WO2011143859A1 - 一种解调方法及装置 - Google Patents

一种解调方法及装置 Download PDF

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Publication number
WO2011143859A1
WO2011143859A1 PCT/CN2010/076306 CN2010076306W WO2011143859A1 WO 2011143859 A1 WO2011143859 A1 WO 2011143859A1 CN 2010076306 W CN2010076306 W CN 2010076306W WO 2011143859 A1 WO2011143859 A1 WO 2011143859A1
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Prior art keywords
service
group
average
power
interference
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PCT/CN2010/076306
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English (en)
French (fr)
Inventor
陈琼
余秋星
张文忠
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中兴通讯股份有限公司
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Publication of WO2011143859A1 publication Critical patent/WO2011143859A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
    • H04L25/03006—Arrangements for removing intersymbol interference
    • H04L25/03159—Arrangements for removing intersymbol interference operating in the frequency domain
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
    • H04L25/03993—Noise whitening
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/06—Receivers
    • H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
    • H04B1/1027—Means associated with receiver for limiting or suppressing noise or interference assessing signal quality or detecting noise/interference for the received signal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
    • H04L25/03006—Arrangements for removing intersymbol interference
    • H04L2025/0335—Arrangements for removing intersymbol interference characterised by the type of transmission
    • H04L2025/03375—Passband transmission
    • H04L2025/03414—Multicarrier

Definitions

  • the present invention relates to the field of Orthogonal Frequency Division Multiplexing (OFDM) technology, and in particular, to a demodulation method and apparatus.
  • OFDM Orthogonal Frequency Division Multiplexing
  • the transmission mode can be SIMO (Single Input Multiple Output), SIMO is a form of smart antenna technology for wireless communication, which is sent on the transmitter with a single antenna. Signal, multiple antennas receive signals at the receiver, or MIMO (Multi-input Multi-output), which is an abstract mathematical model used to describe multi-antenna wireless communication systems. Multiple antennas at the transmitting end can be used to independently transmit signals, and at the receiving end, multiple antennas can be used to receive and restore the original information.
  • Existing MIMO systems are mainly divided into two modes: transmit diversity and spatial multiplexing.
  • the demodulation performance can be improved by improving the coding matrix, but the effect is limited.
  • the demodulation performance of the terminal is degraded very fast, resulting in demodulation of the service data.
  • the technical problem to be solved by the present invention is to provide a demodulation method and apparatus for improving demodulation performance in a case where traffic data received by a terminal is interfered.
  • a demodulation method of the present invention includes:
  • the terminal groups the service REs in the resource elements (REs) on the service symbols in the baseband frequency domain signal, which are called service groups, and calculates the interference reduction coefficients corresponding to each service group, and the baseband frequency domain corresponding to each service group.
  • the signal and/or channel estimation value is multiplied by the interference reduction coefficient corresponding to the service group, and the baseband frequency domain signal and the channel estimation value after the interference reduction processing are demodulated.
  • the method for calculating the interference reduction coefficient corresponding to each service group includes:
  • Calculating an average power of the service group calculating an average signal power at the pilot by using a pilot of the serving cell of the terminal, and calculating each according to a ratio of an average signal power at the pilot to an average signal power of the service.
  • the average signal power of the service group, and the average noise interference power of each service group is calculated according to the average signal power of each service group and the corresponding average power;
  • the reference group is selected, and the average noise interference power of the reference group is divided by the average noise interference power of each service group, and the corresponding interference reduction coefficient is obtained.
  • the terminal selects a reference group according to the value of the average noise interference power of each service group, the number of service REs in each service group, or the group in which the serving cell pilot is located.
  • calculating the interference reduction coefficient corresponding to each service group includes:
  • the terminal groups the service REs in the REs on the service symbols in the baseband frequency domain signal
  • the terminal REs of the service symbols that are interfered by the source and have the same interference type are grouped into one group.
  • a demodulation device includes: a resource element grouping module, a noise reduction coefficient calculation module, a interference reduction module, and a demodulation module, wherein:
  • the resource element grouping module is configured to group the service REs in the resource elements (RE) on the service symbols in the baseband frequency domain signal, which is called a service group, and after completing the grouping, to the interference reduction coefficient calculation module Send a notification message;
  • the interference reduction coefficient calculation module is configured to: after receiving the notification message, calculate a interference reduction coefficient corresponding to each service group, and send the interference reduction coefficient to the interference reduction module;
  • the interference reduction module is configured to multiply the baseband frequency domain signal and/or channel estimation value corresponding to each service group by the interference reduction coefficient corresponding to the service group, and reduce the interference processed baseband frequency domain signal and channel.
  • the estimated value is sent to the demodulation module;
  • the demodulation module is configured to demodulate the received baseband frequency domain signal and the channel estimate.
  • the interference reduction coefficient calculation module is configured to calculate an average power of the service group when calculating a interference reduction coefficient corresponding to each service group, and calculate the pilot by using a pilot of the serving cell of the terminal.
  • the average signal power at the location based on the ratio of the average signal power at the pilot to the average signal power of the service, calculates the average signal power for each service group, based on the average signal power and corresponding average power of each service group.
