An efficient bit allocation algorithm for multicarrier modulation

Wyglinski, Alexander M.; Labeau, Fabrice; Kabal, P.

doi:10.1109/wcnc.2004.1311358

Cited by 22 publications

(35 citation statements)

References 10 publications

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“…where 0 < n T (s) ≤ L T and 0 < n R (s) ≤ L R are the number of active transmit and receive antennas for array configuration s, and µ T & µ R , where µ T + µ R = 1, are weights 5 . The difference between the two proposed algorithms is how the bit allocation is performed.…”

Section: If Bothpmentioning

confidence: 99%

“…To increase throughput, multicarrier systems can tailor the subcarrier signal constellation sizes according to the channel environment via a technique called bit allocation [5]. Both Thoen et al [6] and Bartolome, Perez-Neira, & Ibars [7] examined the performance benefits of bit allocation employed in multicarrier systems employing multiple antennas.…”

Section: Introductionmentioning

confidence: 99%

“…The bit allocation is based on the authors' previous algorithm for single-input/single-output (SISO) multicarrier systems, which quickly provides solutions that are close to the optimal allocation [5].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Loading Algorithm for Multicarrier Spatial Diversity Systems with Antenna Selection

Wyglinski

Labeau²,

Kabal³

2007

IEEE Trans. Wireless Commun.

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-This paper presents two novel loading algorithms for multicarrier systems performing spatial diversity. The algorithms use bit allocation techniques to increase throughput while ensuring the system remains below a specified error rate. One algorithm uses the same signal constellation across all subcarriers while the other varies the signal constellations. To reduce hardware costs, power consumption, and complexity, the proposed algorithms simultaneously perform antenna subset selection, choosing array configurations that yield further increases in the overall throughput. Our results show that the combination of multiple antennas and bit allocation by the proposed algorithms substantially increases throughput. Furthermore, hardware costs are reduced with a negligible penalty in throughput when antenna subset selection is employed.

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Section: If Bothpmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Loading Algorithm for Multicarrier Spatial Diversity Systems with Antenna Selection

Wyglinski

Labeau²,

Kabal³

2007

IEEE Trans. Wireless Commun.

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“…Recent research in this area has either focused on adaptive antenna systems such as pattern reconfigurable antennas [1][2][3][4][5][6][7][8] or adaptive physical layer (PHY) techniques such as link adaptation [9][10][11][12][13] to enhance data rates.…”

Section: Introductionmentioning

confidence: 99%

Reconfigurable antennas and link adaptation algorithms for MIMO-OFDM wireless systems

Sworo

Dandekar

Kam

2015

J Wireless Com Network

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In this work, we study and analyze the performance of physical layer algorithms for adaptive multiple input-multiple output orthogonal frequency-division multiplexing (MIMO-OFDM) wireless systems that employ a new class of adaptive antenna systems known as reconfigurable antennas. These antennas are capable of adaptively modifying their radiation characteristics and thus leverage pattern diversity to affect how the transmitter and receiver perceive the wireless channel. We propose a low complexity spatial adaptive modulation and coding (AMC) algorithm that uses the advantages of pattern reconfigurable antennas in concert with link adaptation to improve MIMO-OFDM link throughput. The algorithm operates in two main stages; first, it searches for the antenna configuration that yields the highest post processing signal-to-noise ratio (ppSNR) and, then, applies AMC to improve spectral efficiency. The performance of the proposed scheme is experimentally evaluated for a 2 × 2 MIMO-OFDM wireless system in an indoor environment.

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“…En [Wyg04], se propone un algoritmo de asignación incremental del número de símbolos para la asignación óptima de bits, condicionada a la restricción de BEP media. Una solución se muestra en el diagrama de flujo en la Fig.…”

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Modelado en frecuencia del canal UWB y su aplicación en el análisis de técnicas de modulación adaptativa en sistemas MB-OFDM UWB para redes WPAN

Ramírez¹

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Modelado en frecuencia del canal UWB y su aplicación en el análisis de técnicas de modulación adaptativa en sistemas MB-OFDM UWB para redes WPAN ABSTRACTThe current trend to integrate the different services and applications on a single network infrastructure has generated a growing deployment of wireless wide area network (WWAN), local area network (WLAN) and personal area network (WPAN) with differentiated traffic requirements (QoS), security and high bit rate transmission, requires the development of protocols and new transmission techniques that allow better integration of applications and communications services in a environment hostile, as the mobile wireless channel with multipath propagation.One of the greatest challenges for carrying out this integration is to achieve a communication link with certain quality and high transmission capacity.The combination of adaptive modulation and coding techniques in conjunction with multicarrier transmission such as OFDM (Orthogonal Frequency Division Multiplexing) and other advanced technologies such as MIMO-UWB (transmission and reception with multiple antennas in ultra wideband systems) represents a powerful tool to improve the performance and allow compliance with the goals and challenges defined by these networks.This thesis deals with the improvement the quality and capacity of transmission in a WPAN networks, using the standard MB-OFDM (OFDM over multiple bands) in UWB channels with adaptive modulation performing a discrete rate adaptation of bits transmitted per sub-carrier.The basic principle of a modulation scheme and/or adaptive coding is to obtain information on the characteristics, structure and variability of the wireless mobile channel. With the information obtained from the receiver the transmitter adapts the symbol transmission rate, constellation size, coding rate or any combination of these parameters based on the channel state information. This Ph.D dissertation begins with an analysis in time and frequency domain of the two UWB channel proposed models by the IEEE 802.15.3a and IEEE 802.15.4a working groups. The objective is to determine the statistical distribution that best approximates the amplitude of each sub-carriers in frequency domain, and later to define the metric to use in the assessing the UWB channel state and dynamics. v The adaptive modulation requires the transmitter to adapt to the variability of the channel. The analysis can be done in two ways• Assuming perfect adaptation (ideal estimation) which implies that the transmitter always knows the dynamics and structure of the channel.• Assuming an error (imperfect channel estimation) in the adaptation due to uncertainty in the knowledge of the channel.The estimation method of the UWB channel used in this thesis is based on the knowledge of the power correlation coefficient between data sub-carriers and pilot sub-carrier, given that the position of each in the spectrum is well defined according to the MB-OFDM standard. We propose a closed-form expression to calculate the correla...

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An efficient bit allocation algorithm for multicarrier modulation

Abstract: Abstract

Cited by 22 publications

References 10 publications

Loading Algorithm for Multicarrier Spatial Diversity Systems with Antenna Selection

Loading Algorithm for Multicarrier Spatial Diversity Systems with Antenna Selection

Reconfigurable antennas and link adaptation algorithms for MIMO-OFDM wireless systems

Modelado en frecuencia del canal UWB y su aplicación en el análisis de técnicas de modulación adaptativa en sistemas MB-OFDM UWB para redes WPAN

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