OFDMA-Based Resource Allocation In The Wireless Relay System

With the rapid development of wireless technology, the relay technology has become more and more concern, LTE_Advanced has decided to introduce the relay technology, the relay technology can expand coverage, increased system capacity and additional blind spot coverage, etc.. OFDM and OFDM A are the key technologies in the B3G and 4G, OFDM can be anti-multipath and intersymbol interference, can more efficient use of bandwidth resources. OFDMA-based resource allocation can achieved multiuser diversity benefit. OFDMA-based relay resources allocation in the wireless relay system is becoming more and more popular in recent years.OFDMA-based relay system focus on the allocation of resources, mainly in sub-carrier allocation, time slot allocation and power allocation. This study focused on sub-carrier allocation and time slot allocation. Our research is different from the existing research:in this paper, subcarrier allocation and reuse is dynamic. First, according to the business relationship between the relay, we divided the model into two categories: non-uniform and uniform business, according to two different business models, separately proposed the resources allocation in different ways. For non-uniform business model, with equal portions slot and no reuse frequency resource, and presents a user satisfaction based subcarrier allocation algorithm, simulation results show that the algorithm can effectively enhance the system user satisfaction, more revenue for the system. As for the uniform business model, as unequal slot allocation, the reuse factor is 3,dynamic allocation and reuse of subcarriers resources. By the subcarrier allocation then decided the two time slots. Simulation results show that the dynamic resource allocation can improve the effective of resource and can effectively enhance the capacity of the system.