Multiple access method and system of multiple application scene signals

Abstract

The invention provides a multiple access method (F-BFDM) and a system thereof applicable to multiple application scene signals in wireless communication. The method comprises the following steps of: firstly performing a fast Fourier transform (FFT) change to each path of signals at a transmitting end to configure the signals to the allocated frequency bands, then pre-filtering to reduce the peak-to-average power ratio (PAPR) of a modulated signal, modulating the filtered signal onto a subcarrier by a cyclic Fourier transform (CCIDFT), combining the modulated signals of each path, and transmitting the combined signals to a channel together with a cyclic prefix (CP). The signal of each path in the invention corresponds to an application scenario, the complete reconstruction of the system iscompleted by the CCDFT at the receiving end, and the CCDFT is implemented by a bi-orthogonal filter bank. By freely designing a prototype filter, the interference of multiple application scene signalsfor multiple accessing can be minimized, so that the signal of each path can be accessed without interference under the situation that no isolation band exists, and the spectral efficiency can be maximized.

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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