Pseudorandom code is more and more attractive than ever before.It is widely used in the orbit measuring and tracing of guided missile, satellite and airship. The performance measurement of system such as radar, common communication, secrecy communication and communication system is also used in the system of digital signal processing(DSP).
The random characteristics of pseudo—random sequence has been investigated, the feedback logic function of m sequence has been deduced, the m Sequence occur(generator) has been designed, the waveform of pseudo—random sequence was tested.
Introduced the character, the mean and the mading way of the sequence. It was important that all states pseudo-random sequence’s madding by VHDL, module Chart, the good by using VHDL. Present the method, which constructs the feedback functions of nonlinear sequence. using the characteristic function,we construct a class of nonlinear feedback functions, and design the nonlinear maximal length feedback shift registers.
Keywords: m Sequence, Shift Registe, All states, Nonlinear Feedback Function, VHDL.