Impact of amplifier nonlinearities on OFDM transmission system performance

Costa, E.; Midrio, M.; Pupolin, S.

doi:10.1109/4234.749355

Cited by 247 publications

(129 citation statements)

References 4 publications

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“…These problems can be solve by increasing the number of transmitter antenna and receiver antenna but it takes more cost. With the intention of solving the above problem with cost efficiency, we plan to incorporate the OSTBC, ZCT With the intention of reducing the PAPR in OFDM, the subcarriers signals are added through inverse fast Fourier transform (IFFT) operation which helps to increase the performance of high-power amplifier (HPA) at the transmitter [5,6] [7]. There are many techniques used to reduce the PAPR of MIMO-OFDM system that are Clipping and filtering [8], Partial transient sequence (PTS) [9], Selected mapping(SLM) [10], Zadoff-Chu transform (ZCT) [11].…”

Section: Introductionmentioning

confidence: 99%

Channel Estimation Using EKF - ZCT Based Orthogonal STBC MIMO OFDM System

2017

International Journal of Research Studies in Computer Science a

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Multiple-input multiple-output orthogonal frequency division multiplexing (MIMO-OFDM)transmission can improve both the transmission capacity and performance due to diversity gain. However, one of the major drawback of MIMO-OFDM have high peak-to average power ratio (PAPR) in order to the signals transmitted on different antennas. The transmitted bits must be channel-encoded as they are particularly critical to the performance of the considered OFDM system. Consequently, this channel encoding highly increases the system complexity and decreases the transmission data rate. These two problems are subjected to transmitter diversity that can overcome by incorporating orthogonal space-time block coded (OSTBC) and Zadoff-Chu Transform (ZCT) with the MIMO-OFDM. Moreover, the receiver diversity is can be improved using of Extended Kalman Filter (EKF). By enhancing the transmitter diversity and receiver diversity

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Section: Introductionmentioning

confidence: 99%

Channel Estimation Using EKF - ZCT Based Orthogonal STBC MIMO OFDM System

2017

International Journal of Research Studies in Computer Science a

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“…Figure 5d shows the bit error rate (BER) versus signal to noise ratio (SNR) of GO-MC-CDMA system using different detectors. The three stages PIC detector gives a better BER performance, while SIC detector is reducing the error rate at SNR values (7)(8)(9)(10)(11) …”

Section: Space Diversity Technique Andmentioning

confidence: 99%

Fading Channel with Orthogonal Multi-carrier Code Division Multiple Access Signal

Trrad¹,

Hindi²,

Sobih³

2012

IJNC

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The wireless industry is currently undergoing a major transition from second generation (2G) to third generation (3G) wireless technologies, and the increasing demands for communication services require higher transmission rates that further stimulates the demand on wideband technologies depicted in the form of code division multiple access (CDMA) on one hand. Also, as the privacy is a prime issue in modern communications therefore the carriers orthogonality is a fundamental concept for a sustainable development of the communications sector. This paper attempts to assess wireless communications channels and propose techniques to improve the performance of modern wireless communications. Hence from a strategic perspective, an analytical study into the performance of Group Orthogonal Multi Carrier Code Division Multiple Access (GO-MC-CDMA) in which subcarriers assigned to users which are orthogonal to other groups, the channel bandwidth is the main theme of this paper; from which the problems that may affect the communications link are high lighted and measures to counterbalance and alleviate multipath fading are proposed and investigated. Such measures are: Space diversity combining techniques and minimum -mean square error, and interference cancellation and detection are considered in this research. As a result of this research it can be stipulated that subcarriers grouping does reduce Multi-User-Interference (MUI) between frequency groups thus enhance the performance of MC-CDMA system in the mission of meeting newly emerging wideband communications services, such as video conference and others.

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“…On the other hand using low back-off leads to signal distortion which results performance degradation. When spread spectrum techniques are used with OFDM, the nonlinear amplification of the signal destroys the properties of spreading sequences (Costa et al, 1999;Ochiai and Imai, 2002) The simplest methods to reduce high Peak to Average Power Ratio (PAPR) of Multicarrier signals are signal cilpping and filtering before signal transmission. The effects of cilpping and filtering has been considered in (Li and Cimini, 1998).…”

Section: Introductionmentioning

confidence: 99%

Performance Analysis of Global Search Algorithm Based Multiuser Detector for Multi Carrier Code Division Multiple Access System under Clipping Noise

Sivanesskumar¹

2011

Journal of Computer Science

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Problem statement: Multi Carrier Code Division Multiple Access (MC-CDMA), a promising technology for the 4G communication systems. The major limitation of MC-CDMA system is the Multiple Access Interference (MAI) which is due to near-far effect, frequency offset and nonlinear power amplification due to clipping noise. Approach: The performance of MC-CDMA under clipping noise using Global search algorithm based Multiuser detector in AWGN, Rayleigh and Rician channel is analyzed in this study. Results: The proposed method is simulated using BPSK modulation, Walsh spreading code, number of subcarriers 64 and number of users 16 and clipping noise. Conclusion: By simulation result, BER in AWGN channel outperforms other channels as SNR is increased. The performance of Rician fading channel is better than that of Rayleigh fading channel, because of the LOS path.

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Impact of amplifier nonlinearities on OFDM transmission system performance

Cited by 247 publications

References 4 publications

Channel Estimation Using EKF - ZCT Based Orthogonal STBC MIMO OFDM System

Channel Estimation Using EKF - ZCT Based Orthogonal STBC MIMO OFDM System

Fading Channel with Orthogonal Multi-carrier Code Division Multiple Access Signal

Performance Analysis of Global Search Algorithm Based Multiuser Detector for Multi Carrier Code Division Multiple Access System under Clipping Noise

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