For CDMA in the Q-channel the used polynomial is in a Galois configuration as following: From a primitive polynomial, the equivalent circuit can be modeled with electronic components such as flip flops and XOR gates each monomial indicates the feedback paths. In addition to this objective, a reliable method is given, allowing verification of the obtained signals.įinite fields provide the necessary theory in designing LFSR. Our goal in this work is not only to make a circuit board using standard integrated electronics components, but also to be able to move quickly on FPGA boards. However, their design is often done using only FPGA. LFSR is also helpful for generating quasi-random sequences and is used in hardware Built-In Self-Test (BIST), and security for Radio Frequency Identification (RFID) technologies. The mask allows assignment of codes to identify users and base stations. Lastly the results have been analyzed and discussed.įor CDMA, LFSRs are mainly used for the multiple access scheme. Thus tests and checks have been performed on the circuit. In this work, we first present the model that is used to design LFSR.įrom this basic model we go further into the design using integrated electronic components. LFSRs are used for DS-CDMA, errors detection and correction, and applications using pseudo-random sequences. LFSR, CDMA, DS-CDMA, PCB, FPGA, Integrated Circuit (IC), Spread Spectrum (SS), Modular Shift Register (MSRG) This latter facilitates the generation of pseudo-random codes based on LFSR and their integration into electronic systems.
In addition, a temporal and spectral analysis of the circuit is performed in order to validate the design. An accessible model facilitating the synthesis on Printed Circuit Boards (PCB) and implementation on Field Programmable Gate Array (FPGA) is offered. Integrated electronic components have been used. In this paper, a design of LFSR with offset mask has been presented, for Direct Sequence Code Division Multiple Access (DS-CDMA) applications. Hardware implementation of Linear Feedback Shift Register (LFSR) plays a great and very important role in communication systems, and in many security devices. Received 8 March 2016 accepted 24 April 2016 published 28 April 2016 This work is licensed under the Creative Commons Attribution International License (CC BY).
1Engineering Institute of Computer Science and Telecommunications (I3T), Dakar, SenegalĢDepartment of Physics, Faculty of Sciences and Techniques, Cheikh Anta Diop University, Dakar, SenegalĬopyright © 2016 by authors and Scientific Research Publishing Inc.
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