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Design of a Low Complexity Coherent Receiver for Partial Response Continuous Phase Modulation

Jaberi Nasab, Ali | 2025

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 58582 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Behroozi, Hamid
  7. Abstract:
  8. The design of optimal receivers has long been one of the fundamental challenges in communication systems, both from theoretical and practical perspectives. Despite their superior performance, optimal receivers often suffer from prohibitively high computational complexity, making their implementation difficult in real-world scenarios. Consequently, the development of reduced-complexity receivers that can closely approach optimal performance has attracted considerable attention. In this project, the objective is to design a receiver with low complexity while maintaining high efficiency in terms of bandwidth and power. Continuous Phase Modulation (CPM) is selected as the modulation scheme due to its superior spectral and power efficiency compared to conventional digital modulation techniques. However, CPM inherently exhibits nonlinear characteristics, which result in increased implementation complexity. To address this issue, Laurent’s linear approximation is employed to transform the nonlinear modulation model into an approximate linear representation, thereby simplifying the design of the receiver. Building on this framework, the proposed receiver incorporates three key components: (1) optimization of the modulation index to achieve near-optimal performance, (2) the design of an match filter to improve efficiency, and (3) the use of an equalizer to ensure reliable operation under multipath channel conditions. Additionally, a detection algorithm is developed to enable accurate data recovery. The results demonstrate that the proposed receiver achieves robust performance even under severe noise conditions, outperforming conventional receivers in ideal channel scenarios. In multipath channel, the integration of an appropriate equalizer further enhances its performance. Most importantly, the proposed design significantly reduces computational complexity while maintaining performance comparable to that of optimal but highly complex receivers. These characteristics highlight the practical advantages of the proposed approach, making it a promising solution for future communication systems
  9. Keywords:
  10. Low Complexity ; Equalizer ; Adaptive Filters ; Continuous Phase Modulation (CPM) ; Laurent’s Linear Approximation ; Optimum Receiver ; Channels

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