IEEE Organizations related to Direct-sequence code-division multiple access

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Conferences related to Direct-sequence code-division multiple access

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ICC 2021 - IEEE International Conference on Communications

IEEE ICC is one of the two flagship IEEE conferences in the field of communications; Montreal is to host this conference in 2021. Each annual IEEE ICC conference typically attracts approximately 1,500-2,000 attendees, and will present over 1,000 research works over its duration. As well as being an opportunity to share pioneering research ideas and developments, the conference is also an excellent networking and publicity event, giving the opportunity for businesses and clients to link together, and presenting the scope for companies to publicize themselves and their products among the leaders of communications industries from all over the world.


2020 IEEE International Conference on Image Processing (ICIP)

The International Conference on Image Processing (ICIP), sponsored by the IEEE SignalProcessing Society, is the premier forum for the presentation of technological advances andresearch results in the fields of theoretical, experimental, and applied image and videoprocessing. ICIP 2020, the 27th in the series that has been held annually since 1994, bringstogether leading engineers and scientists in image and video processing from around the world.


2020 IEEE International Conference on Systems, Man, and Cybernetics (SMC)

The 2020 IEEE International Conference on Systems, Man, and Cybernetics (SMC 2020) will be held in Metro Toronto Convention Centre (MTCC), Toronto, Ontario, Canada. SMC 2020 is the flagship conference of the IEEE Systems, Man, and Cybernetics Society. It provides an international forum for researchers and practitioners to report most recent innovations and developments, summarize state-of-the-art, and exchange ideas and advances in all aspects of systems science and engineering, human machine systems, and cybernetics. Advances in these fields have increasing importance in the creation of intelligent environments involving technologies interacting with humans to provide an enriching experience and thereby improve quality of life. Papers related to the conference theme are solicited, including theories, methodologies, and emerging applications. Contributions to theory and practice, including but not limited to the following technical areas, are invited.


2020 IEEE International Symposium on Circuits and Systems (ISCAS)

The International Symposium on Circuits and Systems (ISCAS) is the flagship conference of the IEEE Circuits and Systems (CAS) Society and the world’s premier networking and exchange forum for researchers in the highly active fields of theory, design and implementation of circuits and systems. ISCAS2020 focuses on the deployment of CASS knowledge towards Society Grand Challenges and highlights the strong foundation in methodology and the integration of multidisciplinary approaches which are the distinctive features of CAS contributions. The worldwide CAS community is exploiting such CASS knowledge to change the way in which devices and circuits are understood, optimized, and leveraged in a variety of systems and applications.


2020 IEEE International Symposium on Electromagnetic Compatibility & Signal/Power Integrity (EMCSI)

This symposium pertains to the field of electromagnetic compatibility.


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Periodicals related to Direct-sequence code-division multiple access

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Broadcasting, IEEE Transactions on

Broadcast technology, including devices, equipment, techniques, and systems related to broadcast technology, including the production, distribution, transmission, and propagation aspects.


Circuits and Systems I: Regular Papers, IEEE Transactions on

Part I will now contain regular papers focusing on all matters related to fundamental theory, applications, analog and digital signal processing. Part II will report on the latest significant results across all of these topic areas.


Communications Letters, IEEE

Covers topics in the scope of IEEE Transactions on Communications but in the form of very brief publication (maximum of 6column lengths, including all diagrams and tables.)


Communications Magazine, IEEE

IEEE Communications Magazine was the number three most-cited journal in telecommunications and the number eighteen cited journal in electrical and electronics engineering in 2004, according to the annual Journal Citation Report (2004 edition) published by the Institute for Scientific Information. Read more at http://www.ieee.org/products/citations.html. This magazine covers all areas of communications such as lightwave telecommunications, high-speed data communications, personal communications ...


Communications Surveys & Tutorials, IEEE

Each tutorial reviews currents communications topics in network management and computer and wireless communications. Available tutorials, which are 2.5 to 5 hours in length contains the original visuals and voice-over by the presenter. IEEE Communications Surveys & Tutorials features two distinct types of articles: original articles and reprints. The original articles are exclusively written for IEEE Communications Surveys & Tutorials ...


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Most published Xplore authors for Direct-sequence code-division multiple access

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Xplore Articles related to Direct-sequence code-division multiple access

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Multi-Rate De-Spreading Code

2007 IFIP International Conference on Wireless and Optical Communications Networks, 2007

An efficient methodology to construct direct sequence code division multiple access (DS-CDMA) de-coding scheme has been investigated. System correlation performance is provided and analyzed. Since the perfect orthogonal codes, such as Walsh code, are difficult to obtain massively in conventional DS-CDMA system. To increase the number of spreading code utilized in system, we usually adopt sub-orthogonal codes, such as Gold ...


