New bit loading algorithms for DMT systems based on the greedy approach

Assimakopoulos, Costas; Pavlidou, Fotini‐Niovi

doi:10.1002/wcm.286

Cited by 3 publications

(3 citation statements)

References 16 publications

(33 reference statements)

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“…., and 256-QAM. Additionally, the BERs of BPSK and M-QAM in AWGN channel for a certain SNR can be calculated from the closed-form expression given in [30] and [31].…”

Section: Applying Simple Bit Loading For Dco-ofdmmentioning

confidence: 99%

A New Automotive VLC System Using Optical Communication Image Sensor

Takai²,

et al. 2016

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As a new technology for next-generation vehicle-to-everything (V2X) communication, visible-light communication (VLC) using light-emitting diode (LED) transmitters and camera receivers has been energetically studied. Toward the future in which vehicles are connected anytime and anywhere by optical signals, the cutting-edge camera receiver employing a special CMOS image sensor, i.e., the optical communication image sensor (OCI), has been prototyped, and an optical V2V communication system applying this OCI-based camera receiver has already demonstrated 10-Mb/s optical signal transmission between real vehicles during outside driving. In this paper, to reach a transmission performance of 54 Mb/s, which is standardized as the maximum data rate in IEEE 802.11p for V2X communication, a more advanced OCI-based automotive VLC system is described. By introducing optical orthogonal frequency-division multiplexing (optical-OFDM), the new system achieves a more than fivefold higher data rate. Additionally, the frequency response characteristics and circuit noise of the OCI are closely analyzed and taken into account in the signal design. Furthermore, the forward-current limitation of an actual LED is also considered for long operational reliability, i.e., the LED is not operated in overdrive. Bit-error-rate experiments verify a system performance of 45 Mb/s without bit errors and 55 Mb/s with BER G 10 À5 .Index Terms: Visible light communication (VLC), intelligent transport system (ITS), vehicleto-vehicle (V2V) communication, infrastructure-to-vehicle (I2V) communication, light-emitting diode (LED), image sensor-based VLC, optical communication image sensor (OCI), optical orthogonal frequency division multiplexing (optical-OFDM).

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“…., and 256-QAM. Additionally, the BERs of BPSK and M-QAM in AWGN channel for a certain SNR can be calculated from the closed-form expression given in [30] and [31].…”

Section: Applying Simple Bit Loading For Dco-ofdmmentioning

confidence: 99%

A New Automotive VLC System Using Optical Communication Image Sensor

Takai²,

et al. 2016

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“…The resulted symbol duration is 33.2 µsec and 512 subcarriers are used to transmit data. Each carrier is loaded with bits adaptively in accordance with the channel signal to noise ratio, using a bit loading algorithm [15]. However, flat energy distribution over the subcarriers is used [16].…”

Section: Physical Layermentioning

confidence: 99%

Cross-Layer Designs of Multicarrier NC-PRMA Systems over Powerlines

Papaioannou

Assimakopoulos

Pavlidou

2007

2007 IEEE International Symposium on Power Line Communications and Its Applications

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− We study the performance of Non-Collision Packet Reservation Multiple Access (NC-PRMA) scheme as a MAC protocol for powerline communication networks. A PHY-MAC cross layer design is considered in order to provide Quality of Service (QoS) guarantees for integrated voice, data and video services. System performance is evaluated via simulations in terms of packet dropping probability and mean access delay.

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“…While achieving rate optimality, the family of greedy algorithms is also known to be greedy in terms of computing requirements. Therefore, reduced complexity schemes are either water-filling-based only [ 2 ] or aim at simplifications [ 13 ]. In this paper we propose a novel suboptimal greedy algorithm, whereby the power reallocation is performed in subsets of the subchannels.…”

Section: Introductionmentioning

confidence: 99%

Suboptimal Greedy Power Allocation Schemes for Discrete Bit Loading

Al-Hanafy

Weiss

2013

The Scientific World Journal

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We consider low cost discrete bit loading based on greedy power allocation (GPA) under the constraints of total transmit power budget, target BER, and maximum permissible QAM modulation order. Compared to the standard GPA, which is optimal in terms of maximising the data throughput, three suboptimal schemes are proposed, which perform GPA on subsets of subchannels only. These subsets are created by considering the minimum SNR boundaries of QAM levels for a given target BER. We demonstrate how these schemes can significantly reduce the computational complexity required for power allocation, particularly in the case of a large number of subchannels. Two of the proposed algorithms can achieve near optimal performance including a transfer of residual power between subsets at the expense of a very small extra cost. By simulations, we show that the two near optimal schemes, while greatly reducing complexity, perform best in two separate and distinct SNR regions.

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New bit loading algorithms for DMT systems based on the greedy approach

Cited by 3 publications

References 16 publications

A New Automotive VLC System Using Optical Communication Image Sensor

A New Automotive VLC System Using Optical Communication Image Sensor

Cross-Layer Designs of Multicarrier NC-PRMA Systems over Powerlines

Suboptimal Greedy Power Allocation Schemes for Discrete Bit Loading

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