To increase the bandwidth efficiency , such a system scheme use the msk modulation method combining with a premodulation filter
2.
Considering the bandwidth efficiency , the error rate performance and the complexity for realization together , we construct a digital transmission system with single - carrier modulation technique using the optimum premodulation filter . then the system parameters and performance indexes are prensent
3.
A virtual cathode oscillator with an axially extracted te10 or te11 mode has been investigated using the pic code . it can emit microwaves axially through an antenna without mode converter or transition waveguide , making the system more simple and compact . the efficiency of this device can be enhanced by employing premodulation cavity , resonant cavity , feedback mechanism , and virtual cathode formed by two electron beams
4.
As we have introduced a multilevel decision method with discriminator detection to improve the error rate performance , the deducing and analyzing for this method are present in this article . the theoretical error rate and the monte carlo simulation result are showed in figure to compare the system error rate performance affected by different premodulation filter
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