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OQPSK schemes (Offset Quaternary Phase Shift Keying) are an excellent choice when an efficient, low-cost power amplification is intended, since they can have constant or quasi-constant envelope. When combined with SC-FDE (Single-Carrier with Frequency-Domain Equalization) they are good candidates for the uplink of broadband wireless systems, especially when low-complexity transmitters with power-efficient, grossly nonlinear power amplifiers are employed. To obtain constant envelopes, modulations like MSK (Minimum Shift Keying)) or other CPM (Continuous Phase Modulation) need to be employed, this produces a large transmission bandwidth, significantly larger than the minimum Nyquist bandwidth.
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