| Summary: | 碩士 === 國立高雄科技大學 === 電腦與通訊工程系 === 107 === Continuous Phase Modulation (CPM) can be applied to Multiuser CPM systems and satisfied the energy and bandwidth efficiency requirements of modern wireless communication systems. Recent research has developed a single user detector at the receiving end. The user detects the receiver and can find a single index, called the equivalent Euclidean distance, which is used to estimate the bit error rate of the overall system under the large signal ratio. However, when actually calculating such Euclidean distance, only the situation of two users can be considered conceptually. When there are too many users, the real Euclidean distance requires a large amount of calculation time to be obtained. Therefore, this paper applies simulation. The method actually simulates the bit error rate of the system and pushes back more to approximate the Euclidean distance in the user state.
On a multi-user CPM system, when the CPM is not an orthogonal signal or the initial phase of different users does not meet certain conditions, the Euclidean distance of the multi-user system is attenuated very quickly, sometimes even the distance attenuation is zero, which is currently The biggest drawback of this system. In this thesis, we use the Phase Shaping Pulses (PSP) for traditional CPM, called CPM-TU, and a new CPM modulation method. This CPM uses a limited phase shaping pulse. Time-limited PSP, called CPM-TL, simulates and compares the bit error rate respectively, and discusses the Euclidean distance between different modulation modulation coefficients and PSP under multi-user CPM under the same receiver complexity. Comparison.
In this paper, we consider PSP using 2REC-TL and a new PSP waveform. The study shows that 2REC-TL distance is exactly the same as CPFSK (continuous phase frequency shift keying), and the other can not only maintain orthogonality, but also Get 3dB of gain and low receiver complexity, ideal for multi-user CPM systems.
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