Blind joint equalization and multiuser detection in dispersive MC-CDMA/MC-DS-CDMA/MT-CDMA channels

MILCOM 2002. Proceedings, 2002

The problem of demodulation of multiuser orthogonal frequency division multiplex-code division multiple access (OFDM-CDMA) in the presence of both multiple access interference (MAI) and intersymbol interference (ISI) is considered. Three types of OFDM-CDMA are presented: multicarrier code division multiple access (MC-CDMA), multicarrier direct sequence code division multiple access (MC-DS-CDMA) and multi-tone code division multiple access (MT-CDMA). The dispersive OFDM-CDMA channel ...


An adaptive PIC receiver with diversity combining for MC-DS-CDMA system

2003 IEEE 58th Vehicular Technology Conference. VTC 2003-Fall (IEEE Cat. No.03CH37484), 2003

An adaptive parallel interference cancellation (PIC) receiver with pre and post diversity combining for the multi-carrier direct sequence code division multiple access (MC-DS-CDMA) system is presented and its performance investigated. By taking advantage of the combining techniques before and after the adaptive PIC stage, the diversity provided by the MC-DS-CDMA system can be exploited to improve further the bit error ...


Frequency-Domain Multiuser Detection for CP-Assisted DS-CDMA Signals

2006 IEEE 63rd Vehicular Technology Conference, 2006

In this paper we consider the use of CP-assisted (cyclic prefix) DS-CDMA schemes (direct sequence code division multiple access) in broadband wireless systems. We present an iterative, frequency-domain MUD (multiuser detection) receiver for the uplink transmission that combines IB-DFE (iterative block decision feedback equalization) principles with serial interference cancellation. It is shown that the performance proposed receiver can be close ...


Improving performance of adaptive media access control protocols for high-density wireless networks

Proceedings Fourth International Symposium on Parallel Architectures, Algorithms, and Networks (I-SPAN'99), 1999

The problems of intermittent disconnection, high error rate and collision in high-density wireless networks cause degradation in the performance of wireless media access control protocols, such as slotted ALOHA Time Division Multiple Access (slotted ALOHA/TDMA) and Direct Sequence Code Division Multiple Access (DS/CDMA). We propose adaptive techniques for improving performance of media access protocols through awareness of the mobile communication ...


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Educational Resources on Direct-sequence code-division multiple access

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IEEE-USA E-Books

  • Multi-Rate De-Spreading Code

    An efficient methodology to construct direct sequence code division multiple access (DS-CDMA) de-coding scheme has been investigated. System correlation performance is provided and analyzed. Since the perfect orthogonal codes, such as Walsh code, are difficult to obtain massively in conventional DS-CDMA system. To increase the number of spreading code utilized in system, we usually adopt sub-orthogonal codes, such as Gold sequences. Although the number of codes is extensively increased, the multiple access interference (MAI) problem has to be treated more carefully. Especially while lots of users access the DS-CDMA system at the same time. In this study, we proposed a CDMA de-spreading scheme worked in receiver part The MAI can be treated efficiently in the proposed multi-rate de-spreading scheme.

  • Blind joint equalization and multiuser detection in dispersive MC-CDMA/MC-DS-CDMA/MT-CDMA channels

    The problem of demodulation of multiuser orthogonal frequency division multiplex-code division multiple access (OFDM-CDMA) in the presence of both multiple access interference (MAI) and intersymbol interference (ISI) is considered. Three types of OFDM-CDMA are presented: multicarrier code division multiple access (MC-CDMA), multicarrier direct sequence code division multiple access (MC-DS-CDMA) and multi-tone code division multiple access (MT-CDMA). The dispersive OFDM-CDMA channel is first cast into a multiple input multiple output (MIMO) signal framework. Then, using a subspace method, it is shown that each user's channel impulse response can be estimated using the knowledge of the user's signature waveform. It is further shown that, using the user's channel impulse response and the identified signal subspace, a blind linear minimum mean square error (MMSE) detector and a blind zero-forcing decorrelator detector can be constructed in closed form. The proposed detectors are attractive for their higher spectral efficiency, which is achieved by the elimination of cyclic prefix and training sequences. Further a comparison of MC-CDMA/MC-DS-CDMA/MT-CDMA with direct sequence code division multiple access (DS-CDMA) is then presented. The paper's major contribution is the development of the sub-space blind techniques.

