate the conditional Cramér-Rao bound (CCRB) for a known given data sequence and compare this to the modified Cramér-Rao bound (MCRB) for the case in which the data patter...
متن کاملSynchronization of Soqpsk-tg in Burst-mode Transmissions
In this paper, we present a maximum likelihood synchronization algorithm which jointly estimates frequency offset, symbol timing and carrier phase for shaped-offset quadrature phase-shift keying (SOQPSK) signals. We have considered a burst-mode transmission scenario in which a known training sequence is embedded in the beginning of each burst for the purpose of data-aided (DA) synchronization i...
متن کاملFpga Implementation of Burst-mode Synchronization for Soqspk-tg
In this paper, we present an FPGA implementation for synchronization of SOQPSK-TG in burst-mode transmissions. The system first detects arrival of new bursts, after which it estimates carrier frequency, carrier phase, and symbol timing offsets. Additionally, it is designed based on the synchronization algorithms developed for the iNET preamble. Here, we introduce some complexity reduction techn...
متن کاملCommon Detectors for Tier 1 Modulations
The ARTM Tier 1 waveforms include two versions of Feher patented QPSK (FQPSK-B and FQPSK-JR) and a version of shaped offset QPSK (SOQPSK-TG). In this paper we examine three common detector architectures for the ARTM Tier 1 modulations: a symbol-by-symbol detector, a cross correlated trellis coded modulation (XTCQM) detector, and a continuous phase modulation (CPM) detector. We show that when us...
متن کاملShaped O set QPSK Capacity
In this work we compute the capacities and the pragmatic capacities of militarystandard shaped-o set quadrature phase-shift keying (SOQPSK-MIL) and aeronautical telemetry SOQPSK (SOQPSK-TG). In the pragmatic approach, SOQPSK is treated as a modulation scheme as opposed to an encoder, and no iterations are performed between the SOQPSK demodulator and the outer binary decoder. We also evaluate th...
متن کامل