Technologies and performance for non-line-of-sight broadband wireless access networks

Gesbert, David; Haumonté, Luc; Bölcskei, Helmut; Krishnamoorthy, R.; Paulraj, A.

doi:10.1109/35.995856

Cited by 37 publications

(15 citation statements)

References 7 publications

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“…Current MIMO examples include the Lucent's BLAST chip and proprietary systems intended for specific markets such as Iospan Wireless' AirBurst system for fixed wireless access [137]. The earliest lab trials of MIMO have been demonstrated by Lucent Technologies several years ago.…”

Section: B Mimo In 3g Wireless Systems and Beyondmentioning

confidence: 99%

From theory to practice: an overview of MIMO space-time coded wireless systems

Gesbert

Shafi²,

Shiu

et al. 2003

IEEE J. Select. Areas Commun.

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1,871

895

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Abstract-This paper presents an overview of recent progress in the area of multiple-input-multiple-output (MIMO) space-time coded wireless systems. After some background on the research leading to the discovery of the enormous potential of MIMO wireless links, we highlight the different classes of techniques and algorithms proposed which attempt to realize the various benefits of MIMO including spatial multiplexing and space-time coding schemes. These algorithms are often derived and analyzed under ideal independent fading conditions. We present the state of the art in channel modeling and measurements, leading to a better understanding of actual MIMO gains. Finally, the paper addresses current questions regarding the integration of MIMO links in practical wireless systems and standards.

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Section: B Mimo In 3g Wireless Systems and Beyondmentioning

confidence: 99%

From theory to practice: an overview of MIMO space-time coded wireless systems

Gesbert

Shafi²,

Shiu

et al. 2003

IEEE J. Select. Areas Commun.

Self Cite

1,871

895

View full text Add to dashboard Cite

show abstract

“…In F-BWA networks with quad-sectored cells and directional sector, terminal antennas, typical values for the cluster size are N = 1, 2 with A = 1, resulting in F R = 1, 2 respectively. For smaller values of F R the system spectral efficiency is improved [1]. An important assumption in the frequency planning methodology is that the available channels are uniformly distributed in all cells according to F R , and furthermore the re-use distribution is independent to the CA scheme (a channel can be assigned in any sector within a cell).…”

Section: N O N -Uniform Channel Assignmentmentioning

confidence: 99%

“…According to (1), to keep the SIR at an acceptable level, either the re-use distance is selected high (i.e. in omni-directional cells), or the interference rejection capability of directional antennas is used to balance a smaller re-use distance, hence a higher frequency re-use factor.…”

Section: Interference Considerations and Frequency Planning In F-bwamentioning

confidence: 99%

“…Emerging F-BWA systems aim at non line-of-sight (NLOS) operation in the 2-11 GHz frequency range (according to IEEE 802. improving radio coverage and allowing wall-mounted or even indoor terminal equipment, [1,2]. Considering the increasing number of broadband users, the bandwidth-consuming services and the limited available spectrum in the lower regions of the 2-11 Ghz band (i.e.…”

Section: Introductionmentioning

confidence: 99%

“…In this sense, to cope with capacity requirements the available spectrum has to be re-used aggressively, an approach that will result in high co-channel interference levels. Interference effects will be quite strong at the base and terminal receivers that use limited directionality antennas (typical 60-90 • beam-width, [1]) to receive enough indirect paths inside the main lobe and be able to reconstruct the signal in the absence of a line-of-sight (LOS) path. Furthermore, severe interference may appear at the base station receiver (in a sector-to-sector direction) when an adaptive -time division duplex (A-TDD) is used for efficient radio resource management in asymmetric and time-varying traffic conditions [3].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Novel Channel and Polarization Assignment Schemes for 2–11 GHz Fixed–Broadband Wireless Access Networks

Ntagkounakis

Sharif

Dallas

2006

Wireless Pers Commun

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The scarcity of available spectrum in the 2-11 GHz frequency range and the continuously increasing number of users that require broadband communication services suggest that emerging fixed-broadband wireless access (F-BWA) networks will be deployed with aggressive frequency re-use to cope with capacity demands. In this context, co-channel interference may arise in high levels compromising the system's capacity and robust operation. Interference is further increased when limited directionality terminal antennas are employed to support non line-of-sight operation and in the case where an adaptive-time division duplex is selected for efficient radio resource management in asymmetric and time-varying traffic conditions. In this paper frequency channel assignment (CA) and antenna polarization assignment (PA) are considered as a means of mitigating interference. Two novel CA schemes that consider the distinct characteristics of F-BWA are proposed; the rotated-interleaved channel assignment and the non-uniform channel assignment. According to statistical interference simulation analysis the proposed schemes are more efficient in suppressing interference, achieving higher capacity compared to existing schemes while incurring no further complexity. In addition, instead of exploiting the performance of CA and PA schemes independently a framework for a joint CA-PA consideration is presented, where for a particular CA scheme an optimized PA pattern is developed. Results show that this approach improves the CA-PA interoperability increasing the overall performance. The efficiency of the proposed schemes is investigated for both FDD and adaptive-TDD schemes and is verified for various sectorization, frequency re-use and terminal antenna directivity configurations to ensure compatibility with different deployment scenarios.

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Adaptive Array Antennas

Sun

Karmakar

2005

Encyclopedia of RF and Microwave Engineering

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Adaptive array antennas play an important role in wireless communications systems. The article begins with a brief introduction to evolution of wireless communications systems. After that, the current and future applications of adaptive array antennas in wireless communications systems are described. The structures and implementations of the adaptive array antennas systems, including switched‐beam antennas, phased‐array antennas, digital beamforming (DBF ) array antennas, parasitic array antennas, and diversity antennas, are described in Section 4. The article concludes with a comparison of different adaptive array antenna architectures.

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Technologies and performance for non-line-of-sight broadband wireless access networks

Cited by 37 publications

References 7 publications

From theory to practice: an overview of MIMO space-time coded wireless systems

From theory to practice: an overview of MIMO space-time coded wireless systems

Novel Channel and Polarization Assignment Schemes for 2–11 GHz Fixed–Broadband Wireless Access Networks

Adaptive Array Antennas

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