CN103581917A  Frequency spectrum coexisting method and frequency spectrum processing device used for OFDM system  Google Patents
Frequency spectrum coexisting method and frequency spectrum processing device used for OFDM system Download PDFInfo
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 CN103581917A CN103581917A CN201210263032.1A CN201210263032A CN103581917A CN 103581917 A CN103581917 A CN 103581917A CN 201210263032 A CN201210263032 A CN 201210263032A CN 103581917 A CN103581917 A CN 103581917A
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用于OFDM系统的频谱共存方法和频谱处理装置 Spectrum coexistence method for OFDM system and a spectrum processing means
技术领域 FIELD
[0001] 本发明涉及移动通信应用技术领域，尤其涉及一种用于OFDM系统的频谱共存方法和频谱处理装置。 [0001] The present invention relates to a mobile communication technology applications, and in particular relates to a method of spectrum and spectrum coexistence processing apparatus for an OFDM system.
背景技术 Background technique
[0002] 随着人们对高速无线传输的需求增强，各种高带宽、高速率的新无线通信系统纷纷诞生，诸如802.lln、LTE (Long Term Evolution:长期演进)、WiMax(WorldwideInteroperability for Microwave Access)以及WiGig (Wireless Gigabit:无线千兆比特)等，而其中的大部分高速无线通信系统都使用了正交频分复用OFDM (Orthogonalfrequencydivision multiplexing)技术。 [0002] As the demand for highspeed wireless transmission enhancements, a variety of highbandwidth, new wireless communication systems have a high rate of birth, such as 802.lln, LTE (Long Term Evolution: Long Term Evolution), WiMax (WorldwideInteroperability for Microwave Access ) and WiGig (wireless Gigabit: Gigabit wireless) or the like, most of which highspeed wireless communication systems use orthogonal frequencydivision multiplexing OFDM (Orthogonalfrequencydivision multiplexing) technology. 伴随着移动互联网的兴起,视频、大数据传输的无线传输需求与日俱增，未来以上述无线通信技术为基础的系统必然会极大的提高接入网络的设备数量，庞大的无线接入量会导致其对频谱的需求不能为现有分配频率或是规划中移动通信和无线接入频率所承载，因此如何解决无线通信技术在未来发展中的频谱紧缺问题也是研究的重点之一。 With the rise of mobile Internet, the demand for wireless transmission of video, large data transmission is growing, the number of devices to the future of the wireless communication technologybased access network greatly improves the system inevitably, a large amount of lead to its wireless access demand for spectrum allocation of frequencies can not be carried by existing or planned mobile communications and wireless access frequency, so how to solve one of the key technologies of wireless communication spectrum shortage problem in the future is the development of research.
[0003] 针对这一问题，近年来，除了避开已有无线系统频率的常规方法外，还出现了认知无线电(CR)技术，其基本思想是通过与工作环境的交互，改变无线电设备的发射机参数，以达到和其它系统频谱共存的目的。 [0003] To solve this problem, in recent years, in addition to the conventional way to get around the existing wireless system frequency, also appeared in cognitive radio (CR) technology, the basic idea is to interact with the work environment, changes in the radio equipment transmitter parameters, and other systems for the purpose of spectrum coexist. 如一OFDM无线通信系统根据感知的移动通信系统信号，在其活跃状态下采取制造频谱凹陷的方式避免干扰移动通信系统；在非活跃状态下，OFDM系统满载运行，从而使同一段频谱满足两种系统的需要。 The OFDM wireless communication system such as a mobile communication system signal perceived spectrum taken manufactured recessed manner in its active state to avoid interference with the mobile communication system; in the inactive state, OFDM systems full load operation, so that the same piece of spectrum to meet the two systems It needs. 但是，对于OFDM系统，如果仅仅关闭存在频谱信号冲突干扰处的子载波，由于其它子载波旁瓣功率的影响，并不能达到良好的频谱凹陷，同时实现也较复杂，局限了频谱共存的效果。 However, for OFDM systems, if only close subcarriers exist spectrum signal collision interference at, due beside the other subcarriers lobe power, and can not achieve good spectral recess, while the implementation is more complex, the limitations of the effects of spectrum coexist.
发明内容 SUMMARY
[0004] 有鉴于此，本发明要解决的一个技术问题是提供一种用于OFDM系统的频谱共存方法，通过插入重构子载波数据形成OFDM频谱凹陷，避免与共存系统相互干扰。 [0004] In view of this, a technical problem to be solved by the present invention is to provide a method for coexistence spectrum OFDM system, OFDM spectrum recess, to avoid mutual interference with the coexistence system is formed by inserting the reconstructed data subcarriers.
[0005] 一种用于OFDM系统的频谱共存方法，计算OFDM系统与共存系统在频率重叠处的系数矩阵，根据所述系数矩阵获取所述OFDM系统中其它子载波旁瓣在共存频率处的功率影响；获取对应于各个共存系统的重构子载波矩阵，并作预存储；根据所述重构子载波矩阵计算重构子载波序列，并将所述重构子载波序列插入所述OFDM系统的原数据序列中，形成陷波。 [0005] A spectrum coexistence method for OFDM systems, OFDM systems with coexistence system calculates the coefficient matrix at the frequency overlap, the matrix obtained by the OFDM system, the subcarriers other side lobe power coexistence based on the frequency coefficients Effect; Get coexistence system corresponding to each subcarrier reconstruction matrix, and for prestored; calculating a reconstructed subcarrier sequence according to the reconstruction subcarrier matrix, and the reconstructed sequences are inserted into the OFDM subcarrier system original data sequence, a notch is formed.
[0006] 根据本发明的方法的一个实施例，进一步的，所述计算OFDM系统与共存系统在频率重叠处的系数矩阵具体为:根据共存系统的信号特性，选择信号的采样倍数M和重构子载波的个数；对所述OFDM系统信号进行M倍采样，得到OFDM信号频谱，所述频谱为: [0006] The method according to one embodiment of the present invention embodiment, further, the computing system with OFDM systems coexist at frequency overlap coefficient matrix specifically comprises: The signal characteristics of the coexistence system, select the sampling and reconstruction of a multiple signal M the number of subcarriers; the OFDM signal is M times the sampling system to obtain an OFDM signal spectrum, the spectrum is:
II nj II nj
[0007] /(/) = —^ x(n)exp(j2fr)； [0007] / (/) =  ^ x (n) exp (j2fr);
N NM N NM
[0008] 其中，N表示OFDM系统子载波个数，x(n)为QPSK映射符号，I为采样点总数；根据所述频谱得出OFDM信号的系数矩阵P ;所述系数矩阵P为丽XN的矩阵，所述系数矩阵P中的每个元素为: [0008] where, N represents the number of subcarriers of the OFDM system, x (n) is the QPSK symbol mapping, I is the total number of sampling points; stars coefficient matrix P OFDM signal based on the spectrum; P is the matrix of coefficients Li XN matrix, said matrix coefficients for each element of P:
[0009] [0009]
[0010] 根据本发明的方法的一个实施例，进一步的，所述获取对应于各个共存系统的重构子载波矩阵、并作预存储具体为:根据各个共存系统信号所在的频率，从所述系数矩阵P中抽取该频率处的行向量形成系数子矩阵Ps ;根据共存系统信号所占带宽和重构子载波的个数，从矩阵Ps中抽取需要频谱陷波处的列向量，形成系数子矩阵Pn;使用伪逆矩阵计算方法分别计算出适应各个共存系统的重构子载波系数矩阵(PnHPn)1Pn11Ps,并做预存储处理。 [0010] The method according to one embodiment of the present invention embodiment, further, the obtaining coexistence system corresponding to each subcarrier reconstruction matrix, and prestored as specifically: the frequency of each signal is a coexistence system where, from the P coefficient matrix row vector extracted is formed at the frequency coefficient submatrix Ps; number according to the bandwidth occupied by the coexistence system and the reconstruction subcarrier signal, the spectral notch at the required extraction column vectors from the matrix Ps, the coefficients of the sub form matrix Pn; using a pseudoinverse matrix calculation method calculates the coexistence system to adapt each subcarrier reconstruction coefficient matrix  (PnHPn) 1Pn11Ps, and make a prestoring process.
[0011] 根据本发明的方法的一个实施例，进一步的，所述根据所述重构子载波矩阵计算出重构子载波序列、并将所述重构子载波序列插入所述OFDM系统的原数据序列中具体为:确定共存系统的类型，得出共存系统信号中心频率和带宽；读取适合所述共存系统的重构子载波系数矩阵；根据共存系统的中心频率，将该频率处保护带宽内的数据置零，形成重构QPSK数据序列；将重构子载波系数矩阵和重构QPSK数据序列做复数向量乘法，得到重构子载波序列；将重构子载波序列插回到原QPSK符号序列。 [0011] In accordance with one embodiment of the method of the present invention, further, the matrix according to the calculated subcarrier reconstruction reconstructed subcarrier sequence, and the reconstructed sequences are inserted into the original subcarrier OFDM system sequence data specifically includes: determining the type of coexistence system, the coexistence system derived signal center frequency and bandwidth; read subcarrier reconstruction coefficient matrix for the coexistence system; coexistence system according to the center frequency, the frequency bandwidth of the protection zero data in the form QPSK reconstructed data sequence; reconstructed coefficient matrix and the reconstructed subcarrier QPSK data sequence do complex vector multiplication, to obtain reconstructed subcarrier sequence; subcarrier sequence reconstructed back into original QPSK symbol sequence.
[0012] 根据本发明的方法的一个实施例，进一步的，重构子载波个数为2、3或4 ;M为4、 [0012] In accordance with one embodiment of the method of the present invention, further, the number of subcarriers reconstructed 2,3 or 4; M 4,
5、6、7 或8。 6, 7 or 8.
[0013] 根据本发明的方法的一个实施例，进一步的，所述共存系统为WiMax系统，中心频率为3407MHz，带宽为14MHz。 [0013] In accordance with one embodiment of the method of the present invention, further, the WiMax system is a coexistence system, the center frequency of 3407MHz, a bandwidth of 14MHz.
[0014] 本发明要解决的一个技术问题是提供一种用于OFDM系统的频谱处理装置，通过插入重构子载波数据形成OFDM频谱凹陷，避免与共存系统相互干扰。 [0014] A technical problem to be solved by the present invention is to provide a processing apparatus for a spectrum of an OFDM system, OFDM spectrum recess is formed by inserting the reconstructed data subcarrier, a coexistence system to avoid mutual interference.
[0015] 一种用于OFDM系统的频谱处理装置，包括:频率系数矩阵计算单元，用于计算OFDM系统与共存系统在频率重叠处的系数矩阵，根据所述系数矩阵获取所述OFDM系统中其它子载波旁瓣在共存频率处的功率影响；子载波计算单元，用于获取对应于各个共存系统的重构子载波矩阵，并作预存储；根据重构子载波矩阵计算出重构子载波序列；载波重构单元，用于将所述重构子载波序列插入所述OFDM系统的原数据序列中，形成陷波。 [0015] A spectral processing apparatus for an OFDM system, comprising: a frequency coefficient matrix calculation unit for calculating an OFDM system with the coexistence system matrix coefficients at a frequency overlap, the matrix obtained by the OFDM system in accordance with the other coefficients subcarrier power influence sidelobe at a frequency in the coexistence; subcarriers calculating unit, configured to obtain the coexistence system corresponding to each subcarrier reconstruction matrix, and for prestored; calculated subcarrier sequence reconstructed based on the reconstruction matrix subcarriers ; carrier reconstruction unit for the reconstruction subcarriers of the OFDM sequence is inserted in the original data sequence system, a notch is formed.
[0016] 根据本发明的装置的一个实施例，进一步的，所述频率系数矩阵计算单元根据共存系统的信号特性，选择信号的采样倍数M和重构子载波的个数；所述频率系数矩阵计算单元对所述OFDM系统信号进行M倍采样，得到OFDM信号频谱，所述频谱为: [0016] In accordance with one embodiment of the apparatus of the present invention, further, the frequency coefficient matrix calculation unit based on the signal characteristics of the coexistence system, and the selected sampling times reconstructed signal M number of subcarriers; the frequency coefficient matrix means for calculating the OFDM system signals sampled M times to obtain the OFDM signal spectrum, the spectrum is:
[0017] [0017]
[0018] 其中，N表示OFDM系统子载波个数，x(n)为QPSK映射符号，I为采样点总数；所述频率系数矩阵计算单元根据所述频谱得出OFDM信号的系数矩阵P ;所述系数矩阵P为MNXN的矩阵,所述系数矩阵P中的每个元素为: [0018] where, N represents the number of subcarriers of the OFDM system, x (n) is the QPSK symbol mapping, I is the total number of sampling points; the frequency coefficient matrix calculation unit derived coefficient matrix P OFDM signal based on the spectrum; the said coefficient matrix P is MNXN matrix, said matrix coefficients for each element of P:
[0019] [0019]
[0020] 根据本发明的装置的一个实施例，进一步的，所述子载波计算单元根据各个共存系统信号所在的频率，从所述系数矩阵P中抽取该频率处的行向量形成系数子矩阵Ps ;所述子载波计算单元根据共存系统信号所占带宽和所述重构子载波的个数，从矩阵Ps中抽取需要频谱陷波处的列向量，形成系数子矩阵Pn;所述子载波计算单元使用伪逆矩阵计算方法分别计算出适应各个共存系统的重构子载波系数矩阵(PnHPn)1Pn11Ps,并做预存储处理。 [0020] The coefficients of a submatrix Ps embodiment of the device according to the present invention, further, the subcarrier frequency of each calculation unit according to a coexistence system where the signals, the row vector extracted at a frequency formed from the coefficient matrix P, ; subcarriers signal computing unit according to the bandwidth occupied by the coexistence system and the number of the reconstruction subcarriers extracted from the matrix Ps required spectral notch at a column vector, forming the coefficient submatrix Pn; computing subcarriers calculation means calculates the pseudoinverse using an adaptation of the coexistence system each reconstructed coefficient matrix subcarriers  (PnHPn) 1Pn11Ps, and make a prestoring process.
[0021] 根据本发明的装置的一个实施例，进一步的，所述子载波计算单元确定共存系统的类型，得出共存系统信号中心频率和带宽；所述子载波计算单元读取适合共存系统的重构子载波系数矩阵；根据共存系统的中心频率，将该频率处保护带宽内的数据置零，形成重构QPSK数据序列；所述子载波计算单元将重构子载波系数矩阵和重构QPSK数据序列做复数向量乘法，得到重构子载波序列；载波重构单元将重构子载波序列插回到原QPSK符号序列。 [0021] According to one embodiment of the apparatus of the present invention, further, the computing unit determines the type of subcarriers of the coexistence system, the coexistence system derived signal center frequency and bandwidth; calculating unit reads the subcarriers for the coexistence system coefficient matrix reconstruction subcarriers; based on the center frequency of the coexistence system, the data in the guard bandwidth zero frequency, form a reconstituted QPSK data sequence; subcarriers calculation unit reconstituted coefficient matrix and the reconstructed subcarrier QPSK data sequence do complex vector multiplication, to obtain reconstructed subcarrier sequence; carrier reconstruction unit subcarrier sequence reconstructed back into original QPSK symbol sequence. [0022] 本发明的一种用于OFDM系统的频谱共存方法和频谱处理装置，通过插入重构子载波数据形成OFDM频谱凹陷，抵消其它子载波旁瓣功率，降低了系统实现的复杂度，并避免与共存系统相互干扰。 [0022] spectrum and spectrum processing means coexistence method of the present invention for an OFDM system, OFDM spectrum recess is formed by inserting the reconstructed data subcarriers, other subcarriers next offset lobe power, reducing the complexity of system implementation, and coexistence system to avoid mutual interference.
附图说明 BRIEF DESCRIPTION
[0023] 为了更清楚地说明本发明实施例或现有技术中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作一简单地介绍，显而易见地，下面描述中的附图仅仅是本发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动性的前提下，还可以根据这些附图获得其它的附图。 [0023] In order to more clearly illustrate the technical solutions in the embodiments or the prior art embodiment of the present invention, the accompanying drawings for illustrating the prior art described or needed to be used in an embodiment will be briefly introduced hereinafter, the description below the drawings are only some embodiments of the present invention, those of ordinary skill in the art is concerned, without any creative effort, and may still derive other drawings from such accompanying drawings.
[0024] 图1为根据本发明的用于OFDM系统的频谱共存方法的一个实施例的流程图； [0024] FIG. 1 is a flowchart of a method according to a spectrum for OFDM coexisting system embodiment of the present invention;
[0025] 图2为根据本发明的用于OFDM系统的频谱共存方法的另一个实施例的流程图； [0025] FIG 2 is a flowchart of another embodiment of a method for coexistence spectrum OFDM system according to the present embodiment of the invention;
[0026] 图3为在一个OFDM符号中插入重构子载波的一个实施例的不意图； [0026] FIG. 3 is inserted into the reconstructed subcarrier in one OFDM symbol in one embodiment are not intended;
[0027] 图4为根据本发明的用于OFDM系统的频谱处理装置的一个实施例的示意图。 [0027] FIG. 4 is a schematic diagram in accordance with one embodiment of apparatus for processing a spectrum of the OFDM system according to the present invention.
具体实施方式 Detailed ways
[0028] 下面参照附图对本发明进行更全面的描述，其中说明本发明的示例性实施例。 [0028] The following more fully described with reference to the accompanying drawings of the present invention, wherein the exemplary embodiments described exemplary embodiment of the present invention. 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。 Below in conjunction with the accompanying drawings of the present invention in embodiments, the technical solutions in the embodiments of the present invention are clearly and completely described, obviously, the described embodiments are merely part of embodiments of the present invention rather than all embodiments. 基于本发明中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其它实施例，都属于本发明保护的范围。 Based on the embodiments of the present invention, all other embodiments of ordinary skill in the art without any creative effort shall fall within the scope of the present invention. 下面结合各个图和实施例对本发明的技术方案进行多方面的描述。 The technical solution of the present invention will be described various aspects and embodiments below in conjunction with FIGS.
[0029] 图1为根据本发明的用于OFDM系统的频谱共存方法的一个实施例的流程图。 [0029] FIG. 1 is a flowchart according to one embodiment of coexistence method for spectrum OFDM system according to the present invention. 如图1所示:用于OFDM系统的频谱共存方法包括: 1: spectrum coexistence method for an OFDM system comprising:
[0030] 步骤102，计算OFDM系统与共存系统在频率重叠处的系数矩阵，根据系数矩阵获取OFDM系统中其它子载波旁瓣在共存频率处的功率影响。 [0030] Step 102, a coexistence system with an OFDM system is calculated in the frequency coefficient matrix overlap, the matrix effects of coexisting obtain power at a frequency near the other subcarriers in an OFDM system according flap coefficient.
[0031] 步骤103，获取对应于各个共存系统的重构子载波矩阵，并作预存储。 [0031] Step 103, the coexistence system acquired corresponding to each subcarrier reconstruction matrix, and for prestored.
[0032] 步骤104，根据重构子载波矩阵计算重构子载波序列，并将重构子载波序列插入OFDM系统的原数据序列中，形成陷波。 [0032] Step 104, the reconstructed subcarrier is calculated according to the matrix sequence reconstruction subcarriers, and the reconstruction subcarrier OFDM system the original sequence is inserted in the data sequence, a notch is formed.
[0033] 根据本发明的一个实施例，根据共存系统的信号特性，选择信号的采样倍数M和重构子载波的个数；对OFDM系统信号进行M倍采样，得到OFDM信号频谱，频谱为: [0033] According to an embodiment of the present invention, in accordance with signal characteristics coexistence system, select the sampling signal and the reconstructed multiple M of the number of subcarriers; OFDM system signal is sampled M times to obtain the OFDM signal spectrum, the spectrum is:
[0034] [0034]
[0035] 其中，N表示OFDM系统子载波个数，χ (η)为QPSK映射符号，I为采样点总数；根据频谱得出OFDM信号的系数矩阵P ;系数矩阵P为丽XN的矩阵,系数矩阵P中的每个元素为: [0035] where, N represents the number of subcarriers of the OFDM system, χ (η) of QPSK symbols are mapped, I is the total number of sampling points; OFDM signal based on the spectrum obtained coefficient matrix P; P is a coefficient matrix Korea XN matrix coefficients each element in the matrix P is:
[0036] [0036]
[0037] 根据本发明的一个实施例，根据各个共存系统信号所在的频率，从系数矩阵P中抽取该频率处的行向量形成系数子矩阵Ps ;根据共存系统信号所占带宽和重构子载波的个数，从矩阵Ps中抽取需要频谱陷波处的列向量，形成系数子矩阵Pn ;使用伪逆矩阵计算方法分别计算出适应各个共存系统的重构子载波系数矩阵(PnHPn)_lPnHPs，并做预存储处理。 [0037] According to one embodiment of the present invention, the frequency of each signal where the coexistence system, the row vector extracted frequency coefficient submatrix formed from the coefficient matrix P, Ps; a coexistence system according to the bandwidth occupied by the signal and the reconstruction subcarriers number extracted from the matrix Ps required spectral notch at a column vector of the wave form submatrix coefficients Pn; using a pseudoinverse matrix calculation method calculates the coexistence system to adapt each subcarrier reconstruction coefficient matrix  (PnHPn) _lPnHPs, and do a prestorage processing.
[0038] 确定共存系统的类型，得出共存系统信号中心频率和带宽；读取适合共存系统的重构子载波系数矩阵；根据共存系统的中心频率，将该频率处保护带宽内的数据置零，形成重构QPSK (Quadrature Phase Shift Keying:正交相移键控)数据序列；将重构子载波系数矩阵和重构QPSK数据序列做复数向量乘法，得到重构子载波序列；将重构子载波序列插回到原QPSK符号序列。 [0038] determine the type of coexistence system, the coexistence system derived signal center frequency and bandwidth; read subcarrier reconstruction matrix of coefficients for the coexistence system; coexistence system according to the center frequency, the bandwidth of the frequency at the protection is zeroed , form a reconstituted QPSK (quadrature phase shift keying: quadrature phase shift keying) data sequence; reconstructed coefficient matrix and the reconstructed subcarrier QPSK data sequence do complex vector multiplication, to obtain reconstructed subcarrier sequence; the reconstruction sub QPSK carrier sequence back into the original symbol sequence.
[0039] 图2为根据本发明的用于OFDM系统的频谱共存方法的另一个实施例的流程图。 [0039] FIG 2 is a flowchart of another embodiment of a method for coexistence spectrum OFDM system according to the present invention. 通过计算与共存系统频率重叠处的系数矩阵来得到OFDM系统中其它子载波旁瓣在共存频率处的功率影响，根据共存系统的信号带宽特性设计抵消子载波序列，能够在子载波数据置空的基础抵消其它OFDM子载波旁瓣的影响，加深频谱凹陷的保护深度。 By calculating the coexistence system frequency coefficient matrix overlap to obtain the other power impact subcarriers sidelobes coexisting frequency OFDM system, in accordance with the signal bandwidth characteristics coexistence system design offset subcarrier sequence, can be null subcarrier data set of basis to offset the impact of OFDM subcarriers other side flap, protection deepen the depth of the depression spectrum. 根据不同共存系统预计算并存储的重构子载波的系数矩阵，根据共存系统判定结果动态计算得出重构子载波插入OFDM传输数据序列，以起到抵消其它子载波旁瓣功率，降低了系统实现的复杂度。 Depending on the system operator is expected to coexist and stored reconstructed coefficient matrix subcarriers, calculated results of the dynamic system reconstruction subcarrier is determined according to the coexistence of the OFDM transmission data sequence is inserted, to function as offset side lobe power of the other subcarriers, reducing system complexity of implementation.
[0040] 本发明的方法根据系统信号的采样系数矩阵得出影响频谱陷波深度的因素，设计并插入重构子载波序列以加深保护陷波深度，并使用预处理降低系统实现复杂度。 [0040] The method of the present invention, the influence derived from the sampled signal spectrum coefficient matrix system notch depth of factors, designed and inserted into the reconstructed subcarrier sequence to enhance protection notch depth, and the use of the pretreatment system to reduce implementation complexity. 如图2所示，用于OFDM系统的频谱共存方法包括下列步骤: As shown, the spectrum coexistence method for OFDM system 2 comprises the steps of:
[0041] 步骤201，针对共存的系统的信号特性选择信号的采样倍数M和插入子载波的个数。 [0041] Step 201, the select signal sampling times M subcarriers and inserting the coexistence signal characteristics for a number of systems. 根据一个实施例，Me [4，8]，如共存系统需要较深的陷波保护深度，则可适当调整M的数值。 According to one embodiment, Me [4,8], such as the system needs to coexist protection deep notch depth, the value of M can be appropriately adjusted. 插入重构新子载波个数在2至4个之间。 Insert new reconstructed subcarrier number between 24.
[0042] 步骤202，对OFDM系统信号进行M倍采样，得到OFDM信号频谱，根据频谱，其数学表达式为: [0042] Step 202, the OFDM signal is M times the sampling system to obtain an OFDM signal spectrum, according to the spectrum, mathematical expression is:
[0043] [0043]
[0044] 其中N表示OFDM系统子载波个数，χ (η)为QPSK映射符号，I为采样点总数。 [0044] wherein N represents the number of subcarriers of the OFDM system, χ (η) of QPSK symbols are mapped, I is the total number of sampling points. 根据频谱取得，OFDM信号的系数矩阵P，P是一个MNXN大小的矩阵，矩阵的每个元素为: The spectral acquisition, the coefficient matrix of OFDM signals P, P is the size of each element MNXN a matrix, the matrix is:
[0045] [0045]
[0046] 步骤203，根据共存系统信号所在的频率，从系数矩阵P中抽取该频率处的行向量形成系数子矩阵Ps。 [0046] Step 203, the frequency where the signal is a coexistence system, the row vector extracted frequency coefficient submatrix formed from the coefficient matrix P, Ps.
[0047] 步骤204，根据共存系统信号所占带宽和插入重构子载波的个数，从矩阵匕中抽取需要频谱陷波处的列向量形成系数子矩阵pn。 [0047] Step 204, the coexistence system according to the bandwidth occupied by the signal and inserting the reconstructed subcarrier number, dagger extracted from the matrix column vector required spectral notch is formed at the wave coefficient submatrix pn.
[0048] 步骤205，使用伪逆矩阵计算方法分别计算出适应各共存系统的重构子载波系数矩阵(P1Xr1PnHPstj [0048] Step 205, the pseudoinverse matrix calculation method were calculated for each adaptation coexistence system subcarrier reconstruction coefficient matrix  (P1Xr1PnHPstj
[0049] 步骤206，做预存储处理。 [0049] Step 206, process to make prestored.
[0050] 步骤207，根据频谱感知确定共存系统的类型， [0050] Step 207, determined according to the type of spectrum sensing coexistence system,
[0051] 步骤208，得出共存系统信号中心频率和带宽。 [0051] Step 208, the coexistence system derived signal center frequency and bandwidth. 根据一个实施例，当前共存系统为WiMax系统，中心频率为3407MHz，带宽为14MHz。 According to one embodiment, the current system is a coexistence WiMax system, the center frequency of 3407MHz, a bandwidth of 14MHz.
[0052] 步骤209，自动使用选择开关读取适合共存系统的重构子载波系数矩阵。 [0052] Step 209, the read select switch automatically used for the coexistence system subcarrier reconstruction coefficient matrix.
[0053] 步骤210，根据共存系统的中心频率，将该频率处保护带宽内的数据置零，形成重构QPSK数据序列。 [0053] Step 210, based on the center frequency of the coexistence system, the frequency of the data protection within the bandwidth of zero, form a reconstructed QPSK data sequence.
[0054] 步骤211，将重构子载波系数矩阵和重构QPSK数据序列做复数向量乘法，得到重构子载波序列。 [0054] Step 211, the reconstructed coefficient matrix and the reconstructed subcarrier QPSK data sequence do complex vector multiplication, to obtain reconstructed subcarrier sequence.
[0055] 步骤212，将重构子载波序列插回到原QPSK符号序列，以起到抵消其它子载波旁瓣功率，加深陷波，保护共存系统的目的。 [0055] Step 212, the reconstructed subcarrier QPSK symbol sequence inserted back into the original sequence, serve the purpose to counteract the side lobe power of the other subcarriers, plus deep notch, the coexistence system protection.
[0056] 通过对OFDM信号频谱采样获取系数矩阵，可以计算得出需要形成陷波的频段中，对数据置零后其它子载波在此区域的残留功率影响。 [0056] By sampling the OFDM signal acquired spectral coefficient matrix can be calculated in the frequency required to form a notch, the influence of the residual power of the data on other subcarriers in this region is zero. 以此为依据设计新的重构子载波插入，以重构子载波功率抵消其它子载波在影响，达到加深陷波的效果。 As a basis for the design of new reconstruction insert subcarriers, subcarrier power to reconstruct offset the impact of other subcarriers, to the effect plus deep wave.
[0057] 经运算推导，系数子矩阵Pn中的元素仅与干扰处的子载波个数和采样倍数M有关，即在采样倍数M和插入重构子载波的个数确定情况下，系数子矩阵Pn的值与受干扰的载波个数有关，而与受干扰的载波位置无关。 [0057] derived by the calculation, the coefficient submatrix Pn only the elements and the number of subcarriers at sampling times M about the interference, i.e., the case of determining the sampling times M and the number of subcarriers is inserted reconstructed coefficient submatrix the value of Pn and the number of carriers related to disturbed, irrespective of the position of the interfered carriers. 因此可以预先对伪逆矩阵求逆的(PnHPn)1Pn11运算做预处理。 Can be preinversion of a pseudo inverse matrix  (PnHPn) 1Pn11 preprocessing operation.
[0058] OFDM系统与已知无线通信系统共存，该无线通信系统信号的中心频率和带宽均为已知参数。 [0058] OFDM system with known wireless communication systems coexist, center frequency and bandwidth of the wireless communication system signal parameters are known. 在通过频谱感知确定受干扰的共存系统后，可以得出需要频谱凹陷的频率范围，继而可确定系数子矩阵Ps，因此重构子载波系数矩阵(PnHPn)1Pn11Ps可根据不同共存系统的信号特性预处理并存储备用。 After determining the coexistence system by spectrum sensing interfered, the recess can be drawn need spectrum frequency range, in turn, may determine the coefficient Ps of submatrix, and therefore subcarrier reconstruction coefficient matrix  (PnHPn) 1Pn11Ps signal may be different based on the coexistence system pretreatment characteristics and storage backup.
[0059] 根据本发明的一个实施例，原OFDM系统QPSK子载波数据序列为X = [X(0)，…X(N) ]T，其中N为OFDM系统子载波总数，根据共存系统的中心频率，判断干扰所在位置与OFDM系统(a, b)号子载波重合，将[X(a2)，…X(Nb+2)]T的QPSK调制数据置零，形成重构QPSK数据序列g ;将重构子载波系数矩阵(Pn11Pn)In11Ps和重构QPSK数据序列g做复数向量乘法，得到重构子载波序列h，h=_(Pn11Pn)4Pn11Ps • g。 [0059] According to the Centers a embodiment of the present invention, the original OFDM systems QPSK subcarrier data sequence is X = [X (0), ... X (N)] T, where N is the total number of subcarrier OFDM system, in accordance with coexistence system frequency, the interference is determined the location of the OFDM system (a, b) number of subcarriers overlap, the [X (a2), ... X (Nb + 2)] QPSK modulated data T is zero, form a reconstructed QPSK data sequence g; reconstituted coefficient matrix subcarriers  (Pn11Pn) In11Ps QPSK data and the reconstructed sequence g do complex vector multiplication, to obtain reconstructed subcarrier sequence h, h = _ (Pn11Pn) 4Pn11Ps • g. 将重构子载波序列h插回到原QPSK符号序列。 The reconstruction subcarriers back into the original sequence of the h QPSK symbol sequence.
[0060] 根据本发明的一个实施例，给出在一个具体OFDM配置下，与WiMax系统共存时的实际应用的例子，需要说明的是:本例中的参数并不影响本专利的一般性。 [0060] According to one embodiment of the present invention, is given in a particular OFDM configuration, examples of practical application when coexistence with WiMax system, should be noted that: in the present embodiment not affect the general parameters of this patent.
[0061] 设OFDM系统有效符号长度N=128。 [0061] OFDM system provided effective symbol length N = 128. 首先选取采样倍数M=4，对频谱做4倍的采样得到系数矩阵P，P为512X 128的矩阵。 First, select the sampling times M = 4, the frequency spectrum of the sampled four times to make the coefficient matrix P, P is a 512X 128 matrix. 针对中心频率3407MHz的WiMax系统，其14MHz信号带宽可由3个OFDM子载波及2个重构子载波形成陷波保护，从系数矩阵P中抽取系数子矩阵Ps和Pn，其中Ps为9 X 128矩阵，Pn为9 X 5矩阵，计算得到重构子载波系数矩阵A，A为5 X 128的矩阵，对A进行预存储处理。 For a center frequency of 3407MHz WiMax system, which may be three 14MHz signal bandwidth and OFDM subcarriers are formed two reconstructed subcarrier trap protection, decimation factor, submatrices Ps and Pn from the coefficient matrix P in which the matrix Ps is a 9 X 128 , Pn is 9 X 5 matrix, the calculated coefficient matrix a reconstruction subcarriers, 5 X 128 a is a matrix of prestored a process.
[0062] 实时检测到共存WiMax系统，将原QPSK序列中需要陷波频率处的数据置零，形成128X1的序列g。 [0062] Realtime detection of coexistence WiMax system, the original sequence QPSK data needs to notch at the zero frequency of the wave form sequence of g 128X1. 读取重构子载波系数矩阵A，计算h=AXg，h即为5X1的重构子载波序列。 Reconstruction of the subcarrier read coefficient matrix A, calculating h = AXg, h is the reconstruction of the 5X1 subcarrier sequence. 将h插入到原QPSK需陷波的频率处，完成对WiMax系统的陷波保护，达到系统共存效果O The required frequency h is inserted into the notch of the original QPSK, complete protection of the notch WiMax system, the system to achieve the effects of the coexistence O
[0063] 图3为在一个OFDM符号中插入重构子载波的一个实施例的不意图。 [0063] FIG. 3 is inserted into the reconstructed subcarrier in one OFDM symbol in one embodiment is not intended. I代表插入的重构子载波；2表示子载波数据不被置零的区域；3表示子载波数据置零的区域，即需要形成陷波保护共存系统的频率范围。 I represents the reconstructed subcarrier is inserted; 2 denotes a subcarrier data area is not set to zero; 3 represents a region of the subcarrier data to zero, i.e., the frequency range necessary to form a notch protection coexistence system.
[0064] 图4为根据本发明的用于OFDM系统的频谱处理装置的一个实施例的示意图用于OFDM系统的频谱处理装置41，包括:频率系数矩阵计算单元411、子载波计算单元412和载波重构单元413。 [0064] FIG. 4 is a spectrum processing means 41 OFDM system diagram of one embodiment of apparatus for processing a spectrum of the OFDM system according to the present invention, comprising: a frequency coefficient matrix calculation unit 411, calculation unit 412 and the subcarrier Carrier reconstruction unit 413. 频率系数矩阵计算单元411计算OFDM系统与共存系统在频率重叠处的系数矩阵，根据系数矩阵获取OFDM系统中其它子载波旁瓣在共存频率处的功率影响。 Frequency coefficient matrix calculation unit 411 calculates a system matrix OFDM system coexist with the coefficient at the frequency overlap, the power at the frequency of side effects of coexisting systems other OFDM subcarriers coefficient matrix obtained according flap. 子载波计算单元412获取对应于各个共存系统的重构子载波矩阵，并作预存储。 Calculating unit 412 acquires subcarriers corresponding to the respective subcarrier reconstruction coexistence system matrix, and for prestored. 根据重构子载波矩阵计算出重构子载波序列。 Reconstruction of subcarrier sequence is calculated according to the subcarrier reconstruction matrix. 载波重构单元413将重构子载波序列插入OFDM系统的原数据序列中，形成陷波。 Reconstruction of the reconstructed carrier unit 413 OFDM subcarrier sequence inserted into the original data sequence system, a notch is formed.
[0065] 根据本发明的一个实施例，频率系数矩阵计算单元411根据共存系统的信号特性，选择信号的采样倍数M和重构子载波的个数；频率系数矩阵计算单元411对OFDM系统信号进行M倍采样，得到OFDM信号频谱，频谱为: [0065] According to one embodiment of the present invention, a frequency coefficient matrix calculating unit 411 according to the signal characteristics of the coexistence system and choose a multiple of the number of samples M and the reconstruction subcarrier signal; a frequency coefficient matrix calculation unit 411 the OFDM system signals M times the sampling, to obtain an OFDM signal spectrum, the spectrum is:
[0067] 其中，N表示OFDM系统子载波个数，χ(η)为QPSK映射符号，I为采样点总数；频率系数矩阵计算单元411根据频谱得出OFDM信号的系数矩阵P ;系数矩阵P为MNXN的矩阵，系数矩阵P中的每个元素为: [0067] where, N represents the number of subcarriers of the OFDM system, χ (η) of QPSK symbols are mapped, I is the total number of sampling points; frequency coefficient matrix calculating unit 411 OFDM signal based on the spectrum obtained coefficient matrix P; P is a coefficient matrix MNXN matrix, each coefficient matrix P elements:
[0068] [0068]
O O
[0069] 根据本发明的一个实施例，子载波计算单元412根据各个共存系统信号所在的频率，从系数矩阵P中抽取该频率处的行向量形成系数子矩阵Ps ;子载波计算单元412根据共存系统信号所占带宽和重构子载波的个数，从矩阵Ps中抽取需要频谱陷波处的列向量，形成系数子矩阵Pn ;子载波计算单元412使用伪逆矩阵计算方法分别计算出适应各个共存系统的重构子载波系数矩阵(Pn11Pn)1Pn11Ps,并做预存储处理。 [0069] According to one embodiment of the present invention, subcarriers calculating unit 412 according to the frequency of the respective coexistence system signal where the extracted row vector at the frequency formed coefficient submatrix Ps from the coefficient matrix P; and subcarriers calculating unit 412 according to coexist occupied bandwidth and the number of signal reconstruction subcarrier system, need to be extracted from the matrix Ps spectral notch at a column vector of the wave form submatrix coefficients Pn; subcarriers calculation unit 412 using the pseudoinverse matrix calculation method adapted to calculate the respective Reconstruction subcarrier coefficient matrix of the system coexist  (Pn11Pn) 1Pn11Ps, and make a prestoring process.
[0070] 根据本发明的一个实施例，子载波计算单元412确定共存系统的类型，得出共存系统信号中心频率和带宽；子载波计算单元412读取适合共存系统的重构子载波系数矩阵；根据共存系统的中心频率，将该频率处保护带宽内的数据置零，形成重构QPSK数据序列；子载波计算单元412将重构子载波系数矩阵和重构QPSK数据序列做复数向量乘法，得到重构子载波序列；载波重构单元413将重构子载波序列插回到原QPSK符号序列。 [0070] According to an embodiment of the present invention, subcarriers calculation unit 412 determines the type of coexistence system, the coexistence system derived signal center frequency and bandwidth; calculating unit 412 reads the subcarriers for the coexistence system subcarrier reconstruction coefficient matrix; the center frequency of the coexistence system, the data in the guard bandwidth zero frequency, form a reconstituted QPSK data sequence; subcarriers calculation unit 412 the reconstructed coefficient matrix and the reconstructed subcarrier QPSK data sequence do complex vector multiplication, to give Reconstruction of subcarrier sequence; carrier reconstruction unit 413 subcarrier sequence reconstructed back into original QPSK symbol sequence.
[0071] 本发明的方法和装置根据共存系统的保护要求，对OFDM系统信号进行指定倍数的采样，获取信号的系数矩阵，抽取与共存系统频率重叠处的矩阵行、列，形成干扰系数矩阵，根据系数矩阵计算其余子载波旁瓣对该处的功率影响值。 [0071] The method and apparatus of the invention according to the protection requirements of the coexistence system, the OFDM system, the signal is sampled the specified multiple of obtaining the coefficient matrix signal, the matrix rowsystem frequency overlap at the extraction and coexistence, columns, interfere coefficient matrix, Effect of the value of the power at the side lobe is calculated according to the remaining subcarriers coefficient matrix. 依照计算干扰系数矩阵得出的功率影响值重新设计子载波数据序列，使序列能够抵消其它子载波旁瓣的功率影响。 Calculated in accordance with the interference influence coefficient matrix obtained power value redesign subcarrier data sequence, the sequence can be canceled so that the other subcarriers power impact next lobe. 根据共存系统信号特性，对适用于不同系统的重构子载波系数矩阵进行预计算和预存储。 The coexistence system signal characteristic of the system for different subcarrier reconstruction coefficient matrix precomputed and prestored. 根据共存系统判定结果，使用选择开关动态的调用预存储的重构子载波系数矩阵运算重构子载波，并插入到OFDM传输数据序列中，以起到抵消其它子载波旁瓣功率，加深陷波，保护共存系统的目的。 According to the determination result of the coexistence system using dynamic selection switch calling prestored coefficient matrix operation reconstructed subcarrier reconstruction subcarriers, and inserted into the OFDM transmission data stream, in order to play the other subcarriers sidelobe canceling power, plus deep wave, coexistence system protection purposes. [0072] 可能以许多方式来实现本发明的方法和系统。 [0072] The method and system may be implemented in many ways according to the present invention. 例如，可通过软件、硬件、固件或者软件、硬件、固件的任何组合来实现本发明的方法和系统。 For example, the method and system may be implemented according to the present invention by any combination of software, hardware, firmware or software, hardware, firmware. 用于方法的步骤的上述顺序仅是为了进行说明，本发明的方法的步骤不限于以上具体描述的顺序，除非以其它方式特别说明。 For the abovedescribed sequence of steps of the method are merely intended to be illustrative of the steps of the method according to the present invention is not limited to that specifically described above, unless specifically stated otherwise. 此外，在一些实施例中，还可将本发明实施为记录在记录介质中的程序，这些程序包括用于实现根据本发明的方法的机器可读指令。 Further, in some embodiments, the present invention may also be implemented as a program recorded in a recording medium, the program comprising machine readable instructions for implementing the method according to the present invention. 因而，本发明还覆盖存储用于执行根据本发明的方法的程序的记录介质。 Accordingly, the present invention also covers a recording medium storing a program according to the implementation of the method according to the present invention.
[0073] 本发明的描述是为了示例和描述起见而给出的，而并不是无遗漏的或者将本发明限于所公开的形式。 [0073] The present invention is described for sake of illustration and description is given, but not exhaustive or to limit the invention to the form disclosed. 很多修改和变化对于本领域的普通技术人员而言是显然的。 Many modifications and variations to those of ordinary skill in the art is obvious. 选择和描述实施例是为了更好说明本发明的原理和实际应用，并且使本领域的普通技术人员能够理解本发明从而设计适于特定用途的带有各种修改的各种实施例。 The embodiments were chosen and described in order to best explain the principles and practical applications of the present invention and enable one of ordinary skill in the art to understand the invention for various design suited to the particular use with a variety of modified embodiments.
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HIROHISA YAMAGUCHI: "Active interference cancellation technique for MBOFDM cognitive radio", 《EUROPEAN MICROWAVE CONFRERENCE》 * 
钱逸群: "MBOFDM主动干扰消除（AIC）研究与硬件实现", 《中国优秀硕士学位论文全文数据库 信息科技辑》 * 
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