Method for phase and symbol synchronization, channel estimation and frequency domain equalization of SC-FDE system
A SC-FDE and channel estimation technology, applied in the field of communication, can solve the problems of no carrier phase and symbol timing synchronization, complex equalizer structure, high computational complexity, etc., to 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: 2011-09-21
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
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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[0033] Reference figure 1 , figure 2 , The transmitter and receiver of the embodiment of the present invention work in a single-carrier packet transmission mode, the signal modulation method in 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 multiple 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 zero-return bits to each bit data stream grouping, so that the decoder can detect the data correctly; of course, for linear modulation or nonlinear modulation The linear demodulation method does not need to add end-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 waveform to form a CPM modulation signal group.
[0036...
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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, multipathinterferences 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 carrier phase and symbol synchronization, channel estimation and frequency domain equalization method in the communication field, in particular to the carrier phase and symbol timing synchronization and fractional multiple channel estimation of a single carrier frequency domain equalization (SC-FDE) communication system And the fractional octave frequency domain equalization method is particularly suitable for single-carrier frequency domain equalization of power-efficient and spectrum-efficient modulated signals to synchronize carrier phase and symbol timing. 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 communications, satellite communications and mobile communications. FQPSK-JR modulation, SOQPSK modulation and ARTM (Advanced Range Telemetry) CPM modulation, etc. are all continuous phase modu...
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IPC IPC(8): H04L25/03H04L27/26
Inventor 徐信宋志群
Owner NO 54 INST OF CHINA ELECTRONICS SCI & TECH GRP
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