Antenna gain against interference in CDMA macrodiversity systems

Yanıkömeroğlu, Halim; Sousa, E.S.

doi:10.1109/tcomm.2002.801521

Cited by 5 publications

(5 citation statements)

References 23 publications

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“…It has been shown in [1], [11] that by placing antennas on the order of λ T that a greater diversity gain is achieved as opposed to traditional carrier wavelength spacing. For purposes of comparison, the antenna separations in the genetic algorithm optimization simulation have been normalized with respect to the symbol wavelength.…”

Section: Symbol Wavelengthmentioning

confidence: 99%

Optimum 2-D LOS MIMO Performance Using Omni-directional Antennas Attained through Genetic Algorithms

Haya

Petersen

Colpitts

2008

6th Annual Communication Networks and Services Research Conference (Cnsr 2008)

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mum 2-D LOS MIMO performance using omni-directional antennas attained through genetic algorithms, " Proceedings of the 6th Annual Communications Networks and Services ResearchConference (CNSR 2008), vol. 1, (Halifax, NS, Canada), pp. 331-338, May 5-8, 2008 This material is posted here with permission of the IEEE. Internal or personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution must be obtained from the IEEE by sending a blank email message to pubs-permissions@ieee.org.By choosing to view this document, you agree to all provisions of the copyright laws protecting it. Optimum 2-D LOS MIMO AbstractThe application of genetic algorithm (GA) optimization has been proven to be highly successful in the area of nonlinear optimizations. For a Multiple-Input, Multiple-Output (MIMO) wireless communication system, the optimum performance of the users with respect to the arrangement of antennas is a highly non-linear function which a genetic algorithm seems highly suited to. In this paper, a four-by-four MIMO system model is considered using a simplified 2-D LOS radio channel with additive white noise. Placing the users in a known arrangement, the optimum placement of the four antennas is determined through a genetic algorithm optimization using the average MSE of the four users as the fitness function. Initial results show a tendency towards an arrangement in which at least two antennas seen by the all transmitters are separated by a symbol wavelength. IntroductionRecent work in the area of wireless communications has shown that when antenna placements in a two-by-two MIMO system are on the order of a symbol wavelength rather than the carrier wavelength, significant improvements can be made with respect to performance [1], [2]. This has given rise to the term of Signaling Wavelength Antenna Placement (SWAP) Gain to describe the advantages. The premise of this finding is that when the antennas are spaced a symbol wavelength apart, the likelihood that the channels are correlated is minimal.Much of the MIMO work to date relies heavily on assuming a randomized multipath rich environment to realize the maximum gains from spatial diversity [3]. The fading characteristics are often modeled as Rayleigh distributions. However, in close range indoor situations, the line of sight (LOS) can often dominate the multipath components (modeled as Ricean distributions), minimizing the prospective gains from MIMO techniques. It is therefore necessary to examine MIMO performance in LOS situations. By strategically arranging the antennas in the system to take advantage of the SWAP Gain, an optimal placement exists that will maximize the performance of the MIMO system in a LOS situation.However, determining the optimum placement of the antennas is seen as a highly non-linear problem that depends on the number of antennas in the system, and distribution of the users in the three-dimensional wirel...

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Section: Symbol Wavelengthmentioning

confidence: 99%

Optimum 2-D LOS MIMO Performance Using Omni-directional Antennas Attained through Genetic Algorithms

Haya

Petersen

Colpitts

2008

6th Annual Communication Networks and Services Research Conference (Cnsr 2008)

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“…Analytical and computer simulation results show that an inter-antenna separation comparable to the signalling wavelength improves the invertibility of the baseband channel matrix more than a separation comparable to the carrier wavelength. A similar concept of the signaling wavelength has been reported in [5].…”

Section: Introductionmentioning

confidence: 53%

Signalling Wavelength in an Antenna Array for Space-Time Wireless over LOS Channels

Zhu

Petersen

Colpitts

3rd Annual Communication Networks and Services Research Conference (CNSR'05)

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This material is posted here with permission of the IEEE. Internal or personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution must be obtained from the IEEE by sending a blank email message to pubs-permissions@ieee.org.By choosing to view this document, you agree to all provisions of the copyright laws protecting it. Signalling Wavelength in an Antenna

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“…Early works on the integration of DASs in cellular networks appeared in [11]- [14], and these were primarily focussed on code division multiple access (CDMA) based systems. In addition to incorporating this architecture into cellular networks, it was shown in these works that dispersing the antennas of the BS over the geographic area of the cell results in increased capacity as well as reduced transmit power levels.…”

Section: Publicationsmentioning

confidence: 99%

“…A comparison between the largest minimum SINR achieved by port selection with exhaustive search and with the technique proposed in the first stage, and that achieved by the one-port (without coordination) and all-port strategies for a two-cell cluster in the SMa scenario. cluster (i.e., M = 2) is considered, which requires searching over 214 « 1.64 x 10 4 port state vectors. The resulting SINRs are averaged over 500 independent channel realizations.…”

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confidence: 99%

Coordinated multi-point transmission for interference mitigation in cellular distributed antenna systems

Ahmad¹

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Antenna gain against interference in CDMA macrodiversity systems

Cited by 5 publications

References 23 publications

Optimum 2-D LOS MIMO Performance Using Omni-directional Antennas Attained through Genetic Algorithms

Optimum 2-D LOS MIMO Performance Using Omni-directional Antennas Attained through Genetic Algorithms

Signalling Wavelength in an Antenna Array for Space-Time Wireless over LOS Channels

Coordinated multi-point transmission for interference mitigation in cellular distributed antenna systems

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