Non-coherent phase compensated sphere detector for partial response CPM

• Main Authors: Liu, Xiaobei, Guan, Yong Liang
• Other Authors: School of Electrical and Electronic Engineering
• Format: Article
• Language: English
• Published: 2025
• Subjects: Engineering; Detector; Continuous phase modulation; Differential detection; Viterbi algorithm
• Online Access: https://hdl.handle.net/10356/182826
• Institution: Nanyang Technological University

Continuous phase modulation (CPM) has been widely used in wireless communications, as its continuous phase and constant envelop lead to high bandwidth and power efficiency. Non-coherent detection of CPM is promising in real applications, as carrier phase recovery is not necessary. However, there is a performance gap between the non-coherent and coherent detections, especially for partial response CPM. In this letter, a non-coherent phase-compensated sphere detector (PC-SD) is proposed. Under a same observation length, the proposed non-coherent PC-SD significantly outperforms the conventional non-coherent maximum-likelihood detector for partial response CPM, with a much lower computational complexity. Furthermore, the proposed non-coherent PC-SD also outperforms the state-of-the-art delay-optimized differential detector, and reduces the gap between non-coherent and coherent detectors to only 1 dB. Finally, the proposed non-coherent PC-SD is very robust against Doppler shift.