Very low signal to noise ratios coherent communications with an M-ary orthogonal spread spectrum signaling scheme

2017 ◽  
Vol 141 (5) ◽  
pp. 3987-3987
Author(s):  
Jacob L. Silva ◽  
Paul J. Gendron
Keyword(s):  
Spread Spectrum ◽  
Signal To Noise ◽  
Coherent Communications ◽  
Orthogonal Spread

Anti-Stealth Radar with Spread Spectrum Technology

2011 ◽  
Vol 474-476 ◽  
pp. 2079-2084 ◽  
Author(s):  
Lian Qing Fu ◽  
Li Sheng Yang ◽  
He Tang ◽  
Ya Ning Ma
Keyword(s):  
Spread Spectrum ◽  
Signal To Noise ◽  
Intercept Probability ◽  
Simulation Results ◽  
Stealth Radar

The paper addresses the realization of anti-stealth radar and the problems which modern radars are confronted with. With the application of spread spectrum technology to radars, the capability of anti-stealth and anti-jamming is improved. Signal-to-noise (SNR) of the receiver increases through raising the launching power. Intercept probability decreases by transmitting multiple PN codes. Range of radar detector increases on condition that the intercept probability is unchanged. Simulation results show the validity of the proposed method.

An Effective Scheme of M-Ary Spread Spectrum System Based on Orthogonal Spread Spectrum and CPSK

2013 ◽  
Vol 765-767 ◽  
pp. 2696-2700
Author(s):  
Yue Xuan Liu ◽  
Shu Jian Liang ◽  
Yue Huai Ma ◽  
Song Xian Gong
Keyword(s):  
Monte Carlo Simulation ◽  
Bit Error Rate ◽  
Spread Spectrum ◽  
Bandwidth Efficiency ◽  
Transform Domain ◽  
Communication Scheme ◽  
System Synchronization ◽  
Orthogonal Spread ◽  
Simulation Results ◽  
Ber Performance

A hybrid M-ary spread spectrum (SS) communication scheme which combined with orthogonal SS and CPSK technique is proposed. Based on dual orthogonal SS, every SS code is treated as original code to adopt CPSK modulation, the unattached synchronous code is chosen to achieve system synchronization. At the receiver, A circular correlator based on transform domain processing is employed to de-spread the received signals. Compared with M-ary SS and CPSK, the proposed scheme is able to obtain higher bandwidth efficiency, stronger anti-intercept capability, and better synchronous performance. The Monte-Carlo simulation results demonstrate that the proposed scheme can achieve better synchronous and bit error rate (BER) performance under additional white gauss noise channel models.

scholarly journals Rancang Bangun FM Transmitter Menggunakan Metode Spread Spectrum Signal Berbasis Raspberry Pi

2021 ◽  
Vol 11 (3) ◽  
pp. 141-144
Author(s):  
Achmad Hanif ◽  
Aad Hariyadi ◽  
Aisah Aisah
Keyword(s):  
Spread Spectrum ◽  
Signal To Noise Ratio ◽  
Raspberry Pi ◽  
Signal To Noise ◽  
Noise Ratio

Kebutuhan akan sistem Komunikasi yang dapat mengatasi masalah interferensi, dapat menjamin kerahasiaan informasi yang dikirim dan dapat beroperasi pada tingkat S/N  (Signal to Noise Ratio)  yang rendah atau tahan terhadap pada derau yang besar.Salah tekonologi dalam sistem komunikasi adalah sistem spread spectrum. Karakteristik penting dari komunikasi spread-spectrum adalah bahwa dapat memberikan perlindungan terhadap sinyal yang mengganggu dengan daya yang terbatas. SBC  (Raspberry pi) dapat diimplementasikan menjadi sebuah pemancar FM dengan menggunakan socket SOC Broadcom bcm 2837 yang akan menghasilkan sebuah base clock,  kemudian sinyal output akan dihasilkan melalui pin GPIO 7.

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