Capacity and Coverage Increase With Repeaters in UMTS Urban Cellular Mobile Communication Environment

Sch. of Electr. Eng. & Telecommun., Univ. of New South Wales, Sydney, NSW, Australia
IEEE Transactions on Communications (Impact Factor: 1.99). 11/2005; 53(10):1620 - 1624. DOI: 10.1109/TCOMM.2005.857144
Source: IEEE Xplore


In this letter, we propose to use repeaters to increase system information capacity in urban areas, where path loss exponents are higher (as much as 3.4 or more). There is at least a 10% increase in coverage area when repeaters are placed in every cell within the network to increase system capacity. The overall system information capacity is doubled at propagation exponent 3.7-3.9.

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    • "However, only a limited number of contributions have been reported in open literature, where [8]-[10] are recent rare examples. Ref. [8] proposed for DS-CDMA systems an AaF repeater that can be automatically switched on/off to improve uplink capacity; [9] reported the application of AaF repeaters to boost hot-spot capacity in DS-CDMA networks; and [10] proposed to use AaF repeaters to combat the severe path-loss experienced by UMTS systems in urban areas. Actually the potential of deploying packet repeaters to extend coverage was realized sooner after the initial ALOHA system went into operation [1]. "
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    ABSTRACT: This paper investigates the deployment of amplify-and-forward (AaF) repeaters to enhance slot-ALOHA based random access in a single-cell environment. Based on the concept of ldquovulnerability circlerdquo introduced by Abramson [1], we derive the probability of correct reception of a random access packet originated from any position within the cell. The derived probability enables us to analyze the impact of an AaF repeater on random access throughput within any concerned region. It is shown that an AaF repeater can improve throughput within a limited region surrounding itself at the expense of cell throughput.
    Preview · Conference Paper · Oct 2008
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    • "Ideal maximum ratio combining (MRC) is applied [1], [3], [8]. The work in [9] evaluates the two situations independently, and also another one that is in the middle of them. However, in comparison to classical approaches, in real systems the Rake RX has to perform a delay profile measurement to designate the time offsets of the strongest signal components. "
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    ABSTRACT: This paper addresses the analysis of WCDMA systems with repeaters deployment. A generic and compact expression for up- and downlinks evaluation has been mathematically derived so that transmission powers and other radio resource management parameters can be calculated without simplifications. In particular, the real different path delays, taking into account the repeaters presence and the finite nature of the time window of Rake receivers are considered. This allows an enhanced analysis with respect to classical approaches from a system level viewpoint. Furthermore, higher reliable and accurate predictions on network performance can be obtained, which can be remarkably useful for network planning and management. By using these expressions, relevant network parameters have been evaluated and compared with the ones obtained using the classical approximations. The differences in the obtained metrics are highlighted, putting in evidence the improvement provided by the proposed analysis.
    Full-text · Article · Oct 2007 · IEEE Transactions on Wireless Communications
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    • "Simultaneously the victim receiver will countermine the strong jamming signals with adaptive notch filters, repeat coding and so on [5]. In order to improve the coverage and capacity in cellular networks, repeaters are broadly used as a cost-effective engineering solution [6], [7]. The principle of transparent repeater used in cooperative communications could also be used in the process of repeater jamming design. "
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    ABSTRACT: Direct sequence spread spectrum (DSSS) technique has been widely used in both military communications and commercial communications. On the other hand, it is a challenge to both frequency surveillance and military counter measures. The normal jamming types, including broadband noise, partial-band noise and so on, are ineffective at the current jamming power level when the processing gain is large enough. This paper proposes a design of the repeater jamming based on radio frequency memory (RFM). The jamming effect of repeater jamming on victim receiver's code acquisition is discussed, and the bit error probabilities of the DSSS system interfered by repeater jamming both in non fading environment and Rayleigh fading environment are obtained. Moreover, the jamming range of the repeater jamming is mentioned. The results of simulation show the deduction is right. The repeater jamming proposed in this paper is a kind of correlative jamming types which are more effective than normal jamming types, and it can be used to enhance distributed networked jamming systems in the field of DSSS communication countermeasures.
    Full-text · Conference Paper · Jul 2007
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