Method for phase and symbol synchronization, channel estimation and frequency domain equalization of SC-FDE system
A technology of SC-FDE and channel estimation, applied in the field of communication, can solve the problems of no carrier phase and symbol timing synchronization, complex equalizer structure, high computational complexity, and achieve carrier phase and symbol timing synchronization and frequency domain equalization, Achieve the effect of carrier phase and symbol timing synchronization and low computational complexity
Active Publication Date: 2009-09-30
NO 54 INST OF CHINA ELECTRONICS SCI & TECH GRP
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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
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[0033] refer to figure 1 , figure 2 , the transmitter and the receiver of the embodiment of the present invention all work in the single-carrier packet transmission mode, and the signal modulation mode of the embodiment adopts CPM modulation; the data packet symbol length is N, and the channel estimation training sequence symbol length is N p , CP symbol length is N cp , the oversampling factor is Q; the maximum symbol length of the channel is L(L≤N cp );
[0034] figure 1 The grouping module 1 in the transmitter is responsible for grouping the bit data stream, adding head and tail return-to-zero bits for each bit data stream grouping, so that the decoder can correctly detect the data; of course, for linear modulation or nonlinear modulation The linear demodulation method does not need to add head and tail return to zero bits.
[0035] The waveform modulation module 2 is responsible for modulating the bit data stream output by the grouping module 1 into a CPM signal wave...
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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...
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Inventor 徐信宋志群
Owner NO 54 INST OF CHINA ELECTRONICS SCI & TECH GRP
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