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满足换位子条件环的交换性(英文) 被引量:1
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作者 mohd ashraf 《吉林大学自然科学学报》 CSCD 1991年第1期26-28,共3页
本文证明:有1环R是交换的充要条件是有正整数m,q,使对每个y∈R有正整数n(y)对一切x∈R有或。
关键词 交换性 换位子
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Performance Analysis of ASK and PSK Modulation Based FSO System Using Coupler-Based Delay Line Filter under Various Weather Conditions
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作者 mohd ashraf Gaurav Baranwal +2 位作者 Dinesh Prasad Saima Idris Mirza Tariq Beg 《Optics and Photonics Journal》 2018年第8期277-287,共11页
Free space optical communication (FSO) proves to be very effective and efficient technology for wireless communication. This work basically deals with the designing of FSO systems. Further, a comparative study has bee... Free space optical communication (FSO) proves to be very effective and efficient technology for wireless communication. This work basically deals with the designing of FSO systems. Further, a comparative study has been made to ascertain which modulation technique proves better for communication. This paper investigates the performance of ASK and PSK modulation based FSO system by varying different FSO parameters under several conditions including haze, rain, mist and fog. Finally, simulation results are analysed and discussed. 展开更多
关键词 FSO Bit Error Rate (BER) Amplitude SHIFT Keying (ASK) Phase SHIFT Keying (PSK) Attenuation
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