A method and system for multi-application scenario signal multiple access access

Abstract

The present invention proposes a multiple access method (F‑BFDM) and system suitable for signals in multiple application scenarios in wireless communication. Pre-filtering to reduce the power peak-to-average ratio (PAPR) of the modulated signal, the filtered signal is modulated to the subcarrier by cyclic inverse Fourier transform (CCIDFT), and the modulated signals are combined and sent to the channel with a cyclic prefix (CP) . In the present invention, each signal corresponds to an application scene, and the complete reconstruction of the system is completed by the CCDFT at the receiving end, and the CCDFT is realized by a bi-orthogonal filter bank. Free design of prototype filters can minimize the interference of multiple access signals in different application scenarios, so that each signal can be accessed without interference without isolation bands, and the spectrum can be maximized. utilization rate.

Description

technical field [0001] The present invention relates to multiple access technology, in particular to a filter bi-orthogonal frequency division multiple access method (F-BFDMA). Background technique [0002] Multi-user (multiple access) access is an indispensable part of the wireless communication system. In the fourth-generation mobile communication network represented by the LTE standard, the uplink adopts single-carrier frequency-division multi-user access technology (SC-FDMA). Downlink adopts Orthogonal Frequency Division Multiplexing Multi-User Access Technology (OFDMA). But these two multiple access technologies are only suitable for multi-user access in a single application scenario, such as traditional voice data communication. The main driving force for future mobile communication development is the Internet of Things (IoT) and machine-to-machine communication (M2M), such as in-vehicle communication. The next-generation wireless communication network is characteriz...

AI Technical Summary

Problems solved by technology

However, f-OFDM has several problems. First, the modulation of each signal in f-OFDM continues to use OFDM modulation. Because OFDM has the disadvantages of high PAPA, sensitivity to carrier drift (CFO) and slow attenuation of out-of-band power spectral density, etc., OFDM does not meet the requirements of 5G for the modulation system, because the 5G modulation system requires low PAPR, low CFO sensitivity and high out-of-band power spectral density attenuation; secondly, due to the need for filtering, each OFDM modulation symbol in f-OFDM continues Using CP, the maintenance of CP greatly reduces the spectrum utilization of the entire system. These two shortcomings make f-OFDM unsuitable for 5G multi-scenario signal access

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