WO2008049283A1 - Procédé et système pour une émission et une réception de données en utilisant des codes de brouillage pour identifier des cellules - Google Patents

Procédé et système pour une émission et une réception de données en utilisant des codes de brouillage pour identifier des cellules Download PDF

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Publication number
WO2008049283A1
WO2008049283A1 PCT/CN2006/003071 CN2006003071W WO2008049283A1 WO 2008049283 A1 WO2008049283 A1 WO 2008049283A1 CN 2006003071 W CN2006003071 W CN 2006003071W WO 2008049283 A1 WO2008049283 A1 WO 2008049283A1
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Prior art keywords
data
information
signal
parallel
scrambling code
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PCT/CN2006/003071
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English (en)
French (fr)
Inventor
Fajun Yan
Tao Tao
Qihong Ge
Dong Bai
Wen Chen
Qinghua Yang
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Timi Technologies Co., Ltd.
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Publication of WO2008049283A1 publication Critical patent/WO2008049283A1/zh

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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00Baseband systems
    • H04L25/02Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/03Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
    • H04L25/03828Arrangements for spectral shaping; Arrangements for providing signals with specified spectral properties
    • H04L25/03866Arrangements for spectral shaping; Arrangements for providing signals with specified spectral properties using scrambling
    • 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
    • H04L27/2647Arrangements specific to the receiver only

Definitions

  • the present invention relates to the field of digital information transmission technologies, and in particular, to a data transmission system and method for distinguishing cells based on OFDM using a scrambling code. Background technique
  • digital broadcasting In addition to wide coverage and large program capacity, digital broadcasting is characterized by its broadcastability, point-to-multipoint, and point-to-point. The cost of broadcasting information is independent of the number of users. Therefore, digital broadcasting, as an important part of the information and communication industry, plays an important role in the construction of national information infrastructure, the realization of universal services and national information security strategies.
  • Orthogonal Frequency Division Multiplexing (OFDM) technology originated in the 1950s, but it has not received widespread attention due to the limitations of technological development at that time. After the 1990s, the development of digital signal processing technology and large-scale integrated circuit technology enabled the large-scale application of OF technology. Because OFDM technology can effectively resist multipath, eliminate inter-symbol interference (ISI), and has high spectrum utilization, it has been widely used in wired and wireless systems, such as digital audio broadcasting (DAB) and digital video technology. 0FDM technology is used in (DVB), Asymmetric Data Subscriber Line (ADSL), IEEE802.11a WLAN, ⁇ 02. 16a wireless metropolitan area network.
  • DSL digital audio broadcasting
  • DSL digital video technology
  • 0FDM technology is used in (DVB), Asymmetric Data Subscriber Line (ADSL), IEEE802.11a WLAN, ⁇ 02. 16a wireless metropolitan area network.
  • the present invention utilizes discrete pilots in an OFDM system in combination with scrambling information of a cell to achieve the purpose of distinguishing cells. According to the system and method of the present invention, by transmitting a pseudo-random (PN) sequence of different initial values for different cells at the transmitting end, the receiving end can determine the cell to which it belongs according to the received PN sequence.
  • PN pseudo-random
  • the data transmitting and receiving system for distinguishing cells by using the scrambling code proposed by the invention comprises a transmitting end and a receiving end.
  • the transmitting end includes: a coding interleaver for encoding and interleaving data information; a modulator for respectively modulating pilot information and encoded interleaved data information; a multiplexer for multiplexing the foregoing Modulating data information and pilot information to obtain multiplexed data; a scrambling code generator for generating a pseudo-random random sequence with cell flag information; and a memory for performing stringing on the multiplexed data subjected to the pseudo-random random sequence scrambling code And transforming and adding subcarriers, performing parallel-to-serial conversion on the signal output by the IFFT converter and adding a cyclic prefix; an IFFT converter for performing IFFT conversion on the signal output by the above memory; and a low-pass filter for the above memory The output signal is low-pass filtered to obtain a transmitted signal.
