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适合农村发展的MMDS有线电视系统
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作者 孙祯祥 《影视技术》 1996年第4期18-19,共2页
进入九十年代以来,有线电视以其传播节目多、图像清晰度高等优点在我国大中小城市迅速发展起来。相对比较,县城以下的乡镇和广大农村收看电视节目比较困难。随着改革开放的深入发展,农民也希望能在精神文化生活方面得到改善,盼望看上好... 进入九十年代以来,有线电视以其传播节目多、图像清晰度高等优点在我国大中小城市迅速发展起来。相对比较,县城以下的乡镇和广大农村收看电视节目比较困难。随着改革开放的深入发展,农民也希望能在精神文化生活方面得到改善,盼望看上好的有线电视节目。 展开更多
关键词 有线电视 多路调幅 微波分配系统 MMDS
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Effect of phase noise in an OFDM/OQAM system
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作者 陈琦帆 吴炳洋 程时昕 《Journal of Southeast University(English Edition)》 EI CAS 2003年第2期108-113,共6页
The performance of an OFDM/OQAM system under phase noise is analyzed. The analysis helps to direct the design of low cost tuners through specifying the required phase noise characteristics. Discrete time formulation o... The performance of an OFDM/OQAM system under phase noise is analyzed. The analysis helps to direct the design of low cost tuners through specifying the required phase noise characteristics. Discrete time formulation of OFDM/OQAM is first derived with the square root raised cosine (SRRC) filter as the pulse-shaping filter. Then the effect of multiplicative phase noise is equivalently represented as additive white Gaussian noise (AWGN), the variance of which is given analytically. We can observe that the same result as OFDM/QAM system is derived. Lastly, all the analytical results are verified by the bit error rate (BER) degradation through Monte Carlo simulation. 展开更多
关键词 OFDM/OQAM OFDM/QAM phase noise BER performance
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