  • the average noise interference power of the reference group is divided by the average noise interference power of each service group to obtain the corresponding interference reduction coefficient.
  • the interference reduction coefficient calculation module is configured to select the reference according to a value of an average noise interference power of each service group, a quantity of service REs in each service group, or a group in which a serving cell pilot is located. group.
  • the interference reduction coefficient calculation module is configured to calculate an average power of each packet when calculating a interference reduction coefficient corresponding to each service group; and divide an average power of the reference group by each service group The average power is obtained by the corresponding interference reduction coefficient of each service group.
  • the resource element grouping module is configured to, when grouping the service REs in the REs on the service symbols in the baseband frequency domain signal, the service REs on the service symbols that are subject to interference and have the same interference type As a group.
  • the present invention groups the RE (resource element) on the service symbol according to the interference source and the interference type, and records the group including the service RE as a service group, and respectively performs the baseband frequency domain signal on the RE in the corresponding service group. And/or the channel estimation value is multiplied by a reduced interference coefficient, and is demodulated by using the baseband frequency domain signal and the channel estimation value after the interference reduction, and the present invention can effectively improve the demodulation performance when the service data is interfered by the neighboring cell, and further Improve system throughput.
  • FIG. 1 is a flowchart of a demodulation method according to an embodiment of the present invention.
  • LTE Long Term Evolution
  • FIG. 3 is a schematic diagram of an application example 1 of the present invention.
  • FIG. 5 is a block diagram of a demodulation apparatus according to an embodiment of the present invention. Preferred embodiment of the invention
  • the idea of this embodiment is that the terminal converts the received time domain signal into a baseband frequency domain signal, and groups the resource elements in the service symbol. Since the source and interference type of the interference cannot be known in advance, all possible interferences are analyzed. And dividing the resource element in the service symbol with the same interference type and the interference type into a service group, and correspondingly processing the baseband frequency domain signal and/or channel estimation value corresponding to each service group according to the corresponding interference reduction coefficient, The quality of the demodulated signal is improved, and the demodulation performance is improved by inter-grounding. This embodiment is more effective in the case where only part of the service RE is interfered.
  • FIG. 1 is a flowchart of a demodulation method according to an embodiment of the present invention, including:
  • Step 101 The terminal converts the received time domain signal into a baseband frequency domain signal, and groups the REs on the service symbols of the baseband frequency domain signal. Since the source of the interference and the interference type cannot be known in advance, all possible interferences are analyzed. , grouping REs (resource elements) on service symbols subject to interference sources and having the same interference type;
  • the baseband frequency domain signal is composed of RB (Resource Block).
  • Figure 2 shows a resource block.
  • Each RB is composed of REs.
  • One small square in the figure represents one RE, and one service occupies several RBs.
  • the abscissa is a symbol, that is, one column is a symbol, and the symbol is divided into a service symbol and a control symbol, and the symbol including the pilot may be referred to as a pilot symbol, that is, the pilot symbol may be a service symbol, or may be The control symbol, the RE on the service symbol can be further divided into a service RE and a pilot RE.
  • Symbols 1, 5, 8, and 12 in Fig. 2 are pilot symbols.
  • the ordinate is a subcarrier, that is, one behavior is one subcarrier.
  • the service RE and the pilot RE on the service symbol may be separately grouped, and the service RE is divided into one or more service groups, and the pilot RE is divided into one or more pilot groups.
  • the pilot group is used to calculate the average signal power of the pilot group, and the average signal power of the service group is derived according to the ratio of the average signal power of the service and the average signal power of the pilot, according to the average of each group.
  • the power and the average signal power are used to obtain the average noise interference power of each group. According to the average noise interference power of the service group or the average signal power of the service group, the corresponding interference reduction coefficient is obtained.
  • the interference on the service symbols of the baseband frequency domain signal is different.
  • the interference types include: pilot interference of the neighboring cell, interference of the service interference and the control channel of the neighboring cell to the service channel of the serving cell.
  • the number of control symbols of the neighboring cell is not greater than the number of control symbols of the current cell
  • the REs on the non-pilot symbols in the service symbol are interfered
  • the interference on the REs is derived from the same neighboring cell and the interference type is the neighboring cell.
  • the REs in the non-pilot symbols in the service symbol can be grouped.
  • the number of control symbols of the neighboring cell is greater than the number of control symbols of the serving cell, if the number of control symbols of the serving cell is 1, the symbol 2 is divided into a group, and the group is interfered by the control channel of the neighboring cell.
  • the symbols 3 are divided into a group, which is interfered by the control channel of the neighboring cell.
  • the non-pilot REs in the remaining service symbols are grouped into one group, and the group is interfered by the services of the neighboring cells.
  • the interferences are originated from different neighboring cells and the interference type is the pilot or service interference of the neighboring cell, grouped according to the actual situation of the interference, and the group containing the service RE is called a service. group.
  • Step 102 Calculate the interference reduction coefficient of each service group according to the average power of the RE in the service group or the average noise interference power.
  • multiple methods can be used to calculate the interference reduction coefficient, such as the average power of the RE in the service group (refer to application example 2) or the average noise interference power of the RE in the service group (refer to application example 1).
