一种低复杂度OFDMA系统子载波、比特与功率分配算法

Allocation algorithm of sub-carrier,bit and power for low-complexity OFDMA system

针对多用户OFDMA系统提出了一种宽度可调的动态子载波、比特与功率分配算法;在子载波分配上,利用无线信道的频域相关性,对信道信噪比矩阵的列进行压缩;在比特分配上,对贪婪(G reedy)算法改进,利用不同子载波之间信道信噪比的对数关系,将子载波进行分组.仿真结果表明,在相同的通信服务质量(QoS)条件下,该算法显著降低了计算复杂度,发射功率增量很小,具有现实意义.

The paper presents a rapid sub-carrier, bit and power allocation algorithm for multi-user OFDMA system based on adjustable width. The frequency domain correlation of wireless channel is employed to compress columns of the channel SNR matrix for sub-carrier allocation. Furthermore, Greedy algorithm is improved to group sub-carriers by using logarithmic relationship among their channel SNRs for bit allocation. The simulation results show that the new algorithm has less transmission power increase and great complexity reduction under the same QoS condition. It has bright prospect in applications algorithin.