Low-complexity super-Nyquist transfer method

Abstract

The invention discloses a low-complexity super-Nyquist transmission method. Information sequence is Gaussian pulse shaped and performs super-Nyquist code element speed transmission, a receiving end uses a gaussian pulse shaping filter matched with a transmitting end to perform matching filter on a received signal, and the receiving end performs sampling on output of a matching filter with the same super-Nyquist sampling rate with the transmitting end. The maximum likelihood sequence estimation (MLSE) is performed on a sampling signal to compensate the intersymbol interference (ISI) of the receiving signal, soft value output information is obtained, and the system bit error rate (BER) performance can be further improved through performing iteration exchange on prior soft value information between a channel decoder and a FTN equalizer. The adopted gaussian shaping pulse can make the FTN transmission system ISI tap energy to rapidly decay, the MLSE equalization algorithm is adopted, only less ISI tap amount can acquire quasi-optimal BER performance, and the system realization complexity is greatly reduced.

Description

Technical field [0001] The present invention belongs to wireless communication technology, and specifically relates to a waveform design problem under the low-complexity signal detection condition of a super-Nyquist transmission system. Background technique [0002] Faster-than-Nyquist (FTN) transmission is a wireless communication technology that efficiently utilizes spectrum resources. Under the same bandwidth conditions, it can achieve a high transmission rate that breaks the limit of traditional Nyquist transmission without causing the loss of system error performance. It is precisely because of this feature that the ultra-Nyquist transmission technology is affected by the current wireless Extensive research and attention in the field of communications. Banelli and Buzzi mentioned in "Modulation Formats and Waveforms for 5GNetworks: Who Will Be the Heir of OFDM?" in IEEE Signal Processing Magazine Vol. 36, Issue 6, pages 80-93 in July 2014 that FTN transmission technology ha...

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Problems solved by technology

Since the sinc pulse sidelobe attenuation is too slow, it is not suitable for practical communication systems, so the current research on super-Nyquist transmission systems is mainly based on root-raised cosine pulses, and McGuire and Sima in December 2010 in IEEE Global Telecommunications In the article "DiscreteTime Faster-Than-Nyquist Signaling" on pages 1-5 of the Conference, it is pointed out that one of the main problems hindering the commercialization of FTN technology is the high complexity of signal detection.

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