  • the average noise interference power of the service group RE When the average noise interference power of the service group RE is used, the average signal power and the average noise interference power at the pilot are calculated by using the pilot of the local cell, and the ratio of the average signal power of the pilot of the cell to the average signal power of the service is calculated. The average signal power of each service group is calculated, and the average noise interference power is calculated according to the average signal power and the average power.
  • the service RE of the non-pilot symbol is used as a reference, and the corresponding interference reduction coefficient is obtained.
  • the average power of the packets of the service REs with non-pilot symbols is divided by the average power of each service group, and the corresponding interference reduction coefficient is obtained. If there are multiple receiving antennas, the corresponding reduced interference coefficients calculated by multiple receiving antennas may be averaged. As the final coefficient, the received interference reducing coefficients may also be used by multiple receiving antennas.
  • Step 103 Multiply the baseband frequency domain signal and/or channel estimation value corresponding to the service RE by the interference reduction coefficient of the packet where the service RE is located;
  • Step 104 The baseband frequency domain signal and the channel estimation value after the interference reduction processing are sent to the MIMO demodulation module for demodulation.
  • the demodulation method of the present embodiment by taking a two-shot and two-receive MIMO system as an example. It is assumed that the number of control symbols of the serving cell is larger than the number of control symbols of the interfering cell, and the pilot-based service symbol is recorded as class B according to the protocol. The symbol, the service symbol without the pilot is recorded as a class A symbol, as shown in FIG. 3, the method includes the following steps:
  • Step 301 The terminal divides the REs on the service symbols of the baseband frequency domain signal into four groups.
  • the service REs of number 3 and number 0 on the pilot symbols in the service symbols are REs occupied by pilots of the serving cell (referred to as the own cell) of the terminal, and when these REs are interfered, the interference source In the same neighboring cell and the interference type is the pilot or service interference of the neighboring cell, the two numbers of REs are grouped into one group, which is recorded as packet 0, and packet 0 is a pilot group. There are two transmit antennas in the no-neighbor cell, and the adjacent pilots on the same pilot symbol are separated by two sub-carriers. Therefore, when the REs of number 1 and number 4 are interfered, the interference originates from the same neighbor cell and the interference type is Pilot or traffic interference of neighboring cells.
  • the interference originates from the same neighboring cell and the interference type is the pilot or service interference of the neighboring cell. Therefore, the service REs of number 1 and number 4 on the service symbol are divided into one.
  • the group which is recorded as group 1, divides the service REs of numbers 2 and 5 on the service symbol into a group, and records it as group 2, and divides the service REs on the non-pilot symbols on the service symbols into groups, and records them as group 3.
  • packet 1, packet 2, and packet 3 contain service REs, which are called service groups.
  • Step 302 Calculate the average power of each group of REs, where the group number is represented;
  • the calculation of the average power can be done by a known method (the current method is to find the average power as the modulus of the data and then find the mean).
  • Step 303 Calculate the average signal power of packet 0 by using the pilot of the cell. And the average noise interference power N/. ;
  • Step 304 According to ., PS 0 and N/. Calculating the average noise interference power of packet 1, packet 2, and packet 3;
  • Equation (1) and (2) The known power control factor ⁇ and its meaning are shown in equations (1) and (2), where E A is the average signal power of the class A symbol, and the value is equal to 3 ⁇ 4 3 ; the average signal power of the class B symbol Rate; £ ⁇ is the average signal power of the pilot of the cell, and the value is 3 ⁇ 4. equal.
  • Use equation (3) to calculate the average signal power of 3 ⁇ 4 3 which is the type A symbol; calculate the average noise interference power of the class A symbol using equation (4); calculate the group 1 and 2 of the class B symbol using equation ( 5 ) The average noise interference power. And the average signal power collectively referred to as the service.
  • PS 3 p A xPS 0
  • NI 3 PN 3 -PS
  • Step 305 Select a reference group according to the value of the average noise interference power of each group or the number of service REs in the group, and divide the average noise interference power of the reference group by each service The average noise interference power of the group is correspondingly obtained by the interference coefficient of the service group.
  • the group with the smallest value of the average noise interference power is selected as the reference group, or the group containing the most service REs in the packet, or the packet in which the serving cell pilot is located is used as the reference group. If the group with the most business REs is selected as the base group, group 3 is selected as the base group.
  • the calculation method of the interference reduction coefficient is as shown in equation (6). If the packet in which the serving cell pilot is located is used as the reference group, and the packet 0 is selected as the reference group, the calculation method of the interference reduction coefficient is as shown in the formula (7).
  • Step 306 Multiply the baseband frequency domain signal and the channel estimation value corresponding to the RE of each service group by the interference reduction coefficient of the group;
  • Step 307 The baseband frequency domain signal and the channel estimation value after the interference reduction processing are sent to the MIMO demodulation The module performs demodulation.
  • the number of control symbols of the serving cell is 1
  • another example of the present embodiment is described below in conjunction with FIG. 4, including:
  • Step 401 The terminal divides the RE on the service symbol of the baseband frequency domain signal into nine groups.
