Slow frequency-hopping multicarrier DS-CDMA for transmission over Nakagami multipath fading channels

Yang, Lie‐Liang; Hanzo, Lajos

doi:10.1109/49.932690

Cited by 36 publications

(7 citation statements)

References 25 publications

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“…Alternatively, multiuser detection (MUD) can be invoked in order to approach the single-user bound. In contrast to the transmitter side, where only U out of Q subcarriers are transmitted by a user, at the receiver different detector structures might be implemented based on the availability [4] or lack [5] of the FH pattern information. During the FH pattern acquisition stage, which usually happens at the beginning of transmission or during handover, tentatively all Q subcarriers can be demodulated.…”

Section: Broadband Mobile Wireless Accessmentioning

confidence: 99%

“…In slow FH several symbols are transmitted after each FH, while in fast FH several frequency hops take place in a symbol duration; each symbol is transmitted using several subcarriers, and hence diversity can be achieved by combining these subcarrier signals. Moreover, from a networking point of view, random, uniform, and adaptive FH schemes can be utilized [4] in order to maximize the efficiency of the network. In the context of random FH, the subcarriers associated with each transmission of a user are determined by the set of preassigned FH patterns constituting a group of constant-weight codewords.…”

Section: Fh Strategymentioning

confidence: 99%

“…In the first part of this treatise a broadband multiple access candidate scheme meeting the above requirements is presented, which is constituted by frequency-hopping (FH)-based multicarrier direct sequence (DS) CDMA (FH/MC DS-CDMA) [4,5]. Recent investigations demonstrated that channel-quality controlled rate adaptation is an efficient strategy for attaining the highest possible spectral efficiency in terms of bits per second per Hertz [6,7], while maintaining a certain target integrity.…”

Section: Introductionmentioning

confidence: 99%

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Software-defined-radio-assisted adaptive broadband frequency hopping multicarrier DS-CDMA

Yang

Hanzo

2002

IEEE Commun. Mag.

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Against the backdrop of the explosive expansion of the Internet and the continued dramatic increase in demand for high-speed multimedia wireless services, there is an urgent demand for flexible, bandwidth-efficient transceivers. Multistandard operation is also an important requirement for the future generations of wireless systems. This article presents a versatile broadband multiple access scheme, combining frequency hopping with multicarrier DS-CDMA (FH/MC DS-CDMA). In the short term, the proposed FH/MC DS-CDMA scheme could be employed in the existing second-and third-generation CDMA system bands. Hence, it has the potential of supporting compatibility with these existing systems. This article also shows that FH/MC DS-CDMA exhibits a high grade of flexibility in the context of system design and parameter reconfiguration. Therefore, in the long term, the proposed FH/MC DS-CDMA scheme is capable of meeting the requirements of future broadband mobile wireless systems, with the aid of introducing more advanced techniques facilitated by the employment of software-defined radios (SDR) and with the advent of efficient adaptive baseband algorithms.

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Section: Broadband Mobile Wireless Accessmentioning

confidence: 99%

Section: Fh Strategymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Software-defined-radio-assisted adaptive broadband frequency hopping multicarrier DS-CDMA

Yang

Hanzo

2002

IEEE Commun. Mag.

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“…The optimization of receiver and transmitter structure without the knowledge of channel status information (CSI) has also been investigated for high rate transmission, although the improvement is limited [5]. Recently, adaptive transmission schemes have been proposed for further performance improvement [6]- [8].…”

mentioning

confidence: 99%

A Truncated Adaptive Transmission Scheme for Hybrid Multicarrier CDMA/FDM Systems in Forward Link

Kim¹,

Song

Lee

et al. 2005

IEEE Trans. Veh. Technol.

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Abstract-A truncated adaptive transmission scheme for the hybrid multicarrier CDMA/FDM system is considered in forward link. In the proposed scheme, a data substream is transmitted over the subchannels of which the channel gains are greater than a given threshold, based on the feedback information from the mobile station. We analyze the performance of the proposed system when orthogonal and random signature sequences are used in single-and multiple-cell environment. In the single-cell environment, when orthogonal signature sequences are used, the proposed scheme outperforms the adaptive FH/DS system as well as the conventional MC DS/CDMA system, and accommodates more users than the adaptive FH/DS system while maintaining the orthogonality between users. In the multiple-cell environment also, the proposed scheme has better performance characteristics than the adaptive FH/DS system when orthogonal or random codes are used as spreading sequences.

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“…After early success in this area [4]- [6], some more sophisticated sequence design regimes were developed, for example by invoking hierarchical orthogonal subsets [7], or by adding a feedback mechanism for adapting the spreading sequences [8], [9]. Another promising technique relies on the design of an optimum multiuser detector (MUD).…”

Section: Introductionmentioning

confidence: 99%

Cutoff Rate of Sparse Code Multiple Access in Downlink Broadcast Channels

Wang

et al. 2017

IEEE Trans. Commun.

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Abstract-For the sake of supporting massive connectivity in future 5G networks, non-orthogonal multiple access (NOMA) techniques are advocated. As a promising NOMA technique, in recent years sparse code multiple access (SCMA) has attracted substantial attention. However, there is a paucity of studies on the theoretical analysis of its error-freely achievable data rate, especially in the downlink context. Hence, we derive the cutoff rate of SCMA in downlink broadcast channels, which indicates the lower-bound of a system's errorfreely achievable rate. However, we will demonstrate that when considering the conventional categorization of pairwise error events, the accuracy of the cutoff rate rapidly degrades in the low-SNR region owing to the fact that multi-user SCMA systems typically encounter an extremely large constellation size. Alternatively, by invoking Bergmans' concept from 1973 in the categorization of pairwise error events, we obtain a more accurate cutoff rate both in the low-and the high-SNR regions. Moreover, we provide insights into the cutoff rate derivation process, which reveals some general guidelines for designing a beneficial codebook, capable of improving SCMA with respect to its original low-density signature (LDS) based counterpart.

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Slow frequency-hopping multicarrier DS-CDMA for transmission over Nakagami multipath fading channels

Cited by 36 publications

References 25 publications

Software-defined-radio-assisted adaptive broadband frequency hopping multicarrier DS-CDMA

Software-defined-radio-assisted adaptive broadband frequency hopping multicarrier DS-CDMA

A Truncated Adaptive Transmission Scheme for Hybrid Multicarrier CDMA/FDM Systems in Forward Link

Cutoff Rate of Sparse Code Multiple Access in Downlink Broadcast Channels

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