Continuous Phase Modulation Trellis Coded Modulation (tcm-cpm), Algorithm And Realization

With the development of wireless communication, more and more high-speed systems are needed to satisfy the massive data transmission in audio and video areas. Usually, we reach the goal in the cost of more bandwidth. Unluckily, bandwidth becomes another key problem in wireless communication because of the lack of available bandwidth resource. As a result, we should consider balancing the efficiency and the reliability, and design the high-speed communication systems in limited transmission bandwidth, which can get the high effective information rate in limited transmission bandwidth.Trellis-Coded Modulation (TCM) with redundant signal sets pioneered by GUngerboeck has been largely used for the digital transmission over band-limited channels. It evolved over the past decade as a combined coding and modulation technique for digital transmission over band-limited channel and its main attraction comes from the fact that it improves the reliability of digital communication channels without compromising bandwidth efficiency.In the chapter 3, for most applications requiring transmission of digital data over nonlinear and/or fading channela, continuous phase modulation (CPM) is desirable more and more as its constant-envelope. In order to obtain a further improvement in energy efficiency, we proposed the coded CPM scheme and its combination with TCM, which can be a solution for the long distance wireless communication technology with high spectrum efficiency, high power efficiency, and low receiving threshold.In the chapter 4, we based on the coherent/noncoherent demodulation system, simulated in detail the key technologies used in the arithmetic. In addition, the combination of TCM and CPM cannot utilize unattached difference coding simply to solve the problem that phase offset caused. As a result, in this paper we designed a rotational-invariance system of TCM-CPM to solve the problem. Under AWGN condition, the floating performance of TCM-8CPM and TCM-4CPM were illustrated.The rest parts of the essay focused on the design and realization of a four-mode system of TCM-CPM in which, 32-state conventional TCM-8CPM, 32-state conventional TCM-4CPM, 16-state rotational-invarinace TCM-8CPM, and 16-state rotational-invarinace TCM-4CPM encoders were considered. It first gave a practical structure of TCM-8CPM encoder and Soft-Viterbi decoder and its realization with FPGA, the logic structure of encoder and decoder were discussed. In addition, LUT and pipeline technique were applied in it. Then, we also described the solution scheme for four-mode system of TCM-CPM. AH the timing design and the function-simulating results were given in the end.