  • the neighboring cell has one transmit antenna, and the adjacent pilot symbols on the same pilot symbol are separated by five subcarriers. Therefore, the pilot interference of the neighboring cells received by the pilots on the two transmit antennas of the cell cannot be originated from the same neighbor.
  • the cell therefore, divides the pilots on the two transmit antennas of the cell into two groups, which are pilot groups. As shown in FIG. 2, the REs with the same number on the pilot symbols 5, 8, 12 are classified as belonging.
  • all the service REs on symbol 2 are grouped into one group, which is recorded as group 6; all the service REs on symbol 3 are grouped into one group, which is recorded as group 7; the service RE on the remaining non-pilot symbols For group 8, where packet 0 and packet 3 are pilot groups, packet 1, packet 2, packet 4, packet 5, packet 6, packet 7, and packet 8 are recorded as traffic groups.
  • Step 403 Calculate the interference coefficient of the service group on the pilot symbol, such as formula (8) ;
  • step 404 multiplying the baseband frequency domain signal and the channel estimation value corresponding to the RE of each service group by the interference reduction coefficient of the group;
  • Step 405 The baseband frequency domain signal and the channel estimation value after the interference reduction processing are sent to the MIMO demodulation module for demodulation.
  • a demodulation apparatus of the present embodiment including: a resource element grouping module 501, a noise reduction coefficient calculation module 502, a noise reduction module 503, and a demodulation module 504, which are connected to each other, where:
  • the resource element grouping module is configured to group the service REs in the resource elements (RE) on the service symbols in the baseband frequency domain signal, which is called a service group, and send a notification message to the interference reduction coefficient calculation module after completing the grouping;
  • the resource element grouping module groups the service REs in the REs on the service symbols in the baseband frequency domain signal, the service REs on the service symbols that are interfered by the source and have the same interference type are grouped into one group.
  • the interference reduction coefficient calculation module is configured to: after receiving the notification message, calculate a interference reduction coefficient corresponding to each service group, and send the interference reduction coefficient to the interference reduction module;
  • the interference reduction coefficient calculation module may use the following method when calculating the interference reduction coefficient corresponding to each service group, 1) calculating the average power of the service group, and calculating the average signal power of the pilot station by using the pilot of the serving cell of the terminal, Calculating an average signal power of each service group according to the ratio of the average signal power to the average signal power of the service, calculating a corresponding average noise interference power according to the average signal power and the corresponding average power, and selecting a reference group, The average noise interference power of the reference group is divided by the average noise interference power of each service group to obtain the corresponding interference reduction coefficient; 2) calculating the average power of each packet; and the average power of the packet where the service RE of the non-pilot symbol is located Dividing by the average power of each service group, the corresponding interference reduction coefficient of each service group is obtained.
  • the interference reduction coefficient calculation module selects a reference group according to the value of the average noise interference power of each service group, the number of service REs in each service group, or the group in which the serving cell pilot is located.
  • the interference reduction module is configured to multiply the baseband frequency domain signal and/or channel estimation value corresponding to each service group by the interference reduction coefficient corresponding to the packet, and send the baseband frequency domain signal and the channel estimation value to the demodulation module.
  • the demodulation module is configured to demodulate the received baseband frequency domain signal and the channel estimate.
  • the demodulation module is configured to demodulate the received baseband frequency domain signal and the channel estimate.
  • a program to instruct the associated hardware, such as a read-only memory, a magnetic disk, or an optical disk.
  • all or part of the steps of the above embodiments may also be implemented using one or more integrated circuits.
  • each module/unit in the above embodiment may be implemented in the form of hardware or in the form of a software function module. The invention is not limited to any specific form of combination of hardware and software.
  • the demodulation method and apparatus provided by the present invention are based on interference sources and interference types on service symbols.
  • the REs are grouped, and the group including the service REs is recorded as a service group, and the baseband frequency domain signal and/or channel estimation value on the RE in the corresponding service group is multiplied by a drop interference coefficient, and the baseband frequency after the interference reduction is used.
  • Demodulation of the domain signal and the channel estimation value can effectively improve the demodulation performance when the service data is interfered by the neighboring cell, thereby improving the throughput of the system.

