Resource allocation method for multi-cell relay ofdm system with frequency planning

Abstract

The invention aims at providing a multi-cell relay OFDM system resource distribution method with frequency planning. The multi-cell relay OFDM system resource distribution method with the frequency planning is low in complexity. Maximum system capacity serves as the goal of the multi-cell relay OFDM system resource distribution method, the frequency planning is applied, and a model is built under the condition that base stations and relay terminals are limited in transmitted power. The multi-cell relay OFDM system resource distribution method with the frequency planning comprises the following steps that a single cell is divided into three independent regions, different frequency bands are used for different regions, users in the different regions access to relays which are shortest in distance, therefore, distances of the users using the same frequency band between adjacent cells are increased, and then the influence of co-channel interference can be reduced; through self-adaptive distribution of the transmitted power of base station terminals of different regions, eventually system total capacity is decoupled to the sum of capacities of the three regions, and algorithm complexity is reduced; power of the base station terminals is used for representing power of the relay terminals according to DF relay features in the process of analyzing the resource distribution problems of a single region, therefore, an optimization problem in a standard form is converted, and eventually a final solution of the problem is acquired by utilizing multiple plane water injection and loop iteration theories.

Description

Technical field [0001] The present invention relates to a method for resource allocation of a relay-based multi-cell OFDM system, in particular to a method for resource allocation of a multi-cell relay OFDM system with frequency planning, and belongs to the field of communication technology. Background technique [0002] Relay technology has great potential in increasing wireless coverage, eliminating coverage blind spots, saving terminal power, and improving the communication quality of cell edge users. As one of the key technologies of future mobile communication systems, advanced relay technology has been used in various fields. In-depth research and lively discussions were launched among major research institutions, equipment vendors and operators. From the function of the relay node, the relay communication can be divided into two categories, namely, Amplify-and-Forward (AF) relay and Decode-and-Forward (DF) relay; in AF mode, medium The subsequent node only performs simple...

AI Technical Summary

Problems solved by technology

Many institutions have conducted research on the resource allocation of OFDM relay systems, but most of them are limited to the resource allocation of a single cell. The interference between cells in the actual system is one of the main reasons that affect the overall system performance. One of the factors that cannot be ignored in the allocation process, interference cancellation and interference coordination technology will also become the main way to improve system performance in the future, so the current research on resource allocation for OFDM relay systems is mostly based on multi-cell, multi-relay, User's System Model

Although these researches on multi-cell resource allocation problems can obtain solutions to the problem, the complexity is relatively high, mainly because the resource allocation process includes subcarrier pairing, subcarrier allocation, and corresponding power allocation. The method of cyclic iteration and multi-plane water injection is required. The huge carrier base and dense user group make the complexity of the calculation increase sharply, which poses a serious challenge to the performance improvement of the high-speed wireless communication system.

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