Analysis of OFDM multiuser system over fading channels

Simic, J.R.

doi:10.1109/telsks.2001.955886

Cited by 4 publications

(5 citation statements)

References 2 publications

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“…An OFDM-modulated signal consists of the parallel transmission of several signals that are modulated at different carrier frequencies evenly spaced by Δ [1][2][3][4][5][6][7]. The complex valued input symbol sequence { ( )} is split into subsequences { ( )} with ( ) = ( ), = + , = 0, 1, .…”

Section: Ofdm Systemmentioning

confidence: 99%

“…The complex baseband OFDM signal ( ) is inputted into the guard band insert block for extending the OFDM signal duration by the guard interval by a periodic extension of the signal ( ). The OFDM baseband signal with a guard interval denoted by ( ) is inputted to a band limiting filter that may be, for example, a square root raised cosine filter and may include a digital to analog converter providing the filtered complex baseband OFDM signal ( ) that modulates a carrier signal providing the bandpass OFDM signal V( ) given by (2). This paper is focused upon the subsystem of the OFDM system that generates the complex baseband OFDM signal ( ) from the input data ( ).…”

Section: Ofdm Systemmentioning

confidence: 99%

“…, − 1. The phase is selected in a random manner with a uniform probability density function over the interval [0,2 ]. The set of vectors thus formed is made known to the receiver in advance.…”

Section: Techniques For the Reduction Of The Peak To Average Power Ratiomentioning

confidence: 99%

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Transform Methods for the Reduction of the Peak to Average Power Ratio for the OFDM Signal

Kumar

Santitewagul

2017

Wireless Communications and Mobile Computing

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The paper presents multitransform OFDM-OP system for an effective PAPR (peak to average power ratio) reduction that has a reasonable computational requirement, does not introduce any distortion, needs relatively insignificant decrease in the bandwidth efficiency, and provides a PAPR very close to that for the single carrier modulation systems thus effectively eliminating any PAPR penalty incurred by the multicarrier OFDM system. The PAPR system consists of a bank of multiple orthonormal transforms and a minimum PAPR evaluation unit for finding the optimum transform index. The paper also presents a hybrid OFDM-OP-DSI system comprised of the multiple transforms and a novel dummy symbol insertion. The PAPR reduction performance of the presented systems is compared with those of the various other transform techniques of the literature. Various simulations on the presented systems show that these can achieve a PAPR that is very close to that of a single carrier system for QAM modulation with the order of modulation selected to be 16, 64, and 256.

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Section: Ofdm Systemmentioning

confidence: 99%

Section: Ofdm Systemmentioning

confidence: 99%

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Transform Methods for the Reduction of the Peak to Average Power Ratio for the OFDM Signal

Kumar

Santitewagul

2017

Wireless Communications and Mobile Computing

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“…The subchannel allocation method given in [9] integrated frequency-division multi-access (FDMA) and timedivision multi-access (TDMA). This means that users share subchannels in both time and frequency domains.…”

Section: Subchannel Assignmentmentioning

confidence: 99%

“…This would cause a considerable amount of delay for the particular mobile terminal. The minimum transmission rate of each mobile terminal was not guaranteed in [9] and [10]. To overcome this difficulty, we propose a subchannel allocation method below to support the minimum transmission rate of each mobile terminal.…”

Section: Subchannel Assignmentmentioning

confidence: 99%

Power control, dynamic subchannel allocation, and adaptive modulation for multiuser OFDM systems

Chang

Kuo

2003

SPIE Proceedings

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A new scheme to control the transmission power, allocate subcarriers, and choose modulation schemes for each mobile terminal in a multiuser OFDM system is proposed in this paper. This scheme will make OFDM systems more flexible and more robust to the channel variation along time. We divide the problem into two stages. In the first stage, we maximize the minimum signal-to-noise ratio (SNR) of subchannels subject two constraints. The total system performance can be maintained to an acceptable level in this stage. In the second stage, based on the result of the first stage, we choose the modulation schemes of subchannels of each mobile terminal in the hope that the total transmission rate can be maximized and the performance requirement of each mobile terminal can be satisfied. Simulations are conducted under a different total number of mobile terminals and a different SER (symbol error rate) requirements. Simulation results show that the proposed scheme works well under the simulated environments.

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Mitigation of Multipath Effects in Broadband Wireless Systems using Quantized State Adaptive Equalization Methods

Kumar

Khan

2006 IEEE Aerospace Conference

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Analysis of OFDM multiuser system over fading channels

Cited by 4 publications

References 2 publications

Transform Methods for the Reduction of the Peak to Average Power Ratio for the OFDM Signal

Transform Methods for the Reduction of the Peak to Average Power Ratio for the OFDM Signal

Power control, dynamic subchannel allocation, and adaptive modulation for multiuser OFDM systems

Mitigation of Multipath Effects in Broadband Wireless Systems using Quantized State Adaptive Equalization Methods

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