CN101414869B - Star-loading reconstruction wideband digital channel exchange method - Google Patents

Star-loading reconstruction wideband digital channel exchange method Download PDF

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CN101414869B
CN101414869B CN 200810238889 CN200810238889A CN101414869B CN 101414869 B CN101414869 B CN 101414869B CN 200810238889 CN200810238889 CN 200810238889 CN 200810238889 A CN200810238889 A CN 200810238889A CN 101414869 B CN101414869 B CN 101414869B
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satellite
method
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perfect reconstruction
exchange
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CN101414869A (en
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周坡
晏坚
曹志刚
阳志明
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清华大学
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Abstract

The invention relates to a satellite-borne reconfigurable broadband digital channelizing switching method, belonging to the technical field of satellite communication. The method comprises the following steps of: carrying out secondary sampling to uplink signals of the satellite so as to obtain digital signals; constructing perfect reconfigurable prototype filtering module and obtain a complex-exponential modulation perfect reconfigurable filter group module by complex-exponential modulation; carrying out filtering to the secondary sampling signals so as to obtain baseband signals of subchannels; carrying switching to the separated baseband signals of the subchannels according to switching information set by the satellite so as to obtain switched data; carrying combination to the switcheddata so as to obtain the downlink signals of the satellite. The method is not independent physical layer concrete setting, is not relevant to the wave form of the signals to be processed, and has good adaptability; the method is suitable for uniform bandwidth channel switching scenes and is also suitable for non-uniform bandwidth channel switching scenes; all the control is realized by control signaling with flexible reconfigurability; and the method supports functions of broadcast and multicast simultaneously.

Description

一种星载可重构宽带数字信道化交换方法 A satellite-reconfigurable digital wideband channelization exchange method

技术领域 FIELD

[0001] 本发明涉及一种星载可重构宽带数字信道化交换方法,属于卫星通信技术领域。 [0001] The present invention relates to an onboard reconfigurable wideband digital channelization exchange method, belonging to the technical field of satellite communications. 背景技术 Background technique

[0002] 随着科技的发展,通信卫星的复杂度与日剧增,具有多任务、多波束、多频段以及多信道规划的特点,这必将要求卫星有效载荷具有非常高的在轨灵活性(或者说柔性),才能尽可能地减少系统的各种运营限制,从而充分发挥卫星的价值。 [0002] As the complexity of Japanese development, communications satellite technology surge, with multi-tasking, multi-beam, multi-band and multi-channel programming features, which will have a satellite payload requires a very high flexibility in orbit (or flexible), in order to reduce as much as possible a variety of operating system limitations, to maximize the value of the satellite.

[0003] 通信卫星的核心功能是要完成信息的中继,从这个意义上来说,卫星有效载荷的设计将朝以下两个方向发展,即透明转发卫星有效载荷和星上再生卫星有效载荷。 Core Function [0003] Communication satellites relay information is to be completed, in this sense, the design of the satellite payload moving in two directions, i.e., on a transparent satellite transponder satellite payload regeneration and the satellite payload. 随着人们对灵活性的需求与日俱增,具有透明转发功能的卫星有效载荷的研发又重新受到青睐, 主要原因是:对于具有星上再生功能的卫星,一方面其设备复杂度相比透明转发卫星的设备复杂度要高,另一方面它与物理层(如信号的调制方式、编码方式等)紧密相关,其灵活性不是很高,从某种意义上讲,随着数字通信技术的不断发展,可能使得“再生转发”中已有的技术和平台过时,进而使系统报废;而透明转发相对简单,且与各种通信协议的兼容性好,但为了支持灵活路由以及跨频段、跨波束的交链和交换,传统的透明转发不能满足发展的需求,必须要开发具有较强星上处理能力的透明转发卫星。 As people's increasing demand for flexibility, have developed transparent forwarding of satellite payloads again favored, mainly due to: For a satellite on the regeneration of, on the one hand that the complexity of the device compared to the transparent transponder satellite device complexity is high, on the other hand it is closely related to the physical layer (e.g., signal modulation, coding, etc.), its flexibility is not very high, in a sense, with the development of digital communication techniques, It may be such that "forward reproduction" in the prior art and the platform obsolete scrap and thus make the system; forwarding relatively simple and transparent, and good compatibility with various communication protocols, but to support routing flexibility and cross-band, across the cross-beam chain and exchange of traditional transparent forwarding can not meet the needs of development, we must develop a strong star transparent forwarding processing power satellites.

