CN115001918B - 一种恒包络正交频分复用***多址接入方法 - Google Patents
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- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/0264—Arrangements for coupling to transmission lines
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- H04L27/18—Phase-modulated carrier systems, i.e. using phase-shift keying
- H04L27/20—Modulator circuits; Transmitter circuits
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- H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
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Abstract
本发明属于无线通信技术领域,涉及一种恒包络正交频分复用(Constant Envelope OFDM,CE‑OFDM)的多址接入方法。本发明提出了一种用户载波偏移的多址接入方法,在CE‑OFDMA***中,通过不同用户进行不同的相位旋转,降低了用户间的数据混叠,减少用户间干扰,提升***性能。
Description
技术领域
本发明属于无线通信技术领域,涉及一种基于相位旋转的恒包络正交频分复用(Constant Envelope Orthogonal Frequency Division Multiplexing,CE-OFDM)的多址接入方法。
背景技术
正交频分多址(Orthogonal Frequency Division Multiple Access,OFDMA)将OFDM和频分多址(frequency division multiple access,FDMA)技术结合,具有良好的抗多径效应和多用户干扰能力,已成为第3代到第五代移动通信、无线局域网等无线通信***的物理层多址接入方案。但OFDMA***发送信号较单载波波形存在过高的峰值平均功率比(Peak to Average Power Ratio,PAPR),进而降低功率放大器的功率利用率,影响无线接入网络,特别是上行多址接入的有效覆盖范围。针对传统OFDM波形的高PAPR问题,CE-OFDM技术通过相位调制将OFDM时域符号进一步调制到恒包络载波信号的相位上,形成具有0dBPAPR特性的CE-OFDM基带发送波形,保证了功率放大器的工作效率。
虽然CE-OFDM中的相位调制操作降低了发送信号的PAPR波动,但非线性相位调制过程也破坏了子载波间的正交性,造成用户的子载波分量相互重叠,引入用户间干扰,从而导致***传输性能降低。针对用户间干扰问题,本发明提出了一种适用于CE-OFDM的新型多址接入方法。该方法通过改进用户载波偏移,缓解了用户间数据混叠,降低用户间干扰,可有效改善***传输性能。
发明内容
本发明提出了一种用户载波偏移的多址接入方法,不同用户通过不同的相位旋转,减少不同用户的子载波分量混叠,降低相位调制带来的用户间干扰,实现子带频分复用。
本发明的技术方案是:
在CE-OFDMA***中,其中子载波数为N,总用户数为U,过采样倍数为Q,每个用户所占用的子载波数为Ni=N/U,有效子载波数Nc=Ni/2,其中i=1,2,...,U表示第i个用户。所述方法包括以下步骤:
发射端:
其中,Nzp=N(Q-1),(·)*表示共轭,01×N表示一个一行N列的零向量;
φi=2πhCNxi[n]
其中,NCP为循环前缀长度;
接收端:
Y=H1S'1+H2S'2+…+HUS'U+W
其中,Ki=(i-2)Ni;
本发明的有益效果是:在CE-OFDMA***中,通过不同用户进行不同的相位旋转,降低了用户间的数据混叠,减少用户间干扰,提升***性能。
附图说明
图1为本发明的***框图;
具体实施方式
下面结合附图和实施例,详细描述本发明的技术方案:
实施例:
考虑一个上行CE-OFDM***,其中子载波数为N=32,总用户数为U=2,过采样倍数为Q=2,每个用户所占用的子载波数为Ni=N/U=16,有效子载波数Nc=Ni/2=8,其中i=1,2,采用QPSK调制。以用户2为例进行说明。所述方法包括以下步骤:
发射端:
X(2)=[0,0.7+0.7j,0.7+0.7j,-0.7-0.7j,0.7+0.7j,0.7-0.7j,-0.7-0.7j,-0.7-0.7j]T
x(2)=[0.021,0.054,0.082,…,0.009,-0.005,-0.001]T
s(2)=[0.992+0.126j,0.950+0.310j,0.888+0.458j,…,0.998+0.055j,0.999-0.315j,1.00-0.007j]T
S(2)=[7.56+0.019j,-0.472+0.615j,-0.446+0.446j,…,-0.547-0.486j,0.568+0.506j,0.472+0.369j]T
s'(2)=[0.124+0.015j,-0.038+0.118j,-0.111-0.057j,…,-0.007+0.124j,-0.124+0.003j,-0.001-0.125j]T
s'cp (2)=[-0.124+0.003j,-0.001-0.125j,0.124+0.015j,-0.038+0.118j,,...,-0.124+0.003j,-0.001-0.125j]T
假设过高斯信道,不加噪声,则Y(2)=S'(2)。
接收端:
此示例由于上述假设即可跳过步骤9和步骤10,直接进行步骤11操作。
本发明中的方法通过不同用户进行不同的频域偏移,来降低用户间干扰。以本实施例为例,如果在步骤2时将不同用户映射到不同的频域,且步骤6不进行偏移,则为传统上行CE-OFDM多址接入方法,从步骤7能看出本发明中不同用户的直流分量被分开,同时相比传统上行CE-OFDM***,用户间的干扰更小。
Claims (1)
1.一种基于恒包络正交频分复用的多址接入方法,用于CE-OFDMA***,***中子载波数为N,总用户数为U,过采样倍数为Q,每个用户所占用的子载波数为Ni=N/U,有效子载波数Nc=Ni/2,其中i=1,2,…,U表示第i个用户,其特征在于,所述方法包括以下步骤:
发射端:
Xi=[0,Xi(1),Xi(2),…,Xi(Nc-1)]T
其中,Nzp=N(Q-1),(·)*表示共轭,01×N表示一个一行N列的零向量;
φi=2πhCNxi[n]
s'cp i=[s'i[NFFT-NCP+1],...,s'i[NFFT-1],s'i[0],s'i[1],...,s'i[NFFT-1]]T
其中,NCP为循环前缀长度;
接收端:
Y=H1S'1+H2S'2+...+HUS'U+W
其中,Ki=(i-2)Ni;
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PCT/CN2023/096069 WO2024021814A1 (zh) | 2022-07-25 | 2023-05-24 | 一种恒包络正交频分复用***多址接入方法 |
US18/517,215 US20240106685A1 (en) | 2022-07-25 | 2023-11-22 | Multiple-access constant envelope orthogonal frequency division multiplexing method and system |
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