Research Of Power Allocation Algorithm In Cooperative Communication Based On Sum-rate

With the advent of the mobile Internet era, people’s data transfer rates have become increasingly demanding, network spectrum resources are also increasingly tense. Cooperative communication technology can not only overcome multipath fading and reduce inter-cell interference, but also to obtain diversity gain, effectively improve the transmission rate, which attracted much attention, it has become a hot research.Cooperative communication technology is divided into two categories, one is a relay collaboration technology, when the source node and the destination node from a distance, the source node need to use a relay node completes transmission of information. In order to overcome the shortcomings of traditional relay low spectral efficiency of this collaboration technologies, the current two-way relay technology has become a hot research. Another technique is coordinated multipoint(Coordinated Multiple Point), a plurality of base stations while providing diversity gain for the user within the coverage area of the inter-cell interference into useful signal, thus effectively improving the service quality of the cell edge. In order to meet the International Telecommunication Union for the fourth generation mobile communication technology indicators, LTE_A relay collaboration technologies and multi-point collaboration technologies into its key technology.Data transfer rate is the most important measure of the performance of the communication system. This paper studied the data transfer rate of coordinated multi-point technology and collaboration technologies under the relay.In the relay mode of collaboration technologies, research under way relaying model of how to improve the system transmission rate problem. To further enhance the two-way relay transmission system transmission rate is proposed to enlarge the relay node forwards the selection criteria and the corresponding optimal powerallocation scheme based on. The relay transmission system total transmission power is limited as constraints to maximize the total rate system as the objective function, the node selection and power allocation as a procedural abstraction optimization problem. Since the original problem is rather complicated, it is converted to minimize noise ratio of the two links and reciprocal problems and derive optimal power distribution. Theoretical analysis found that the overall rate system with only two total transmit power and channel coefficients reciprocal links and relevant. Based on this, two links have been minimized and reciprocal channel coefficients relay node selection criteria. The simulation results show that the relay selection and power distribution joint programs not only low complexity, and can effectively improve the overall rate of relay transmission system.In the coordinated multi-point technology model to study how to balance transfer rate and user fairness. The ratio of the system, the maximum user rate and minimum user rate is set at a fair factor, the fairness factor, the lower the better the system is fair.In the ratio of the average rate and equity factors maximize the system as the goal,power allocation, improve the average transmission rate while taking into account the fairness of the system users. Numerical results show that, compared with an equal power allocation scheme, the newly proposed scheme can not only improve the average transmission rate of the system, the user can also improve fairness.