[0004] 近年来,人们运用下一代通信卫星设计技术不断开发经济有效的全球宽带多媒体通信系统,且大多数采用多波束频分多址(以下简称FDMA)通信体制。 [0004] In recent years, the use of next-generation communications satellite design technologies continue to develop cost-effective global broadband multimedia communication systems, and in most cases, multi-beam frequency division multiple access (hereinafter referred to as FDMA) communication system. 在这种体制下,每个上行用户占用上行信道中一定带宽的子信道,用户子信道在星上经过带通滤波被提取出来,然后经电路交换组成下行波束。 In this system, each uplink channel occupies a certain user uplink bandwidth subchannels, subchannel band pass filtered user is extracted in the star, and then via the circuit switched composition downlink beam. 在宽带卫星应用中,这种交换处理采用数字化方法,称为数字信道化交换方法,它的主要功能是实现灵活的信道化、频率转换、路由以及信道均衡等。 In broadband satellite applications, this exchange using digital processing method, referred to as digital channelization exchange method, its main function is to achieve a flexible channelization, frequency conversion, routing, and channel equalization. 可见数字信道化交换技术正好适应未来通信卫星的发展形势,将具有广阔的应用前景。 Visible Digital Channel switching technology just adapt to the future development of the situation of communication satellites, will have broad application prospects.

[0005] 目前,星载转发要求:子信道复用数较高,且子信道带宽和保护带宽可任意配置。 [0005] Currently, spaceborne forwarding requirements: the higher the number of multiplexed subchannels, and subchannel bandwidth and protection bandwidth can be any configuration. 现有常用的数字信道化方法或多或少有些局限:解析信号法要求所有待处理的子信道具有相同的带宽;数字下变频法要求子信道复用数少(一般为4〜8);频域滤波法需动态加载不同点数的快速傅立叶变换和快速逆傅立叶变换模块,对存储的要求高;树状法要求子信道复用数N与使用滤波和抽取结构的级数L间存在关系N =浐;多相离散DFT法通常要求所有子信道的带宽相同,且子信道之间的保护带宽相同;离散滤波器组法在子信道复用数大的情况下,计算量和存储量非常大。 Existing common digital channelization method is more or less confined to: analytical signal to be processed requires all subchannels have the same bandwidth; subchannel frequency multiplexing method requires a small number of digital (typically 4 to 8); Frequency domain filtering method need dynamically loading different points of the fast Fourier transform and an inverse fast Fourier transform module, a high storage requirements; tree method in claim there is a relationship between the number of stages N L N number of subchannels using the filtering and decimation multiplexing structure = Chan; polyphase DFT discrete method generally requires the same bandwidth for all subchannels, and the same protective bandwidth between sub-channels; method discrete filter set at a large number of multiplexed subchannels, the amount of computation and memory is very large.

发明内容 SUMMARY

[0006] 本发明的目的是提出一种星载可重构宽带数字信道化交换方法,针对已有技术的不足之处,采用复指数调制完美重构滤波的原理,对卫星通信中的星地上行和下行信号直接滤波和综合,分别得到可分离的子带信号和合成的星地下行信号,以实现数字信道化交换。 [0006] The object of the present invention is to provide a wideband digital spaceborne reconfigurable channelization exchange method for the deficiencies of the prior art, using the principle of complex exponential modulated perfect reconstruction filter, the star of the satellite communication earth uplink and downlink signals are directly filtered and summed, respectively separable sub-band satellite ground line signals and synthesized signal, to realize the exchange of digital channels.

[0007] 本发明提出的星载可重构宽带数字信道化交换方法,包括以下步骤:[0008] (1)对星地上行信号进行二次采样,得到等效基本子信道数Ve为2的次幂的并与一次采样信号具有不同采样率的数字信号; [0007] The present invention is proposed wideband digital onboard reconfigurable channelization exchange method, comprising the steps of: [0008] (1) on the satellite signal ground line subsampling to obtain substantially equivalent to the number of subchannels Ve 2 and the power of a digital signal sampled signal having different sampling rates;

[0009] (2)根据上述二次采样信号的频谱,用二通道无损网格方法,构建一个完美重构原型滤波模块,对完美重构原型滤波模块进行复指数调制,得到一个复指数调制完美重构滤波器组模块; [0009] (2) the spectrum of the secondary signal sampling, non-destructive method for two-channel grid, construct a perfect reconstruction filter module prototype, perfect reconstruction of the prototype filter module complex exponential modulated, to obtain a perfect complex exponential modulated reconstruction filter banks module;

