Strictly band-limited efficient modulating system based on impact filter forming

Abstract

The invention discloses a strictly band-limited efficient modulating system based on impact filter forming. An emitting end of the system comprises a molding filter which is used for realizing a strictly band-limited communication system and improving spectrum efficiency of the system signal by reducing signal bandwidth, wherein the molding filter is an impact filter; a receiving end of the system adopts an optimal receiver which takes a pre-stored impact waveform sample sequence obtained by an expanded jumping part of the molding filter as a correlation operation template or matching filter impulse response to respectively perform matched filtering with a MPPSK receiving signal of an existing code element received by the receiving end to demodulate a corresponding sending code element after sliding fixed step length to an impact appearing position of the code elements [1,2, ...., M]; the system sending end sufficiently applies an resonance effect of the impact filter, so that the interference effect between the strictly band-limited system codes is small, the structure is simple, the complexity is low, the frequency efficiency is high and the demodulating performance is good.

Description

technical field [0001] The invention belongs to the field of information demodulation in communication systems, and relates to a digital communication system, in particular to a strict band-limited high-efficiency modulation system based on improved MPPSK pulse modulation. Background technique [0002] 1. Strict band-limited high-efficiency modulation system [0003] 1) Research Status [0004] All over the world, telecom operators are accelerating the deployment of 4GLTE networks, but they all face a major problem: the shortage of spectrum resources. As a result, the frontier of competition in the LTE industry has evolved into a battle for superior spectrum resources. According to an authoritative forecast, the 4G spectrum gap will reach 1035-1455MHz by 2020. It can be seen that in today's extremely tight spectrum resources, not to mention the sky-high price of spectrum price auctions, it is difficult to buy the most favorable frequency points and bandwidth in my country...

AI Technical Summary

Problems solved by technology

[0004] All over the world, telecom operators are accelerating the deployment of 4GLTE networks, but they all face a major problem: the shortage of spectrum resources

[0010] 3) Deficiencies and improvements

However, there has always been controversy over whether ultra-narrowband transmission is real and feasible

The focus of controversy lies in pointing out that the modulated symbol information in this mode exists in a wider frequency spectrum. When the side lobes of the signal spectrum components are attenuated, sufficient modulation information is also discarded, so it cannot be correctly demodulated.

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