WO2011015119A1 - 一种带外功率抑制方法及装置 - Google Patents

一种带外功率抑制方法及装置 Download PDF

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WO2011015119A1
WO2011015119A1 PCT/CN2010/075617 CN2010075617W WO2011015119A1 WO 2011015119 A1 WO2011015119 A1 WO 2011015119A1 CN 2010075617 W CN2010075617 W CN 2010075617W WO 2011015119 A1 WO2011015119 A1 WO 2011015119A1
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signal
noise
noise signal
ofdm
ofdm signal
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PCT/CN2010/075617
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French (fr)
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姜勇
王艺
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华为技术有限公司
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00Modulated-carrier systems
    • H04L27/26Systems using multi-frequency codes
    • H04L27/2601Multicarrier modulation systems
    • H04L27/2647Arrangements specific to the receiver only
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00Modulated-carrier systems
    • H04L27/26Systems using multi-frequency codes
    • H04L27/2601Multicarrier modulation systems
    • H04L27/2626Arrangements specific to the transmitter only
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00Modulated-carrier systems
    • H04L27/26Systems using multi-frequency codes
    • H04L27/2601Multicarrier modulation systems
    • H04L27/2626Arrangements specific to the transmitter only
    • H04L27/26265Arrangements for sidelobes suppression specially adapted to multicarrier systems, e.g. spectral precoding

Definitions

  • the present invention relates to the field of wireless communications, and in particular, to an outband power suppression method and apparatus for an OFDM system. Background technique
  • multi-carrier modulation technology represented by OFDM (Or Thogona l Frequency Dimensional Mul t iplexing) is one of the most promising solutions.
  • the multi-carrier modulation technique decomposes the data stream into a plurality of relatively low-rate sub-data streams, and then demodulates the corresponding sub-carriers with the low-rate multi-state symbols formed at such low bit rates, thereby forming a plurality of low-rate symbols to be transmitted in parallel. Transmission system.
  • one of the disadvantages of the 0F MN signal is that the out-of-band attenuation of the power spectrum is not fast enough, causing interference to adjacent band data.
  • one method is to window each OFDM symbol so that the amplitude value of the edge of the symbol period gradually transitions to zero. You can use the raised cosine window, Hanning window, Gaussian window, etc.
  • the existing windowing technology increases the attenuation speed of the out-of-band power spectrum, it also causes a decrease in the length of the effective CP (Cyc ic Pre ix), thereby reducing the ability to resist intersymbol interference.
  • Embodiments of the present invention provide an out-of-band power suppression method and apparatus that overcomes the drawbacks of the prior art for out-of-band power suppression while reducing the effective CP length.
  • An embodiment of the present invention provides an outband power suppression method for an OFDM system, including:
  • the noise signal norm is the smallest, where N is a positive integer less than the length of the cyclic prefix.
  • an embodiment of the present invention provides an out-of-band power suppression apparatus, including:
  • a receiving module configured to receive an OFDM signal
  • the noise signal acquisition superposition module is configured to acquire and superimpose the noise signal, so that the first N sample time domain values of the cyclic prefix of the current OFDM signal after the noise is equal to the first N non-cyclic prefixes after the previous OF signal is added.
  • the sample time domain value, and the noise signal norm is the smallest, where N is a positive integer less than the cyclic prefix length.
  • the noise signal is generated by the principle of minimum norm solution, and is superimposed on the OFDM symbol, so that the time domain of the sample is continuously continuous in value, which can effectively accelerate the out-band power attenuation and increase the length of the effective CP. Increase the ability to resist intersymbol interference.
  • FIG. 2 is a schematic diagram of an OFDM signal according to an embodiment of the present invention.
  • FIG. 3 is a structural block diagram of an out-of-band power suppression apparatus according to an embodiment of the present invention. detailed description
  • an embodiment of the present invention provides an outband power suppression method, including:
  • N is a positive integer smaller than the length of the cyclic prefix, such that the current OFDM signal after the addition of noise and the previous OFDM signal of the previous noise are consecutive in the time domain value, and the minimum norm solution obtained is the obtained Noise
  • the noise is added, that is, 0 noise is added.
  • the noise acquisition and superposition of the 0FDM signal is performed.