[0010] (3)用上述复指数调制完美重构滤波器组模块中的分析滤波部分对上述二次采样信号进行滤波,得到分离的子信道基带信号; [0010] (3) With the above complex exponential modulated analysis filter section perfect reconstruction filter bank module for sampling the secondary signal is filtered to give the sub-channel baseband signal separation;

[0011] (4)根据卫星设定的交换信息,对上述分离的子信道基带信号进行交换,得到交换后的数据; [0011] (4) The exchange of information set in the satellite, said separated sub-channel baseband signal exchange, the exchange of data is obtained;

[0012] (5)用上述复指数调制完美重构滤波器组模块中的综合滤波部分对上述交换后的数据进行综合,得到一个星地下行信号。 [0012] (5) With the above complex exponential modulated synthesis filtering section perfect reconstruction filter bank module for the exchange of data integrated to obtain a signal line underground star.

[0013] 上述方法中,构建完美重构原型滤波模块的充分必要条件是完美重构原型滤波模块的多相分量对Bk(Z)和BM+k(z)满足如下两种关系 Necessary and Sufficient Conditions [0013] In the above method, a prototype constructed perfect reconstruction filter module is perfect reconstruction polyphase components of the prototype filter module Bk (Z) and BM + k (z) satisfy the following two relationships

[0014] [0014]

[0015] [0015]

Figure CN101414869BD00041

[0016] 其中,(1)中的θ为迭代过程中的形式参数,(2)中的m为任意大于等于1的整数,M为最大抽取或内插因子,其取值由子信道间的最小保护带宽Gmin确定,即 [0016] wherein, (1) in the form of parameter θ is an iterative process, (2), m is any integer greater than 1, M being the maximum decimation or interpolation factor within which the smallest value among the subchannels protection bandwidth Gmin to determine that the

[0017] [0017]

Figure CN101414869BD00042

[0018] 上述方法中,复指数调制完美重构滤波器组模块的通道数可以为2M。 The number of channels [0018] In the above method, the complex exponential modulated perfect reconstruction filter bank module may be 2M.

[0019] 上述方法中,复指数调制完美重构滤波器组模块中各分析滤波部分的冲击响应与对应的综合滤波部分的冲击响应相同。 [0019] In the above method, the complex-exponential modulated perfect reconstruction impact impulse responses corresponding to the synthesis filter portion of each analysis filter bank filtering section in response to the same module.

[0020] 本发明提出的星载可重构宽带数字信道化交换方法,其特点和优点是: [0020] The present invention is proposed wideband digital onboard reconfigurable channelization exchange methods, features and advantages which are:

[0021] 1、与传统的透明转发技术相比,本发明方法具有一定程度的灵活的星上处理能力。 [0021] 1, compared with the conventional transparent forwarding technology, the method of the present invention on a flexible satellite processing power has a certain degree. 从交换的角度来看,传统的透明转发主要采用微波交换矩阵进行交换,这种方法完全依赖于射频载波的变换,通常适合于不同波束之间的交换。 From the switching point of view, the conventional microwave transparent transponder main exchange switching matrix, it is completely dependent on the conversion of the RF carrier, typically adapted to exchange between different beams. 本发明的数字信道化交换方法从基带角度直接针对不同的业务信道以及所对应的业务终端本身来进行,交换粒度更小。 Digital Channel switching method of the present invention to direct itself for different traffic channels and the corresponding service from the base angled terminal, the switching granularity is smaller. 此外,运用数字信道化交换技术后,卫星通信系统中的业务信道可以实现跨频段交换,如X频段与Ka频段之间的交换,不同频段终端之间的互通更加灵活。 In addition, the use of digital channelization switching technology, a traffic channel may be a satellite communication system to achieve cross-band exchange, the exchange between the interworking between the X-band and Ka-band, different frequency terminals are more flexible.

[0022] 2、与现有的再生转发技术相比,本发明的方法具有良好的适应能力。 [0022] 2, the prior art reproduction forward compared to the method of the present invention have good adaptability. 从交换的角度来看,再生转发(如ATM交换或IP交换)需要进行解调、译码、交换、编码、调制等处理过程,增加了星上的有效载荷以及整个系统的复杂性,也就是说,再生转发紧密依赖于物理层的设置,随着数字通信技术的不断发展,可能使得“再生转发”中已有的技术和平台过时,进而使系统报废。 From the switching point of view, forward reproduction (such as ATM or IP switching exchange) required to demodulate, decode, exchange, encoding, modulation process and the like, increasing the effective load on the satellite and the complexity of the overall system, i.e. said forward reproduction closely dependent on the physical layer is provided, with the development of digital communication technology, such may be "forward reproduction" in the prior art and the platform obsolete, thereby enabling the system scrapped. 而本发明的方法对物理层的依赖甚微,根本不需要进行调制解调和编译码等过程,因此卫星有效载荷的复杂度低,且该交换方法的适应能力强。 The method of the present invention has little dependence on the physical layer, no need for processes such as modulation and demodulation, and encoding and decoding, thus the low complexity of the satellite payload, and adaptable to the switching method.

