Performance analysis of a mobile system based on combined SDMA/CDMA access technique

Buracchini, Enrico; Muratore, F.; Palestini, V.; Sinibaldi, M.

doi:10.1109/isssta.1996.563802

Cited by 23 publications

(10 citation statements)

References 9 publications

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“…The performance of this joint multiple access system is also vulnerable to the non-uniform traffic. Although the performance of this joint multiple access system has been previously studied in several papers (Liberti & Rappaport, 1994), (Naquib et al, 1994), (Buracchini et al, 1996) and (Ng & Sousa, 1998), none of them considers to evaluate the most realistic of system performance in this joint multiple access. In this chapter, a new approach called dynamic space-code multiple access (DSCMA) system arising from the combination of CDMA and SDMA systems is designed, and its system performances are then investigated.…”

Section: Trends In Telecommunications Technologies 584mentioning

confidence: 99%

Dynamic Space-Code Multiple Access (DSCMA) System: A Double Interference Cancellation Multiple Access Scheme in Wireless Communications System

Ng¹,

Noordin²,

Ali³

et al. 2010

Trends in Telecommunications Technologies

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Section: Trends In Telecommunications Technologies 584mentioning

confidence: 99%

Dynamic Space-Code Multiple Access (DSCMA) System: A Double Interference Cancellation Multiple Access Scheme in Wireless Communications System

Ng¹,

Noordin²,

Ali³

et al. 2010

Trends in Telecommunications Technologies

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“…Thus the number of interferers in CDMA signal environment is at least in the order of tens and it is never realistic to have that many antenna elements in the cell site of a given wireless communication system for nulling these interferers. This means the behaviour of the radiation pattern adaptation system is no longer of the null steering type but instead, [4] an antenna pattern with reduced response toward undesirable interferences is desired. This technique also helps to reduce co-channel interference due to less energy being transmitted in unwanted directions.…”

Section: Null Vs Low Side Lobe Beamformingmentioning

confidence: 99%

Output SNR Improvement in Array Processing Architectures of WCDMA Systems by Low Side Lobe Beamforming

Khanna

Saxena²

2006

Wireless Pers Commun

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In Wideband direct sequence code division multiple access (WCDMA) same frequency spectrum is shared through all cells simultaneously, as opposed to TDMA which is used for most 2 nd generation systems. In a WCDMA system all transmitted signals turn out to be disturbing factors to all other users in the system in the form of interference limiting the system capacity. To suppress the amount of interference, fast and reliable interference controlling algorithms must be employed in next generation systems. In this paper it is shown that antenna arrays with steer able low side lobes can reduce interference in WCDMA can increase the system capacity and output signal to noise ratio of the array processing architecture. The performance metric O/P SNR of an array processing architectures is simulated in an interfering environment to demonstrate the advantage of low side lobe beamforming over adaptive antennas.

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“…The probability that exactly one call will depart from state (0, x + 1) ≈ (x + 1)µdt. 3. The probability that exactly one call will depart from state (1, x) ≈ (x + 1)µdt.…”

Section: Blocking Probability For Two-fold Sdma Modelmentioning

confidence: 99%

Traffic Models and Blocking Probabilities for Two-Fold and Three-Fold SDMA Communication Systems

Huang

Doherty

2005

Wireless Pers Commun

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Spectrum efficiency is a constant challenge in the design of wireless networks. Space-division-multipleaccess (SDMA) is a promising approach to achieve higher spectral efficiency which reuses bandwidth via multiplexing signals based on their spatial signature. Several different studies have shown that SDMA can effectively improve system capacity in a mobile environment. In this paper, we present a new Markov chain traffic model for a duplicate-at-last (DL) approach [IEE Proceedings on Communication 146 (1999) 303] in two-fold and three-fold SDMA systems. Simplified blocking probability formulations for two-fold and three-fold SDMA are also derived. Simulations based on a common method of spatial separation check for channel allocation in SDMA are presented to evaluate the probability of successfully creating two-fold and three-fold SDMA channels. The simulation, as well as analytical, results indicate that the SDMA system can reduce the blocking probability of the calls and result in more traffic loading than a traditional cellular system. The results also show that our simplified approaches not only can reduce the computational complexity, but can also accurate approximate two-fold and three-fold SDMA performance.

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Performance analysis of a mobile system based on combined SDMA/CDMA access technique

Cited by 23 publications

References 9 publications

Dynamic Space-Code Multiple Access (DSCMA) System: A Double Interference Cancellation Multiple Access Scheme in Wireless Communications System

Dynamic Space-Code Multiple Access (DSCMA) System: A Double Interference Cancellation Multiple Access Scheme in Wireless Communications System

Output SNR Improvement in Array Processing Architectures of WCDMA Systems by Low Side Lobe Beamforming

Traffic Models and Blocking Probabilities for Two-Fold and Three-Fold SDMA Communication Systems

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