  • the superposition of noise between adjacent 0FDM signals makes the time domain of the samples continuously increase in value, increasing the length of the effective CP and accelerating the attenuation of the out-of-band power.
  • step 102 the following (. Wide denotes a conjugate transpose of matrix and vector, and represents a transposed matrix vector 0-1 represents the inverse matrix.
  • the first 0FDM signal can be expressed as:
  • s i (m) j d kl e ⁇ -T g ⁇ m ⁇ T s - ⁇ (1) obviously exist adjacent OFDM signal amplitude and phase transition, resulting in a larger band power.
  • the first N samples of the cyclic prefix of the i-th (current) OFDM signal after noise addition are equal to the i-1 (previous) OFDM signal.
  • the first N samples of the cyclic prefix are not included in the time domain value, so that the first N samples of the i-th symbol can be regarded as the cyclic suffix of the i-1th symbol, such that the i-1th symbol and the i-th The symbols become continuous.
  • the same processing is performed on the i+1th symbol, so that the i-th symbol and the i+1th symbol are also made continuous, and so on. Therefore, the samples between the symbols are continuous, which can accelerate the attenuation of the out-of-band power and reduce the out-of-band power leakage.
  • N is usually less than 7;
  • the embodiment of the present invention can introduce a large noise on a subcarrier with strong anti-interference capability at one time, and introduce a comparison on a subcarrier with poor anti-interference capability.
  • Small noise, important or non-interfering subcarriers, ie subcarrier sets; no noise is introduced on subcarriers other than r' [ ..., , _ J.
  • is the final weighted frequency domain noise.
  • equation (6) has an infinite number of solutions, and a solution with the least interference noise can be obtained, that is,
  • the (oW ff (W 2 W F ) -1 matrix can be directly pre-stored, and it is not necessary to obtain t for online.
  • time domain continuous noise can be further obtained by inverse Fourier transform:
  • equation (7) can be established first, and (7) can be solved to obtain the minimum norm solution, that is, the solution with the smallest frequency domain norm; the IFFT for the obtained noise, and the time domain noise will be added to the corresponding On the time domain signal of the OFDM signal.
  • the minimum norm noise solution obtained by (7) can also be superimposed on the frequency domain signal of the OFDM signal, and the IFFT of the OFDM frequency domain signal with the noise superimposed thereon can obtain the OFDM signal with the time domain noise superimposed.
  • the first few samples of the CP are exactly equal to the first samples of the adjusted 1-1 OFDM signal without adding the CP, so that the signals are continuous and reduced.
  • a leak of out-of-band power As shown in FIG. 2, the CP of the first OFDM signal, that is, the first N samples of CPi, that is, the A part shown in the figure, and the first N samples of the first OFDM signal before the CP is added, That is, the part B shown in the figure is the same.
  • Fig. 2 It can be seen from Fig. 2 that the length of the CPi after the noise adjustment is larger than the CPi of the original OFDM, and it can be seen that the length of the effective CP increases, from the original 7; to r g +N.
  • embodiments of the present invention increase the effective CP length while effectively suppressing out-of-band leakage, thereby enhancing the ability to resist inter-symbol interference and inter-carrier interference.
  • An embodiment of the present invention further provides an out-of-band power suppression device. Referring to FIG. 3, the method includes:
  • a receiving module 301 configured to receive an OFDM signal
  • the noise signal acquisition superposition module 302 is configured to acquire and superimpose the noise signal, so that the first N sample time domain values of the cyclic prefix of the current OFDM signal after the noise is equal to the first N times of the previous OFDM signal after the noise is added without the cyclic prefix a time domain value, and the noise signal norm is the smallest, wherein N is less than the A positive integer with the length of the cyclic prefix.
  • the noise signal acquisition superposition module 302 adds a noise signal to the first OFDM signal, and the frequency domain energy of the acquired noise signal is distributed on all subcarriers of the OFDM signal capable of transmitting data, or on the idle data subcarrier. , or on the protection subcarrier.
  • the noise signal acquisition superposition module 302 may further include a weight setting module for setting the noise weight according to the anti-interference ability of the subcarrier, that is, in (6).
  • the noise signal acquisition module 302 can find the minimum norm solution according to (7), and the specific solution steps are described in detail in the above embodiments of the method.
  • the out-of-band power suppression device herein may be located within the transmitting end and may be placed at the base station or terminal to be connected to the modulation device.
  • the OFDM signals are continuous, and the length of the effective CP is increased, which can effectively accelerate the attenuation of the out-of-band power, thereby increasing the ability to resist inter-symbol interference.
  • RAM random access memory
  • ROM read only memory
  • EEPROM electrically programmable ROM
  • EEPROM electrically erasable programmable ROM
  • registers hard disk, removable disk, CD-ROM, or technical field. Any other form of storage medium known.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Noise Elimination (AREA)

Abstract

本发明实施例提供一种正交频分复用OFDM系统的带外功率抑制方法,包括:接收OFDM信号;获取并叠加噪声信号,使得加噪后当前OFDM信号的循环前缀的前N个样点时域值等于上一个OFDM信号加噪后不含循环前缀的前N个样 点时域值,且所述噪声信号范数最小,其中N为小于所述循环前缀长度的正整数。本发明实施例还提供一种带外功率抑制装置,用于发射机中,能有效加快带外功率抑制,同时增加了有效CP的长度,从而增加抗符号间干扰的能力。

Description

一种带外功率抑制方法及装置 本申请要求了 2009年 8月 5 日提交的, 申请号为 200910109559. 7发明 名称为 "一种带外功率抑制方法及装置" 的中国申请的优先权, 其全部内容 通过引用结合在本申请中。 技术领域
本发明涉及无线通信领域, 尤其涉及一种 OFDM系统的带外功率抑制方法 及装置。 背景技术
随着用户对各种实时多媒体业务需求的增长和互联网技术的迅速发展, 必将对无线通信的信息传输速率提出越来越高的要求。 为了支持更高的信息 传输速率和更高的用户移动速度, 在下一代无线通信系统中, 必须釆用频谱 效率更高、 抗多径干扰能力更强的无线传输技术。
当前各种高速率传输的无线方案中, 以 OFDM (Or thogona l Frequency Divi s ion Mul t iplexing , 正交频分复用)为代表的多载波调制技术是最有前 途的方案之一。 多载波调制技术将数据流分解为若干个速率相对较低的子数 据流, 用这样低比特率形成的低速率多状态符号再去调制相应的子载波, 从 而构成多个低速率符号并行发送的传输系统。 但是, 0F丽信号存在的一个不 足之处是功率谱的带外衰减速度不够快, 会造成对相邻频带数据的干扰。
为了加快 0FDM信号功率谱带外部分的下降速度,一种方法是对每个 0FDM 符号进行加窗处理, 使符号周期边缘的幅度值逐渐过渡到零。 可以釆用升余 弦窗、 汉宁窗、 高斯窗等。 现有的加窗技术虽增加了带外功率谱的衰减速度, 但同时引起有效 CP ( Cyc l ic Pref ix, 循环前缀)长度的降低, 进而降低了抗 符号间干扰的能力。 发明内容
本发明实施例提供一种带外功率抑制方法和装置, 克服现有技术中带外 功率抑制的同时有效 CP长度降低的缺陷。
本发明实施例提供一种 OFDM系统的带外功率抑制方法, 包括:
