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NOMA system based on multi-wavelet pulse forming

A technology of pulse shaping and multi-wavelet, which is applied in the field of NOMA communication to achieve the effect of improving transmission reliability and BER performance

Active Publication Date: 2019-08-09
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, most of the wavelet modulation applied to the communication system is in the form of multi-carrier modulation. For example, the discrete wavelet transform-based orthogonal frequency division multiplexing technology (Wavelet filter bank based OFDM, WOFDM) has been used as a pulse shaping method. Alternative technologies are introduced into NOMA communication transceivers, but how to perform pulse shaping in NOMA communication based on multi-wavelets remains to be further studied

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Embodiment

[0057] In order to better illustrate the technical solutions and technical effects of the present invention, two pairs of sending and receiving users are taken as examples to simulate and verify the present invention.

[0058] In this simulation verification, a common downlink communication system model is considered. Suppose there is a base station responsible for transmitting the signals of 2 pairs of users, and the total power of the sending end is P T . p i Indicates the power of the i-th sending user i=1, 2, S i Indicates the signal sequence to be sent by the i-th sending user, α i is the power allocation factor of the i-th sending user, satisfying P i = α i P T ,in S i (t) is the discrete signal sequence of the i-th sending user before power allocation, so the transmission signal after power superposition at the sending end can be expressed as:

[0059]

[0060] Assume n i (t) is the noise received by the i-th sending user, and n i (t)~CN(0,N 0), N 0 Rep...

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Abstract

The invention discloses a NOMA system based on multi-wavelet pulse forming. At a sending end of the NOMA system, after signal mapping and OFDM modulation processes are respectively carried out on transmission signals, a plurality of filters obtained based on a plurality of wavelets are utilized to respectively carry out pulse forming on different sending users, and then power distribution and signal superposition are carried out to integrate and carry out low-pass filtering on the signals of the sending users and then send the signals; at a receiving end, firstly, low-pass filtering is carriedout, then matching filtering is carried out on different receiving users by adopting matching filters corresponding to sending users through corresponding SIC processes, and after OFDM demodulation and signal demapping, a transmission signal is recovered. According to the invention, the BER performance of the NOMA system can be effectively improved, and the improvement is less influenced by the power distribution ratio, so that the transmission reliability of the NOMA system and the practical feasibility of the NOMA technology are improved.

Description

technical field [0001] The invention belongs to the technical field of NOMA communication, and more specifically relates to a NOMA system based on multi-wavelet pulse shaping. Background technique [0002] The booming 5G business puts forward higher requirements on the rate, delay, number of connections, and communication quality of next-generation mobile communications. The user access capability of the existing 4G mobile communication system based on OMA technology (Orthogonal Multiple Access, Orthogonal Multiple Access) is limited by the orthogonality requirements of time slots, frequency bands and codewords, and cannot meet the requirements of the 5G era. Such potential application prospects require a large number of concurrent access. NOMA (Non-orthogonal Multiple Access) technology is one of the key technologies in 5G communication research. At the sending end, NOMA technology allocates different transmit power to different users, and multiple users share the same ti...

Claims

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Application Information

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IPC IPC(8): H04L25/03H04L27/26
CPCH04L25/03834H04L27/2627H04L27/2649
Inventor 王茜刘瑶阎啸吴孝纯尹春雨
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA