CN101669291A - 传送数据的方法和调制解调器 - Google Patents
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Abstract
介绍了一种传送数据的方法,包括:将所述数据调制到带有不同载频的多个载波上,从而产生传输信号;对所述传输信号的预定频带进行陷波处理,该预定频带否则将干扰外部传输;以及增高与所述预定频带相邻并且由于所述陷波处理步骤将衰减的载波。也介绍了一种对应的调制解调器(200)。
Description
技术领域
本发明涉及一种用于传送数据的方法和一种调制解调器。
背景技术
电力线通信(PLC)可能对固定无线电广播或其它外部传输有干扰。今天,PLC调制解调器具有用于业余无线电频带的固定陷波滤波器。用于固定陷波器的滤波器能使用高抑制和极陡的斜率实现。动态或智能陷波的概念允许PLC调制解调器检测固定无线电广播站的入口。已检测到无线电台的频率将被PLC忽略。为在PLC发射器中实现此操作,可使用自适应陷波滤波器以抑制预定频带的传输信号。这些自适应陷波滤波器也使相邻或与所述预定频带邻近的载波衰减,这是因为用于频率的动态抑制的陷波滤波器具有更弱的斜率,特别是在有许多单独的频率要进行陷波处理时。
发明内容
本发明的目的是提供一种用于传送数据的方法和一种调制解调器,这增强了用于PLC系统的自适应陷波器滤波的性能。
该目的通过一种传送数据的方法而得以解决,包括:
将所述数据调制到带有不同载频的多个载波上,从而产生传输信号;
对所述传输信号的预定频带进行陷波处理,所述预定频带否则将干扰外部传输;以及
增高(boost)与所述预定频带相邻并且由于所述陷波处理步骤将衰减的载波。
在又一方面,该目的通过一种调制解调器而得以解决,包括:
多个调制器,每个配置为将输入数据调制到多个载波之一上;
多个放大器,每个连接到所述多个调制器之一;
变换单元,连接到所述放大器并配置为计算来自每个所述放大器的信号的总和以生成传输信号;
陷波滤波器,连接到所述变换单元,所述陷波滤波器配置为对所述传输信号的预定频带进行陷波处理;
陷波控制单元,连接到所述陷波滤波器,并连接到所述放大器,所述陷波控制单元配置为调整对应于所述预定频带的所述放大器的放大率。
附图说明
从结合附图的本发明当前优选实施例的以下描述中,将更明白本发明的上述和其它目的、特性和优点,其中
图1示出带有多个陷波器的传送的信号的频谱,
图2以示意图方式示出带有自适应陷波滤波器的调制解调器的框图;以及
图3以示意图方式示出用于传送数据的方法的特性的框图。
具体实施方式
为实现灵活的陷波滤波器,使用了无限脉冲响应(IIR)滤波器。对应的滤波器结构以硬件方式固定地实现。在操作期间将滤波器系数编程(program)。在天线和调制解调器的对应测量单元进行无线电服务的入口检测之后,或者通过在电力线系统的电源(main)处探听噪声入口,决定要实现的陷滤器数量和要进行陷波处理的频带。硬件滤波器结构要对于所有滤波器频率和滤波器带宽都通用。通常,此通用滤波器具有弱斜率,并且衰减在PLC调制解调器内使用的正交频分复用(OFDM)方案的邻近或相邻载波。
图1示出传输信号的传输频谱的一个示例,其中,一些灵活的陷波滤波器略去了一些频率。原功率谱密度(PSD)应是通过1kHz的分辨带宽(ResBW)测量的-40dBm。例如,在图1中,大约10.2MHz到11MHz的频率应具有-40dBm的传送PSD。由于在9.5MHz和11.7MHz处的陷波滤波器的边侧抑制原因,大约在10.2MHz到11MHz的通信频谱衰减了10dB或更多。
借助于如图2所示的调制解调器200,能将在大约10MHz到11MHz载频处的OFDM载波放大、增高或预失真至少大约与陷波滤波器的弱斜率将它们衰减的相同量。在此实施例中,所有传送的载波将具有相同的功率谱密度。这提高了在接收器处的信噪比(SNR),并且允许在自适应OFDM系统处使用涉及的载波的更高星座。
在图2中,以示意图方式示出调制解调器200的OFDM部分,其中,载波的振幅能单独调整。有效负载数据传送到前馈纠错(FEC)单元202。之后,复数n个对应的正交调幅器(QAM)204_1、204_2、204_3、...、204_n将各个比特的信息映射到其复的星座点。每个正交调幅器(QAM)204_1、204_2、204_3、...、204_n连接到复数n个放大器206_1、206_2、206_3、...、206_n之一,并且复数n个载波的对应载波乘以所述放大器的振幅因子。已知要进行陷波处理的载波可在此阶段已经变得被抑制,并且未注入总和中。在变换单元208中,即逆快速傅立叶变换(IFFT)单元中将所有活动载波相加,并且在时域中生成传输信号。由于OFDM系统的弱边侧环路抑制(side loopsuppression)原因,此信号将由灵活的陷波滤波器210另外滤波,并且之后由数模转换器(DAC)212进行数模转换,并传送到对应的接收器(未示出)。
灵活的陷波滤波器210也能将与已陷波处理的频带相邻的频率衰减。此非所需的边侧衰减能通过受影响载波的预放大而得到补偿。
OFDM系统的所示实施例能够单独设置每个载波的振幅。这可通过将在对应QAM映射器204_1、204_2、204_3、...、204_n之后的每个受影响载波乘以其振幅因子而实现。此乘法将载波增高或放大与由灵活的陷波滤波器210产生的此载波的衰减量相同或至少大约相同的量。由灵活的陷波滤波器210产生的每个载波的衰减的值能从灵活的陷波滤波器210的频率响应得出。
此实施例确保载波被增高到其原(未衰减)电平。因此,超出调节限制的PSD的放大率能得以避免。
提供连接到灵活的陷波滤波器210和放大器206_1、206_2、206_3、...、206_n的陷波控制单元214,陷波控制单元214配置为设置灵活的陷波滤波器210的滤波系数,计算滤波器210的频率响应,并通过设置对应的振幅因子增高或放大衰减的载波。陷波控制单元214可连接到天线216和对应的第一测量单元218以确定例如在短波频道上外部传输的频带,例如,象无线电业余频带或从无线电台的无线电传输。也在图2中示出的另一实施例,包括又一测量单元220,该单元配置为探听在电源222上的噪声入口以便确定所述频带。调制解调器200可包括天线216和第一测量单元218和/或通过使用折线以示意图方式示出的备选或组合的又一测量单元218。
这些测量出的频带能用于对应地确定所述灵活的陷波滤波器210的所述滤波系数,以便对传输信号的对应部分进行陷波处理,并且相应地调整对应的振幅因子。
在图3中,以示意图方式示出用于传送数据的方法的框图。在第一步骤S1中,测量噪声入口并且检测应进行陷波处理的频带。在第二步骤S2中,计算用于陷波滤波器210的滤波系数,并且确定陷波滤波器210的对应频率响应。在第三步骤S3中,评估由此频率响应引起的所使用的相邻载波的衰减,并在步骤S4中对放大器206_1、206_2、206_3、...、206_n编程以增高载波。
参考标号
200 调制解调器
202 前向纠错单元
204_1,204_2,正交调幅器QAM
204_3,...,204_n
206_1,206_2,放大器
206_3,...,206_n
208 逆快速傅立叶变换单元
210 灵活的陷波滤波器
212 数模转换器
214 陷波控制单元
216 天线
218 测量单元
220 又一测量单元
222 电源
S1 第一步骤
S2 第二步骤
S3 第三步骤
S4 第四步骤
Claims (10)
1.一种传送数据的方法,包括:
将所述数据调制到带有不同载频的多个载波上,从而产生传输信号;
对所述传输信号的预定频带进行陷波处理,所述预定频带否则将干扰外部传输;以及
增高与所述预定频带相邻并且由于所述陷波处理步骤将衰减的载波。
2.如权利要求1所述的方法,其中
通过评估所述传输信号的哪些频带将干扰外部传输,预先确定所述传输信号的所述预定频带。
3.如权利要求1或2所述的方法,还包括:
确定用于所述相邻载波的衰减量;
将所述载波增高所述确定的量。
4.如权利要求1到3任一项所述的方法,还包括:
测量外部传输的频带;
将所述预定频带调整为所述测量出的频带;以及
使所述增高步骤适应与所述调整的预定频带相邻的载波。
5.一种用于传送数据的调制解调器(200),包括:
多个调制器(204),每个所述调制器配置为将输入数据调制到多个载波之一上;
多个放大器(206),每个所述放大器连接到所述多个调制器(204)之一;
变换单元(208),连接到所述放大器(206)并配置为计算来自每个所述放大器(206)的信号的总和以生成传输信号;
陷波滤波器(210),连接到所述变换单元(208),所述陷波滤波器(210)配置为对所述传输信号的预定频带进行陷波处理;
陷波控制单元(214),连接到所述陷波滤波器(208),并连接到所述放大器(206),所述陷波控制单元(214)配置为对应于所述预定频带来调整所述放大器的所述放大率。
6.如权利要求5所述的调制解调器(200),其中
所述陷波控制单元(214)配置为将落入所述预定频带内的载波的所述放大率调整为零。
7.如权利要求5或6任一项所述的调制解调器(200),其中
所述陷波控制单元(214)配置为使与所述预定频带相邻的载波的所述放大率适应大约等于所述相邻载波由于所述陷波滤波器(210)原因的衰减量的量。
8.如权利要求5或7任一项所述的调制解调器(200),还包括:
天线(216)和用于测量外部传输的频带的对应测量单元(218);以及
其中所述陷波控制单元(214)配置为调整所述陷波滤波器(210)以对落入所述测量出的频带内的所述传输信号的频带进行陷波处理,并且还配置为使所述放大率的量适应所述陷波滤波器(210)的所述调整。
9.如权利要求5或8任一项所述的调制解调器(200),还包括:
又一测量单元(200),配置为测量电力线系统的电源(222)上噪声入口的频带;以及
其中所述陷波控制单元(214)配置为调整所述陷波滤波器(210)以对落入所述测量出的频带内的所述传输信号的频带进行陷波处理,并且还配置为使所述放大率的量适应所述陷波滤波器(210)的所述调整。
10.如权利要求5到9任一项所述的调制解调器(200),其中
所述变换单元(208)被构建为逆快速傅立叶变换单元。
Applications Claiming Priority (3)
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EP07003693A EP1962438A1 (en) | 2007-02-22 | 2007-02-22 | Method of transmitting data and modem |
EP07003693.4 | 2007-02-22 | ||
PCT/EP2007/007753 WO2008101523A1 (en) | 2007-02-22 | 2007-09-05 | Method of transmitting data and modem |
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CN101669291A true CN101669291A (zh) | 2010-03-10 |
CN101669291B CN101669291B (zh) | 2013-08-21 |
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US (1) | US8401062B2 (zh) |
EP (1) | EP1962438A1 (zh) |
KR (1) | KR101387269B1 (zh) |
CN (1) | CN101669291B (zh) |
BR (1) | BRPI0721317A2 (zh) |
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EP1162803A1 (en) * | 2000-06-05 | 2001-12-12 | Telefonaktiebolaget L M Ericsson (Publ) | Frequency tracking device and method for a receiver of a multi-carrier communication system |
US8077795B2 (en) * | 2005-10-03 | 2011-12-13 | Telefonaktiebolaget Lm Ericsson (Publ) | Apparatus and method for interference mitigation |
EP2020758A1 (en) | 2007-08-01 | 2009-02-04 | Sony Corporation | Method for transmitting a signal over a power line channel and power line communication modem |
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2007
- 2007-02-22 EP EP07003693A patent/EP1962438A1/en not_active Withdrawn
- 2007-09-05 US US12/524,878 patent/US8401062B2/en active Active
- 2007-09-05 KR KR1020097017472A patent/KR101387269B1/ko active IP Right Grant
- 2007-09-05 CN CN2007800515612A patent/CN101669291B/zh not_active Expired - Fee Related
- 2007-09-05 WO PCT/EP2007/007753 patent/WO2008101523A1/en active Application Filing
- 2007-09-05 BR BRPI0721317-4A2A patent/BRPI0721317A2/pt not_active Application Discontinuation
- 2007-09-05 RU RU2009135265/08A patent/RU2449487C2/ru active
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN105637792A (zh) * | 2013-10-11 | 2016-06-01 | 高通股份有限公司 | 动态发射功率和信号成形 |
US9608696B2 (en) | 2013-10-11 | 2017-03-28 | Qualcomm Incorporated | Dynamic transmit power and signal shaping |
Also Published As
Publication number | Publication date |
---|---|
RU2009135265A (ru) | 2011-03-27 |
WO2008101523A1 (en) | 2008-08-28 |
KR20090115159A (ko) | 2009-11-04 |
US20100027600A1 (en) | 2010-02-04 |
BRPI0721317A2 (pt) | 2014-02-18 |
KR101387269B1 (ko) | 2014-04-18 |
RU2449487C2 (ru) | 2012-04-27 |
EP1962438A1 (en) | 2008-08-27 |
CN101669291B (zh) | 2013-08-21 |
US8401062B2 (en) | 2013-03-19 |
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