Proceedings Article10.1109/GLOCOM.2005.1578268
Efficient adaptive loading algorithm with simplified bandwidth optimization method for OFDM systems
Kaiming Liu,Feifei Yin,Wenbo Wang,Yuanan Liu +3 more
- 01 Jan 2005
- Vol. 5, pp 5
9
TL;DR: A simplified bandwidth optimization method is proposed to search for all usable subchannels for loading algorithms which aim at the minimization of power consumption with constraint of constant data rate and target bit error rate (BER).
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Abstract: A crucial aspect for adaptive bit and power loading algorithms is to determine all usable subchannels. In this paper, a simplified bandwidth optimization method is proposed to search for all usable subchannels for loading algorithms which aim at the minimization of power consumption with constraint of constant data rate and target bit error rate (BER). Based on this method, an efficient loading algorithm is developed. Simulation results show that the proposed algorithm can achieve the same bit allocation results to that of the well-known Hughes-Hartogs and Fischer et al. algorithm. This algorithm is appropriate for OFDM systems in time-varying channels due to its low complexity
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Citations
Power Loading in Parallel Diversity Channels Based on Statistical Channel Information
Justin P. Coon,Rafael Cepeda +1 more
TL;DR: It is shown that there exists an arbitrary number of power allocation schemes that achieve capacity in systems operating in parallel channels comprised of single-input multiple-output (SIMO) Nakagami-m fading subchannels when the number of degrees of freedom L tends to infinity, and it is proved that statistical waterfilling is one such scheme.
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Optimal and efficient bit loading for OFDM in the presence of channel uncertainty
Chunhui Liu,Rudolf Mathar +1 more
- 30 Dec 2008
TL;DR: This paper considers optimal bit loading for orthogonal frequency division multiplexing (OFDM) with imperfect CSI subject to channel estimation with frame length as an important control parameter, while soft channel estimation and the Cramer-Rao bound are used to include the effect of channel estimation.
Multi-User MIMO-OFDM with Adaptive Resource Allocation over Frequency Selective Fading Channel
Yongbo Tan,Qing Chang +1 more
- 18 Nov 2008
TL;DR: The scheme proposed here attempts to make the MIMO-OFDM systems more flexible and robust to channel variations and provides a low complexity algorithm based on the greedy algorithm for the adaptive bit and power allocation over the frequency selective fading channel.
4
Adaptive power loading with BER-constraint for OFDM systems
TL;DR: Simulation results indicate the superiority of the proposed algorithm in terms of BER performance and algorithmic complexity, while guaranteeing the target overall BER.
2
A novel fast algorithm proposed based on Leke’s algorithm
Mingjuan Huang,Laibo Zheng,Xinfeng Zhao,Jintang Wang +3 more
- 13 Mar 2013
TL;DR: Simulation results show that the improved algorithm proposed based on the new method also can achieve the optimal solution to that of the well-known optimal algorithm - Greedy algorithm with lower computational complexity.
2
References
Patent
Ensemble modem structure for imperfect transmission media
Dirk Hughes-Hartogs
- 05 May 1986
TL;DR: In this paper, a high speed modem that transmits and receives digital data on an ensemble of carrier frequencies spanning the usable band of a dial-up telephone line is described, which includes a system for variably allocating data and power among the carriers to compensate for equivalent noise and to maximize the data rate.
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Computationally efficient optimal power allocation algorithms for multicarrier communication systems
TL;DR: This work presents an optimal, computationally efficient, integer-bit power allocation algorithm for discrete multitone modulation using efficient lookup table searches and a Lagrange-multiplier bisection search that can replace the use of suboptimal methods.
476
Beyond 3G: wideband wireless data access based on OFDM and dynamic packet assignment
TL;DR: In this article, the authors discuss packet data transmission rates of 2-5 Mbps in macrocellular environments and up to 10 Mbps in microcellular and indoor environments as a complementary service to evolving second-and third-generation wireless systems.
370
Transmit power and bit allocations for OFDM systems in a fading channel
Ji-Ho Jang,Kwang Bok Lee,Yong-Hwan Lee +2 more
- 01 Dec 2003
TL;DR: The proposed algorithm, based on the water-filling approach, is appropriate for OFDM systems in a time varying wireless channel for its low computational complexity and good performance.
Bandwidth optimization for high speed data transmission over channels with severe intersymbol interference
P.S. Chow,John M. Cioffi +1 more
- 06 Dec 1992
TL;DR: Algorithms are presented for finding the optimal transmission bandwidth in terms of either maximizing the overall data throughput or maximizing the system performance margin, given a fixed target data rate, for high speed data transmission over channels with severe intersymbol interference.
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