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Abstract

本发明提供了一种解调方法及装置，该解调方法包括：终端对基带频域信号中的业务符号上的资源元素（RE）中的业务RE进行分组，称为业务组，计算每个业务组对应的降干扰系数，将每个业务组对应的基带频域信号和/或信道估计值乘以该业务组对应的降干扰系数，并对降干扰处理后的所述基带频域信号和信道估计值进行解调。本发明的技术方案，在终端接收到的业务数据受到干扰的情况下，可以有效地提高解调性能。

Description

一种解调方法及装置
技术领域
本发明涉及正交频分复用 ( Orthogonal Frequency Division Multiplexing, OFDM )技术领域， 尤其涉及一种解调方法及装置。
背景技术
对于无线通信系统， 其发射模式可以是单发多收的 SIMO ( Single Input Multiple Output, 单输入多输出） ， SIMO是针对无线通信的智能天线技术的 一种形式， 釆用单个天线在发射机上发送信号， 多个天线在接收机上接收信 号， 也可以是多发多收的 MIMO ( Multi-input Multi-output, 多输入多输出） ， MIMO是一种用来描述多天线无线通信系统的抽象数学模型， 能利用发射端 的多个天线各自独立发送信号，同时在接收端用多个天线接收并恢复原信息。 现有的 MIMO系统主要分为发射分集和空间复用两种模式。
终端在解调过程中， 即使出现 1 比特错误， 也会导致整个帧错误， 需要 网络侧重新发送， 在解调过程中若出现多次错误， 就要进行多次重发， 造成 网络资源的浪费， 目前， 可以通过改进编码矩阵来提高解调性能， 但效果有 限， 在终端接收到的业务数据受到干扰且干扰类型不同的情况下， 终端的解 调性能下降非常快， 导致业务数据解调错误。 发明内容
本发明要解决的技术问题是提供一种解调方法及装置， 在终端接收到的 业务数据受到干扰的情况下， 提高解调性能。
为解决上述技术问题， 本发明的一种解调方法， 包括：
终端对基带频域信号中的业务符号上的资源元素 （RE ) 中的业务 RE进 行分组， 称为业务组， 计算每个业务组对应的降干扰系数， 将每个业务组对 应的基带频域信号和 /或信道估计值乘以该业务组对应的降干扰系数， 并对降 干扰处理后的所述基带频域信号和信道估计值进行解调。 优选地， 计算每个业务组对应的降干扰系数的方法包括：
计算所述业务组的平均功率， 使用所述终端的服务小区的导频计算该导 频处的平均信号功率， 根据该导频处的平均信号功率与业务的平均信号功率 的比值， 计算每个业务组的平均信号功率， 根据每个业务组的平均信号功率 及相应的平均功率， 计算每个业务组平均噪声干扰功率； 以及
选择基准组， 将该基准组的平均噪声干扰功率分别除以每个业务组的平 均噪声干扰功率， 得到对应的降干扰系数。
优选地， 终端根据每个业务组的平均噪声干扰功率的数值、 每个业务组 中的业务 RE的数量或服务小区导频所在的分组， 选择基准组。
优选地， 计算每个业务组对应的降干扰系数包括：
计算每个业务组的平均功率； 以及 将基准组的平均功率除以每个业务组的平均功率， 得到每个业务组对应 的降干扰系数。
优选地，所述终端对基带频域信号中的业务符号上的 RE中的业务 RE进 行分组时， 将受到干扰的来源且干扰类型相同的业务符号上的业务 RE分为 一组。
优选地， 一种解调装置， 包括： 资源元素分组模块、 降干扰系数计算模 块、 降干扰模块和解调模块， 其中：
所述资源元素分组模块设置为， 对基带频域信号中的业务符号上的资源 元素 （RE ) 中的业务 RE进行分组， 称为业务组， 在完成分组后， 向所述降 干扰系数计算模块发送通知消息；
所述降干扰系数计算模块设置为， 在接收到所述通知消息后， 计算每个 业务组对应的降干扰系数， 并将该降干扰系数发送给所述降干扰模块；
所述降干扰模块设置为， 将每个业务组对应的基带频域信号和 /或信道估 计值乘以该业务组对应的降干扰系数， 并将降干扰处理后的该基带频域信号 和信道估计值发送给所述解调模块；
所述解调模块设置为 ,对接收到的基带频域信号和信道估计值进行解调。 优选地， 所述降干扰系数计算模块是设置为， 在计算每个业务组对应的 降干扰系数时， 计算所述业务组的平均功率， 使用所述终端的服务小区的导 频计算该导频处的平均信号功率， 才艮据该导频处的平均信号功率与业务的平 均信号功率的比值， 计算每个业务组的平均信号功率， 根据每个业务组的平 均信号功率及相应的平均功率， 计算每个业务组的的平均噪声干扰功率， 并 选择基准组， 将该基准组的平均噪声干扰功率分别除以每个业务组的平均噪 声干扰功率， 得到对应的降干扰系数。
优选地， 所述降干扰系数计算模块是设置为， 根据每个业务组的平均噪 声干扰功率的数值、 每个业务组中的业务 RE 的数量或服务小区导频所在的 分组， 选择所述基准组。
