Adaptive Feedback Communications

Hayes, Jeremiah F.

doi:10.1109/tcom.1968.1089811

Cited by 232 publications

(132 citation statements)

References 8 publications

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“…Moreover, the proposed technology can be viewed as an enabling technology, which significantly increases the coverage radius of a given eNodeB with guaranteed PSNR. , and j n is as per (6). In our simulation setup this takes the value 7368.…”

Section: Simulation Resultsmentioning

confidence: 99%

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Adaptive Modulation and Coding based error resilience for transmission of compressed video

Perera

Fernando

Arachchi

et al. 2015

2015 International Wireless Communications and Mobile Computing Conference (IWCMC)

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Abstract-High spectral efficiency is at the core of any effort made to achieve the data rates and capacity requirements demanded by next generation mobile technologies. Adaptive Modulation and Coding (AMC) is considered a powerful tool for the efficient usage of spectrum and for the provision of channel adaptive error resilience. In this paper, a novel AMC based transmission scheme is introduced for Long Term EvolutionAdvanced (LTE-A) networks to impose adaptive error resilience on High Efficiency Video Coding (HEVC) based video data at the physical layer. A model is proposed to rank REs at the LTE-A transmitter based on channel information. Data are allocated onto ranked REs to maximise the efficiency of the users' allocated bandwidth while maintaining video quality. This is achieved by imposing a stronger Modulation and Coding Scheme (MCS) for data that have a high probability of being distorted, thus spanning the entire allocated bandwidth. Simulation results show that the proposed Unequal Error Protection (UEP) strategy helps to minimise the LTE-A transmitter power by up to 8dB with guaranteed video quality. In effect, this is a reduction of approximately 84% of the transmit power.

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Section: Simulation Resultsmentioning

confidence: 99%

“…Another popular form of imposing UEP is the use of AMC [6], a promising technique to overcome dynamic fading in wireless communication. In [7] Low-Density Parity-Check codes and rotated constellations are used to protect important bits in a video compressed using multiple description coding.…”

Section: Introductionmentioning

confidence: 99%

Adaptive Modulation and Coding based error resilience for transmission of compressed video

Perera

Fernando

Arachchi

et al. 2015

2015 International Wireless Communications and Mobile Computing Conference (IWCMC)

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“…Proposed techniques for adaptive modulation maintain this constant distance through adaptive variation of the transmitted power level [9], symbol time [10], constellation size [4], [5], or any combination of these parameters [2], [3], [6]. The modulation segment of Fig.…”

Section: Coset Codes With Adaptive Modulationmentioning

confidence: 99%

Adaptive coded modulation for fading channels

Goldsmith

Chua²

1998

IEEE Trans. Commun.

746

331

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Abstract-We apply coset codes to adaptive modulation in fading channels. Adaptive modulation is a powerful technique to improve the energy efficiency and increase the data rate over a fading channel. Coset codes are a natural choice to use with adaptive modulation since the channel coding and modulation designs are separable. Therefore, trellis and lattice codes designed for additive white Gaussian noise (AWGN) channels can be superimposed on adaptive modulation for fading channels, with the same approximate coding gains. We first describe the methodology for combining coset codes with a general class of adaptive modulation techniques. We then apply this methodology to a spectrally efficient adaptive M-ary quadrature amplitude modulation (MQAM) to obtain trellis-coded adaptive MQAM. We present analytical and simulation results for this design which show an effective coding gain of 3 dB relative to uncoded adaptive MQAM for a simple four-state trellis code, and an effective 3.6-dB coding gain for an eight-state trellis code. More complex trellis codes are shown to achieve higher gains. We also compare the performance of trellis-coded adaptive MQAM to that of coded modulation with built-in time diversity and fixed-rate modulation. The adaptive method exhibits a power savings of up to 20 dB.

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“…However, they are required to be designed with a fixed link margin, which results in inefficient utilization of the channel and eventually becomes a bottle neck to realize a high performance physical layer, as envisioned for 4G systems. Whereas, if CSI is known at transmitting end, link adaptation has been shown [2,3] to improve the spectral efficiency or alternatively minimize the system transmit power by efficiently utilizing the variability of fading channels. The link adaptation schemes adaptively changes the transmission parameters (such as transmission power, symbol rate, constellation size, coding rate and/or coding scheme and any combination of them) in response to time-varying link conditions.…”

Section: Introductionmentioning

confidence: 99%

Joint Rate and Power Adaptation for MC-CDMA over Tempo-Spectral Domain

Hamid

Hoshyar

Tafazolli

2008

2008 IEEE Wireless Communications and Networking Conference

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Abstract-This paper studies the area of link adaptation for multicarrier code division multiple access (MC-CDMA) radio interface and adapts the rate and transmission power jointly over temporal as well as spectral domains. On one side, frequency domain spreading lends a high degree of frequency diversity to MC-CDMA. On the other, it has been identified as the main hurdle when it comes to spectral domain rate allocation in MC-CDMA. This paper presents band based MC-CDMA (BB-MC-CDMA) architecture as an efficient scheme to practically realize the spectral domain rate allocation in MC-CDMA, without undergoing the drawbacks of other published techniques for this purpose. BB-MC-CDMA asks for the elimination of frequency interleaving, usually considered to be an essential ingredient of MC-CDMA. It also suggests an intelligent reduction in the spreading factor in a channel aware fashion. Furthermore, based on BB-MC-CDMA architecture, joint rate and power adaptation over time and frequency (JRPATF) has been shown to outperform the frequency domain power allocation only.

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Adaptive Feedback Communications

Cited by 232 publications

References 8 publications

Adaptive Modulation and Coding based error resilience for transmission of compressed video

Adaptive Modulation and Coding based error resilience for transmission of compressed video

Adaptive coded modulation for fading channels

Joint Rate and Power Adaptation for MC-CDMA over Tempo-Spectral Domain

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