Application of turbo-codes to a CDMA mobile radio system using joint detection and antenna diversity

Jung, Peter; Nasshan, M.; Blanz, J.J.

doi:10.1109/vetec.1994.345194

Cited by 21 publications

(7 citation statements)

References 13 publications

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“…Jung and Nasshan [88], [89] characterized the achievable turbo-coded performance under the constraints of short transmission frame lengths, which is characteristic of interactive speech systems. In collaboration with Blanz, they also applied turbo codes to a CDMA system using joint detection and antenna diversity [90]. Barbulescu and Pietrobon addressed the issues of interleaver design [91].…”

Section: Historical Perspective On Channel Codingmentioning

confidence: 99%

Space-time codes and concatenated channel codes for wireless communications

Liew¹,

Hanzo²

2002

Proc. IEEE

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Section: Historical Perspective On Channel Codingmentioning

confidence: 99%

Space-time codes and concatenated channel codes for wireless communications

Liew¹,

Hanzo²

2002

Proc. IEEE

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“…This shows a comparison between turbo coders using several block interleavers with frame-lengths of approximately 190 b. The block interleaver, proposed for short frame transmission systems in [37] and used by the same authors in other papers such as [34], [38], [39], clearly has a somewhat lower performance than the other block interleavers, which use an odd number of rows and columns. It is also interesting to note that of the two block interleavers with an odd number of rows and columns, the interleaver which is closer to being square (i.e., the interleaver) performs better than the more rectangular interleaver.…”

Section: F the Effect Of The Interleavermentioning

confidence: 99%

“…Jung and Naßhan [36], [34] characterized the coded performance under the constraints of short transmission frame length, which is characteristic of speech systems. In collaboration with Blanz, they also applied turbo codes to a CDMA system using joint detection and antenna diversity [39]. Barbulescu and Pietrobon addressed the issues of interleaver design [31].…”

Section: Introductionmentioning

confidence: 99%

Comparative study of turbo decoding techniques: an overview

Woodard

Hanzo

2000

IEEE Trans. Veh. Technol.

259

140

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Abstract-In this contribution, we provide an overview of the novel class of channel codes referred to as turbo codes, which have been shown to be capable of performing close to the Shannon Limit. We commence with a brief discussion on turbo encoding, and then move on to describing the form of the iterative decoder most commonly used to decode turbo codes. We then elaborate on various decoding algorithms that can be used in an iterative decoder, and give an example of the operation of such a decoder using the so-called Soft Output Viterbi Algorithm (SOVA). Lastly, the effect of a range of system parameters is investigated in a systematic fashion, in order to gauge their performance ramifications.

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“…These JD receivers were also combined with coherent receiver antenna diversity techniques [54]- [57] and turbo coding [58], [59] for performance improvement. JD receivers were proposed also for downlink scenarios by Nasshan et al [60], [61].…”

Section: ) Joint Detection Conceptmentioning

confidence: 99%

Burst-by-burst adaptive multiuser detection cdma: a framework for existing and future wireless standards

Kuan

Hanzo

2003

Proc. IEEE

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This paper provides a broad overview of the multiuser detection literature of the past few years in a nonmathematical, easily accessible approach. The treatment is then extended to the comparative study of channel-quality controlled burst-by-burst (BbB) adaptive code division multiple access (CDMA) detection such as parallel interference cancellation, successive interference cancellation, and joint detection (JD I. MOTIVATIONMobile propagation channels exhibit time-variant propagation properties [1]. Although, apart from simple cordless telephoneschemes,mostmobileradiosystemsemploypowercontrol for mitigating the effects of received power fluctuations, rapid channel quality fluctuations cannot be compensated by practical, finite reaction-time power control schemes. Furthermore, the ubiquitous phenomenon of signal dispersion due to the multiplicity of scatering and reflecting objects cannot be mitigated by power control. Similarly, other performance lim- iting factors, such as adjacent-channel and cochannel intereference as well as multiuser interference (MUI) vary as a function of time. The ultimate channel quality metric is the bit-error rate (BER), regardless of the specific channel impairments encountered. The channel quality variations are typically higher near the fringes of the propagation cell or when moving from an indoor scenario to an outdoor cell due to the high standard deviation of the shadow fading and fast fading [1] encountered, even in conjunction with agile power control. Furthermore, the bit errors typically occur in bursts due to the time-variant channel quality fluctuations; hence, it is plausible that a fixed transceiver mode cannot achieve a high flexibility in such environments. The design of powerful and flexible transceivers [2]-[4] has to be based on finding the best compromise among a number of contradicting design factors [2]- [4]. Some of these factors are low power consumption, high robustness against transmission errors among various channel conditions, high spectral efficiency, low-delay for the sake of supporting interactive real-time multimedia services, high-capacity networking, and so forth [5]. In this paper, we will address a few of these issues in the context of direct sequence code division multiple access [6] (DS-CDMA) systems, 1 since CDMA is the solution standardized in all three recently ratified global mobile 1 The simple philosophy of DS-CDMA is that a binary bit of a user is signaled to the receiver with the aid of a unique, user-specific signature sequence. The DS spreading sequences may be chosen such that they are orthogonal to each other; hence, the individual users' signals do not interfere with each other, provided that the transmission channel does not destroy the orthogonality of the DS spreading sequences. When the orthogonality of the DS spreading codes is retained at the receiver, no MUI is inflicted; hence, a simple correlator is capable of detecting the codes of the users conveying the information with the aid of the code's polarity. By contrast, if the...

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Application of turbo-codes to a CDMA mobile radio system using joint detection and antenna diversity

Cited by 21 publications

References 13 publications

Space-time codes and concatenated channel codes for wireless communications

Space-time codes and concatenated channel codes for wireless communications

Comparative study of turbo decoding techniques: an overview

Burst-by-burst adaptive multiuser detection cdma: a framework for existing and future wireless standards

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