优选地， 所述降干扰系数计算模块是设置为， 在计算每个业务组对应的 降干扰系数时， 计算所述每个分组的平均功率； 将基准组的平均功率除以每 个业务组的平均功率， 得到每个业务组对应的降干扰系数。
优选地， 所述资源元素分组模块是设置为， 对基带频域信号中的业务符 号上的 RE中的业务 RE进行分组时，将受到干扰的来源且干扰类型相同的业 务符号上的业务 RE分为一组。
综上所述， 本发明根据干扰来源和干扰类型对业务符号上的 RE (资源元 素 )进行分组， 将包含业务 RE的组记为业务组， 分别对相应业务组中 RE上 的基带频域信号和 /或信道估计值乘以一降干扰系数， 釆用降干扰后的基带频 域信号和信道估计值进行解调， 本发明可以有效地提高业务数据受到邻区干 扰时的解调性能， 进而提高系统的吞吐量。
附图概述
图 1为本发明实施方式解调方法的流程图；
图 2为长期演进（LTE ) 下行中资源块的结构示意图；
图 3为本发明应用示例 1的示意图；
图 4为本发明应用示例 2的示意图；
图 5为本发明实施方式的解调装置的架构图。 本发明的较佳实施方式
本实施方式的思路为， 终端将接收到的时域信号转换成基带频域信号， 并将业务符号中的资源元素分组，由于干扰的来源和干扰类型无法预先获知， 故分析所有可能受到的干扰， 将受到干扰的来源和干扰类型相同的业务符号 中的资源元素分成一个业务组， 结合相应的降干扰系数对每个业务组对应的 基带频域信号和 /或信道估计值进行相应的处理， 提高解调信号的质量， 间接 地提高解调性能， 本实施方式在只有部分业务 RE受到干扰的情况下效果更 加明显。
下面结合附图对本发明的具体实施方式进行说明。
图 1为本实施方式的解调方法的流程， 包括：
步骤 101 : 终端将接收到的时域信号转换为基带频域信号， 对基带频域 信号的业务符号上的 RE进行分组， 由于干扰的来源和干扰类型无法预先获 知， 故分析所有可能受到的干扰， 对受到干扰来源且干扰类型相同的业务符 号上的 RE (资源元素）进行分组；
基带频域信号由 RB ( Resource block, 资源块）组成， 图 2示出了一个 资源块， 每个 RB由 RE组成， 图中一个小方格即代表一个 RE, —个业务占 用若干个 RB, 图 2中， 横坐标为符号， 即一列为一个符号， 符号分为业务符 号和控制符号， 其中包含导频的符号又可称为导频符号， 即导频符号可以是 业务符号， 也可以是控制符号， 业务符号上的 RE又可分为业务 RE和导频 RE。 图 2中符号 1、 5、 8和 12为导频符号。 纵坐标为子载波， 即一行为一 个子载波。
可以对业务符号上的业务 RE和导频 RE分别进行分组， 业务 RE分为一 个或多个业务组， 导频 RE分为一个或多个导频组。 后续计算降干扰系数时， 使用导频组计算导频组的平均信号功率， 根据业务的平均信号功率和导频的 平均信号功率的比值， 推导出业务组的平均信号功率， 根据每组的平均功率 和平均信号功率， 从而得到每组的平均噪声干扰功率， 根据业务组的平均噪 声干扰功率或业务组平均信号功率， 得到相应的降干扰系数。 基带频域信号的业务符号上的 RE所受干扰有所不同， 干扰类型包括： 邻小区的导频干扰， 业务干扰和邻小区的控制信道对服务小区的业务信道的 干扰。 当邻小区的控制符号数不大于本小区的控制符号数时， 业务符号中的 非导频符号上的 RE受到干扰时，这些 RE上的干扰来源于相同邻小区且干扰 类型为邻小区的业务干扰， 可将业务符号中非导频符号中的 RE分为一组。 当邻小区的控制符号数大于服务小区的控制符号数时， 假设服务小区的控制 符号数为 1 , 则将符号 2划分成一组， 该组会受到邻小区的控制信道的干扰。 将符号 3划分成一组， 该组会受到邻小区的控制信道的干扰。 剩余的业务符 号中的非导频的 RE分成一组， 该组受到邻小区的业务的干扰。 导频符号上 的所有 RE受到干扰时， 这些干扰来源于不同邻小区且干扰类型为邻小区的 导频或业务干扰， 根据受干扰的实际情况进行分组， 并将包含业务 RE 的组 称为业务组。
步骤 102: 根据业务组中 RE的平均功率或平均噪声干扰功率， 计算每个 业务组的降干扰系数；
本实施方式中可以釆用多种方法计算降干扰系数， 如釆用业务组中 RE 的平均功率（参考应用示例 2 )或釆用业务组中 RE的平均噪声干扰功率（参 考应用示例 1 ) 。
釆用业务组 RE的平均噪声干扰功率时， 使用本小区导频计算导频处的 平均信号功率及平均噪声干扰功率， 根据本小区导频的平均信号功率和业务 的平均信号功率的比值， 计算出每个业务组的平均信号功率， 根据平均信号 功率及平均功率即可计算出平均噪声干扰功率， 以非导频符号的业务 RE为 基准， 进而得到相应的降干扰系数。
釆用每组 RE的平均功率时，以非导频符号的业务 RE的分组的平均功率 除以每个业务组的平均功率， 得到相应的降干扰系数。 如果有多个接收天线， 可将多个接收天线计算得到的对应降干扰系数进 行平均， 作为最终的系数， 也可以多个接收天线使用各自计算得到的降干扰 系数。
