Results 21 to 30 of about 386 (162)

Performance analysis of DSSS- and CSS-based physical layer for IoT transmission over LEO satellites

ETRI Journal, 2022
To determine a suitable waveform for Internet of Things (IoT) transmission over low-Earth orbit (LEO) satellites, this paper reports the results of a performance comparison between chirp spread spectrum (CSS)-based LoRa and direct sequence spread ...
Sooyeob Jung, Gyeongrae Im, Dong-Hyun Jung, Pansoo Kim, Joon Gyu Ryu, Joonhyuk Kang   +5 more
doaj   +1 more source

Code Synchronization Algorithm Based on Segment Correlation in Spread Spectrum Communication

Algorithms, 2015
Spread Spectrum (SPSP) Communication is the theoretical basis of Direct Sequence Spread Spectrum (DSSS) transceiver technology. Spreading code, modulation, demodulation, carrier synchronization and code synchronization in SPSP communications are the core
Aohan Li, Ziheng Yang, Renji Qi, Feng Zhou, Guangjie Han   +4 more
doaj   +1 more source

Performance evaluation and mathematical analysis of direct sequence and frequency hopping spread spectrum systems under wideband interference

IJAIN (International Journal of Advances in Intelligent Informatics), 2018
This paper presents performance evaluation and comparison analysis of Direct Sequence Spread Spectrum (DSSS) and Frequency Hopping Spread Spectrum (FHSS) systems.
Fawzan Ghalib Abdul Karim Bawahab, Edi Kurniawan, Elvan Yuniarti, Bambang Widiyatmoko, Dwi Bayuwati   +4 more
doaj   +1 more source

Performance analysis of direct-sequence spread-spectrum underwater acoustic communications based on at-sea data [PDF]

MATEC Web of Conferences, 2019
Direct sequence spread spectrum (DSSS) signal uses phase coherent signals where the information symbols are multiplied with a code sequence, commonly known as chips. The signals are processed at the receiver using the code sequence as a matched filter to
Du Pengyu, Wang Lujun, Zhang Hongtao, Xie Zhe   +3 more
doaj   +1 more source

Adaptive anti-jamming technologies based on direct sequence spread spectrum and single carrier frequency domain equalization

Tongxin xuebao, 2022
To solve the performance limitation of direct sequence spread spectrum system in complex multipath environment, an adaptive anti-jamming spread spectrum framework that organically combines single carrier frequency domain equalization (SCFDE) and direct ...
Fanglin GU, Yuzhen HUANG, Ying ZHAO, Haitao ZHAO, Jibo WEI   +4 more
doaj   +2 more sources

Spread Spectrum Modem for Voice and Data Transmission

Journal of Advances in Information Technology, 2012
This paper describes the design of a direct sequence spread spectrum (DSSS) modem for voice and data transmission using SYSTEMVIEW and MATLAB. The advantage of DSSS voice and data transmission includes the immunity from interference signals and anti ...
Md. Abdul Alim
doaj   +1 more source

Analisis Unjuk Kerja Convolutional Code pada Sistem MIMO MC-DSSS Melalui Kanal Rayleigh Fading

Majalah Ilmiah Teknologi Elektro, 2017
Kombinasi antara sistem MIMO (multiple input multiple output), OFDM (orthogonal frequency division multiplexing), dan spread spectrum serta adanya teknik pengkodean kanal mampu mengurangi efek fading dan error yang terjadi. Penelitian ini bertujuan untuk
Kadek Agus Mahabojana Dwi Prayoga, Ni Made Ary Esta Dewi Wirastuti, I Gst A. Komang Diafari Djuni Hartawan   +2 more
doaj   +1 more source

DETECTION OF THE DSSS SIGNAL WITH VARIABLE PN CODES USING THE ANN

Iraqi Journal of Information & Communication Technology, 2021
- Direct sequence spread spectrum systems appeared and are used to protect the transmitted data DSSS Systems might be one of the solutions for reliable and secured communications.
Aya Y. Khudhair , Rajaa aldeen A. Khalid   +1 more
doaj   +1 more source

Code index modulation method with multidimensional invisible data mapping

IET Signal Processing, 2022
With the continuous improvement of the application requirements of Direct Sequence Spread Spectrum (DSSS), especially the high requirements of data transmission rate, the advantages of traditional DSSS system are limited, so the index modulation DSSS ...
Fang Liu, Yuanfang Zheng, Hongyang Lu, Yongxin Feng   +3 more
doaj   +1 more source

Blind despreading and deconvolution of asynchronous multiuser direct sequence spread spectrum signals under multipath channels

IET Signal Processing, 2023
In non‐cooperative scenarios, the spreading sequences or waveforms of the direct sequence spread spectrum (DSSS) signals is unknown to the receiver.
Liangliang Li, Huaguo Zhang, Songmao Du, Tao Liang, Lin Gao   +4 more
doaj   +1 more source