Spatial domain and power domain joint multiple access method and system based on signal virtual decomposition

Abstract

The invention discloses a spatial domain and power domain joint multiple access method and system based on signal virtual decomposition, the system comprises a plurality of expected transmitters, a harmonic transmitter and a common receiver, and the common receiver and all transmitters share channel state information. A harmonic transmitter obtains an orthogonal basis through traversal to minimize harmonic power, shares the orthogonal basis to an expected transmitter and a common receiver, and solves harmonic signals by taking spatial features represented by basis vectors contained in the orthogonal basis as directions of multiple paths of expected signals, so as to obtain multiple paths of expected signals. The expected transmitter determines a matched filtering vector of the receiving end according to the orthogonal basis, calculates expected data gain and sends the expected data gain to the receiving end, the harmonic signal interacts with the actual sending signal at the receiving end, the common receiver filters the mixed signal, and then the expected data gain is divided by the filtering output to obtain expected data. Therefore, the common receiver recovers multiple paths of expected data from the received mixed signal without interference.

Description

technical field [0001] The invention belongs to the technical field of communication, and further mainly relates to a multiple access method, in particular to a joint multiple access method of space domain and power domain based on signal virtual decomposition. Background technique [0002] Multiple access technology is applied to wireless communication systems to enable multiple users to share limited system resources. From the first generation to the fourth generation of mobile communication systems, multiple access technology has experienced frequency division multiple access (Frequency Division Multiple Access, FDMA), time division multiple access (Time Division Multiple Access, TDMA), code division multiple access (Code Division Multiple Access) , CDMA) and Orthogonal Frequency Division Multiple Access (OFDMA). Continuously developing multiple access techniques are used to improve the system's spectrum efficiency and resource utilization efficiency. After the mobile c...

AI Technical Summary

Problems solved by technology

Compared with IN, IS power overhead is reduced, but it needs to consume space degrees of freedom (Degree of Freedom, DoF) to place guided interference, which is similar to IA

[0004]The problem existing in the prior art is: the resource utilization rate of the multi-access mode that differentiates user communication by frequency, time, code and space, etc. is low, and cannot adapt to the growing communication needs

Although NOMA and VSDMA can significantly improve the spectrum resource utilization of the system, since the receiver uses SIC in NOMA, its complexity and processing delay increase, and SIC has the problem of error propagation, while VSDMA has the problem of extracting transmitter power consumption oversized problem

[0005]The difficulty and significance of solving the above technical problems: When there are multiple users with communication needs in the system, there will be mutual interference between the concurrent transmissions of multiple users, which will Affecting the receiving effect of the receiver (such as an increase in the bit error rate), how to manage the interference between multiple user communications with low resource overhead and realize multiple access is a problem worth studying

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