接收 OFDM信号;
获取并叠加噪声信号, 使得加噪后当前 OFDM信号的循环前缀的前 N个样 点时域值等于上一个 OFDM信号加噪后不含循环前缀的前 N个样点时域值, 且 所述噪声信号范数最小, 其中 N为小于所述循环前缀长度的正整数。
同时, 本发明实施例提供一种带外功率抑制装置, 包括:
接收模块, 用于接收 OFDM信号;
噪声信号获取叠加模块,用于获取并叠加噪声信号,使得加噪后当前 OFDM 信号的循环前缀的前 N个样点时域值等于上一个 OF丽信号加噪后不含循环前 缀的前 N个样点时域值, 且所述噪声信号范数最小, 其中 N为小于所述循环 前缀长度的正整数。 本发明实施例通过最小范数解原则生成噪声信号, 叠加到 OFDM符号上, 使得其样点的时域在数值上连续起来, 能有效加快带外功率衰减, 同时增加 了有效 CP的长度, 从而增加抗符号间干扰的能力。 附图说明
图 1为本发明实施例带外功率抑制方法流程图;
图 2为本发明实施例 OFDM信号示意图;
图 3为本发明实施例带外功率抑制装置结构框图。 具体实施方式
下面将结合本发明实施例中的附图, 对本发明实施例中的技术方案进行 清楚、 完整地描述, 显然, 所描述的实施例仅仅是本发明一部分实施例, 而 不是全部的实施例。 基于本发明中的实施例, 本领域普通技术人员在没有作 出创造性劳动前提下所获得的所有其他实施例 , 都属于本发明保护的范围。
参见图 1, 本发明实施例提供一种带外功率抑制方法, 包括:
101, 接收 OFDM信号;
102, 获取并叠加噪声信号, 使得加噪后当前 OFDM信号的循环前缀的前 N 个样点时域值等于上一个 OFDM信号加噪后不含循环前缀的前 N个样点时域 值, 且所述噪声信号范数最小。
其中 N为小于所述循环前缀长度的正整数, 这样加噪后的当前 OFDM信号 与上一个加噪后 OFDM信号在时域数值上连续起来, 且求出的最小范数解即 为所要获取的噪声;
其中, 对于第 1个 OFDM信号加噪后不变, 即添加 0噪声。
这样, 101中每接收一个 0FDM信号, 就进行该 0FDM信号的噪声获取及叠 加。 相邻的 0FDM信号间因噪声的叠加, 使得其样点的时域在数值上连续起 来, 增加了有效 CP的长度, 加快了带外功率的衰减。
下面对具体描述和分析步骤 102, 下述 (.广表示矩阵和向量的共轭转置, 表示矩阵和向量的转置, 0—1表示方阵的逆。
设 0FDM信号数据子载波的索引为 r=[t。, , f为数据子载波的 个数, 7;为循环前缀的 0FDM信号样点个数, ;为不含循环前缀的 0FDM信号样 点个数, 为第 ,个 0FDM信号的第 个子载波上的星座点数据,则第 ,个 0FDM 信号可以表示为:
^ km
]2π—
si(m) = jdkle Ί -Tg≤m≤Ts-\ (1) 显然相邻的 OFDM信号会存在幅度和相位的跳变, 导致带外功率较大。 为 了让符号间连续起来, 即前后样点的幅度和相位值连续, 可以在当前符号上 叠加一个连续噪声^ 表示为: si(m) = si(m) + bi(m\ -Tg≤m≤Ts-\ (2)
其中, 代表样点索引。
对第一个 OFDM信号 (i=l)不作调整, 即
SJ(m) = 51(m), -Tg≤m≤Ts -1 (3)
或 (m) = 0, _Tg <m<Ts_\。
对于第二个 OFDM信号 (i=2)以及后续的 OFDM符号,需要使得加噪后的信 号满足:
Figure imgf000005_0001
,Ν -\ (4) 由(4)可知, 加噪后第 i个(当前) OFDM信号的循环前缀的前 N个样点 时域值等于第 i-1 (上一个)个 OFDM信号加噪后不含循环前缀的前 N个样点 时域值,这样第 i个符号的前 N个样点就可以看作第 i-1个符号的循环后缀, 这样第 i-1个符号和第 i个符号之间变得连续起来。 同理, 对第 i+1个符号 进行相同的处理, 就可以使得第 i个符号和第 i+1个符号之间也变得连续起 来, 依次类推。 从而各个符号间的样点都连续起来, 从而可以加快带外功率 的衰减, 降低带外功率泄漏。 此处 N通常小于 7;。 通过对(4)变形, 进一步 可得到:
