Method for phase and symbol synchronization, channel estimation and frequency domain equalization of SC-FDE system

Abstract

The invention discloses a method for phase and symbol synchronization, channel estimation and frequency domain equalization of an SC-FDE system, wherein a receiver in the method performs frame synchronization, fraction multiplication channel estimation and fraction multiplication frequency domain equalization on an over-sampling signal, and eliminates influences cause by carrier phases, multipath interferences and frame synchronization errors through the fraction multiplication channel estimation and the fraction multiplication frequency domain equalization so as to achieve the timing synchronization and the frequency domain equalization of a carrier phase and a symbol of a modulated signal. The method has the characteristics of strong anti-multipath capability, capability of estimating and equalizing a multipath channel with fraction multiplication symbol period intervals, no limitation to signal demodulation mode and signal demodulation and detection method and the like, and is especially suitable for single-carrier frequency domain equalization and synchronization of modulation (such as FQPSK modulation, SOQPSK modulation, CPM modulation and other efficient linear modulations) signals with efficient power and spectrum.

Description

technical field [0001] The present invention relates to a method for carrier phase and symbol synchronization, channel estimation and frequency domain equalization in the communication field, in particular to carrier phase and symbol timing synchronization and fractional channel estimation in a single carrier frequency domain equalization (SC-FDE) communication system and fractional frequency-domain equalization methods, especially suitable for single-carrier frequency-domain equalization of power-efficient, spectrum-efficient modulated signals with carrier phase and symbol timing synchronization. Background technique [0002] Continuous phase modulation (CPM) has the advantages of high power efficiency and high spectrum efficiency, and has been widely used in telemetry communication, satellite communication and mobile communication. FQPSK-JR modulation, SOQPSK modulation and ARTM (Advanced Range Telemetry) CPM modulation are all continuous phase modulation or approximate co...

AI Technical Summary

Problems solved by technology

SC-FDE technology is a technology that enables single-carrier modulation to perform packet transmission and frequency domain equalization against multipath interference by adding a cyclic prefix (CP); Jun Tan et al. and Fabrizio Pancaldi et al. proposed CPM in 2005 and 2006, respectively. frequency domain equalization scheme, but the equalizer structure is complex, the operation complexity is high, and it is difficult for engineering application; although W.Van Thillo proposed the idea of ​​separating the CPM frequency domain equalizer from the AWGN demodulator, the frequency domain equalizer is based on The Laurent decomposition of the CPM signal does not completely separate the matched filter, and cannot perform fractional frequency domain equalization and carrier phase and symbol timing synchronization

Although the non-data-assisted symbol timing estimation algorithm of CPM modulation proposed by Aldo N.D'Andrea in 1996 can be used for symbol timing synchronization of CPM signals under multipath channels, the synchronization time is long, the tracking performance is poor, and it is difficult to synchronize long-frequency pulse CPM signals; The joint carrier phase and timing recovery algorithm proposed by Michele Morelli in 1997 requires decision feedback, takes a long time to synchronize, and has false locking for some response signals

At present, there is no carrier phase and symbol timing synchronization and fractional frequency domain equalization scheme for the single-carrier frequency domain equalization communication system of the above-mentioned power efficient and spectrum efficient modulation methods

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