On the capacity of a cellular CDMA system

Gilhousen, K. S.; Jacobs, I. M.; Padovani, R.; Viterbi, Andrew J.; Weaver, L. A.; Wheatley, C.E.

doi:10.1109/25.289411

Cited by 2,671 publications

(892 citation statements)

References 4 publications

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“…The eefect of fading channel significantly degrades the performance of CDMA systems because communication over fading channels require higher power levels, and thus producing higher unwanted multiple access interference among CDMA users. The near-far problem can be obercome by an open loop power control algorithm, while the effect of multiple access interference due to multipath fading requires a closedloop algorithm when the uplink and downlink frequencies are not the same in a frequency duplexing (FDD) scheme [1].…”

Section: Introductionmentioning

confidence: 99%

Improved Predictive Power Control of Cdma System in Rayleigh Fading Channel

Kurniawan

Machdar

2010

MST

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In this paper an improved prediction-based power control is proposed for code division multiple access (CDMA) systems in Rayleigh fading channel environments. One of the most serious problems which degrades the performance of power control algorithm is the effect of feedback delay. To overcome the effect of feedback delay, power control needs to employ prediction algorithm which utilises the correlation property of the past channel samples measurements to predict the future sample values. In CDMA power control, however, the correlation property of channel measurements is destroyed because the transmit power is continuously updated for each power control interval. The prediction algorithm in this paper uses the recursive least square (RLS) technique and an improved predictor algorithm is proposed to compensate for the channel correlation. The result shows that the performance of improved predictive power control proposed in this paper evaluated in terms of bit error rate (BER) as a function of bit energy-tointerference power density ratio E b /I o improved significantly from that of the conventional predictor.

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Section: Introductionmentioning

confidence: 99%

Improved Predictive Power Control of Cdma System in Rayleigh Fading Channel

Kurniawan

Machdar

2010

MST

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“…This activity is stimulated partly by the success of the Qualcomm code division multiple access (CDMA) system [GJP91], [Qua91] and the European GSM system [HaS92], partly by the rapidly growing wireless market, and partly by the ability of VLSI technology to implement very sophisticated systems inexpensively. While it is not difficult to learn about the particular systems being implemented today, it is quite difficult to contrast the basic merits of these approaches.…”

Section: Introductionmentioning

confidence: 99%

An Inequality on the Capacity Region of Multiaccess Multipath Channels

Gallager

1994

Communications and Cryptography

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The effects of multiaccess sources and time varying multipath are considered in analyzing a system in which multiple sources communicate with a fixed base station. We discuss detection and the use of stripping in a multiaccess multipath environment. We finally derive a capacity for these systems. It turns out that CDMA type systems are inherently capable (theoretically) of higher rates than systems such as slow frequency hopping that maintain orthogonality between users.

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“…This is the same expression used in [15]. Considering that each technology has independent resources, the feasible combination of data and voice users can be calculated for each technology separately.…”

Section: State Spacementioning

confidence: 99%

Optimal Joint Call Admission Control with Vertical Handoff on Heterogeneous Networks

et al. 2011

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Abstract.A joint management of radio resources in heterogeneous networks is considered to raise efficiency. In this paper we focus on joint schemes for admission control and access technology selection using vertical handoff. We study a system where both streaming and elastic traffic are supported, and two radio access technologies covering the same areas are available: TDMA and WCDMA. Optimal solutions for different optimization criteria which can be expressed in terms of blocking probabilities and throughput are found and properly described, and a new heuristic policy is proposed. Finally, in order to provide some understanding of the cost of a single vertical handoff, a new optimization criteria is defined where its cost is found in relation to that of voice and data blocking.

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On the capacity of a cellular CDMA system

Cited by 2,671 publications

References 4 publications

Improved Predictive Power Control of Cdma System in Rayleigh Fading Channel

Improved Predictive Power Control of Cdma System in Rayleigh Fading Channel

An Inequality on the Capacity Region of Multiaccess Multipath Channels

Optimal Joint Call Admission Control with Vertical Handoff on Heterogeneous Networks

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