bt (-Tg+n)= bt (Ts -Tg +n)= st_, (") - st (- Tg+n),
Figure imgf000005_0002
·, and «=0,1,· · ·,Ν—\ ( 5 ) 此处, ^口^均已知, 同时, 可以使得连续噪声 的频率成分仅仅分布在 子载波集合 r' = [ , J上,此处应有^> ,设第 个载波上的频域噪声 数据为 同时可以根据各个载波抗干扰的能力, 为各个子载波设定一个实 的噪声加权系数 ( 〉0), 则 b1{Ts-Tg+n) = j kle Ts , i≥\, « = 0,1,···, Ν_\ (6) 本发明的实施例引入的噪声落在特定的子载波集合 r' = [ , J上; 权重设置时可以在抗干扰能力强的子载波上设置较大的权重值, 抗干扰能力 差的子载波上设置一个较小的权重值。 则本发明的实施例就可以一次性在抗 干扰能力强的子载波上引入较大噪声, 在抗干扰能力较差的子载波上引入较 小噪声, 重要的或者不能干扰的子载波, 即子载波集合; r' = [ ..., ,_ J之外 的子载波上则不引入噪声。
设 W为快速傅立叶逆变换 IFFT矩阵抽取第 7; -7;到 ; -7; +N-1行以及第 到 列的子矩阵, 则有如下表达式: b; = \νωβ, (7) 其中,
Figure imgf000006_0001
(8) 由 (5 )可得, 的每一个元素均已知。
此处
Figure imgf000006_0002
为需要 求取的频域噪声, ωβ,.为最终的加权频域噪声。
当^: '>N时式 (6)有无穷多组解, 可以求出一个干扰噪声最小的解, 也即
=b; (10)
Figure imgf000006_0003
由线性代数理论可以求得, 上式的最小范数解:
具体实现时可以直接预存 (oWff (W 2WF )— 1矩阵, 而不必在线求取 t 对于不区分各个载波抗干扰能力的情况, 权重可全设为 1, 则 β ί,λίΕΜ = ff \¥Wff ― b (12)
从而可以进一步通过傅立叶逆变换求得时域连续噪声:
^ km
]2π—
^(η = ^ω,β,ιΜΕΝε -Tg≤m≤Ts-\ (13) 将 (13)代入 (2), 则加噪后的信号可以表示为: ^(τη) = (τη) + ω,βιΜΕΝβ -Tg <m<Ts-\ (14) 这里, 连续噪声的分布可通过调整权重 以及 K '灵活控制, 如果 t '仅仅 包含保护子载波那么连续噪声仅仅分布在保护子载波上, 如果 κ' = κ, 那么连 续噪声分布在所有数据子载波上, 当然 也可以包含部分数据子载波加上保 护子载波, 即噪声信号的频域能量分布在 OFDM信号的所有能够传输数据的子 载波上, 或者空闲数据子载波上, 或者保护子载波上。。 具体可以先建立方程式(7 ), 求解(7 ), 获得最小范数解, 即频域噪声 范数最小的解; 对求出的噪声求 IFFT, 获取时域噪声 将 W∞)叠加到对 应的 OFDM信号的时域信号上。
当然, 也可以将(7 )获取的最小范数噪声解叠加在 OFDM信号的频域信 号上,对于叠加了噪声的 OFDM频域信号求 IFFT, 即可获取叠加了时域噪声的 OFDM信号。
加噪调整后的第 个 OFDM信号添加 CP后, CP的前几个样点恰好与调整后 的第 -1个 OFDM信号在未添加 CP的前几个样点相等, 从而信号间连续起来, 降低了带外功率的泄漏。 如图 2所示, 第 个 OFDM信号的 CP, 即 CPi的前 N 个样点, 即图中所示的 A部分, 与第 -1个 OFDM信号在未添加 CP前的前 N 个样点, 即图中所示的 B部分相同。
由图 2可知, 加噪调整后的 CPi的长度大于原 OFDM的 CPi, 可见有效 CP 的长度增大了, 由原来的 7;增加到 rg+N。 因而, 本发明的实施例在有效抑 制带外泄漏的同时, 还增加了有效 CP 长度, 从而增强了抗符号间干扰和载 波间干扰的能力。
本发明实施例还提供一种带外功率抑制装置, 参见图 3, 包括:
接收模块 301 , 用于接收 OFDM信号;
