OFDM relay network resource allocating method based on the information-and-energy-simultaneous-wireless-transmission

Abstract

The invention discloses an OFDM relay network resource allocating method based on the information-and-energy-simultaneous-wireless-transmission. This method constructs an optimization model for the system throughput under the condition that the peak power of a source node is restricted, the peak power of each subcarrier is restricted and the energy causality of the relay node is restricted. In the case that the subcarrier allocation strategy of the source node is given, the optimal criteria for the original problem are sought. Then, through the arrangement of the general energy transmission power of the source node, the original problem is decoupled as two separate sub-problems of the maximization of the throughput, which reduces the complexity of the original problem for solutions considerably. The decoupled sub-problems are then solved according to a water injection manner. Finally, the invention provides four subcarrier allocation schemes, referred to as the energy optimizing scheme, the information optimizing scheme, the equilibrium allocation scheme and the exhaustion scheme with the first three schemes reducing the complexity of the sub-carrier allocation significantly.

Description

technical field [0001] The invention discloses an OFDM relay network resource allocation method based on simultaneous wireless information and power transfer (SWIPT) and belongs to the technical field of wireless communication. Background technique [0002] SWIPT refers to using the same radio waves to transmit information and energy to the receiving end, and the receiving end can use them to decode information and collect energy respectively, thereby prolonging the life cycle of energy-constrained devices, reducing charging costs, and improving the performance of wireless networks . There are currently two mainstream SWIPT strategies: power splitting (power splitting, PS) SWIPT strategy and time switching (time switching, TS) SWIPT strategy. The power division SWIPT strategy refers to dividing the power sent by the sender into two parts according to a certain ratio coefficient, and the receiver uses the two parts of power for decoding information and collecting energy resp...

AI Technical Summary

Problems solved by technology

[0005] 1) This method does not consider the power output capability of each subcarrier: in a certain time slot, it is possible to allocate a very large power to a certain subcarrier of the source node, which is unreasonable in reality

[0006] 2) Relay nodes are not included: each time slot energy access point only selects some subcarriers to transmit energy to the source node, but cannot transmit information

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