Proceedings Article10.1109/ICC.2001.936857
A simple multiuser bit loading algorithm for multicarrier WLAN
Ana Garcia Armada
- 11 Jun 2001
- Vol. 4, pp 1168-1171
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TL;DR: A simple algorithm for multiuser bit loading in a multicarrier WLAN is presented, based on carrier sense multiple access (CSMA) and it performs up to 50% better than conventional CSMA.
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Abstract: Multicarrier modulation techniques are finding growing interest for wireless local area networks (WLANs). Standards, such as Hiperlan type 2 and IEEE 802.11a, have adopted OFDM for transmission of high bit rates in these networks. In this paper we present a simple algorithm for multiuser bit loading in a multicarrier WLAN. The algorithm is based on carrier sense multiple access (CSMA) and it performs up to 50% better than conventional CSMA.
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Citations
SNR gap approximation for M-PSK-Based bit loading
TL;DR: In this letter an approximation is derived for M-PSK similar to the SNR gap of M-QAM so that bit loading algorithms can be extended to this type of modulation.
Analysis and compensation of nonlinear power amplifier effects in multi-antenna OFDM systems
Fernando Gregorio
- 19 Nov 2007
TL;DR: This thesis first addresses the performance analysis of multiuser OFDM systems (space division multiple access (SDMA)OFDM) employing nonlinear PAs employing non linear distortion mitigation techniques, and proposes the combination ofMultiuser detection and nonlinear distort mitigation techniques.
An energy-efficient adaptive modulation suitable for wireless sensor networks with SER and throughput constraints
TL;DR: A cross-layer approach is proposed to tackle the problem of minimizing transmission energy in wireless sensor networks by taking into account that every sensor may require a different bit rate and reliability according to its particular application, and using the signal-to-noise ratio gap approximation.
SNR Gap Approximation for M-PSK-Based Bit Loading
Ana Garc ´ ia-Armada
- 01 Jan 2006
TL;DR: In this letter an approximation is derived for M-PSK similar to the SNR gap of M-QAM so that bit loading algorithms can be extended to this type of modulation.
45
Efficient Subcarrier Allocation for Multiple Access in OFDM Systems
Stephan Pfletschinger,Gerhard Münz,Joachim Speidel +2 more
- 01 Jan 2002
TL;DR: The proposed computationally much more efficient subcarrier allocation algorithm for a multiuser OFDM system suited for downlink and uplink transmission is found to offer advantages of various orders of magnitudes.
43
References
Dual QoS loading algorithms for multicarrier systems offering different CBR services
L.M.C. Hoo,J. Tellado,John M. Cioffi +2 more
- 08 Sep 1998
TL;DR: A novel loading algorithm for discrete multitone (DMT) modulation or orthogonal frequency division multiplex (OFDM) systems simultaneously providing two constant bit rate (CBR) services is proposed and the optimal solution is derived.
27
FDMA capacity of the Gaussian multiple access channel with ISI
Wei Yu,John M. Cioffi +1 more
- 18 Jun 2000
TL;DR: A numerical method is proposed for characterizing the achievable rate region for a Gaussian multiple access channel with ISI under the frequency division multiple access restriction and the discrete bin assignment problem is shown to have a convex programming relaxation, making it tractable to numerical algorithms.
26
Gaussian multiaccess channels with ISI: capacity region and multiuser water-filling
TL;DR: It is shown that, as in the traditional memoryless multiaccess channel, frequency-division multiaccess (FDMA) with optimally selected frequency bands for each user achieves the total capacity of the multiuser Gaussian multi access channel with ISI.
Increase in capacity of multiuser OFDM system using dynamic subchannel allocation
Wonjong Rhee,John M. Cioffi +1 more
- 15 May 2000
TL;DR: A multiuser convex optimization problem is derived to find the optimal allocation of subchannels, and a low-complexity adaptive subchannel allocation algorithm is proposed that performs almost as well as the optimal solution.
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