  • the receiving end includes: a low pass filter, configured to perform low pass filtering on the baseband signal received by the radio frequency unit; a memory, configured to de-cycle the signal outputted by the low pass filter, and perform serial-to-parallel conversion to obtain a parallel signal, and a signal for outputting the FFT converter to remove the virtual subcarrier and performing parallel-to-serial conversion; an FFT converter for performing FFT conversion on the parallel signal; and detecting means for detecting the received pilot symbol a cell, and performing descrambling on the received data by using the detected cell scrambling code; and an equalizer, configured to perform domain average on the pilot symbols after descrambling a demodulator that demodulates data information after frequency domain equalization; a deinterleaving and decoder for deinterleaving and decoding the demodulated data information to recover the transmitted data information.
  • a low pass filter configured to perform low pass filtering on the baseband signal received by the radio frequency unit
  • a memory configured to de-cycle the signal outputted by the
  • the receiving end further includes interference cancellation means, configured to perform interference cancellation on the interference cell information detected by the detecting apparatus.
  • interference cancellation means configured to perform interference cancellation on the interference cell information detected by the detecting apparatus.
  • Another aspect of the present invention provides a data transmission and reception method for distinguishing cells by using a scrambling code, including a data generation method and a data reception method.
  • the data generating method includes: encoding and interleaving data information by a coding interleaver; separately modulating pilot information and coded interleaved data information by a modulator; and modulating the modulated data information and a guide by a multiplexer Frequency information is multiplexed to obtain multiplexed data; a pseudo-random random sequence with cell flag information is generated by the scrambling code generator as a scrambling code; and the scrambled multiplexed data is serial-parallel transformed and added to the sub-carrier through the memory; Performing IFFT conversion on the signal output by the memory by the IFFT converter; performing parallel-to-serial conversion on the signal output by the IFFT converter through a memory and adding a cyclic prefix; and performing low-pass filtering on the signal output by the register through a low-pass filter Send a signal.
  • the data receiving method includes: performing low-pass filtering on the baseband signal received by the radio frequency unit through a low-pass filter; de-cyclically pre-routing the signal outputted by the low-pass filter through the memory, and performing serial-to-parallel conversion to obtain a parallel signal; Performing FFT transformation on the parallel signal by using an FFT converter; removing the virtual subcarrier by the FFT-transformed signal by the memory and performing parallel-to-serial conversion; detecting the belonging cell by using the received pilot symbol by using the detecting device, and using the detected belonging
  • the scrambling code of the cell descrambles the received data; using the equalizer, the pilot symbols after descrambling Performing frequency domain equalization; demodulating data information after frequency domain equalization by a demodulator; deinterleaving and decoding the demodulated data information by deinterleaving and decoding, and recovering the transmitted data information.
  • the data receiving method further comprises the dry detection means detects the information ⁇ J cell interference cancellation step.
  • the scrambling code generator is a shift register, and the scrambling code is generated by different initial values of the register and the same generator polynomial, wherein different initial values of the register mark different cells.
  • the modulation method of the data information in the present invention can be selected according to actual needs and channel environment.
  • the receiver can determine the cell to which it belongs and the interfering cell that may exist, and the interference cancellation technology can be used to reduce the interference effect of other cells on the cell to which the cell belongs.
  • FIG. 1 is a block diagram showing a structure of a data transmitting portion for distinguishing cells by using a scrambling code according to the present invention
  • FIG. 2 is a block diagram showing a structure of a data receiving portion for distinguishing cells by using a scrambling code according to the present invention
  • FIGS. 3, 4, and 5 are views of an embodiment of the present invention.
  • FIG. 6 is a structural diagram of a linear feedback shift register generating a scrambling code according to an embodiment of the present invention
  • FIG. 7 is a schematic diagram of a subcarrier structure of an OFDM symbol according to an embodiment of the present invention
  • FIG. 8 is a flowchart of a process for detecting a cell according to an embodiment of the present invention.