[0023] 3、灵活地支持广播和组播功能。 [0023] 3, the flexibility to support broadcast and multicast. 传统的透明转发不支持组播功能。 Traditional transparent transponder does not support multicast. 本发明的方法将透明转发由模拟域转移到数字域来实现,大大提高了星上处理的能力。 The method of the present invention will be clear from the forward transfer to the digital domain to the analog domain to achieve greatly improved the ability to process the satellite. 这样,数字信道化交换可以直接将某信道的信号复制到组播业务所需的不同业务信道中进行传输。 Thus, the digital channelization can simply copy an exchange channel signal to the desired multicast service traffic channels for different transmission.

[0024] 4、系统的信道划分更具灵活性。 [0024] 4, the channel is divided into the system more flexible. 在本发明的数字信道化交换装置中,相邻的子信道可以任意组合以适应各种不同类型的终端以及各种不同类型的业务,实现均勻或非均勻带宽的信道交换。 Digital channelization exchanger of the present invention, the adjacent subchannels can be any combination to suit a variety of different types of terminals and various types of traffic, to achieve uniform or nonuniform bandwidth channel switch.

[0025] 5、系统的功率控制更具有效性。 [0025] 5. The power control system more effective. 在本发明的数字信道化交换方法中,由于信道被划分成粒度更小的子信道,这样可以很方便地实现逐信道自动电平控制或转发器增益控制功能,最大限度地降低互调干扰的影响,使得系统具有最优的负载性能。 Digital channelization exchange method according to the present invention, since the channel is divided into a particle size of smaller subchannels, which can be easily implemented by channel automatic level control or repeater gain control, to minimize intermodulation interference Effects, such that the system has the best load performance.

[0026] 综上所述,本发明提出的数字信道化交换方法既适合均勻带宽星载交换场景,又适合非均勻带宽星载交换场景,满足当今星载转发的需求。 [0026] In summary, the digital channelization exchange method proposed by the present invention is suitable both for switching the scene onboard the bandwidth uniformly, but also for non-uniform bandwidths onboard switching scenario, meet today's demand for spaceborne forwarded. 在本方法中,不需对用户信号进行解调和译码,即其中的处理与信号的内容或波形无关。 In the present method, without the user signal is demodulated and decoded, i.e. independent of the content, or wherein the waveform signal processing. 其次,虽然本发明所提出的星载交换方法,主要是针对卫星通信系统而言,但也可适用于其它软件无线电系统。 Secondly, although the proposed satellite carrier exchange method of the present invention, mainly for the purposes of a satellite communication system, but also applicable to other software radio system.

附图说明 BRIEF DESCRIPTION

[0027] 图1为本发明方法的流程框图; [0027] FIG. 1 is block flow diagram of a method of the present invention;

[0028] 图2为适用于本发明方法的星地上行FDMA信道; [0028] FIG. 2 is a star in the process of the present invention suitable ground line FDMA channels;

[0029] 图3为本发明方法的一个实施例的流程框图; [0029] Figure 3 flow diagram of one embodiment of the present inventive method;

[0030] 图4为本发明方法的测试验证信号频谱图; [0030] FIG 4 test verification signal spectrum inventive method;

[0031] 图5为本发明方法中复指数调制完美重构滤波器的幅频响应; [0031] The method of the present invention in FIG. 5 complex exponential modulated amplitude frequency response of a perfect reconstruction filter;

[0032] 图6为运用本发明方法后子信道交换效果示意图; [0032] FIG. 6 is a schematic view of the effect of a subchannel exchange using the method of the present invention;

[0033] 图7为本发明方法对广播功能支持的示意图; [0033] FIG. 7 of the present invention, a method for broadcasting a schematic functional support;

[0034] 图8为本发明方法对组播播功能支持的示意图。 [0034] Figure 8 is a schematic diagram of the process of the invention support multicast broadcast function.

[0035] 图9是本发明方法在卫星通信中的应用方式。 [0035] FIG. 9 is a method of the present invention is applied in a satellite communication mode.

具体实施方式 Detailed ways

[0036] 本发明提出的星载可重构宽带数字信道化交换方法,首先对星地上行信号进行二次采样,得到等效基本子信道数\为2的次幂的并与一次采样信号具有不同采样率的数字信号;根据二次采样信号的频谱,用二通道无损网格方法,构建一个完美重构原型滤波模块,对完美重构原型滤波模块进行复指数调制,得到一个复指数调制完美重构滤波器组模块;用复指数调制完美重构滤波器组模块中的分析滤波部分对上述二次采样信号进行滤波,得到分离的子信道基带信号;根据卫星设定的交换信息,对上述分离的子信道基带信号进行交换,得到交换后的数据;用上述复指数调制完美重构滤波器组模块中的综合滤波部分对上述交换后的数据进行综合,得到一个星地下行信号。 [0036] The present invention is proposed wideband digital onboard reconfigurable channelization exchange method, first satellite signal ground line subsampling, the number of sub-channels to obtain substantially equivalent \ is a power of 2 and a sampled signal and having digital signals of different sampling rates; a resampled signal based on the spectrum of the non-destructive method for two-channel grid, construct a perfect reconstruction filter module prototype, perfect reconstruction of the prototype filter module complex exponential modulated, to obtain a perfect complex exponential modulated reconstruction filter banks module; modulated perfect reconstruction filter bank analysis filtering section of the module of the secondary signal is filtered samples with a complex exponential, to give the separated sub-channel baseband signal; set according to the switching information satellite, the above-described the isolated sub-channel baseband signal exchange, the exchange of data is obtained; with the above-mentioned complex-exponential modulated synthesis filtering section perfect reconstruction filter bank module for the exchange of data integrated to obtain a signal line underground star.

[0037] 上述方法中,构建完美重构原型滤波模块的充分必要条件是完美重构原型滤波模块的多相分量对Bk(Z)和BM+k(z)满足如下两种关系: [0037] The above-described method, the necessary and sufficient conditions to build prototype filter perfect reconstruction module is the perfect reconstruction polyphase prototype filter module component of Bk (Z) and BM + k (z) satisfy the following two relationships:

[0038] [0038]

[0039] [0039]

[0040] [0040]

B[p){z) BipIk(Z) B [p) {z) BipIk (Z)

cos I sin I cos I sin I

(ml) j (Ml) j

一COS θ A COS θ

k,p k, p

(3) (3)

其中,(3)中的θ为迭代过程中的形式参数,(4)中的m为任意大于等于1的整1 0, 其它 Wherein in (3) θ is the formal parameter in an iterative process, (4), m is any integer greater than or equal to 101, other

[0049] 其中:一和时分别表示该用户信号所占频带的下界和上界。 [0049] wherein: each signal indicates that the user occupied by lower and upper bounds, and when a band. 不同用户子信道间的保护带G定义为 Guard band G defined between different user subchannels

Figure CN101414869BD00061

所有的保护带均相同,且^ =ω'0+2π。 All the protective tape are the same, and ^ = ω'0 + 2π. 最大抽取因子或者内插因子M为 The maximum interpolation factor or decimation factor M is

似= 2iW2"Gmi„)l Like = 2iW2 "Gmi") l

其中=Gmin为G的最小值。 Where G = Gmin is the minimum value.

原型滤波器H(Z)的多相分量对Bk(ζ)和BM+k(z)为 Prototype filter H (Z) of the polyphase components of Bk (ζ) and BM + k (z) is a

(5) (5)

Figure CN101414869BD00062

且满足 And meet

其中: among them:

Figure CN101414869BD00063

可表述为 It can be expressed as

数,M为最大抽取(或内插)因子,其取值由子信道间的最小保护带宽Gmin确定,即 Number, M being the maximum extraction (or interpolation) factor, which is determined by the minimum value Gmin among the guard bandwidth subchannels, i.e.,

[0041] [0041]

Figure CN101414869BD00064

[0042] 上述方法中,复指数调制完美重构滤波器组模块的通道数可以为2M。 The number of channels [0042] In the above method, the complex exponential modulated perfect reconstruction filter bank module may be 2M.

[0043] 上述方法中,复指数调制完美重构滤波器组模块中各分析滤波部分的冲击响应与对应的综合滤波部分的冲击响应相同。 [0043] In the above method, the complex-exponential modulated perfect reconstruction impact impulse responses corresponding to the synthesis filter portion of each analysis filter bank filtering section in response to the same module.

