Robustness gaming power control method under imperfect CSI for multi-user OFDMA relay system

Abstract

The invention provides a robustness gaming power control method under imperfect CSI for a multi-user OFDMA relay system. The robustness gaming power control method converts a power control problem of a user into a noncooperative gaming problem. In consideration of the channel estimation error condition and on the premise of satisfying the power transmission constraint for users and the interruption probability constraint, the users compete with each other by controlling the emission power so as to maximize the self capacity. Based on a worst-case robustness resource distribution strategy, the algorithm takes the influence of the robustness gaming power control research channel estimation error of the worst channel estimation error on the network performance into account, and then establishes a corresponding network capacity maximization model. The existence and the uniqueness of nash equilibrium of robustness gaming is analyzed and proved, and a distributed robustness power control algorithm is further proposed to improve the network capacity. The simulation result shows that the robustness power control algorithm enables the users to get better performance and can effectively reduce occurrence of interrupt events in the system and belongs to an effective algorithm.

Description

technical field [0001] The invention relates to a power control technology under imperfect CSI in an OFDMA relay network, in particular to a method for controlling transmission power of multiple users and multiple relays on different channels. Background technique [0002] In a wireless network, the relay technology can greatly increase the transmission rate of the network, reduce the communication delay in the network, reduce the transmission power and expand the coverage of the network. Therefore, in recent years, research on relay network technology based on Orthogonal Frequency Division Multiple Access (OFDMA) system is of great significance and extremely challenging. For example, the multi-hop or multi-relay network under the OFDMA system is more complicated than the traditional single-hop or single-relay OFDMA network, and issues such as power allocation between relays and users need to be further considered. [0003] At present, most scholars study joint power alloca...

AI Technical Summary

Problems solved by technology

However, in practical networks, the channel estimation error will make the channel state information (CSI) of the base station (BS), relay and user on the link not completely correct

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