  • FIG. 1 is a block diagram of a data transmission process for distinguishing cells by using a scrambling code according to the present invention. The steps in the figure are explained below.
  • the data information after the processing such as encoding and interleaving is modulated, and the modulation mode can be variously selected according to the actual application and the channel condition.
  • BPSK, QPSK, 8PSK, 16QAM, 32QAM, and the like can be selected as needed.
  • 3, 4, and 5 are diagrams showing different phase modulation patterns in the present embodiment.
  • the initial values of the initial values of the scrambling code shift register correspond to different cells. When the number of cells is greater than 8, the scrambling code is used according to a certain rule. Force perturbation is achieved by complex multiplication of the complex symbols on the effective subcarriers and the complex pseudo-random sequence p c W.
  • Y n (i) X n (i) xP c (n N v + i), 0 ⁇ i ⁇ N y -l, 0 ⁇ n ⁇ 52
  • the above-mentioned signal Y is serial-converted by the memory, and then the virtual sub-carrier is added.
  • the structure of the OFDM symbol subcarrier is as shown in FIG. In the figure, the relationship between the effective subcarrier and each subcarrier of the OFDM symbol is as follows:
  • the virtual subcarrier is removed as shown in Figure 7, and the information on the effective subcarrier is parallel-transformed.
  • the discrete pilot is extracted from the effective subcarrier, and correlated detection is performed with 8 possible cell scrambling codes, and the related detection processing procedure of the detected cell is as shown in FIG. 8. Wherein, since the original discrete pilot information is 1 + 0 , the information on the scattered pilot after scrambling is the scrambling code information.
  • the position of the scattered pilot is fixed at the position of the subcarrier, and the 8 possible cell scrambling codes are extracted according to the discrete pilot positions, and 8 corresponding scrambling code subsets are formed.
