Generalized Pairwise Z-Complementary Codes

Feng, Lifang; Fan, Pingzhi; Tang, Xiaohu; Loo, Kok-Keong

doi:10.1109/lsp.2008.919997

Cited by 46 publications

(1 citation statement)

References 7 publications

(6 reference statements)

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“…On the other hand, orthogonal sequences can speed up the number of transmit-receive pairs that can be processed in parallel. In the last decades, a tremendous effort has been placed in the development of sequences which have both good autocorrelation and orthogonality properties [47][48][49][50][51][52]. Most of this effort has been stemmed by the field of communication technology with development of techniques such as in code division multiple access (CDMA).…”

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confidence: 99%

Simultaneous transmission and reception on all elements of an array: binary code excitation

Isla

Cegla

2019

Proc. R. Soc. A.

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Pulse-echo arrays are used in radar, sonar, seismic, medical and non-destructive evaluation. There is a trend to produce arrays with an ever-increasing number of elements. This trend presents two major challenges: (i) often the size of the elements is reduced resulting in a lower signal-to-noise ratio (SNR) and (ii) the time required to record all of the signals that correspond to every transmit–receive path increases. Coded sequences with good autocorrelation properties can increase the SNR while orthogonal sets can be used to simultaneously acquire all of the signals that correspond to every transmit–receive path. However, a central problem of conventional coded sequences is that they cannot achieve good autocorrelation and orthogonality properties simultaneously due to their length being limited by the location of the closest reflectors. In this paper, a solution to this problem is presented by using coded sequences that have receive intervals. The proposed approach can be more than one order of magnitude faster than conventional methods. In addition, binary excitation and quantization can be employed, which reduces the data throughput by roughly an order of magnitude and allows for higher sampling rates. While this concept is generally applicable to any field, a 16-element system was built to experimentally demonstrate this principle for the first time using a conventional medical ultrasound probe.

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mentioning

confidence: 99%

Simultaneous transmission and reception on all elements of an array: binary code excitation

Isla

Cegla

2019

Proc. R. Soc. A.

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An Algorithm for Synthesis of Families of Generalized Orthogonal Complementary Pairs

Bedzhev

Iliev

2010

Technological Developments in Networking, Education and Automation

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New Signature Waveforms for Multi-rate QS-CDMA System with QPSK Modulation

Feng

Fan

Loo

et al. 2009

Wireless Pers Commun

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This paper presents a multi-rate quasi-synchronous CDMA (QS-CDMA) system with QPSK modulation based on the new signature waveforms, namely GPZ-chip waveforms which are constructed by the generalized pairwise Z-complementary (GPZ) codes and optimal chip waveforms. According to the properties of GPZ-chip waveforms, the multiple access interference of different users can be reduced or eliminated. The interferences among different streams of the same user are handled by an optimal (or suboptimal) multi-stream detector(s). The performance of the proposed system is simulated and analyzed in a cellular communication environment consisting of multipath fading. The result shows that the proposed system has similar performance as compared to the single-rate QS-CDMA system employing GPZ codes with one chip waveform due to the properties of multi-stream detection. Also, the proposed system can achieve a significant interference reduction as compared to the 123 274 L. Feng et al. multi-rate system employing concatenated WH/m sequence sets with one chip waveform due to the zero correlation zone properties of the GPZ-chip waveforms, thus resulting better BER performance.

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Generalized Pairwise Z-Complementary Codes

Cited by 46 publications

References 7 publications

Simultaneous transmission and reception on all elements of an array: binary code excitation

Simultaneous transmission and reception on all elements of an array: binary code excitation

An Algorithm for Synthesis of Families of Generalized Orthogonal Complementary Pairs

New Signature Waveforms for Multi-rate QS-CDMA System with QPSK Modulation

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