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.
出处
《电视技术》
北大核心
2007年第B08期94-96,共3页
Video Engineering