  • the received discrete pilot information is correlated with the eight possible discrete pilot information one by one, and is sorted according to the size of the relevant power.
  • the mode with the highest power corresponds to the cell to which the receiving end belongs. According to certain rules, it can be determined whether there is an interfering cell and can Determine the scrambling mode adopted by the interfering cell. For example, by using the threshold decision method, the correlation power obtained is compared with the preset threshold.
  • the interference cancellation technology can be used to eliminate the interference.
  • the received effective subcarrier is descrambled by using the scrambling code sequence in this mode.
  • the pilot information is extracted from the data type after descrambling, channel estimation is performed, channel characteristics at the current time are obtained, and then the received data information is frequency-domain-equalized according to the obtained channel characteristics. Then, the frequency domain data information is demodulated according to the mode of data modulation, and finally the demodulated data information is deinterleaved and decoded, thereby recovering the original data information.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Power Engineering (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Detection And Prevention Of Errors In Transmission (AREA)

Description

一种利用扰码区分小区的数据发送及接收系统及方法 技术领域 本发明涉及数字信息传输技术领域, 尤其是涉及一种基于 OFDM 的利用扰码区分小区的数据传输系统和方法。 背景技术
数字广播除了覆盖面广、 节目容量大之外, 最大的特点就是具有 广播性, 一点对多点、 一点对面, 广播信息的成本与用户数量无关。 因此, 数字广播作为信息通信业的一个重要组成部分, 在国家信息基 础设施建设、 实现普遍服务和国家信息安全战略中具有重要地位。
正交频分复用 ( OFDM )技术起源于 10世纪 50年代, 但由于当时 技术发展水平的限制, 并没有得到广泛的关注。 到了 20世纪 90年代 之后, 数字信号处理技术和大规模集成电路技术的发展, 使 OF應技术 的大规模应用成为可能。 由于 OFDM技术能够有效抵抗多径, 消除码间 干扰(ISI ), 具有较高的频谱利用率等特点, 现在已经被广泛用于有 线和无线系统中, 比如数字音频广播(DAB )、 数字视频技术(DVB )、 非对称数据用户环线(ADSL )、 IEEE802. 11a无线局域网、 ΙΕΕΕδ 02. 16a 无线城域网等领域都用到了 0FDM技术。 在现有的数字广播技术中, 需要在数据信息中加入单独的数据段 用以包含标志不同小区的信息, 如何利用 0FDM拔.