A performance analysis method for large-scale MIMO systems based on spatial modulation

Abstract

The invention discloses a method for analyzing the performance of a large-scale MIMO system based on spatial modulation. Aiming at the large-scale MIMO system based on spatial modulation, the system model of the system under the transmission-related Rayleigh channel is established, and the effective signal-to-noise ratio is calculated. The probability density function of the effective signal-to-noise ratio gives the approximate expression of the upper bound of the system bit error rate and the asymptotic expression under the condition of high SNR; in addition, according to the asymptotic expression, the diversity degree of the system is also deduced . It is verified by simulation that the performance analysis method proposed by the invention can effectively evaluate the performance of the system.

Description

technical field [0001] The invention belongs to the field of mobile communication, and relates to a performance analysis method of a mobile communication system, in particular to a bit error performance analysis method based on a spatial modulation system in a large-scale MIMO uplink under a correlated channel. Background technique [0002] As the key technology of the fifth-generation mobile communication, massive MIMO technology can provide greater freedom compared with traditional MIMO, and has the characteristics of low power consumption, high energy efficiency, small incoherent interference, and high spatial resolution. Technology has been extensively researched and applied. Spatial modulation technology only activates one antenna for sending signals in each time slot, so it can effectively overcome inter-channel interference. In addition to the constellation symbols sent by the antenna, the serial number of the activated antenna can also "invisibly" transmit informatio...

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Problems solved by technology

[0003] When performing system performance analysis, it is usually assumed that the channel in a massive MIMO system is composed of large-scale fading and small-scale fading, and the large-scale fading follows a lognormal distribution. However, because the lognormal distribution is complicated and difficult to analyze, so far In theoretical research, the large-scale fading is regarded as a fixed value before analysis, which is obviously not enough to accurately describe the channel characteristics

In addition, in the uplink of the massive MIMO system, the user will send information to the base station. Since there is almost no space constraint when arranging the base station, enough distance can be left between the antennas of the base station to eliminate correlation, and the user equipment due to Limited by physical size, it is often impossible to avoid the occurrence of spatial correlation

It can be seen that the correlation of the transmitting end is an important factor affecting the system performance. However, the existing research has not solved the problem of what probability distribution the effective SNR obeys in the massive MIMO system based on spatial modulation under the transmitting correlation channel. No performance analysis proposals for this system have been proposed

[0004] In summary, the existing research lacks a more rigorous channel model for massive MIMO systems, and no performance analysis method for massive MIMO systems based on spatial modulation under transmission-related channels has been proposed.

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