occupied bandwidth

Occupied bandwidth ( OB) and necessary bandwidth ( NB) are discussed, and it is emphasized that the research on "breaking through Nyquist rate" must be done in the sense of NB.

提出占用带宽和必要带宽的概念，指出突破Nyquist速率的研究必须基于必要带宽才有意义。

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Simulation results show that: under the condition that the occupied bandwidth and the information rate are equal, the anti-noise performance of the communication system based on chaos M-ary modulation and demodulation method can achieve the theoretical limit of the ideal incoherent OOK receiver.

结果显示：在带宽和码元速率相同的情况下，混沌振子多进制调制解调通信系统的误码率性能能够达到传统非相干OOK接收机的理论极限。

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