<i>N</i>
            ‐PTS scheme with low complexity for PAPR reduction

Wei, Shanlin; Shen, Ying

doi:10.1049/joe.2016.0270

“…. L-1, q is any integer, r is any integer relatively prime to L. With the use of reordering and letting, q = 1 and r = 1 and substitute k = mN +l in equation (11) for L. Even we get R matrix which is a ZCT based row-wiseprecoding matrix of size L = (N X N) and can be written as: (12) In the ZCT precoding based OFDM system baseband modulated data is passed through S/P convertor which generates a complex vector of size N that can be written as X=[X0, X1, X2, ... XN -1] T . Then ZCT precoding is applied to this complex vector which transforms this complex vector into new vector of length N that can be written as Y=RX=[Y0, Y1, Y2 ...YN-1] T .…”

Section: A Zadoff Chumatrix Transform Precoding(zct)mentioning

confidence: 99%

“…These schemes involve coding schemes [6][7][8] which offer no distortion, but experience from bandwidth efficiency, complexity to find the optimum codes for an expansive number of subcarriers, and data rate loss (side information). Both PTS [9][10][11][12] and SLM [13][14][15][16] schemes accomplish significant PAPR lessening at the expense of high computational complexity and transmission rate loss (side information).…”

Section: Introductionmentioning

confidence: 99%

New Hybrid Schemes for PAPR Reduction in OFDM Systems

Nokaiee¹,

اليمن²,

Alkhawlani³

2018

JST

0

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The 3rd Generation Partnership Project (3GPP) introduced LTE to meet increasingly demands for communication services with high speed and quality. LTE uses OFDM in the form of OFDMA in the downlink and SCFDMA in the uplink combined with MIMO offering high data rate, high capacity and immunity against multipath channels. However, still the high PAPR of the LTE transmitted signal is the major problem affecting overall system performance degradation and power efficiency. A plenty of research has been devoted to reduce the performance degradation due to the PAPR problem inherent to LTE OFDM systems. A portion of the current techniques such companding methods have low-complexity, no constraint on modulation format and subcarrier size, good distortion and spectral properties; however, they have limited PAPR reduction capabilities. This paper proposes seven new hybrid schemes including Zaddoff Chu Matrix Transform (ZCT) precoding and six modern companding methods; Rooting Companding (RCT), New Error Function Companding (NERF), Absolute Exponential Companding (AEXP), Logarithmic Rooting Companding (LogR), Cosine Companding (COS) and Tangent Rooting Companding (TanhR). Furthermore, the seventh proposed hybrid scheme has been added incorporating ZCT precoding with new proposed companding called Advanced AEXP (AAEXP) companding. The developed methods are combining properties of both ZCT & Compandings, and achieving superior PAPR performance and optimal BER. Simulations results illustrate that the new seven proposed hybrid schemes achieve better PAPR reduction, and BER performance and the best achievement has been achieved by ZCT+AAEXP scheme. Companding Methods( ‫إ�ص��ارة‬ ‫اال‬ ‫�صغ��ط‬ ‫ط��رق‬ ‫وله��ا‬ ،)Subcarrier Size( ‫احلوام��ل‬ ‫ع��دد‬ ‫وحج��م‬ ‫الت�صم��ن‬ ‫�ص��كل‬ ‫عل��ى‬ ‫قي��ود‬ ‫وب��ا‬ ‫التعقي��د،‬ ‫ومنخف�ص��ة‬ ‫البحث‬ ‫هذا‬ ‫اق��رتح‬ ‫وقد‬ ‫�صئيل.‬ ‫مبق��دار‬ PAPR ‫ال�‬ ‫تقلل‬ ‫الط��رق‬ ‫هذه‬ ‫إن‬ ‫فا‬ ‫ذل��ك‬ ‫ومع‬ ‫جي��دة،‬ ‫طيفي��ة‬ ‫خ�صائ��ص‬ ‫م��ع‬ )ZCT(‫ا‬Zaddoff Chu Matrix Transform ‫م��ن‬ ‫مزي��ج‬ ‫أ�صا��ص‬ ‫ا‬ ‫عل��ى‬ ‫جدي��دة‬ ‫هجين��ة‬ ‫ط��رق‬ ‫�صبع��ة‬ New Error‫)،ا‬RCT(‫ا‬Rooting Companding ‫وه��ي‬ ‫إ�ص��ارة‬ ‫اال‬ ‫�صغ��ط‬ ‫ط��رق‬ ‫من‬ ‫خمتلفة‬ ‫أ�صالي��ب‬ ‫ا‬ ‫�ص��ت‬ ‫)،ا‬AEXP(‫ا‬Absolute Exponential Companding‫)،ا‬NERF(‫ا‬Function Companding ،)COS(‫ا‬Cosine Companding‫)،ا‬LogR(‫ا‬Logarithmic Rooting Companding ‫الهجين��ة‬ ‫الطريق��ة‬ ‫تطوي��ر‬ ‫مت‬ ‫ذل��ك‬ ‫إىل‬ ‫ا‬ ‫إ�صاف��ة‬ ‫باال‬ .)TanhR(‫ا‬Tangent Rooting Companding‫و‬ ‫مقرتح��ة‬ ‫جدي��دة‬ ‫طريق��ة‬ ‫م��ع‬ )ZCT(‫ا‬Zaddoff Chu Matrix Transform ‫ال��‬ ‫وجتم��ع‬ ‫ال�صابع��ة‬ ‫خ�صائ��ص‬ ‫ب��ن‬ ‫جتم��ع‬ ‫املتط��ورة‬ ‫الط��رق‬ ‫ه��ذه‬ ‫أن‬ ‫ا‬ ‫النتائ��ج‬ ‫أظه��رت‬ ‫ا‬ .)AAEXP(‫ا‬Advanced AEXP ‫ت�صم��ى‬

