OQAM-OFDM系统中多块调频保留方案优化PAPR

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本文主要探讨了"OQAM-OFDM系统中用于减少峰值信噪比(Peak-to-Average Power Ratio, PAPR)的新型多块音调保留(Multi-Block Tone Reservation, MB-TR)方案"。OQAM-OFDM系统因其特有的交错幅度调制结构，传统的PAPR降低方法，如独立处理每个数据块的方法，在有效减少PAPR方面效果有限。OQAM-OFDM信号的重叠特性没有得到充分利用。 MB-TR方案的核心创新在于它利用了OQAM-OFDM信号的重叠特性，不再孤立地对待每个数据块，而是将相邻的数据块考虑在一起。这一方法的主要目的是通过联合分析来捕捉和模拟由于信号-clipping（限幅）产生的噪声特征。MB-TR方案通过采用加权最小二乘算法，设计一种峰值取消信号，其波形能够精确匹配信号峰点处的clipping噪声波形。这样做的目标是更有效地消除OQAM-OFDM信号的峰值，从而显著降低PAPR。实验结果和分析表明，与传统方法相比，MB-TR方案在保持信号质量和降低PAPR之间取得了更好的平衡。这种方法的优势在于它能够更好地适应OQAM-OFDM系统的特性，使得系统在高功率效率传输下，依然能保持信号的动态范围和抗干扰能力。这对于那些对带宽效率、功率效率和信号质量有高要求的应用，如广播、无线通信和卫星通信等领域具有重要的实际价值。这篇研究论文提出了一个新颖且有效的策略，旨在优化OQAM-OFDM系统的性能，特别是在PAPR管理方面，对于现代通信系统的设计和优化具有重要的理论支撑和技术参考作用。

IEEE TRANSACTIONS ON BROADCASTING, VOL. 61, NO. 4, DECEMBER 2015 717

A Novel Multi-Block Tone Reservation Scheme for

PAPR Reduction in OQAM-OFDM Systems

Tao Jiang, Chunxing Ni, Chen Ye, Yiting Wu, and Kai Luo

Abstract— Due to the overlapping structure of the offset quadrature

amplitude modulation-based orthogonal frequency-division multiplex-

ing (OQAM-OFDM) signals, the peak-to-average power ratio (PAPR)

in OQAM-OFDM systems cannot be efﬁciently reduced by existing

PAPR reduction methods, which independently consider the PAPR

reduction in each data block. In this paper, a novel multiblock tone

reservation (MB-TR) scheme is proposed for the PAPR reduction in

OQAM-OFDM systems. The key idea of the MB-TR scheme is to exploit

the overlapping structure of the OQAM-OFDM signals and jointly con-

sider the adjacent data blocks to obtain the clipping noise. To effectively

eliminate the peaks of the OQAM-OFDM signals, the MB-TR scheme

generates the peak-canceling signal by employing the weighted least

square algorithm to ﬁt the waveform of the peak-canceling signal to the

waveform of clipping noise. Simulation results and analysis show that

the MB-TR scheme could offer better PAPR reduction with lower com-

putational complexity than the clipping control tone reservation scheme

directly employed in OQAM-OFDM systems.

Index Terms—

Offset quadrature amplitude modulation-based

orthogonal frequency-division multiplexing (OQAM-OFDM),

peak-to-average power ratio, multi-block tone reservation,

weighted least square.

I. I

NTRODUCTION

RTHOGONAL frequency-division multiplexing (OFDM) offers

considerable high spectrum efﬁciency, multipath delay spread

tolerance, immunity to the frequency selective fading channels, high

power efﬁciency [1]. As a result, it has been chosen for high data

rate communications and has been widely used in many digital

broadcasting standards such as digital audio broadcasting (DAB),

digital video broadcasting (DVB), Long-Term Evolution (LTE) and

European Telecommunication Standards Institute (ETSI) Broadcast

Radio Access Network (BRAN) committees [2]. However, OFDM

systems have large spectral sidelobe due to the use of rectangular

window, which leads to the degradation of the spectral efﬁciency.

Moreover, the data transmission rate of OFDM systems is reduced

by the insertion of the cyclic preﬁx (CP) [3].

Manuscript received June 19, 2015; revised July 12, 2015; accepted July

21, 2015. Date of publication September 17, 2015; date of current ver-

sion December 5, 2015. This work was supported in part by the National

Science Foundation of China under Grant 61172052 and Grant 61271228, in

part by the National High Technology Development 863 Program of China

under Grant 2015AA01A710, and in part by the Key Program Research

Plan of the National Natural Science Foundation of Hubei, China, under

Grant 2013CFA055.

