Dynamic slot allocation (DSA) in indoor SDMA/TDMA using a smart antenna basestation

Shad, F.; Todd, T.D.; Kezys, V.; Litva, J.

doi:10.1109/90.909025

Cited by 106 publications

(52 citation statements)

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“…We finally note that STDMA with smart antennas for indoor environments has been well studied. However, unlike previous models [16], [1], [12], [11], [10] that rely on multipath and RAKE receivers, in our case we only use the LOS path and null the NLOS paths. Therefore, the channel allocation problem is very different as we show in the remainder of this paper.…”

Section: Related Workmentioning

confidence: 99%

Empirical capacity of mmWave WLANS

Yiu

Singh

2009

IEEE J. Select. Areas Commun.

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Abstract-The 60GHz spectrum gives us the opportunity to deliver gigabit rates to users in a WLAN (Wireless Local Area Network) setting. The constrained propagation of signals at this frequency band ensures limited coverage which in turn enables the construction of very efficient STDMA (Spatial Time Division Multiple Access) schedules. In this paper we study the achievable aggregate capacity in a room when using two types of smart antenna arrays -linear and circular. Using detailed Matlab simulations, we show that with just 400MHz of the spectrum, aggregate data rates of 9Gbps (4.5Gbps) can be achieved with linear (circular) arrays. We also study the energy efficiency of the communication and show that the energy/bit is as low as 0.2 × 10 −10 (0.2 × 10 −9 ) Joules/Bit by using variable transmit powers at different parts of the room. Finally, we study the problem of coverage due to blocking of the LOS (Line Of Sight) path. To mitigate this problem we study the use of static reflectors and show that coverage in the entire room can indeed be maintained.

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Section: Related Workmentioning

confidence: 99%

Empirical capacity of mmWave WLANS

Yiu

Singh

2009

IEEE J. Select. Areas Commun.

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“…Since the MIMO techniques allow more users to be served at the same time in the same frequency, they are emerging as a novel approach for spectrally efficient terrestrial HIPERMAN systems. In the recent years, the focus of MIMO-OFDM research in HIPERMAN was on STC and beamforming [3], and some of them have been standardised [4]. Since MUD allows the parallel operation of multiple radio links and has very good performance in NLOS environment, using MUD in OFDM-based HIPERMAN system to improve the system capacity is emerging as a new research area.…”

Section: Introductionmentioning

confidence: 99%

New MAC design to accommodate joint detection techniques in a MIMO-OFDM-based HIPERMAN system

Fan

Hoshyar

Fazel

et al. 2004

The 13th IEEE Workshop on Local and Metropolitan Area Networks, 2004. LANMAN 2004.

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One of the key research issues in wireless systems is how to improve the system capacity. MIMO has been proven as an effective method to achieve this. Previously, the focus of MIMO-OFDM research in High Performance Metropolitan Area Network (HIPERMAN) systems was on Space Time Coding (STC) and beamforming. Recently, Multi-User Detection (MUD) has emerged as a novel approach in MIMO-OFDM-based HIPERMAN systems. In this paper, we have proposed a new MAC design, which includes the new and flexible MAC frame structure and an efficient dynamic resource allocation algorithm, in order to accommodate the MUD techniques in uplink transmission in HIPERMAN systems. The performance of the new MAC design has been evaluated via simulation means. The simulation results show that the new MAC design based on MUD can significantly increase the system capacity.' Introduction A H3PERMAN system, which uses IEEE 802.16 as a prototype, is a Broadband Fixed Wireless Access (BFWA)

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“…the complexity increases exponentially with the number of variables. It is shown in [2] by graph theory that the problem of minimizing the length of an SDMA/TDMA frame, while ensuring a minimum SINR for each terminal, is NP-complete. In our case, the proof follows directly from linear programming, in which several combinatorial problems are known to be NP-complete, among others the Knapsack.…”

Section: A Towards a Simple Tool To The User Clusteringmentioning

confidence: 99%

“…[2] for an example of the uplink of an SDMA/TDMA system. In [3] the authors extend [2] to take into account several QoS parameters. In this paper, we justify and propose a greedy algorithm based on the normalized scalar product to allocate the users into groups.…”

Section: Introductionmentioning

confidence: 99%

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Practical bit loading schemes for multi-antenna multi-user wireless OFDM systems

Bartolome¹,

Pérez-Neira

Ibars³

Conference Record of the Thirty-Eighth Asilomar Conference on Signals, Systems and Computers, 2004.

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Abstract-This paper deals with practical multi-antenna multiuser OFDM systems. With the additional degrees of freedom of multiple antennas and multiple subcarriers, the performance might be enhanced, but the scheduling complexity might increase exponentially. Since the scheduling with realistic integer signal mappings is an NP-complete combinatorial problem, suboptimum solutions based on the scalar product are good candidates to yield a fast and realizable practical implementation. We propose afterwards a power reuse strategy to lowerthe computational complexity, and show that the amount of signaling can be reduced by forcing an equal mapping for all the users at the same subcarrier.

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Dynamic slot allocation (DSA) in indoor SDMA/TDMA using a smart antenna basestation

Cited by 106 publications

References 10 publications

Empirical capacity of mmWave WLANS

Empirical capacity of mmWave WLANS

New MAC design to accommodate joint detection techniques in a MIMO-OFDM-based HIPERMAN system

Practical bit loading schemes for multi-antenna multi-user wireless OFDM systems

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