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Frequency Hopping Waveform Diversity for Time Delay Estimation

Frequency Hopping Waveform Diversity for Time Delay Estimation

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In this work we consider the use of frequency hopping (FH) communications waveforms for TDE. Thus a high dynamic range narrow band receiver may be employed, subject to the complexity of FH acquisition. Adequate time-bandwidth product for TDE can be achieved by processing over multiple hops. We consider each hop to be a narrow band, flat fading channel that is independent from hop to hop. This introduces carrier phase uncertainty for each hop, and the SNR varies over hops as well. There may also be a small unknown carrier frequency offset per hop, and data symbols may be known (e.g., training in a preamble) or unknown (during communications). We consider the case of known carrier frequencies and known data symbols in this work, but the model is general and more complex cases may be studied in future work.

Inspec keywords: diversity reception; frequency hop communication; channel estimation; radio receivers; waveform analysis; delay estimation; fading channels

Other keywords: data symbol; FH acquisition; dynamic range narrow band receiver; time delay estimation; flat fading channel; carrier frequency offset; FH waveform diversity; frequency hopping communication waveform; TDE; carrier phase uncertainty

Subjects: Multiple access communication; Radio links and equipment; Other topics in statistics; Mathematical analysis; Communication channel equalisation and identification

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