T. Jiang, C. Ni, and K. Luo are with the School of Electronic Information

and Communications, Huazhong University of Science and Technology,

Wuhan 430074, China (e-mail: tao.jiang@ieee.org).

C. Ye was with the School of Electronic Information and Communications,

Huazhong University of Science and Technology, Wuhan 430074, China.

She is now with Wuhan Zhongyuan Electronic Information Corporation,

Wuhan 430074, China.

Y. Wu is with the School of Physics and Technology, Wuhan University,

Wuhan 430072, China.

Color versions of one or more of the ﬁgures in this paper are available

online at http://ieeexplore.ieee.org.

Digital Object Identiﬁer 10.1109/TBC.2015.2465146

As a potential alternative to OFDM systems, offset quadrature

amplitude modulation based orthogonal frequency-division multiplex-

ing (OQAM-OFDM) has drawn signiﬁcant interests, which utilizes

a prototype ﬁlter with low spectral sidelobe and is less sensitive to

the frequency offset than OFDM systems [3]–[5]. The conventional

OQAM-OFDM systems offer extremely low spectral sidelobe, which

leads to signiﬁcant increase of the spectral efﬁciency. Moreover,

OQAM-OFDM systems can efﬁciently overcome the multi-path fad-

ing channel without the help of CP, resulting in the signiﬁcant

improvement of the data rate [6]. As discussed in [7], in the terres-

trial digital video broadcasting (DVB-T) standard, the OQAM-OFDM

technique can improve the data rate by 13% compared with OFDM.

Therefore, the OQAM-OFDM technique has been accepted as a

potential technique in many digital broadcasting systems, and it has

been considered as one of the key technologies in future wireless

communications [8].

Similar to OFDM systems, one of the main drawbacks for OQAM-

OFDM systems is the high peak-to-average power ratio (PAPR) of

the transmitted OQAM-OFDM signals. Since the high power ampli-

ﬁer (HPA) used in OQAM-OFDM systems has limited linear range,

the OQAM-OFDM signals with high PAPR will be seriously clipped

and nonlinear distortion will be introduced, resulting in serious degra-

dation of the bit error rate (BER) performance [2]. Moreover, the high

PAPR leads to the out-of-band radiation, which causes serious adja-

cent channel interferences [9]. In OFDM systems, various methods

have been proposed to reduce the PAPR in the literature, such as

clipping [10], partial transmit sequence (PTS) [11], active constel-

lation extension (ACE) [12], and tone reservation (TR) [13]–[15].

Nevertheless, it is not very effective to directly employ these meth-

ods in OQAM-OFDM systems, because the OQAM-OFDM signals

are overlapped with multiple adjacent data blocks and these methods

independently consider the PAPR reduction in each data block.

Recently, several schemes have been proposed speciﬁcally for the

PAPR reduction in OQAM-OFDM systems [7], [16]. In [16], an alter-

native signals (AS) scheme has been proposed to reduce the PAPR

of OQAM-OFDM signals, which jointly considers the current data

block and the previous data blocks to obtain the optimal phase rota-

tion sequence. However, the AS method needs extra spectral band

to transmit the optimal phase rotation sequence as side informa-

tion. Besides, a segmental PTS (S-PTS) technique has been proposed

in [7], which divides the overlapped OQAM-OFDM signals into a

number of segments and independently reduces the PAPR in each seg-

ment. However, the S-PTS method increases the bit error rate (BER)

since it destroys the orthogonality of OQAM-OFDM systems.

In this paper, we propose a novel multi-block tone reserva-

tion (MB-TR) scheme to reduce the PAPR in OQAM-OFDM

systems, which exploits the overlapping structure of the OQAM-

OFDM signals and jointly considers the adjacent data blocks for

PAPR reduction. For the MB-TR scheme, the clipping noise signal of

all the adjacent data blocks are ﬁrstly obtained by a certain clipping

threshold. To effectively eliminate the peaks of the OQAM-OFDM

signals, the MB-TR scheme generates the peak-canceling signal by

employing the weighted least square (WLS) algorithm to ﬁt the

0018-9316

 2015 IEEE. Personal use is permitted, but republication/redistribution requires IEEE permission.

See http://www.ieee.org/publications_standards/publications/rights/index.html for more information.

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