The effects of Ricean fading channel on fast frequency hopping spread spectrum communication systems

Frequency hopping spread spectrum (FHSS) communication systems offer significant performance advantages in view of their low probability of intercept, improved performance in multipath fading environments and their ability to avoid interference by hopping into low interference frequency channels. For the transmitted sequence to be correctly received and demodulated, the frequency hop sequence used at the receiver should be similar to that employed in the transmitter. Code acquisition in frequency hopping attempts to address this problem by providing a frequency hop pattern at the receiver that is nearly identical to that used at the transmitter. Code acquisition brings the alignment between the transmitter and the receiver hop pattern to at least one hop period. In this paper, the serial search code acquisition, which is the first step of synchronization, is studied for frequency hopping spread spectrum (HFSS) system over Rayleigh fading channel. Simulation results show the effect of fading channel on the code acquisition.

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High loop-filter-order ΣΔ-fractional-n frequency synthesizers for use in frequency-hopping-spread-spectrum communication-systems

Proceedings of the 2003 International Symposium on Circuits and Systems, 2003. ISCAS '03. ◽

10.1109/iscas.2003.1205940 ◽

2003 ◽

Cited By ~ 2

Author(s):

N. Christoffers ◽

R. Kokozinski ◽

S. Kolnsberg ◽

B.J. Hosticka

Keyword(s):

Spread Spectrum ◽

Communication Systems ◽

Frequency Hopping ◽

Frequency Synthesizers ◽

Spread Spectrum Communication ◽

Loop Filter ◽

Filter Order ◽

Frequency Hopping Spread Spectrum ◽

High Loop

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Analisis Karakterisasi Teknologi Direct Sequence Spread Spectrum Dan Frequency Hopping Spread Spectrum

Al-Fiziya: Journal of Materials Science, Geophysics, Instrumentation and Theoretical Physics ◽

10.15408/fiziya.v2i2.9513 ◽

2019 ◽

Vol 2 (2) ◽

pp. 129-138

Author(s):

Fawzan Galib Abdul Karim Bawahab ◽

Elvan Yuniarti ◽

Edi Kurniawan

Keyword(s):

Spread Spectrum ◽

Communication Systems ◽

Multiple Access ◽

Frequency Hopping ◽

Direct Sequence Spread Spectrum ◽

Direct Sequence ◽

Frequency Hopping Spread Spectrum ◽

Two Systems ◽

The Difference

Abstrak. Pada penelitian ini, telah dilakukan analisa karakterisasi pada teknologi Direct Sequence Spread Spectrum dan Frequency Hopping Spread Spectrum, sebagai salah satu teknik multiple-access pada sistem komunikasi. Karakterisasi dilakukan untuk mencari bagaimana cara meningkatkan keoptimalan kedua sistem tersebut, dalam mengatasi masalah interferensi dengan sistem dan channel yang sama. Dan juga untuk menentukan veriabel apa yang mempengaruhi keoptimalan kedua sistem tersebut. Karakterisasi dilakukan dengan menentukan variabel-variabel yang mempengaruhi keoptimalan keduanya. Hasil dari karakterisasi, diketahui variabel-variabel yang mempengaruhi kemampuan sistem DSSS yaitu nilai frekuensi spreading (). Sedangkan untuk sistem FHSS yaitu nilai frekuensi spreading ( dan ) dan selisih antara frekuensi hopping data dengan frekuensi hopping interferensi . Kata Kunci: BER, DSSS, FHSS, Interference, Spread spectrum. Abstract. In this study, characterization of Direct Sequence Spread Spectrum and Frequency Hopping Spread Spectrum technologies have been done, as one of the multiple-access techniques in communication systems. Characterization is done to find out how to improve the ability of the two systems, in solving interference problems with the same system and channel. And also to determine what veriabel affects the ability of the two systems. Characterization is done by determining the variables that affect the ability of both. The results of the characterization, known variables that affect the ability of the DSSS system are the spreading frequency value (). As for the FHSS system, the spreading frequency value ( and ) and the difference between frequency hopping data with frequency hopping interference .

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