步骤 103: 将业务 RE对应的基带频域信号和 /或信道估计值乘以业务 RE 所在分组的降干扰系数； 步骤 104: 降干扰处理后的基带频域信号和信道估计值送入 MIMO解调 模块进行解调。
应用示例 1 :
下面以两发两收的 MIMO系统为例说明本实施方式的解调方法，假设服 务小区的控制符号数大于干扰小区的控制符号数， 按照协议规定， 将含导频 的业务符号记为 B类符号，不含导频的业务符号记为 A类符号，如图 3所示， 该方法包括如下步骤：
步骤 301 : 终端将基带频域信号的业务符号上的 RE分为四组；
如图 2所示， 业务符号中的导频符号上编号 3和编号 0的业务 RE为终 端的服务小区 （称为本小区） 的导频所占用的 RE, 当这些 RE受到干扰时， 干扰来源于相同邻小区且干扰类型为邻小区的导频或业务干扰， 将这两个编 号的 RE分成一组， 记为分组 0, 分组 0为导频组。 H没邻小区的发射天线有 两根， 同一导频符号上相邻导频 RE间隔两个子载波， 所以当编号 1和编号 4 所占 RE受到干扰时， 干扰来源于相同邻小区且干扰类型为邻小区的导频或 业务干扰。 同理编号 2和编号 5所占 RE所受到干扰时， 干扰来源于相同邻 小区且干扰类型为邻小区的导频或业务干扰， 故将业务符号上编号 1和编号 4的业务 RE分为一组， 记为分组 1 , 将业务符号上编号 2和 5的业务 RE分 为一组， 记为分组 2, 并将业务符号上非导频符号上的业务 RE分为一组， 记 为分组 3 , 其中分组 1、 分组 2和分组 3包含业务 RE, 这些组称为业务组。
步骤 302: 计算每组 RE的平均功率 其中 表示组号；
平均功率的计算可釆用已知方法（现有做法求平均功率为数据的模平方 后求均值） 。
步骤 303: 使用本小区导频计算分组 0的平均信号功率 ¾。和平均噪声干 扰功率 N/。；
步骤 304: 根据 .、 PS0和 N/。计算分组 1、 分组 2和分组 3的平均噪声 干扰功率；
已知功率控制因子 ^和 其含义见公式（1 )和公式（2 ) , 其中， EA 为 A类符号的平均信号功率， 数值与 ¾3相等； 为 B类符号的平均信号功 率； £^为本小区导频的平均信号功率， 数值与 ¾。相等。 使用公式（3)计算 出 ¾3, 也即 A类符号的平均信号功率； 使用公式（4)计算出 A类符号的平 均噪声干扰功率； 利用公式（ 5 )计算 B类符号的分组 1和 2的平均噪声干扰 功率。 和 统称为业务的平均信号功率。
PS3=pAxPS0
NI3=PN3-PS,
NIt =PN1-pBxPS3 步骤 305:根据每个组的平均噪声干扰功率的数值或分组中业务 RE的数 量， 选择基准组， 将基准组的平均噪声干扰功率分别除以每个业务组的平均 噪声干扰功率， 相应地得到业务组的降干扰系数《；
如选择平均噪声干扰功率的数值最小的组作为基准组， 或将分组中包含 业务 RE最多的组， 或服务小区导频所在的分组作为基准组。 如果将业务 RE 最多的组选为基准组， 则选择分组 3为基准组。 降干扰系数的计算方法如公 式（6)。 如果将服务小区导频所在的分组作为基准组， 则选择分组 0为基准 组， 则降干扰系数的计算方法如公式（7)所示。
NI3
i = 1,2,3 公式（ 6 ) i = 1,2,3 公式（ 7 ) 風
步骤 306:将每个业务组的 RE对应的基带频域信号和信道估计值乘以该 组的降干扰系数；
步骤 307: 降干扰处理后的基带频域信号和信道估计值送入 MIMO解调 模块进行解调。
应用示例 2:
两发两收的 MIMO系统为例， 假设服务小区的控制符号数为 1 , 下面结 合图 4对本实施方式的另一示例进行说明， 包括：
步骤 401 : 终端将基带频域信号的业务符号上的 RE分为九组；
假设邻小区的发射天线为 1根， 同一导频符号上相邻导频 RE间隔五个 子载波， 故本小区两个发射天线上的导频受到的邻小区导频干扰不可能来源 于同一个邻小区， 因此， 将本小区的两个发射天线上的导频分为两组， 为导 频组， 如图 2所示， 将导频符号 5 , 8, 12上具有相同编号 的 RE划分为归 属于组 ; 将符号 2上所有的业务 RE分为一组， 记为组 6; 将符号 3上所有 的业务 RE分为一组， 记为组 7; 将剩余的非导频符号上的业务 RE为组 8, 其中分组 0和分组 3为导频组， 分组 1、 分组 2、 分组 4、 分组 5、 分组 6、 分 组 7和分组 8记为业务组。
步骤 402: 计算每组的平均功率 其中 表示组号， , = 0,1,.."6,7,8 ; 步骤 403: 计算导频符号上的业务组的降干扰系数， 如公式（8 ) ；
a / = 1,2,4,5 ,6,7,8 公式（8 )
PN, 步骤 404:将每个业务组的 RE对应的基带频域信号和信道估计值乘以该 组的降干扰系数；
