Downlink performance of a CDMA system with distributed base station

Hasegawa, Ryô; Masashige, Shirakabe; Esmailzadeh, Riaz; Nakagawa, Masao

doi:10.1109/vetecf.2003.1285147

Cited by 29 publications

(13 citation statements)

References 4 publications

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“…An alternative strategy is to try to reduce the overall transmit power (and hence othercell interference) using distributed antennas, which has the additional merit of providing better coverage and increasing battery life [2]. Although distributed antennas systems (DAS) were originally introduced to simply cover the dead spots in indoor wireless communications [3], recent studies have identified other potential advantages such as reduced power and increased system capacity [4]- [9].…”

mentioning

confidence: 99%

“…There are also few papers that consider the advantages of DAS in a multicell context. A recent paper [9] addressed downlink performance of code division multiple access (CDMA) DAS in a multiple cell environment, but it relied on computer simulations and only investigated SIR levels perceived at mobile stations. Computer simulations are useful but mathematical analysis enables us to efficiently identify the key design parameters and to understand their effects.…”

mentioning

confidence: 99%

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Downlink performance and capacity of distributed antenna systems in a multicell environment

Choi

Andrews

2007

IEEE Trans. Wireless Commun.

567

429

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Abstract-Distributed antenna systems (DAS) have been widely implemented in state-of-the art cellular communication systems to cover dead spots. Recent academic studies have shown that in addition to coverage improvements, DAS can also have potential advantages such as reduced power and increased system capacity in a single cell environment. This paper analytically quantifies downlink capacity of multicell DAS for two different transmission strategies: selection diversity (where just one or two of the distributed antennas are used) and blanket transmission (where all antennas in the cell broadcast data). Simple repeaters are a special case of our analysis. A generalized information theoretic analysis is provided to illuminate the fundamental limits of such systems in the cellular context. The results show that DAS reduces other-cell interference in a multicell environment and hence significantly improves capacity (by about 2x), with particularly large improvements for users near cell boundaries. Less obviously, from a communication theory standpoint, it is shown that selection diversity is preferable to blanket transmission in terms of achievable ergodic capacity. For blanket transmission, we show that the optimal transmission strategy is just phase steering due to the per antenna module power constraints in DAS.

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confidence: 99%

mentioning

confidence: 99%

Downlink performance and capacity of distributed antenna systems in a multicell environment

Choi

Andrews

2007

IEEE Trans. Wireless Commun.

567

429

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“…All mobiles are assumed to transmit at the maximum power, and the power is subdivided equally among all subcarriers allocated to the mobile. The channel gain over subcarrier i corresponding to user k is given by: (8) In Equation (8), the first factor captures propagation loss, with κ a constant chosen to be 128.1 dB, d k the distance in km from mobile k to the nearest RRH in a distributed BS scenario, or to the BS in a centralised BS scenario, and λ the path loss exponent, which is set to a value of 3.76. The second factor, ξ k,i , captures log-normal shadowing with an 8 dB standard deviation, whereas the last factor, F k,i , corresponds to Rayleigh fading with a Rayleigh parameter b such that E[b 2 ] = 1.…”

Section: Simulation Modelmentioning

confidence: 99%

Uplink scheduling in LTE systems using distributed base stations

Yaacoub

Dawy

2010

Trans Emerging Tel Tech

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SUMMARYUplink scheduling in Long-Term Evolution (LTE) systems with distributed base stations (DBSs) is considered. In the proposed model, users are connected to remote radio heads (RRHs) deployed throughout the cell and connected to a central base station. Centralised and distributed scheduling with a DBS are compared to centralised scheduling with a central base station. Monte Carlo simulation results show that LTE systems with DBSs achieve better throughput than systems with conventional base stations while allowing edge users better chances of accessing the resources.

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“…was conducted in [2]. Other proposed systems include: an enhanced ad-hoc (Global System for Mobile communications) GSM network [3], a Unified Cellular and Ad-Hoc Network architecture using 802.11-based peerto-peer links [4], an Integrated Cellular and Ad Hoc Relaying system which dynamically balances the traffic heterogeneity among cells [5], a Multihop Cellular system where every mobile user participates in relaying [6], a UTRA TDD system augmented by Intelligent Relaying capability [7], fixed relay systems [8] - [9], and wired relay systems [10]. The relay routing was researched by [11] and the DownLink (DL) throughput in [12].…”

Section: Introductionmentioning

confidence: 99%

Analysing a Multi-hop UMTS over Multiple Frequency Schemes and an Urban Environment

Κωνσταντίνου¹,

Imran²,

Tzaras³

2008

JNW

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Abstract-In this paper we analyse the performance of a relay based UMTS system in an urban environment using multiple hops on multiple frequency bands. Measurement based path loss, fading and shadowing models are used in the Manhattan grid deployment scenario. Both uplink and downlink operations of the cellular system are considered at the same time. Two hop communication links over the uplink and downlink are operated at four non-overlapping spectrum bands in order to minimise interference. This results in several possible frequency schemes. Power solutions are derived analytically for the selected frequency schemes. The system performance is evaluated both by simulation and analysis and improvement by employing relays is shown.

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Downlink performance of a CDMA system with distributed base station

Cited by 29 publications

References 4 publications

Downlink performance and capacity of distributed antenna systems in a multicell environment

Downlink performance and capacity of distributed antenna systems in a multicell environment

Uplink scheduling in LTE systems using distributed base stations

Analysing a Multi-hop UMTS over Multiple Frequency Schemes and an Urban Environment

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