Multi-dimensional resource optimization algorithm for incremental AF-OFDM cooperative network

Abstract

The invention belongs to the technical field of cooperative transmission, and discloses a multi-dimensional resource optimization algorithm for an incremental AF-OFDM cooperative network. The algorithm comprises the steps: obtaining the channel state information of all subcarriers in all time slots; building an optimization model which takes a network service life m as the target according to a multi-dimensional resource optimization algorithm, calculating the optimal power distribution on all subcarriers in all time slots, determining optimization variables in a transmission process: incremental strategy, subcarrier pairing and relay selection; enabling a source to broadcast data on each subcarrier in the first time slot in a transmission process of useful data through the calculated power, enabling a relay and a target node to receive the data, determining a transmission strategy of the second slot according to the incremental strategy, i.e., enabling the selected relay to transmit the information to the target node on the paired subcarrier through the calculated power; or enabling the source to transmit new data to the target node on the paired subcarrier through the calculated power. The method improves the spectrum utilization rate, effectively employs the limited energy, spectrum and equipment resources.

Description

technical field [0001] The invention belongs to the technical field of cooperative transmission, and in particular relates to an algorithm for optimal allocation of multi-dimensional resources of an incremental AF-OFDM cooperative network. Background technique [0002] At present, in energy-constrained relay cooperative networks, resource allocation schemes in cooperative transmission mode have considered power allocation on multiple carriers, or jointly considered power allocation and relay selection strategies, or jointly considered power allocation and Subcarrier pairing, or joint consideration of power allocation and relay selection strategies, subcarrier pairing to achieve system energy efficiency or maximize system performance. The transmission technology scheme generally adopts amplification and forwarding AF, decoding and forwarding DF or hybrid amplification and decoding. For the code forwarding protocol, most of the optimization models established are general conve...

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Problems solved by technology

[0003] However, there are some problems in the existing technical solutions: only considering power allocation, relay selection, and one or several optimization variables in subcarrier pairing cannot achieve the optimization goal to the greatest extent; the existing technical solutions are under the condition of limited energy Considering that it is necessary to maximize system energy efficiency or system performance, it is also critical to extend network life; using traditional forwarding protocols, due to the half-duplex characteristics of relays, spectral efficiency will be halved, although system performance improved, but the spectral efficiency decreased; due to the consideration of fewer optimization variables, it is simple to establish a mathematical optimization model, although a small number of technical solutions use the Lagrangian dual problem to solve non-convex optimization problems, but the original problem has not been transformed Concrete and in-depth verification of the condition for solving the dual problem, that is, the theory that the dual gap is zero

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