Performance of a cellular hybrid C/TDMA mobile radio system applying joint detection and coherent receiver antenna diversity

Blanz, J.J.; Klein, Andreas; Nasshan, M.; Steil, A.

doi:10.1109/49.286664

Cited by 113 publications

(18 citation statements)

References 21 publications

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“…However, in the preceding works, despite these anti-interference techniques, the error rate performance degrades considerably as the number of active users increases above half of the processing gain [3,4,6,7,9,10,12,13,15]. The reason is that these anti-interference techniques fail to provide complete interference removal, despite the existence of a considerably large crosscorrelation between a pair of signatures made by convoluting the transmitted spreading sequences with the respective channel gains.…”

Section: Introductionmentioning

confidence: 95%

“…For CDMA signal demodulation, many anti-interference demodulation systems using a multi-user detection scheme have been proposed [1]. The major techniques are the interference canceller [2][3][4][5], the interference orthogonalizing filter with minimum mean-square-error decision feedback (MMSE-DFB) [6,7], the interference orthogonalizing filter based on minimum output energy (MOE-DFB) [8,9], and the de-correlating detector [1,[8][9][10][11][12]. The present paper provides a significantly improved technique for the decorrelating detector.…”

Section: Introductionmentioning

confidence: 99%

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A multi‐user CDMA receiver utilizing decorrelating detector with additional dummy pilot response

Tomita¹,

Kuroyanagi²,

Ozawa³

et al. 2003

Int J Communication

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SUMMARYA pilot assisted CDMA system which uses extended spreading sequences with guard sequences under a quasi-synchronous condition is capable of separating the interference components included in the input of a de-correlating receiver by solving a system of linear equations. The performance of such a system, however, depends on the property of the de-correlating matrix consisting of the received pilots, which correspond to the respective user spreading sequences and the multi-path channel conditions. That is, the regularity of the matrix often tends to degrade, and the rank reduces occasionally primarily due to the multi-paths, resulting in solutions that are vulnerable to AWGN. The present paper proposes an effective technique to solve this problem by introducing a virtual user into a group of real users that are to be served. The simulation results indicate a remarkable improvement in the bit-error-rate (BER) performance. In addition, based on the BER performance, the system has a RAKE-like function that has power-sum characteristics.

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Section: Introductionmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

A multi‐user CDMA receiver utilizing decorrelating detector with additional dummy pilot response

Tomita¹,

Kuroyanagi²,

Ozawa³

et al. 2003

Int J Communication

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“…In this paper, we propose a packet scheduling algorithm for a multi-cell TD/CDMA system which exploits statistical multiplexing in both time domain (time division) and code domain (code division) [13]. The algorithm combines fair packet loss sharing (FPLS) principle with a received power limited (RPL) power assignment scheme.…”

Section: Introductionmentioning

confidence: 99%

QoS based fair resource allocation in multi-cell TD/CDMA communication systems

Huang

Zhuang

2006

IEEE Trans. Wireless Commun.

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Abstract-In a wireless multimedia code division multiple access (CDMA) system, the resources in terms of transmission rate and power should be efficiently distributed to each user to guarantee its quality-of-service (QoS) requirements. In this paper, a resource allocation algorithm which combines packet scheduling and power assignment is proposed to achieve efficient resource utilization under QoS constraints. The packet scheduling is based on the fair packet loss sharing (FPLS) principle, and the power assignment is determined by the received power limited (RPL) scheme. The basic idea of FPLS is to schedule the transmission of multimedia packets in such a way that all the users have a fair share of packet loss according to their QoS requirements, which maximizes the number of the served users with QoS satisfaction. The RPL scheme minimizes the received power for each packet. Given the propagation path loss, it in turn minimizes the transmitted power as well. The intercell interference from the scheduled packets is also limited in order to increase the system capacity.Index Terms-Code-division multiple access (CDMA), fair packet loss sharing, packet scheduling, quality of service (QoS).

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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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Performance of a cellular hybrid C/TDMA mobile radio system applying joint detection and coherent receiver antenna diversity

Cited by 113 publications

References 21 publications

A multi‐user CDMA receiver utilizing decorrelating detector with additional dummy pilot response

A multi‐user CDMA receiver utilizing decorrelating detector with additional dummy pilot response

QoS based fair resource allocation in multi-cell TD/CDMA communication systems

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

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