A joint optimization method of multi-user mimo uplink spectral efficiency with electromagnetic radiation constraints

Abstract

The invention discloses a joint optimization method for multi-user MIMO uplink spectrum efficiency and efficiency with electromagnetic radiation constraints. In this method, the electromagnetic radiation measurement standard adopts the electromagnetic wave absorption ratio SAR. By using the statistical state information of the channel, the method optimally designs the covariance matrix of the signals sent by each user, so as to maximize the weighted sum of spectral efficiency and energy efficiency under the premise of satisfying power constraints and local exposure constraints of electromagnetic radiation. Among them, the design of the algorithm mainly uses the deterministic equivalence principle, quadratic transformation, variable relaxation and iterative water injection algorithm. The method of the invention has low complexity. When the electromagnetic radiation coefficient of each user and the statistical channel information between the user and the base station change, the user terminal can dynamically implement a transmission method that satisfies the weighted and maximized spectral efficiency under the constraint of electromagnetic radiation, and optimizes the Get the covariance matrix of the transmitted signal.

Description

technical field [0001] The invention belongs to the field of communications, and in particular relates to a transmission method for joint optimization of multi-user MIMO uplink spectrum efficiency under the constraint of electromagnetic radiation using statistical channel state information. Background technique [0002] Electromagnetic (EM) exposure refers to exposure caused by the propagation of electromagnetic waves, usually associated with the use of various electronic devices, artificial light, and other natural activities such as sunspot activity. The rapid growth of wireless communications over the past few decades has made it one of the most important sources of electromagnetic radiation for the public. In particular, as IoT technology spreads across fifth-generation networks, the proliferation of wirelessly connected devices will make people more vulnerable to high doses of electromagnetic radiation. [0003] Studies have shown that excessive electromagnetic radiati...

AI Technical Summary

Problems solved by technology

However, today's communication systems typically employ multi-antenna cellular devices to increase the spectral efficiency of the uplink, where previous power backoff algorithms become inefficient

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