术使得该标识信息得 以通过更有效的方式得到传输和利用, 以控制数据的传输量, 是一个 值得克服的技术问题。 · 发明内容 为了解决上述问题, 本发明利用 OFDM系统中离散导频与小区的 扰码信息相结合, 达到区分小区的目的。 根据本发明的系统与方法, 通过在发送端对于不同的小区发送不同初值的伪随机(PN )序列, 接 收端可以根据接收到的 PN序列来确定所属小区。 本发明提出的利用扰码区分小区的数据发送及接收系统, 包括 发送端和接收端。 所述发送端包括: 编码交织器, 用于将数据信息进行编码和 交织; 调制器, 用于对导频信息和经过编码交织的数据信息分别 进行调制; 复接器, 用于复接上述经过调制的数据信息和导频信 息, 得到复接数据; 扰码生成器, 用于生成带有小区标志信息的 复伪随机序列; 存储器, 对经过上述复伪随机序列扰码的复接数 据进行串并变换以及加入子载波, 并对 IFFT变换器输出的信号进 行并串变换并加入循环前缀; IFFT变换器, 用于对上述存储器输 出的信号进行 IFFT变换; 低通滤波器, 用于对上述存储器输出的 信号进行低通滤波后得到发送信号。 所述接收端包括: 低通滤波器, 用于对射频单元接收到的基 带信号进行低通滤波; 存储器, 用于对上述低通滤波器输出的信 号去循环前綴, 并进行串并变换, 得到并行信号, 以及用于将 FFT 变换器输出的信号去掉虚子载波且进行并串变换; FFT变换器, 用 于对上述并行信号进行 FFT变换; 检测装置, 用于利用接收到的 导频符号检测所属小区, 并用检测到的所属小区扰码对接收到的 数据进行解扰;.均衡器, 用于对解扰之后的导频符号进行 域均 衡; 解调器, 对经过频域均衡之后的数据信息进行解调; 解交织 和译码器, 用于对解调之后的数据信息进行解交织和译码, 恢复 发送的数据信息。 所述接收端还包括干扰消除装置, 用于对所述检测装置检测到的 干扰小区信息进行干扰消除。 本发明另一方面提出一种利用扰码区分小区的数据发送及接收 方法, 包括数据生成方法和数据接收方法。 所述数据生成方法包括: 通过编码交织器对数据信息进行编 码和交织; 通过调制器对导频信息和经过编码交织的数据信息分 别进行调制; 通过复接器对上述经过调制的数据信息和导频信息 进行复接, 得到复接数据; 通过扰码生成器生成带有小区标志信 息的复伪随机序列作为扰码; 通过存储器对经过扰码的复接数据 进行串并变换以及加入子载波; 通过 IFFT变换器对上述存储器输 出的信号进行 IFFT变换; 通过存储器对上述 IFFT变换器输出的 信号进行并串变换并加入循环前缀; 通过低通滤波器对上述寄存 器输出的信号进行低通滤波后得到发送信号。 所述数据接收方法包括: 通过低通滤波器对射频单元接收到 的基带信号进行低通滤波; 通过存储器对上述低通滤波器输出的 信号去循环前缀, 并进行串并变换, 得到并行信号; 通过 FFT变 换器对上述并行信号进行 FFT变换; 通过存储器将上述 FFT 换 得到的信号去掉虚子载波且进行并串变换; 通过检测装置, 利用 接收到的导频符号检测所属小区, 并用检测到的所属小区的扰码 对接收到的数据进行解扰; 利用均衡器, 对解扰之后的导频符号 进行频域均衡; 通过解调器对经过频域均衡之后的数据信息进行 解调; 通过解交织和译码器对解调之后的数据信息进行解交织和 译码, 恢复发送的数据信息。 所述数据接收方法还包括对所述检测装置检测到的干^ J小区信 息进行干扰消除的步骤。 所述扰码生成器为移位寄存器, 所属扰码通过不同的寄存器初值 和相同的生成多项式产生, 其中, 不同的寄存器初值标志不同的小区。
本发明中数据信息的调制方法根据实际需要和信道环境可以进行 选择。 通过该方法, 接收机能够确定所属小区及可能存在的干扰小区, 可以采用干扰消除技术降低其他小区对所属小区的干扰影响。
本发明的系统方法具有以下有益效果: 接收端通过相关接收, 可以 较准确区分所属小区和其他小区; 可以方便采用干扰消除技术降低其 他小区的干扰。 本发明可以广泛应用于卫星广播、 地面无线广播系统中的固定终 端、 移动终端。 附图说明 图 1为本发明的利用扰码区分小区的数据发送部分结构框图; 图 2为本发明的利用扰码区分小区的数据接收部分结构框图; 图 3、 4、 5 为对本发明实施例中数据信息的不同的相位调制方式 图; 图 6为本发明实施例中产生扰码的线性反馈移位寄存器结构图; 图 7为本发明实施例中 OFDM符号的子载波结构图; 图 8为本发明实施例中检测小区的处理流程图。 具体实施方式 下面参照附图对本发明的优选实施例进行详细说明。 基于 OFDM的卫星广播系统传输结构由帧、 时隙、 OFDM符号 3层组 成。 每帧分为 40个时隙, 每时隙分为 53个 OFDM符号。 广播系统釆样率为 10匪 z,通过 4096点 IFFT在 7. 