BER Performance of SS System Using a Huffman Sequence against CW Jamming

Takahiro MATSUMOTO  Hideyuki TORII  Yuta IDA  Shinya MATSUFUJI  

IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences   Vol.E101-A   No.1   pp.167-175
Publication Date: 2018/01/01
Online ISSN: 1745-1337
Type of Manuscript: Special Section PAPER (Special Section on Wideband Systems)
spread-spectrum (SS) system,  finite-length sequence,  Huffman sequence,  intersymbol interference (ISI),  continuous wave interference (CWI),  additive white Gaussian noise (AWGN),  

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In this paper, we theoretically analyse the influence of intersymbol interference (ISI) and continuous wave interference (CWI) on the bit error rate (BER) performance of the spread spectrum (SS) system using a real-valued Huffman sequence under the additive white Gaussian noise (AWGN) environment. The aperiodic correlation function of the Huffman sequence has zero sidelobes except the shift-end values at the left and right ends of shift. The system can give the unified communication and ranging system because the output of a matched filter (MF) is the ideal impulse by generating transmitted signal of the bit duration T=NTc, N=2n, n=1,2,… from the sequence of length M=2kN+1, k=0,1,…, where Tc is the chip duration and N is the spreading factor. As a result, the BER performance of the system is improved with decrease in the absolute value of the shift-end value, and is not influenced by ISI if the shift-end value is almost zero-value. In addition, the BER performance of the system of the bit duration T=NTc with CWI is improved with increase in the sequence length M=2kN+1, and the system can decrease the influence of CWI.