[0044] 下面结合附图,说明本发明方法的工作原理: [0044] DRAWINGS operation principle of the method of the present invention:

[0045] 数字信道化交换的核心就是从一个FDMA上行信道中提取出所希望的用户信号, 并交换到所希望的某个下行信道,即实现这样一个目标:上行波束中的某用户行信号能够路由到同频段(如上下行均为X频段)或不同频段(如上行为X频段,下行为Ka频段)的同一个下行波束或不同下行波束中,甚至还可实现星间交链。 [0045] The core digital channelization exchange is extracted from a FDMA uplink channel a desired user signal, and switched to a desired one of a downlink channel, i.e. to achieve such a goal: a user line signals uplink beam is capable of routing to the same frequency band (X-band as both downlink) or different frequency bands (X-band behavior as described above, the band Ka of behavior) of the same or different downlink beams downlink beams, may also be implemented even inter-satellite linkage. 本发明的“说明书摘要”附图对此进行了说明。 "Abstract" of the present invention, the accompanying drawings illustrates this.

[0046] 假设一个上行信道被均勻划分成V个基本子信道,进行采样率变换后,该上行信道被等效均勻划分成Ne个基本子信道,任何一个用户可以占用一个或者相邻的几个基本子信道。 After [0046] Suppose an upstream channel is divided into uniform basic subchannels V, sampling rate conversion, the upstream channel is divided evenly into equivalent basic sub-Ne, a user can occupy any one or several adjacent basic subchannels. 不同的用户子信道之间具有保护带G,如说明书附图1所示。 Users having different subchannels guard band G, as shown in Figure 1 specification. 需要说明的是,如果某用户占用了多个相邻的基本子信道,这些子信道之间不存在保护带。 Incidentally, if a user occupies a plurality of adjacent sub-base, no guard band exists between the subchannels. 所有保护带的带宽可以相同,也可以不同。 All protective tape bandwidth may be the same or different. 则信道化交换装置的结构如说明书附图2所示。 Of the channel switching apparatus configuration shown in Figure 2 as specification.

[0047] 设卫星接收到的上行信号为 [0047] provided to the satellite uplink signal is received

Figure CN101414869BD00065

(I为同相部分,Q为正交部分,j为虚数单位),所考虑的上行信道被U个用户占用,且第i个用户信号Xi(Z),(i = 0,1,2,-,U-1) (I is the in-phase component, Q is the orthogonal part, j is an imaginary unit), the considered uplink channel is occupied by a user U, and the i-th user signal Xi (Z), (i = 0,1,2, - , U-1)

的频谱满足下面的关系式 Spectrum satisfy the following relation

[0048] [0048]

Figure CN101414869BD00066
Figure CN101414869BD00071

[0062] 进行如下两个优化过程以得到最优的完美重构滤波器h (η) [0062] The following two processes optimized to give the best perfect reconstruction filter h (η)

Figure CN101414869BD00072

[0065] 其中:0彡α彡Ji/(2Μ)。 [0065] wherein: α 0 San San Ji / (2Μ). H(eJ")为h(n)的频率响应。 H (eJ ") frequency response h (n) of the.

[0066] 对h (η)作复指数调制得到 [0066] The h (η) obtained as a complex-exponential modulated

Figure CN101414869BD00073

其中:丽=e_j2"M,(η = 0,1,…,2mM-l,ρ = 0,1,…,2M-1)。同时运用采样率变换SRC模块确保最大抽取因子(或内插因子)与等效的基本子信道数Ve之间存在如下关系 Where: Li = e_j2 "M, (η = 0,1, ..., 2mM-l, ρ = 0,1, ..., 2M-1) while the use of the sample rate conversion module ensures maximum SRC decimation factor (or interpolation factor. ) there is substantially equivalent to the relationship between the number of subchannels Ve

[0069] [0069]

Figure CN101414869BD00074

其中:κ为大于等于1的整数。 Wherein: κ is an integer of 1.

