共查询到19条相似文献,搜索用时 140 毫秒
1.
2.
一种降低OFDM信号PAPR的改进PTS方法 总被引:1,自引:0,他引:1
正交频分复用(OFDM)系统的一个主要缺点是信号的峰值功率与平均功率比(PAPR)很高。本文研究了利用信号扰码技术降低OFDM系统峰均比的一种典型算法:部分传输序列法(PTS),提出了一种将随机分割方法、交织分割方法与迭代移位搜索加权因子相结合的改进PTS算法。仿真结果表明,改进后的算法在改善PAPR性能和计算的复杂度之间取得了较好的折衷。 相似文献
3.
4.
降低OFDM系统中PAPR的次优化PTS算法 总被引:1,自引:1,他引:0
正交频分复用(OFDM)系统的主要缺点是峰均功率比(PAPR)增大会严重地降低了发射机中高功率放大器(HPA)的效率.部分传输序列(PTS)算法能有效地降低OFDM信号的PAPR概率,但随着PTS中分割子块的增多也带来了高的计算复杂度.为此,文中提出一种新的PTS算法,该算法比传统的穷尽搜寻法具有更佳的性能.仿真结果表明,文中所提PTS算法在降低PAPR相似的情况下,具有更小的计算复杂度. 相似文献
5.
6.
正交频分复用(Orthogonal Frequency Division Multiplexing,OFDM)系统的一个主要缺点是信号的峰均比(Peak to Average Power Ratio,PAPR)较高,部分传输序列(Partial Transmit Sequence,PTS)算法能够有效地解决该问题。由于PTS基本算法的计算复杂度较高,需采用适当的分割方法降低其计算复杂度。在分析了相邻、随机、交织分割方法基本原理的基础上,提出了一种将随机分割和交织分割相结合的随机交织分割方法,并仿真验证了在不同的分组数条件下这4种分割方法的有效性。仿真结果表明,不同的分割方法均能有效的降低系统的PAPR,实际使用时需考虑各种方法的计算复杂度。 相似文献
7.
PTS与限幅结合降低OFDM峰均比的改进算法 总被引:2,自引:2,他引:0
提出了一种基于部分传输序列(PTS)算法和限幅算法相结合的改进算法来降低正交频分复用(OFDM)系统的峰均功率比(PAPR).该算法先利用PTS算法对OFDM信号进行处理从而选择出限幅噪声最小的一路OFDM信号,所得OFDM信号再利用限幅法进行处理.因此可有效改善OFDM信号经过限幅引起的限幅噪声,减小限幅对OFDM系统的影响.数据仿真验证了所提方法的有效性. 相似文献
8.
9.
部分传输序列(PTS)是一种复杂度较高的减小正交频分复用(OFDM)系统峰均功率比(PAPR)的方法。文中介绍了两种降低PTS复杂度的方法,一种是m序列PTS,另一种是迭代移位线性搜索法PTS。并将这两种方法应用到基于IEEE802.16a的OFDM系统中,仿真表明这两种方法都能够降低PTS的复杂度,同时减小系统的PAPR。 相似文献
10.
11.
12.
1 IntroductionOrthogonalFrequencyDivisionMultiplexing(OFDM) [1~5] isapromisingtechniqueforhighda ta ratetransmission ,especiallyinwirelesscommuni cationsystems,whichcaneffectivelyminimizeIn tersymbolInterference (ISI)causedbydelayspreadawingtomultipathfading .… 相似文献
13.
14.
The peak-to-average power ratio (PAR) of an orthogonal frequency-division multiplexing (OFDM) signal can be substantially larger than that of a single carrier system. Partial transmit sequence (PTS) combining can improve the PAR statistics of an OFDM signal. As PTS requires an exhaustive search over all combinations of allowed phase factors, the search complexity increases exponentially with the number of subblocks. In this letter, we present a new algorithm for computing the phase factors that achieves better performance than the exhaustive search approach 相似文献
15.
A partial transmit sequence technique with error correction capability and low computation
下载免费PDF全文
![点击此处可从《International Journal of Communication Systems》网站下载免费的PDF全文](/ch/ext_images/free.gif)
Hsin‐Ying Liang Hung‐Chi Chu Chuan‐Bi Lin Kuang‐Hao Lin 《International Journal of Communication Systems》2014,27(12):4014-4027
Orthogonal frequency division multiplexing (OFDM) is a popular transmission technique in wireless communication. Although already widely addressed in many studies, OFDM still has flaws, one of which is the occurrence of high peak‐to‐average power ratio (PAPR) in the transmission signal. The partial transmit sequence (PTS) technique is one method adopted to reduce high PAPR in OFDM systems. However, as PTS utilizes phase factors to generate multiple candidate signals, large amounts of calculation and time are required to search the candidate signal with the minimal PAPR, which will then be adopted as the final transmission signal. This paper proposes a novel PAPR reduction method, which can be applied in OFDM systems with M‐ary phase‐shift keying modulation. It not only requires less computation but also possesses error correction capabilities. More precisely, the proposed method is to divide a block‐coded modulation code into the direct sum of a correcting subcode for encoding information bits and a scrambling subcode for generating phase factors. Our proposed method is a suboptimal technique with low computation, because it uses a genetic algorithm with a partheno‐crossover operator as the transmitted signal selection mechanism. Simulation results show our proposed method has better PAPR performance than the GA‐PTS scheme. Based on the simulation results in Figures 5 and 6, it is evident that our proposed method can be employed in any OFDM system by using M‐PSK modulation.Copyright © 2013 John Wiley & Sons, Ltd. 相似文献
16.
17.
基于随机分割的PTS改进算法研究 总被引:2,自引:1,他引:1
正交频分复用(OFDM)系统的一个主要缺点是信号的峰均功率比(PAPR)很高。提出了一种将随机分割方法与迭代移位搜索加权因子相结合的改进PTS算法。仿真结果表明,改进后的算法在改善PAPR性能和计算的复杂度之间取得了较好的折衷。 相似文献
18.
利用互补序列降低OFDM信号PAR 总被引:1,自引:0,他引:1
正交频分复用(OFDM)是下一代高速通信系统的一项关键技术,峰平比(PAR)过高是限制OFDM技术应用的一个关键因素。为了降低OFDM信号的峰平比,基于格雷互补序列和Reed-Muller码的关系,提出一种构造互补序列的分组编码方法。仿真结果表明,该分组编码方法可以将OFDM信号的PAR降为3.01dB. 相似文献