HFC上行信道噪声对调制方式影响的研究  

Study on the Influence of the Noise in Upstream Channel of HFC-CATV Networks on the Modulation Techniques

作　　者：姜萍[1] 花汉兵[1] 王建新[1] 

机构地区：[1]南京理工大学 电子工程与光电技术学院,江苏南京210094

出　　处：《电视技术》2007年第B08期94-96,共3页Video Engineering

摘　　要：根据HFC网络上行信道的特性,建立了信道模型;分析了上行信道中存在的各种噪声对QPSK和16QAM两种调制方式的影响。结果表明在C/N较低的情况下,采用QPSK调制方式,可提高系统的抗干扰能力;对于C/N较高的网络,采用16QAM调制方式,可取得较高的传输速率。This paper establishes the channel model according to the properties of the upstream channel of HFC networks. It also studies how various noises in the upstream channel of HFC networks affect the two modulation techniques of QPSK and 16QAM. It is demonstrated that, when C/N is low, the anti-jamming ability of the system can be improved if QPSK is adopted, whereas high transmission rate can be acquired if 16QAM is applied when C/N is high.

关 键 词：光纤同轴电缆混合网 上行信道 正交(四相)相移键控 正交调幅 噪声 

分 类 号：TN915.62[电子电信—通信与信息系统]