这样得到可实现的数字信道化交换装置的结构如说明书附图3所示。 The thus obtained structure of the digital channelization exchange device may be implemented as shown in Figure 3 specification. 以下介绍本发明方法的实施例: The following describes the embodiments of the method of the present invention:

在介绍具体的实施例前,给出各实施例中需运用的参数(如表1所示) 表1实施例参数表 Before introducing the specific embodiments, are given the parameters (Table 1) Table 1 required the use of various embodiments of Example embodiments datasheets

Figure CN101414869BD00075

[0076] 令Rs = 170Msps,由(5)式可得M = 512。 [0076] Order Rs = 170Msps, from (5), we have M = 512. 令m = 13,通过优化过程⑶禾Π (9), 得到一个13312阶的完美重构原型滤波器h (η),其阻带边缘为31/512,阻带衰减为-96(^。 由式(10)可得到复指数调制的完美重构滤波器组,如图5所示。 So that m = 13, optimization process by ⑶ Wo Π (9), in order to obtain a perfect reconstruction 13312 prototype filter h (η), which is 31/512 stopband edge, stopband attenuation of -96 (^. A the obtained complex-exponential modulation of formula (10) perfect reconstruction filter banks, as shown in FIG.

[0077] 实施例一:用本发明方法进行子信道交换: [0077] Example a: for sub-exchange process of this invention:

[0078] 为了说明子信道交换的灵活性,从而看出本发明所提出的信道化交换结构具有可重构性的特点,假定上行信号如附图4所示。 [0078] In order to illustrate the flexibility of switching subchannels to see channelization exchange structure proposed by the present invention has the features of reconfigurability, the uplink signal is assumed as illustrated in Figure 4. 此处,希望将用户子信道7与用户子信道15进行交换。 Here, the user will want to exchange sub-channels 7 and 15 user subchannels. 交换后,输出的下行信号如图6所示。 After the exchange, the downlink signal output is shown in Fig.

[0079] 从图6可以看出,在下行信道中,用户子信道7与用户子信道15已经互换了位置, 其它各用户子信道保持不变。 [0079] As can be seen from Figure 6, the downlink channel, the user with the user subchannels 7 subchannel 15 has changed places, each of the other subchannels remain unchanged users. 其实该交换过程的实现非常简单方便,根据待交换用户子信道占用基本子信道的数目,调整本发明的附图3中综合滤波器组中相应综合滤波器的个数即可。 In fact, to achieve this exchange process is very simple, to be exchanged in accordance with the number of occupied subchannels basic user subchannels, the number of adjustments to the synthesis filter bank 3 of the present invention corresponding to the drawings synthesis filter. 因此只要已知上行信道中各用户的配置情况以及交换矩阵,通过调整综合滤波器的数目即可完成交换,而不需重新设计滤波器或者进行其它的操作等。 So long as the known configuration for each user of uplink channels and switching matrix, by adjusting the number of the synthesis filter to complete the exchange, without the need to redesign the filter or perform other operation. 这便是可重构星载交换的意义所在。 This is the significance of onboard reconfigurable exchange.

[0080] 实施例二:用本发明方法实现广播与组播功能。 [0080] Example 2: The process of the invention for broadcast and multicast.

[0081] 传统的透明转发器几乎不具有组播功能。 [0081] The conventional transparent transponder almost no multicast. 但本发明的数字信道化交换装置能够很好地支持广播和组播功能,因为该结构中使用了数字信号处理方法,数据可以很容易地复制到输出位置上。 However, the present invention is a digital signal of the channel switching apparatus can support multicast and broadcast functions, because the structure using the digital signal processing method, data can be easily copied to the output position. 此处,仍然采用附图4所示的上行输入信号。 Here, still ascending input signal by the reference 4 in FIG. 对于广播情况,假设用户7 的信息作为广播源,并向所考虑的下行链路中所有的用户广播。 For the broadcast, the user information is assumed as a broadcast source 7, the downlink and the considered broadcast to all users. 该过程如附图7所示。 The process as shown in Figure 7.

[0082] 对于组播情况,假设所考虑的场景存在三个组播群,组播源分别为用户子信道1、 用户子信道2与用户子信道7中的信息。 [0082] For the case of multicast, the considered scenario assumes that there are three multicast group, the multicast source to the respective users 1 subchannel, subchannel information 7 user 2 and the user subchannels. 组播的仿真结果如图8所示。 Multicast simulation results shown in Fig.

[0083] 本发明方法的实现,可参照图9所示的应用方式,其中的模数转换器可以采用400Msps, 14比特精度。 [0083] The implementation of the method of the present invention, reference may be applied embodiment shown in FIG. 9, wherein the analog to digital converter may be employed 400Msps, 14-bit precision. 图9中,DC表示下变频,UC表示上变频,AD表示模数转换,DA表示数模转换,SRC表示采样率变换。 In FIG. 9, DC represents downconverts, UC indicates the conversion, AD represents the analog to digital conversion, DA represents a digital to analog conversion, SRC represents the sampling rate conversion. 表2给出了不同定点运算精度下,本发明方法的主要性能。 Table 2 gives a different precision fixed-point arithmetic, the primary performance of the method of the present invention.