51MHz的带宽内 使用 3076个子载波, 其中有 82个连续导频, 384个离散导频, 2610 个负载子载波。 在频域上, 利用 384个离散导频结合小区的扰码信息 可以区分不同的小区。 图 1 为本发明的利用扰码区分小区的数据发送流程框图。 图中各 步骤说明如下。 经过编码和交织等处理之后的数据信息进行调制, 调制方式根据 实际应用和信道情况可以有多种选择, 如可根据需要选用 BPSK、 QPSK、 8PSK、 16QAM、 32QAM等多种调制方法。 图 3、 4、 5为对本实施例中不 同的相位调制方式图。 离散导频的描述如下: 记 n 为每个时隙中 0F丽符号的编号, 0≤"≤52; m为每个 0FDM符号中离散导频对应的子载波编号, 则 m取 值如下: if mod(n,2) ==0 if
Figure imgf000008_0001
对于 384个离散导频, 调制时全部映射为1 + 对于连续导频, 其使用的是第 0, 22, 78, 92, 168, 174, 244
274, 278, 344, 382, 424, , 426, 496, 500, 564, 608, 650, 688,
712, 740, 772, 846, 848, 932, 942, 950, 980 , 1012, 1066, ( 1126,
1158, 1214, 1244, 1276, 1280, 1326, 1378, 1408, 1508, 1537,
1538, 1566, 1666, 1736, 1748, 1794, 1798, 1830, 1860, 1916,
1948, 2008, 2062, 2094, 2124, 2132, 2142, 2226, 2228, 2302,
2334, 2362, 2386, 2424, 2466, 2510, 2574, 2578, 2648, 2650,
2692, 2730, 2796, 2800, 2830, 2900, 2906, 2982, 2996, 3052,
3075个子载波, 共 82个, 连续导频采用 BPSK进行相位调制。 所有符号(有效子载波), 包括数据子载波、 离散导频和连续导频 等,均被一个复伪随机序列 AW扰码。复伪随机序列 生成方式如下:
Figure imgf000008_0002
其中, 和 ()为二进制伪随机序列, 由图 6所示的线性反馈移 位寄存器产生, 其对应的生成多项式为: + + + ^+1。 移位寄存 器的初始值提供 8种不同选项, 如表 1所示: 选项 初始值
0 0000 0000 0001
1 0000 1001 0011
2 0000 0100 1100
3 0010 1011 0011
4 0111 0100 0100
5 0000 0100 1100
6 0001 0110 1101
7 0010 1011 0011 表 1、 扰码移位寄存器初始值 不同的初始值对应不同的小区, 当小区个数大于 8 时, 根据一定 的规则扰码 用。 通过将有效子载波上的复符号和复伪随机序列 pc W进行复数乘法 实现力口扰. Yn(i) = Xn(i)xPc(n Nv + i), 0≤i≤Ny -l,0≤n≤52 由存储器对上述信号 Y进行串并变换后, 加入虛子载波。 OFDM符 号子载波的结构如图 7所示。 图中, 有效子载波与 OFDM符号各子载波 之间的关系如下式所示:
Figure imgf000010_0001
b(m, n)■ a(m,n -1020), 2558 <n< 4095
0, " = 0或者 1539≤"≤ 2557 , 0<m<52 , 其中有效 子载波符号为 a (m, n) , OFDM频域符号为 b (m, n)。 随后采用离散反傅立叶变换( IFFT)将上述 OF顧符号变换到时域, c{k) = IFFT[b(n)] =— ί— Υ b(n) · e j2 ,ki e ,0<^<4095
得到: 4096厶" =。 。 将 IFFT变换之后的时域符号进行并串变换并加循环前缀。 经过低通滤波器之后送到 RF单元, 低通滤波器的系数根据需要进 行设定。 图 1 为本发明的利用扰码区分小区的数据接收流程框图, 图中各 步骤具体说明如下。 首先对于 RF单元送来的数据进行低通滤波, 低通滤波器的系数根 据需要进行设定。 根据 OFDM符号参数去掉循环前缀, 并将数据进行并串变换。 根据下式对数据进行 FFT变换, 将时域信号变换到频域上: b{n) = FFT[c(k)] = b(n) · e— ^ ""傷 , 0≤ "≤ 4095 才艮据图 7 所示去掉虚子载波, 并将有效子载波上信息进行并串变 换。 从有效子载波中取出离散导频, 与 8种可能的小区扰码进行相关 检测 , 检测小区的相关检测处理过程如图 8所示。 