Applications of the PAM Representation of CPM
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چکیده
In this thesis, we are trying to optimize the tradeoff between the receiver complexity and its performance for two modulations currently used in aeronautical telemetry. A reduced complexity detector is of interest because it reduces the implementation cost. The Pulse Amplitude Modulation (PAM) representation of Continuous Phase Modulation (CPM) signals typically results in reducedcomplexity detectors with a performance that matches the performance of the optimal detector. In this work, we study simple trellis-based PAM detectors for two types of CPM used in aeronautical telemetry. The first is shaped-offset quadrature phase shift keying (SOQPSK), where we show that the state complexity can be cut in half relative to previous approaches—from 4 states down to 2—with asymptotically optimum performance. For comparison, we implement another reduced complexity technique known as Pulse Truncation (PT); both of these techniques make use of recent advances in SOQPSK technology based on a CPM interpretation of SOQPSK. The proposed simplifications are significant since trellis-based SOQPSK detectors are 1–2 dB superior with respect to the widely-deployed symbol-by-symbol detectors. These performance gains come at the expense of complexity, and the proposed 2-state detectors minimize this expense. The second version of CPM studied in this work is Pulse Code Modulation/Frequency Modulation (PCM/FM). We develop and compare the per-
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تاریخ انتشار 2008