Transform Domain Communication System Design, Modeling And Simulation Studies

In this paper, a new communication system-Transform Domain Communication System (TDCS) is researched. TDCS is a developmental system that has demonstrated interference avoidance capability. It is different from traditional communication systems at two points: 1) the communication waveform is designed in transform domain (frequency or scale) according to the estimation of electromagnetic environment, 2) no carrier modulation is employed, but a noise-like basis function is used to modulate the data. The work of the thesis is as follows. First, the basic theory of TDCS is introduced and the principal algorithms about TDCS are analyzed. A simulation platform including dynamic and static is designed in order to research the characteristics of TDCS. Two kinds of TDCS respectively based on FFT and DWT are studied using the platforms. A TDCS-CDMA simulation platform are also completed for researching the ability of multiple access and a formula about bit error rate (BER) of multiple access is proved. The performances of TDCS in the case of transmitter and receiver with different basis function are also analyzed and a formula as a result is presented. Additionally the performances of TDCS about multipath are simply discussed. The modulation technique is also investigated in this paper. Finally a large amounts of simulation experiments support above All research works . This paper is the exploring research of TDCS. The results having obtained in this paper provid a strong groundwork for the future research work of TDCS.