The Anti-jamming And Efficient Application Of Ci - Oriented Study Of Ofdm

This thesis selects carrier interferometry orthogonal frequency divisionmultiplexing (CI-OFDM), which has lower bit error rate (BER)and better performanceof Peak-to-Average Power Ratio(PAPR), as the starting point of the design. We designthe wireless transmission system in the practical application scenarios.First, this thesis will introduce the model of CI-OFDM transceiver, describe theimplementation of the CI code. Then, in order to verify the CI-OFDM, this thesis willstudy the performance of it through simulations, which are in scenario of spectrumsharing, under impefect channel estimation and with integration of ZP-OFDM receivertechnology. Ready for the applications of anti-jamming and energy efficiency in theCI-OFDM.Secondly, this thesis divides anti-jamming into two parts: jamming detection andjamming rejection. It will target anti-jamming design by the frequency diversity gain ofCI-OFDM. Two jamming detection algorithms based on generalized likelihood ratiotesting (GLRT) are proposed, when CI-OFDM signal exists. They are: multi-antennaalgorithm based on collaboration in the spatial domain, oversampling algorithm basedon the collaboration in the time domain. The performance of the two algorithms isexamined through simulations. In jamming suppression step, according to the spreadrole of the CI code, we propose a receiving scheme called ZS-CI-OFDM which set thedata on the subcarriers experienced jamming to zero. Analysis of the mathematicalmodel and comparison CI-OFDM and ZS-CI-OFDM are given. Based on the of therespective Signal Jamming Noise Ratio (SJNR) results, we design an adaptive receiver,which adjusts the detection scheme according to the jamming power and bandwidth, tomatch the corresponding jamming scenarios.Finally, against the energy saving and environmental trends in wirelesstransmission, this thesis concentrates on the way to improve the effectiveness oftransmitting power. According to the minimized transmit power needed in adaptivetransmission, and the low PAPR characteristic of CI-OFDM, we propose a noveladaptive CI-OFDM transceiver，Hybrid-CI-OFDM, which could meet the quality of service（QoS）. We then propose two schemes for hybrid threshold setting. As a result,the target of energy efficiency has been achieved under QoS constraints。...