A ZCZ‐CDMA system with BFSK modulation

Huang, Jiajia; Matsufuji, Shinya; Matsumoto, Takahiro; Kuroyanagi, Noriyoshi

doi:10.1002/dac.2313

Cited by 8 publications

(4 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In this section, the practicable ZCZ codes for each modulation scheme are described together [5]. Let A be a set of bi-phase sequences with length N and the family size M, defined by ZCZ sets are families of sequences, whose periodic auto/cross-correlation functions have zero correlation zones at both sides of the zero-shift and a ZCZ set can be defined by…”

Section: Zcz Codesmentioning

confidence: 99%

A Plural CDMA System with Zero Correlation Zone Codes in Emergency Communication

Huang¹,

Zhang²,

Cao³

et al. 2018

dtcse

View full text Add to dashboard Cite

Abstract. This paper proposes a plural ZCZ-CDMA system with binary frequency keying modulation. It is shown that this system achieves more advantageous bit error rate characteristics over Rayleigh fading channels than those of ASK or BPSK modulation scheme and have more advantageous for comprehensive spectral efficiency than BFSK modulation scheme. From the viewpoints of further improving their error rate performance over Rayleigh fading channel, this research on BFSK is conducted while introducing new techniques such as use of fading-independency between two keying frequencies to which a pair of balanced ZCZ sequences is allocated, and use of combining techniques with two demodulated outputs obtained by the two ZCZ sequences. Performance formulation and simulation on the proposed system are conducted under the comparison with the other ZCZ-CDMA systems or CDMA systems using the other codes. It will be proved that considerable improvement is achieved with the proposed system.

show abstract

Section: Zcz Codesmentioning

confidence: 99%

A Plural CDMA System with Zero Correlation Zone Codes in Emergency Communication

Huang¹,

Zhang²,

Cao³

et al. 2018

dtcse

View full text Add to dashboard Cite

show abstract

“…In contrast to ordinary CDMA systems based on application of binary sequences [1,[6][7][8][9][10], sequences with a zero-correlation zone [11], and the systems based on applications of chaotic and Gold sequences [12][13][14][15][16][17][18], this paper presents a theoretical model of a noise-based phase shift keying (NPSK) CDMA system that uses random sequences as the carriers of users' information, which allow a higher level of security in signal transmission. Related to this aspect, the system proposed is substantially different from the systems described in literature.…”

Section: Introductionmentioning

confidence: 99%

Noise‐based spreading in code division multiple access systems for secure communications

Berber

2014

Int J Communication

View full text Add to dashboard Cite

Binary spreading sequences or chaotic nonbinary sequences are used in code division multiple access systems. In contrast to those sequences, this paper presents the theory, simulation, and implementation in digital signal processor technology of a code division multiple access system that uses random spreading sequences. The expressions for probability of bit error are derived for the cases when the additive white Gaussian noise and fading are present in the channel. Because the overall transmitted signal is a sum of random signals, the security of signal transmission in this communication system can be enormously increased and will depend on the goodness of the random sequence generator. The developed theory was confirmed by a prototype of the system that was designed in digital signal processor technology. The prototype used spreading sequences that had statistical characteristics very close to the characteristics of theoretical random sequences. The main problem in the system is how to synchronize the received spread sequence with the locally generated sequence. Hence, a mathematical model of the synchronization block for the system has been separately designed and developed. The synchronization procedure has been demonstrated on the basis of application of a periodically repeated pilot sequence. erates a multiuser signal that has characteristics of a white Gaussian noise signal because the spreading is performed using Gaussian random number generator. The system is supposed to have the best possible masking property of the transmitted information contents and the best possible protection of information contents, which depends mostly on the random characteristics of spreading sequences.In practice, it is hard to design a pure random number generator. In order to confirm our theoretical model, we generated Gaussian sequences in the digital signal processor (DSP) prototype by using the random sequences generated by nonlinear feedback shift registers and then transforming them using the Box-Muller method [12]. For this purpose, a prototype of the complete CDMA communication system is developed including noise and fading generators by using TigerSHARC Analog Devices processor as a hardware platform.The theoretical model of the system is developed for the case when the transmitter generates a multiuser signal, composed of N single-user random noise-like signals. The expression for the probability of error is derived, and the characteristics of the system are analyzed, assuming that additive white Gaussian noise (AWGN) and fading are present in the channel [19,20]. A CDMA system with impulse noise in the channel and diversity reception is presented in [21]. The uplink system is analyzed assuming a wide-band multipath channel represented by the delay tapped lines [22].In this system, the received CDMA signal is a mixture of Gaussian sequences, which increases security in signal transmission because it is hard to distinguish and separate message signals from the channel noise. The noise-like random nature of the trans...

show abstract

“…One class of spreading sequences called Zero Correlation Zone (ZCZ) sequences possesses good correlation properties but only in specific zones called Zero Correlation Zone (Z CZ ). There are several intensive studies of CDMA systems using ZCZ sequences sets [1] [3]- [6]. Various classes of ternary ZCZ sequences sets have been constructed [3] [4] and [7]- [13].…”

Section: Introductionmentioning

confidence: 99%

Ternary Zero Correlation Zone Sequence Sets for Asynchronous DS-CDMA

Fassi¹,

Djebbari²,

Taleb‐Ahmed³

2014

View full text Add to dashboard Cite

In this paper we propose a new class of ternary Zero Correlation Zone (ZCZ) sequence sets based on binary ZCZ sequence sets construction. It is shown that the proposed ternary ZCZ sequence sets can reach the upper bound on the ZCZ sequences. The performance of the proposed sequences set in asynchronous Direct Sequence-Code Division Multiple Access (DS-CDMA) system is evaluated. In the simulation we used two types of channels: Additive White Gaussian Noise (AWGN) and frequency non-selective fading with AWGN noise. The proposed ternary ZCZ sequence sets show better results, in term of Bit Error Rate (BER), than Hayashi's ternary ZCZ sequence sets.

show abstract

A ZCZ‐CDMA system with BFSK modulation

Cited by 8 publications

References 16 publications

A Plural CDMA System with Zero Correlation Zone Codes in Emergency Communication

A Plural CDMA System with Zero Correlation Zone Codes in Emergency Communication

Noise‐based spreading in code division multiple access systems for secure communications

Ternary Zero Correlation Zone Sequence Sets for Asynchronous DS-CDMA

Contact Info

Product

Resources

About