噪声信号获取叠加模块 302, 用于获取并叠加噪声信号, 使得加噪后当前 OFDM信号的循环前缀的前 N个样点时域值等于上一个 OFDM信号加噪后不含循 环前缀的前 N个样点时域值, 且所述噪声信号范数最小, 其中 N为小于所述 循环前缀长度的正整数。
其中, 噪声信号获取叠加模块 302对于第一个 OFDM信号, 叠加的噪声信 号为 0,获取的噪声信号的频域能量分布在 OFDM信号的所有能够传输数据的 子载波上, 或者空闲数据子载波上, 或者保护子载波上。 噪声信号获取叠加 模块 302还可以进一步包括权重设置模块, 用于根据子载波的抗干扰能力设 置加噪权重, 即 (6 ) 中的 。
噪声信号获取模块 302可以根据 ( 7 )求出最小范数解, 具体的求解步骤 上面关于方法的实施例里有详细介绍。
这里的带外功率抑制装置可以位于发射端之内, 可置于基站或终端, 与 调制装置相连。 通过噪声的叠加, 使得 OFDM信号间连续, 增加了有效 CP的 长度, 能有效加快带外功率衰减, 从而增加抗符号间干扰的能力。
本申请文件中所公开的实施例描述的各单元及算法步骤, 能够以电子硬 件、 计算机软件或者二者的结合来实现, 为了清楚地说明硬件和软件的可互 换性, 在上述说明中已经按照功能一般性地描述了各示例的组成及步骤。 这 些功能究竟以硬件还是软件方式来执行, 取决于技术方案的特定应用和设计 约束条件。 专业技术人员可以对每个特定的应用来使用不同方法来实现所描 述的功能, 但是这种实现不应认为超出本发明实施例的范围。
结合本文中所公开的实施例描述的方法或算法的步骤可以直接用硬件、 处理器执行的软件模块, 或者二者的结合来实施。 软件模块可以置于随机存 储器(RAM )、 内存、 只读存储器(ROM )、 电可编程 R0M、 电可擦除可编程 R0M、 寄存器、 硬盘、 可移动磁盘、 CD-R0M、 或技术领域内所公知的任意其它形式 的存储介质中。

Claims

权 利 要求 书
1、 一种正交频分复用 OFDM 系统的带外功率抑制方法, 其特征在于, 包 括:
接收 OFDM信号;
获取并叠加噪声信号, 使得加噪后当前 OFDM信号的循环前缀的前 N个样 点时域值等于上一个 OFDM信号加噪后不含循环前缀的前 N个样点时域值, 且 所述噪声信号范数最小, 其中 N为小于所述循环前缀长度的正整数。
1、 根据权利要求 1所述的方法, 其特征在于, 对于第一个 OFDM信号, 叠加的噪声信号为 0。
3、 根据权利要求 1所述的方法, 其特征在于, 所述噪声信号的频域能量 分布在 OFDM信号的所有能够传输数据的子载波上, 或者空闲数据子载波上, 或者保护子载波上。
4、 根据权利要求 2或 3所述的方法, 其特征在于, 所述获取并叠加噪声 信号, 包括:
根据子载波的抗干扰能力设置加噪权重。
5、根据权利要求 1所述的方法, 其特征在于, 所述获取并叠加噪声信号, 包括:
将所述噪声信号求快速傅立叶逆变换后,叠加到 OFDM信号的时域信号上; 或者,
将所述噪声信号叠加在 OFDM信号的频域信号上, 求快速傅立叶逆变换得 到时域信号。
6、 一种带外功率抑制装置, 其特征在于, 包括:
接收模块, 用于接收 OFDM信号;
噪声信号获取叠加模块,用于获取并叠加噪声信号,使得加噪后当前 OFDM 信号的循环前缀的前 N个样点时域值等于上一个 OF丽信号加噪后不含循环前 缀的前 N个样点时域值, 且所述噪声信号范数最小, 其中 N为小于所述循环 前缀长度的正整数。
7、 根据权利要求 6所述的装置, 其特征在于, 所述噪声信号获取叠加模 块对于第一个 OFDM信号, 叠加的噪声信号为 0。
8、 根据权利要求 6所述的装置, 其特征在于, 所述噪声信号获取叠加模 块获取的噪声信号的频域能量分布在 OFDM信号的所有能够传输数据的子载波 上, 或者空闲数据子载波上, 或者保护子载波上。
9、 根据权利要求 7或 8所述的装置, 其特征在于, 所述噪声信号获取叠 加模块进一步包括: 权重设置模块, 用于根据子载波的抗干扰能力设置加噪权重。
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