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“…. L-1, q is any integer, r is any integer relatively prime to L. With the use of reordering and letting, q = 1 and r = 1 and substitute k = mN +l in equation (11) for L. Even we get R matrix which is a ZCT based row-wiseprecoding matrix of size L = (N X N) and can be written as: (12) In the ZCT precoding based OFDM system baseband modulated data is passed through S/P convertor which generates a complex vector of size N that can be written as X=[X0, X1, X2, ... XN -1] T . Then ZCT precoding is applied to this complex vector which transforms this complex vector into new vector of length N that can be written as Y=RX=[Y0, Y1, Y2 ...YN-1] T .…”

Section: A Zadoff Chumatrix Transform Precoding(zct)mentioning

confidence: 99%

New Hybrid Schemes for PAPR Reduction in OFDM Systems

Nokaiee

¹

,

Alkhawlani

²

2018

JST

1

0

View full text Add to dashboard Cite

The 3rd Generation Partnership Project (3GPP) introduced LTE to meet increasingly demands for communication services with high speed and quality. LTE uses OFDM in the form of OFDMA in the downlink and SCFDMA in the uplink combined with MIMO oﬀering high data rate, high capacity and immunity against multipath channels. However, still the high PAPR of the LTE transmitted signal is the major problem aﬀecting overall system performance degradation and power efficiency. A plenty of research has been devoted to reduce the performance degradation due to the PAPR problem inherent to LTE OFDM systems. A portion of the current techniques such companding methods have low-complexity, no constraint on modulation format and subcarrier size, good distortion and spectral properties; however, they have limited PAPR reduction capabilities. This paper proposes seven new hybrid schemes including Zaddoff Chu Matrix Transform (ZCT) precoding and six modern companding methods; Rooting Companding (RCT), New Error Function Companding (NERF), Absolute Exponential Companding (AEXP), Logarithmic Rooting Companding (LogR), Cosine Companding (COS) and Tangent Rooting Companding (TanhR) companding. Furthermore, the seventh proposed hybrid scheme has been added incorporating ZCT precoding with new proposed companding called Advanced AEXP (AAEXP) companding. The developed methods are combining properties of both ZCT & Compandings, and achieving superior PAPR performance and optimal BER. Simulations results illustrate that the new seven proposed hybrid schemes can achieve better PAPR reduction, and BER performance and the best achievement has been achieved by ZCT+AAEXP scheme.

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