  • An adaptive PIC receiver with diversity combining for MC-DS-CDMA system

    An adaptive parallel interference cancellation (PIC) receiver with pre and post diversity combining for the multi-carrier direct sequence code division multiple access (MC-DS-CDMA) system is presented and its performance investigated. By taking advantage of the combining techniques before and after the adaptive PIC stage, the diversity provided by the MC-DS-CDMA system can be exploited to improve further the bit error probability performance and increase the user/data capacity. Results show that this adaptive PIC receiver outperforms the conventional PIC receiver for MC-DS-CDMA systems. However, our studies reveal that this can only be achieved with the appropriate selection of the step size and the choice of initial weights, especially when the processing gain is low. Results also show that the advantage of using the adaptive PIC beyond the first stage of the multi-stage interference cancellation structure is only apparent when the level of MAI is high.

  • Frequency-Domain Multiuser Detection for CP-Assisted DS-CDMA Signals

    In this paper we consider the use of CP-assisted (cyclic prefix) DS-CDMA schemes (direct sequence code division multiple access) in broadband wireless systems. We present an iterative, frequency-domain MUD (multiuser detection) receiver for the uplink transmission that combines IB-DFE (iterative block decision feedback equalization) principles with serial interference cancellation. It is shown that the performance proposed receiver can be close to the single-user MFB (matched filter bound), even for fully loaded systems, in severely time-dispersive channel and/or in the presence of strong interfering signals

  • Improving performance of adaptive media access control protocols for high-density wireless networks

    The problems of intermittent disconnection, high error rate and collision in high-density wireless networks cause degradation in the performance of wireless media access control protocols, such as slotted ALOHA Time Division Multiple Access (slotted ALOHA/TDMA) and Direct Sequence Code Division Multiple Access (DS/CDMA). We propose adaptive techniques for improving performance of media access protocols through awareness of the mobile communication environment. These techniques involve detection of intermittent disconnection, high error rates, and collisions. Upon detection and notification of these conditions by snooping devices, the media access control layer adapts its operation and synchronization accordingly to reduce delay and loss of bandwidth. Results from our simulation studies show that adaptive TDMA improves performance by as much as 12 times over basic TDMA and adaptive CDMA improves by as much as 4 times over basic CDMA in wireless network with high population cells. Overall, adaptive CDIMA still performs better than adaptive TDMA by about 4 times.

  • Performance of code division multiple access (CDMA) systems in Nakagami multipath fading channel

    Multicarrier CDMA system is characterized by a simpler receiver structure than the conventional RAKE receiver. Most of previous studies evaluated the performance of the MC-CDMA system in a Rayleigh multipath fading channel. This paper compares the performance of a RAKE receiver and MC-CDMA system in a Nakagami multipath fading. The Nakagami model, known as the m-distribution model, is a generalized model as it includes Gaussian, Rayleigh and Rice fading as special cases by changing the Nakagami parameter m. On the other hand, the Nakagami model has been shown by many in the literature to be the closest model to the indoor mobile radio channel. According to our analysis, we found that the MC-CDMA system outperforms the practical RAKE receiver, in which the number of RAKE fingers is less than the maximum resolvable paths of the channel. Moreover, the MC-CDMA system outperforms the RAKE receiver in lower diffusive channels.

  • DS-CDMA, MC-CDMA and MT-CDMA for mobile multi-media communications

    We present a comparison between direct sequence code division multiple access (DS-CDMA), multi-carrier (MC-) CDMA and multitone (MT-) CDMA schemes in terms of the transmitter and receiver structure. We discuss their down-link bit error rate performance in a frequency selective Rayleigh fading channel by computer simulation.

  • CDMA2000 for a satellite environment

    CDMA2000 is the American telecommunication standard for 3G. It is a wideband spread spectrum radio interface designed to provide high data rates and multimedia services to the wireless user. It has two modes of operation, 1X (DS-CDMA) and 3X (MC-CDMA). In this paper, we compare the forward link performance of the two modes for a satellite environment. In order to focus our comparison on the transmission technology (DS-CDMA, MC-CDMA), two services with similar data rates and the same coding scheme, are studied.

  • Design and performance of OFDM-CDMA system in fading channels

    None

  • OPTIMAL SOFT MULTI-USER DECODING FOR VECTOR QUANTIZATION IN A SYNCHRONOUS CDMA SYSTEM

    None



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