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Baseband Multipath Fading Simulator
Author(s) -
Walker W. F.
Publication year - 1966
Publication title -
radio science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.371
H-Index - 84
eISSN - 1944-799X
pISSN - 0048-6604
DOI - 10.1002/rds196617763
Subject(s) - fading , delay spread , multipath propagation , computer science , rayleigh fading , fading distribution , multipath interference , baseband , electronic engineering , diversity scheme , bandwidth (computing) , acoustics , telecommunications , channel (broadcasting) , engineering , physics
A device is described which was built to provide representative fading multipath channel behavior for the investigation of communication system performance. The unit is based on the tapped delay line approach and operates in the band of 50 to 8000 c/s. The tap modulation functions are camgenerated with adjustable correlation. Fading bandwidths of 0 to 5 c/s are available, and 30 hr of operation are possible at a fading bandwidth of 1 c/s with no repetition of the pattern. Dual diversity output and additive noise and interference facilities are provided. In the HF mode, test results are presented showing Rayleigh amplitude fading and flat phase statistics for any input frequency between 300 and 3300 c/s. The unit is also used for underwater path simulation by substituting a tape recorder with multiple pickups as the delay device. In this mode, delay spreads of up to 10 sec may be obtained. Finally, elementary sonar path simulation is achieved by using the tape delay system for outgoing and return‐path simulation coupled with a tapped delay line for target highlight synthesis.