【摘要】 对DMB-T单频网进行了数学建模,采取分区分块算法,并考虑了地球曲率的影响,计算出河南省DMB-T单频网的场强分布,参照欧洲DVB-T标准,DMB-T系统所具有的特征,给出了DMB-T单频网覆盖率的参考标准。计算结果表明,基于16QAM调制解调器的河南省DMB-T单频网的信号能较好地覆盖平原地区。更多还原

【Abstract】 A mathematical model for the DMB- T single frequency network is set up in this paper, adopting the sub- regionalblocks algorithm, and taking into account the curvature of the Earth. The field strength distribution of He- Nan DMB- T single fre-quency network is calculated. Then consulting the European DVB- T standards, and taking into account the characteristics ofDMB- T system, the DMB- T single- frequency network coverage reference standards are provided. The results of calculation showthat the plain areas in He- Nan province can be covered satisfactorily by using the 16QAM modem.更多还原