Uplink non-orthogonal multiple access transmission method and system

Abstract

The invention provides an uplink non-orthogonal multiple access transmission method. The method comprises the following steps: carrying out bit-level interleaving processing on terminal service information subjected to channel coding by adopting a shifting mode; performing constellation modulation, and mapping the bit information into symbol information according to different modulation modes; carrying out symbol-level sequence expansion, carrying out expansion sequence processing on modulation symbols of M users, and multiplexing the modulation symbols on K subcarriers, wherein M > K; and scrambling the expanded data to distinguish different base stations. Non-orthogonal multiple access is introduced on the basis of a time domain, a frequency domain and a space domain, new diversity gain is brought, and more users can be accessed on the same time / frequency / space domain resource at the same time through reasonable resource mapping and multiplexing and adjustment of power and user combination between terminals; therefore, the system capacity and the system throughput are improved, and the scheduling waiting time of the user is shortened; meanwhile, a new scrambling mode is adopted, the system safety is enhanced, and the user experience is improved.

Description

technical field [0001] The invention belongs to the technical field of wireless communication and broadcasting, and in particular relates to an uplink non-orthogonal multiple access transmission method and system. Background technique [0002] In traditional wireless communication, uplink user access mostly adopts orthogonal multiple access technology, such as time division multiple access (TDMA, Time Division Multiple Access), frequency division multiple access (FDMA, Frequency Division Multiple Access) and Space Division Multiple Access (SDMA, Space Division Multiple Access). These orthogonal multiple access methods essentially divide channel bandwidth / symbol resource rows orthogonally to obtain a plurality of mutually orthogonal sub-channels, and each sub-channel occupies a part of multiple access channel resources for signal transmission. [0003] These orthogonal multiple access technologies can play a normal role when the number of scheduled users is small, but as the...

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Problems solved by technology

[0003] These orthogonal multiple access technologies can play a normal role when the number of scheduled users is small, but as the number of users increases, such as in a two-way broadcast system, due to the large coverage and large number of users, there will be problems such as insufficient resources. , resulting in a greatly reduced scheduling effect, or even failure to schedule, thereby reducing network capacity and system throughput, reducing user scheduling delay, greatly increasing system delay, and deteriorating user experience

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