An improved resource allocation method for decode-and-forward relay communication system

Abstract

The invention discloses an improved decoding forwarding relay communication system resource distribution method, comprising: first establishing an improved decoding forwarding relay communication system resource distribution model; determining whether the transmission mode of each subcarrier pair is direct transmission or relay transmission, and determining the forwarding relay set corresponding to each subcarrier pair having a transmission mode of relay transmission; obtaining a power optimal solution through establishing the lagrangean function of the improved decoding forwarding relay communication system resource distribution model; calculating the transmission rate contribution value corresponding to each subcarrier pair according to the power optimal solution; and finally determining subcarrier pairs according to the transmission rate contribution value corresponding to all subcarrier pairs by utilizing a Hungary algorithm. The method fully utilizes the silence period and null sub-carriers of a second time slot base station, and adaptively adjusts subcarrier pair coupling and relay selection, thereby maximizing a frequency spectrum utilization rate, and maximizing the system capacity under fixed total power.

Description

technical field [0001] The invention relates to a communication system resource allocation technology, in particular to an improved decoding and forwarding relay communication system resource allocation method. Background technique [0002] OFDM (orthogonal frequency division multiplexing) technology has the advantages of high spectrum utilization, strong anti-fading capability, flexible resource allocation and high transmission rate, and has become a key technology for current and future mobile communications. At the same time, as a key technology of LTE-A, relay technology can ensure high coverage of the communication system and service quality of cell edge users. Research on resource allocation in OFDM-based relay communication system mainly involves relay selection, subcarrier allocation and power allocation. A reasonable resource allocation algorithm can effectively improve the utilization efficiency of communication system resources. Therefore, the resource allocation...

AI Technical Summary

Problems solved by technology

For the improved decoding-and-forwarding relay communication system model, some corresponding resource allocation methods have been proposed. However, when these resource allocation methods select the forwarding relay, some resource allocation methods only select one optimal subcarrier pair in one transmission process. An optimal relay completes the forwarding of information, and the space diversity gain is low; some resource allocation methods do not take into account the difference between the front and rear time slot channels, and select the same subcarrier to transmit information in two processes of one transmission, which makes the spectrum lower utilization

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