其中, 由于原始的离散导频信息是 1 + 0 故加扰之后离散导频上 的信息就是扰码信息。 离散导频的位置在子载波的位置固定, 对于 8 种可能的小区扰码按照离散导频位置抽取, 形成了 8 个对应的扰码子 集。 将接收到的离散导频信息与 8种可能的离散导频信息逐一相关, 并按照相关功率的大小排序, 功率最大的模式对应接收端所属小区, 按照一定的规则可以判断是否存在干扰小区并能确定干扰小区采用的 扰码模式。 比如采用门限判决法, 得到的相关功率和预设的门限比较, 如果干扰小区的相关功率大于门限值, 认为存在较明显的干扰, 可以 采用干扰消除技术消除干扰。 确定所属小区对应的扰码模式之后, 用此模式下的扰码序列对接 收到的有效子载波进行解扰。 从解扰之后的数据种取出导频信息, 进行信道估计, 得到当前时 间的信道特征, 随后根据得到的信道特征对接收到的数据信息进行频 域均衡。 然后根据数据调制的模式进行频域数据信息的解调, 最后对 解调之后的数据信息解交织和译码, 从而恢复出原始数据信息。 本发明不局限于上述特定实施例子, 在不背离本发明精神及其实 质情况下, 熟悉本领域技术人员可根据本发明作出各种相应改变和变 形, 但这些相应改变和变形都应属于本发明所附权利要求保护范围之 内。

Claims

权 利 要 求
1、 一种 OFDM系统中利用扰码区分小区的数据发送及接收系 统, 包括发送端和接收端, 其特征在于, 所述发送端包括: 编码交织器, 用于将数据信息进行编码和交织; 调制器, 用于对导频信息和经过编码交织的数据信息分别进 行调制; 复接器, 用于复接上述经过调制的数据信息和导频信息, 得 到复接数据; 5 扰码生成器, 用于生成带有小区标志信息的复伪随机序列; 存储器, 用于对经过上述复伪随机序列扰码的复接数据进行 串并变换以及加入子载波, 以及对 IFFT变换器输出的信号进行并 串变换并加入循环前缀;
IFFT变换器, 用于对上述复接数据进行 IFFT变换; 低通滤波器, 用于对上述寄存器输出的信号进行低通滤波后 得到发送信号; 所述接收端包括: 低通滤波器, 用于对射频单元接收到的基带信号进行低通滤 波; 寄存器, 用于对上述低通滤波器输出的信号去循环前缀, 并 进行串并变换, 得到并行信号;
FFT变换器, 用于对上述并行信号进行 FFT变换; 存储器, 用于将上述 FFT变换得到的信号去掉虛子载波且进 行并串变换; 检测装置, 用于利用接收到的导频符号检测所属小区, 并用 检测到的所属小区扰码对接收到的数据进行解扰; 均衡器, 用于对解扰之后的导频符号进行频域均衡; 解调器, 对经过频域均衡之后的数据信息进行解调; 解交织和译码器, 用于对解调之后的数据信息进行解交织和 译码, 恢复发送的数据信息。
2、 如权利要求 1所述的系统, 其特征在于, 所述接收端还包括干 扰消除装置,用于对所述检测装置检测到的干扰小区信息进行千扰消 除。
3、 一种 OFDM系统中利用扰码区分小区的数据发送及接收方 法, 包括数据生成方法和数据接收方法, 其特征在于, 所述数据生成方法包括: 通过编码交织器对数据信息进行编码和交织; 通过调制器对导频信息和经过编码交织的数据信息分别进行 调制; 通过复接器对上述经过调制的数据信息和导频信息进行复 接,'得到复接数据; 通过扰码生成器生成带有小区标志信息的复伪随机序列作为 扰码; 通过存储器对经过扰码的复接数据进行串并变换以及加入子 载波; 通过 IFFT变换器对上述存储器输出的信号进行 IFFT变换; 通过存储器对上述 IFFT变换器输出的信号进行并串变换并加 入循环前缀; 通过低通滤波器对上述寄存器输出的信号进行低通滤波后得 到发送信号; 所述数据接收方法包括: 通过低通滤波器对射频单元接收到的基带信号进行低通滤 波; 通过存储器对上述低通滤波器输出的信号去循环前缀, 并进 行串并变换, 得到并行信号; 通过 FFT变换器对上述并行信号进行 FFT变换; 通过存储器将上述 FFT变换得到的信号去掉虚子载波且进行 并串变换; 通过检测装置, 利用接收到的导频符号检测所属小区, 并用 检测到的所属小区的扰码对接收到的数据进行解扰; . 利用均衡器, 对解扰之后的导频符号进行频域均衡; 通过解调器对经过频域均衡之后的数据信息进行解调; 通过解交织和译码器对解调之后的数据信息进行解交织和译 码, 恢复发送的数据信息。
4、 如权利要求 3所述的方法, 其特征在于, 所述数据接收方法还 包括对所述检测装置检测到的干扰小区信息进行千扰消除的步骤。
5、 如权利要求 3所述的方法, 其特征在于, 所述扰码生成器为移 位寄存器, 所述扰码由不同的寄存器初值和相同的生成多项式产生, 其中, 不同的寄存器初值标志不同的小区。
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