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How to understand spectrum of OQPSK and QPSK?

12-18
In RFMicroelectronics writen by Razavi, he mentioned the spectrum of OQPSK and QPSK is same. But from my understanding, OQPSK has smoother phase change and should have less high frequency than QPSK. Is my understanding wrong? Thanks,

时域峰均比低,边带性能应该会更好吧

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