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In conventional M-ary differential chaos shift keying modulation (DCSK) systems, the distance between constellation points gets closer as M increases, resulting in poor performance. A hybrid modulation scheme based on pulse position modulation (PPM) and DCSK is proposed in this letter to improve bit-errorrate (BER) performance. In this scheme, one part of the bits is modulated by PPM while the oth...

Hybrid Modulation Scheme Combining PPM With Differential Chaos Shift Keying Modulation