scholarly journals A Multiple-Access Time and Frequency Spectrum-Spreading Modulation

2018 ◽  
Vol 2018 ◽  
pp. 1-10
Author(s):  
Samer S. Saab ◽  
Joe Khalife ◽  
Rayana H. Jaafar
Keyword(s):  
Spread Spectrum ◽  
Multiple Access ◽  
Direct Sequence Spread Spectrum ◽  
Access Time ◽  
Modulation Scheme ◽  
Phase Shift Keying ◽  
Shift Keying ◽  
Single User ◽  
Adjacent Channels ◽  
Binary Phase Shift Keying

In this paper a novel modulation scheme called Carrier Interleaved Multiple Access (CIMA) is proposed. CIMA provides an alternative for multiple-access modulation accommodating resistance to noise and channel interference. The approach is based on polar signaling modulated with an FM-like composite sinusoidal function. The user assigned frequency deviation and modulation index are strictly related and unique. The latter parameters are generated using a nontraditional pseudorandom noise generator (PRNG). This PRNG provides CIMA with low interference capability between cochannels and adjacent channels. CIMA can be considered for a single-user or multiple-access technique. Selected CIMA characteristics are presented. In order to numerically illustrate the effectiveness of the proposed modulation scheme, the performance of CIMA is compared with the conventional direct-sequence spread spectrum binary phase-shift keying (DSSS-BPSK) modulation.

scholarly journals Simulasi Direct Sequence Spread Spectrum (DSSS) Pada Modulasi Binary Phase Shift Keying (BPSK)

Spektral ◽  
2021 ◽  
Vol 2 (1) ◽  
Author(s):  
Nabila Khansa Hartono ◽  
Faradila Alvina Putri ◽  
Fitri Elvira Ananda
Keyword(s):  
Phase Shift ◽  
Spread Spectrum ◽  
Theoretical Concept ◽  
Direct Sequence Spread Spectrum ◽  
Direct Sequence ◽  
Phase Shift Keying ◽  
Binary Phase ◽  
Shift Keying ◽  
Binary Phase Shift Keying ◽  
Bpsk Modulation

Spread spectrum is a data transmission technique that spreads out information spectrum energy signals in a frequency band that is much larger than the minimal spectrum. One of the spread spectrum techniques is Direct Sequence Spread Spectrum (DSSS). This research was built the simulation of DSSS on Binary Phase Shift Keying (BPSK) modulation using MATLAB software. The simulation results of this DSSS simulation are displaying information wave signals, PN codes, signals that have been added with PN codes, signals modulated with BPSK, modulation signals that have been added with AWGN noise, demodulation signals, DSSS output signals and BER vs SNR graphics on the channel AWGN. The simulator of DSSS on BPKS in this research have been running according to the DSSS signal order flow and theoretical concept.   Keywords: AWGN, BPSK , DSSS, PN Code, PN Sequence

scholarly journals Reception of differential binary phase shift keying signals with weight processing of sub-symbols in information transmission systems with frequency hopping spread spectrum.

2020 ◽  
Vol 2020 (10) ◽  
Author(s):  
A.A. Paramonov ◽  
◽  
Van Zung Hoang ◽  
Keyword(s):  
Phase Shift ◽  
Spread Spectrum ◽  
Noise Immunity ◽  
Frequency Hopping ◽  
Phase Shift Keying ◽  
Radio Communication ◽  
Frequency Hopping Spread Spectrum ◽  
Shift Keying ◽  
Radio Communication System ◽  
Binary Phase Shift Keying

Signals with frequency hopping spread spectrum (FHSS) have long been widely used in military radio communication systems (RCS) due to their frequency-energy characteristics. In such systems, the most important characteristic is noise immunity, i.e. the ability to ensure reliable transmission and reception of information under the influence of various types of organized intentional and unintentional interference. In this paper, we consider the case when the input of the receiver, in addition to the receiver's own noise, contains deliberate interference, which is considered noise interference. In this case, it is assumed that the interference covers only part of the operating frequencies of the radio communication system. The algorithm of optimal noncoherent signal reception with weight processing for making a decision about the transmitted symbol (bit) is in the focus of the paper. Static radio engineering methods, as well as Monte Carlo simulation, have been used to evaluate the noise immunity of receiving differential binary phase shift keying signals with FHSS when exposed to deliberate Partial-Band Interference. It is shown that the noise immunity of a radio communication system under conditions of destructive influence can be improved by using the intra-symbols FHSS mode with the proposed reception algorithm. With an increase in the signal-to-interference ratio, the noise immunity of information transmission increases significantly. The optimal strategy for dealing with Partial-Band Interference when the RCS is operating in the intra-symbols FHSS mode is to select the optimal multiplicity of symbol frequency diversity, which minimizes the probability of a bit error probability. The obtained dependencies are presented in order to compare and determine the effectiveness of the considered transmission mode with the proposed reception algorithm.

scholarly journals Performance Enhancement of DS-CDMA System using Extended BPSK Modulation Scheme

2016 ◽  
Vol 4 (2) ◽  
pp. 172-180
Author(s):  
Barkha Pandey ◽  
Raghu Harsh Kalia ◽  
Monica Kaushik ◽  
Monika Arora
Keyword(s):  
Phase Shift ◽  
Wireless Communication ◽  
Spectrum Efficiency ◽  
Modulation Scheme ◽  
Cdma System ◽  
Phase Shift Keying ◽  
Binary Phase ◽  
Modulation Format ◽  
Shift Keying ◽  
Binary Phase Shift Keying

In a last few decades there has been tremendous growth and a drastic rise in wireless communication technologies. The major issue that the world is facing today with the advent of so many sophisticated wireless communication devices is efficient utilization of the spectrum. Spectrum efficiency comes together with a tradeoff factor of energy consumption. Thus, the need of the hour is an energy and bandwidth efficient technique. DS-CDMA is one of the competitive and most investigated technique in wireless communication which caters the large demand at the same time with limited bandwidth. Existing modulation techniques does not promise to provide better performance in case of higher noise. Therefore, one looks for a better BER stipulated modulation format to improve and enhance the performance of the system. This article revisits conventional Binary phase shift keying method and compares its performance in terms of BER with a special Extended Binary Phase Shift Keying (EBPSK) modulation format for a DS- CDMA system. EBPSK scheme is flexible and simple which is easily integrated in a network and assures improved and enhanced performance.

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