Angle-Delay Domain Pilot Multiplexing Wideband Massive MIMO Communication Method

Abstract

The invention provides an angle-time delay domain pilot frequency multiplexing broadband mass MIMO (multiple input multiple output) communication method. The method includes that a base station wirelessly communicates with multiple subscribers on each subcarrier; a probe sequence of each subscriber is generated via a same constant modulus sequence by means of frequency domain modulation, the different subscribers send uplink probe signals on multiple subcarriers of one or more continuous OFDM (orthogonal frequency division multiplexing) symbols simultaneously, and the base station acquires angle-time delay domain two-dimensional statistics channel information according to the uplink probe signals and determines pilot frequency modulation factors of all the subscribers according to the angle-time delay domain two-dimensional statistics channel information; a pilot frequency sequence of each subscriber is generated via the same constant modulus sequence by means of frequency domain modulation, the different subscribers send uplink pilot frequency signals on the multiple subcarriers of the one or more continuous OFDM symbols simultaneously, and the base station acquires channel estimation values of a pilot frequency band and a data segment of each subscriber according to the uplink pilot frequency signals; on each subcarrier, the base station implements uplink and downlink robust transmission according to the channel estimation values and estimation error space correlation matrixes. By the method, system pilot frequency overhead can be lowered, and system frequency spectrum and power efficiency is improved.

Description

technical field [0001] The invention relates to a wideband massive MIMO wireless communication method using multiple antennas, in particular to a wideband massive MIMO wireless communication method for angle-delay domain pilot multiplexing. Background technique [0002] The massive MIMO wireless communication technology equipped with a large-scale antenna array on the base station side can deeply utilize the spatial dimension resources of the wireless channel. Compared with the traditional small-scale MIMO technology, it can further improve the effectiveness and reliability of the wireless communication system. widespread attention in the world. The actual wireless propagation channels are all broadband channels, and Orthogonal Frequency Division Multiplexing (OFDM) technology can decompose the broadband channel into multiple parallel narrowband channels. Massive MIMO combined with OFDM is one of the development trends of the next generation broadband mobile communication sy...

AI Technical Summary

Problems solved by technology

For massive multi-user MIMO-OFDM wireless communication systems, there are a large number of channel parameters to be estimated, which will lead to a large amount of pilot overhead

At the same time, linear minimum mean square error channel estimation requires high-dimensional matrix inversion operation, which is complex to implement

The complexity of pilot overhead and channel estimation becomes the bottleneck of massive MIMO-OFDM wireless communication

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