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IMPLEMENTASI MODEL PEMBANGKIT RUNTUN PN

Abstract

In a spread spectrum communication system, PN sequence and Walsh code used as spreading code. PN sequence is generated based upon linear feedback shift registers.The stage of the registers determines the sequence length. The PN sequence used is modified maximal-length sequence. Walsh code is generated based upon Hadamard matrix.The matrix dimension determines the number of codes generated and the code length. This paper presents a design of system model for generating PN sequence and Walsh code. The design is implemented using Xilinx FPGA (XC4013-PG223-5). There are three kinds of design implemented, i.e.: 4-stage shift register PN generator and Walsh-8 generator; 8-stage shift register PN generator and Walsh-16 generator; and 15-stage registers PN generator and Walsh-64 generator.