面向两层小区网络的两级跳频多址接入技术研究

为了抑制异构多层通信网络的多层干扰并保证多级服务质量(Quality of Service, QoS)需求，提出了一种新型跳频多址接入(Frequency Hpping Multiple Access, FHMA)技术。首先基于传统伪随机FH序列和数学变换给出了一类具有两级汉明相关的FH图案(FH序列集)设计方法，然后在两层小区上行链路中对采用这类FH序列的OFDM/FHMA系统的抗干扰性能和频谱效率进行了研究。信号分析和仿真结果表明，所提出的FHMA方案可以缓解两层小区的用户干扰，降低系统传输误码率(Bit Error Rate, BER),同时保证两层用户的差异化传输质量(两级BER性能和频谱效率)。该FHMA技术能够满足两层干扰抑制和多级服务质量的设计目标，这是传统伪随机FH技术难以实现的。

Two-level frequency hopping multiple access(FHMA) technique for two-tier cellular networks

To mitigate the multi-tier interference and guarantee the multi-level quality of service(QoS) in heterogeneous multi-tier networks,a new frequency hopping multiple access(FHMA) technique is proposed.Firstly,a construction algorithm of the two-level Hamming correlations FH pattern(FH sequence set) is proposed based on the traditional pseudo-random FH sequence and mathematical transformations.Then,in the uplinks of two-tier cells,the performance of interference mitigation and spectral efficiency of OFDM/FHMA system which adopts the proposed FH sequence is investigated.The signal analysis and simulation results show that the proposed FHMA technique can relieve the impact of two-tier cell user interference so as to decrease the bit error rate(BER) and also guarantee the differential transmission QoS for two-tier users(two-level BER and two-level spectral efficiency).The proposed FHMA technique can satisfy the design targets of two-level interference mitigation and multi-level QoS,while the traditional pseudo-random FH technique cannot.