Quantized precoding and companding schemes for PAPR reduction in UFMC‐based massive MIMO downlink systems

Durga, ChintalaVijaya; SundruAnuradha,

doi:10.1002/ett.4344

Cited by 3 publications

(2 citation statements)

References 32 publications

(18 reference statements)

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“…The OFDM provides high side-lobes that cause out-of-band (OOB) radiation, demand strict synchronization and higher PAPR. New multi-carrier design waveforms are important to overcome the OFDM system [2]. Many PAPR reduction techniques, such as post-coding, pre-coding, PTS, SLM, filtering, and clipping, were applied in the MIMO-OFDM system [3].…”

Section: Introductionmentioning

confidence: 99%

Enhanced Artificial Bee Colony, Square Root Raised Cosine Precoding, and Mu law Compandor for Optimization of MIMO-OFDM System

Azeez¹,

Tarannum²

2023

Int. J. Adv. Sci. Eng. Inf. Technol.

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The efficiency and high-speed data transfer rate of the communication system are increased based on Orthogonal Frequency Division Multiplexing (OFDM). The existing research in OFDM involves applying optimization methods to improve the system's efficiency. The high Peak Average Power Ratio (PAPR) value is a major limitation in the OFDM system, and this provides distortion due to the non-linear High-Power Amplifier (HPA). Local optima trap and lower convergence are two main limitations in existing optimization methods. This research proposes Enhanced Artificial Bee Colony (ABC) optimization method with a precoding-compandor technique to increase the efficiency of the OFDM system. Enhanced ABC method is applied with Boltzmann search to increase the exploitation capacity of the optimization efficiency. The selective mapping technique is applied to transform the candidate signal in the system. The ABC method increases exploration, and Boltzmann search increases exploitation. The enhanced ABC method increases the exploitation process that helps to overcome local optima traps and lower convergence. Square Root Raised Cosine (SRRC) precoding and Mu law compandor techniques were applied to reduce the PAPR. The Discrete Cosine Transform (DCT) technique is applied for domain conversion in the OFDM system. The proposed method has a convergence rate of 6.4069, and the existing one has a 6.4033 convergence rate. The enhanced ABC method provides higher efficiency in the MIMO-OFDM system regarding Symbol Error Rate (SER), PAPR, and Bit Error Rate (BER).

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Section: Introductionmentioning

confidence: 99%

Enhanced Artificial Bee Colony, Square Root Raised Cosine Precoding, and Mu law Compandor for Optimization of MIMO-OFDM System

Azeez¹,

Tarannum²

2023

Int. J. Adv. Sci. Eng. Inf. Technol.

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“…In the case of the latter problem, several PAPR reduction approaches have been proposed to overcome this difficulty of various multi‐carrier schemes such as References 7‐11. Specifically, for the GFDM technique, these approaches include clipping, 12,13 companding transforms, 13‐15 linear precoding, 16,17 and pulse shaping 18,19 .…”

Section: Introductionmentioning

confidence: 99%

Linear precoder design for peak‐to‐average power ratio reduction of generalized frequency division multiplexing signal using gradient descent methods

Sheikh‐Hosseini

Hasheminejad

Rahdari

2022

Trans Emerging Tel Tech

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This article addresses linear precoder design for the peak‐to‐average power ratio (PAPR) reduction of the generalized frequency division multiplexing (GFDM) scheme. This design relies on minimizing various statistical parameters of the instantaneous power of the GFDM signal—including variance, second and third moments—using gradient‐based optimization methods. In this regard, a general framework of four different scenarios, which employs the steepest descent and conjugate‐gradient methods and utilizes two different approaches of fixed and dynamic step‐sizing, is proposed. In the case of fixed step‐sizing, the results demonstrate that the algorithm diverges in some scenarios and provides low‐speed convergence for the others due to its inability in meeting the terminating threshold regarding minimizing objective function to a desirable level. However, dynamic step‐sizing using the Wolf line search rule circumvents these drawbacks, outperforms the existing research, and converges in all scenarios to a precoder providing advantages in terms of design speed and achievable PAPR, while keeping the symbol error rate and out‐of‐band emissions at the ranges of the un‐precoded GFDM systems. Moreover, the results confirm the comprehensiveness of the proposed framework in adapting to various GFDM statistical parameters and gradient methods.

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A Novel Scheme Ufmc-DSNT for Papr Reduction in 5g Systems

Al Qudami,

Ikni,

Redadaa

et al. 2023

Telecom Rad Eng

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The universal filtered multi-carriers (UFMC) waveform is a powerful candidate for multi-carrier modulation (MCM) that is employed in 5G systems. This is thanks to its low bit error rate (BER) and low latency compared to other waveforms, such as generalized frequency division multiplexing (GFDM). The high peak-to-average power ratio (PAPR) is one of the main challenges found in all MCM systems. As the output signal of the UFMC has large peaks, some distortions occur in the signal due to overshoot of the linear region of the high-power amplifier (HAP), which dramatically degrades the BER. Accordingly, it is known from several previous research studies that most proposals to reduce PAPR for the UFMC system have been difficult to implement or have required sending information in parallel to the receiver. For this reason, this paper proposes a new alternative, which is easily implemented and does not require the transmission of secondary information for PAPR reduction. This is done by applying the discrete sliding norm transform (DSNT) technique on the UFMC system, highlighting the proposed DSNT-UFMC scheme. As this previous scheme has not been addressed in any previous research work, it presents, the key contribution of this paper. The simulation results show that the proposed scheme outperforms the conventional one in terms of PAPR reduction, whose improvement reaches 94.6% using the proposed scheme.

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Quantized precoding and companding schemes for PAPR reduction in UFMC‐based massive MIMO downlink systems

Cited by 3 publications

References 32 publications

Enhanced Artificial Bee Colony, Square Root Raised Cosine Precoding, and Mu law Compandor for Optimization of MIMO-OFDM System

Enhanced Artificial Bee Colony, Square Root Raised Cosine Precoding, and Mu law Compandor for Optimization of MIMO-OFDM System

Linear precoder design for peak‐to‐average power ratio reduction of generalized frequency division multiplexing signal using gradient descent methods

A Novel Scheme Ufmc-DSNT for Papr Reduction in 5g Systems

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