A Design of Basis Function for Transform Domain Communication System

Abstract:

To improve the systems anti-jamming capability by making full use of distributing information of background signals spectrum for basis function (BF) of transform domain communication system (TDCS), a method of basis function design using M-ary sequence to express spectrum amplitude is proposed. The short-time spectrum characteristic of modulated and demodulated signal of single-chip waveform coded basis function is analysed with jamming coexistence. Then the analytic expression of system bit error rate (BER) is derived and the optimization problem of solving the BER analytic expression is converted into the problem of solving maximum signal-to-interference-plus noise ratio (SINR). The problem is solved by utilizing the uniform distribution characteristic of random phase. Then the M-ary basis function is obtained. The simulation result shows that the designed system has better anti-jamming capability than conventional binary basis function system, especially in the condition of high interference-to-signal ratio.

• Periodical: Applied Mechanics and Materials (Volumes 347-350)
• Pages: 2143-2147
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.347-350.2143
• Online since: August 2013
• Authors: Nai Qi Wei, Zi Li Chen
• Keywords: Basis Function, Cognitive Radio (CR), Short-Time Spectrum, Spectrum Amplitude, Transform Domain Communication System

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