[0084] 表2本发明方法的定点仿真结果 [0084] Table 2 point simulation method of the present invention

[0085] [0085]

Figure CN101414869BD00081

[0086] 本发明提出的数字信道化交换方法既适合均勻带宽星载交换场景,又适合非均勻带宽星载交换场景,满足当今星载转发的需求。 [0086] channelized exchange method proposed by the present invention is suitable both for switching the scene onboard the bandwidth uniformly, but also for non-uniform bandwidths onboard switching scenario, meet today's demand for spaceborne forwarded. 在本方法中,不需对用户信号进行解调和译码,即其中的处理与信号的内容或波形无关。 In the present method, without the user signal is demodulated and decoded, i.e. independent of the content, or wherein the waveform signal processing. 其次,虽然本发明所提出的星载交换方法,主要是针对卫星通信系统而言,但也可适用于其它软件无线电系统。 Secondly, although the proposed satellite carrier exchange method of the present invention, mainly for the purposes of a satellite communication system, but also applicable to other software radio system.

Claims (4)

1. 一种星载可重构宽带数字信道化交换方法,其特征在于,该方法包括以下步骤:(1)对星地上行信号进行二次采样,得到等效基本子信道数Ve为2的次幂的并与一次采样信号具有不同采样率的数字信号;(2)根据上述二次采样信号的频谱,用二通道无损网格方法,构建一个完美重构原型滤波模块,对完美重构原型滤波模块进行复指数调制,得到一个复指数调制完美重构滤波器组模块;(3)用上述复指数调制完美重构滤波器组模块中的分析滤波部分对上述二次采样信号进行滤波,得到分离的子信道基带信号;(4)根据卫星设定的交换信息,对上述分离的子信道基带信号进行交换,得到交换后的数据;(5)用上述复指数调制完美重构滤波器组模块中的综合滤波部分对上述交换后的数据进行综合,得到一个星地下行信号。 An onboard reconfigurable wideband digital channelization exchange method, characterized in that the method comprises the steps of: (1) signals of satellite ground line subsampling to obtain substantially equivalent to the number of subchannels Ve 2 and the power of a digital signal sampled signal having different sampling rates; (2) the spectrum of the secondary signal is sampled, with the two-channel lossless grid method to construct a perfect reconstruction filter module prototype, the prototype for perfect reconstruction complex exponential modulated filter module, to give a complex exponential modulated perfect reconstruction filter bank module; and (3) filtering the sampled signal by the secondary analysis of complex exponential modulated filter portion of the perfect reconstruction filter bank module, to give the isolated sub-channel baseband signal; (4) the exchange of information set in the satellite, said separated sub-channel baseband signal exchange, the exchange data is obtained; (5) the complex-exponential modulated using perfect reconstruction filter banks module synthesis filter portion of the data exchange integrated to obtain a signal line underground star.
2.如权利要求1所述的方法,其特征在于所述的构建完美重构原型滤波模块的充分必要条件是完美重构原型滤波模块的多相分量对Bk(Z)和BM+k(z)满足如下两种关系 2. The method according to claim 1, characterized in that the necessary and sufficient conditions to build prototype filter perfect reconstruction module is the perfect reconstruction of the prototype filter module polyphase components of Bk (Z) and BM + k (z according to ) satisfy the following two relationships
Figure CN101414869BC00021
其中,θ为迭代过程中的形式参数,m为任意大于等于1的整数,M为最大抽取或内插因子,其取值由子信道间的最小保护带宽Gmin确定,即 Wherein, [theta] is a parameter in the form of iteration, m is an arbitrary integer greater than 1, M being the maximum decimation or interpolation factor within which the value determined by the minimum Gmin between the guard bandwidth subchannels, i.e.,
Figure CN101414869BC00022
3.如权利要求1所述的方法,其特征在于所述的复指数调制完美重构滤波器组模块的通道数为2M。 The method according to claim 1, wherein said complex-exponential modulated filter bank channels perfect reconstruction module is 2M.
4.如权利要求1所述的方法,其特征在于所述的复指数调制完美重构滤波器组模块中各分析滤波部分的冲击响应与对应的综合滤波部分的冲击响应相同。 4. The method according to claim 1, characterized in that said complex exponential modulated synthesis filter portion perfect reconstruction impact impulse response filter section of each analysis filter bank module corresponding response to the same.
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