Which wireless receiver has the better sensitivity for the same everything except the change in the Base-band de-modulation, one base-band demodulator for OQPSK and other base-band demodulator for MSK, which one gives better sensitivity ?
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$\begingroup$ that's undefined. You need to tell us what kind of demodulator you have; OQPSK and MSK are just two classes of modulation schemes (which overlap, too). There's different demodulators that you could have. And then you need to define what kind of noise you have. $\endgroup$– Marcus MüllerCommented Aug 29, 2022 at 18:29
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$\begingroup$ @MarcusMüller All the system is exactly the same, IF part of digital demodulator is the same too which is the complex filter + digital mixer, and the only difference is in the baseband demodulator, so conceptually which scheme of them could get better sensitivity at the receiver input $\endgroup$– digitalmanCommented Aug 30, 2022 at 13:28
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1$\begingroup$ again, saying "OQPSK" doesn't define the baseband demodulator. Neither does saying "MSK". A scheme doesn't have sensitivity per se. A demodulator, applied to a scheme under a noise model does. $\endgroup$– Marcus MüllerCommented Aug 30, 2022 at 13:29
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MSK is a band efficient modulation type with 1 bit/sec/Hz. On the other hand, OQPSK is of 2 bit/sec/Hz. MSK is equivalent to BPSK as well as OQPSK is equivalent to QPSK in terms of bit error rate. Therefore, when an uncoded scenario is considered, MSK is of a 3 dB of coding gaing compared to QPSK. In addition, the constant envelope of MSK is a huge benefit for non-linear amplifiers, yet the throughput is decreased by half.