步骤 405: 降干扰处理后的基带频域信号和信道估计值送入 MIMO解调 模块进行解调。
图 5为本实施方式的解调装置，包括:相互连接的资源元素分组模块 501、 降干扰系数计算模块 502、 降干扰模块 503和解调模块 504, 其中：
资源元素分组模块设置为， 对基带频域信号中的业务符号上的资源元素 ( RE ) 中的业务 RE进行分组， 称为业务组， 在完成分组后， 向降干扰系数 计算模块发送通知消息； 资源元素分组模块对基带频域信号中的业务符号上 的 RE中的业务 RE进行分组时，将受到干扰的来源且干扰类型相同的业务符 号上的业务 RE分为一组。 降干扰系数计算模块设置为， 在接收到通知消息后， 计算每个业务组对 应的降干扰系数， 并将该降干扰系数发送给降干扰模块；
降干扰系数计算模块在计算每个业务组对应的降干扰系数时可以釆用如 下方法， 1 )计算业务组的平均功率， 使用终端的服务小区的导频计算该导频 处的平均信号功率， 根据该平均信号功率与业务的平均信号功率的比值， 计 算每个业务组的平均信号功率， 根据该平均信号功率及相应的平均功率， 计 算相应的平均噪声干扰功率， 并选择基准组， 将该基准组的平均噪声干扰功 率分别除以每个业务组的平均噪声干扰功率， 得到对应的降干扰系数； 2 )计 算每个分组的平均功率； 将非导频符号的业务 RE所在分组的平均功率除以 每个业务组的平均功率， 得到每个业务组对应的降干扰系数。 降干扰系数计 算模块根据每个业务组的平均噪声干扰功率的数值、每个业务组中的业务 RE 的数量或服务小区导频所在的分组， 选择基准组。
降干扰模块设置为， 将每个业务组对应的基带频域信号和 /或信道估计值 乘以该分组对应的降干扰系数， 并将该基带频域信号和信道估计值发送给解 调模块。
解调模块设置为， 对接收到的基带频域信号和信道估计值进行解调。 本领域普通技术人员可以理解上述方法中的全部或部分步骤可通过程序 来指令相关硬件完成， 所述程序可以存储于计算机可读存储介质中， 如只读 存储器、 磁盘或光盘等。 可选地， 上述实施例的全部或部分步骤也可以使用 一个或多个集成电路来实现。 相应地， 上述实施例中的各模块 /单元可以釆用 硬件的形式实现， 也可以釆用软件功能模块的形式实现。 本发明不限制于任 何特定形式的硬件和软件的结合。
本发明还可有其它多种实施例，在不背离本发明精神及其实质的情况下， 相应的改变和变形都应属于本发明所附的权利要求的保护范围。
工业实用性 本发明提供的解调方法及装置， 根据干扰来源和干扰类型对业务符号上 的 RE进行分组， 将包含业务 RE的组记为业务组， 分别对相应业务组中 RE 上的基带频域信号和 /或信道估计值乘以一降干扰系数， 釆用降干扰后的基带 频域信号和信道估计值进行解调， 可以有效地提高业务数据受到邻区干扰时 的解调性能， 进而提高系统的吞吐量。

Claims

权 利 要 求 书
1、 一种解调方法， 包括：
终端对基带频域信号中的业务符号上的资源元素 （RE ) 中的业务 RE进 行分组， 称为业务组， 计算每个业务组对应的降干扰系数， 将每个业务组对 应的基带频域信号和 /或信道估计值乘以该业务组对应的降干扰系数， 并对降 干扰处理后的所述基带频域信号和信道估计值进行解调。
2、 如权利要求 1所述的方法， 其中， 所述计算每个业务组对应的降干扰 系数包括：
计算所述业务组的平均功率， 使用所述终端的服务小区的导频计算该导 频处的平均信号功率， 根据该导频处的平均信号功率与业务的平均信号功率 的比值， 计算每个业务组的平均信号功率， 根据每个业务组的平均信号功率 及相应的平均功率， 计算每个业务组平均噪声干扰功率； 以及
选择基准组， 将该基准组的平均噪声干扰功率分别除以每个业务组的平 均噪声干扰功率， 得到对应的降干扰系数。
3、 如权利要求 2所述的方法， 其中， 所述选择基准组包括：
所述终端根据每个业务组的平均噪声干扰功率的数值、 每个业务组中的 业务 RE的数量或服务小区导频所在的分组， 选择所述基准组。
4、 如权利要求 2所述的方法， 其中， 所述计算每个业务组对应的降干扰 系数包括：
计算每个业务组的平均功率； 以及
将基准组的平均功率除以每个业务组的平均功率， 得到每个业务组对应 的降干扰系数。
5、 如权利要求 1、 2、 3或 4所述的方法， 其中：
所述终端对基带频域信号中的业务符号上的 RE中的业务 RE进行分组 时， 将受到干扰的来源且干扰类型相同的业务符号上的业务 RE分为一组。
6、 一种解调装置， 包括： 资源元素分组模块、 降干扰系数计算模块、 降 干扰模块和解调模块， 其中：
所述资源元素分组模块设置为， 对基带频域信号中的业务符号上的资源 元素 （RE ) 中的业务 RE进行分组， 称为业务组， 在完成分组后， 向所述降 干扰系数计算模块发送通知消息；
所述降干扰系数计算模块设置为， 在接收到所述通知消息后， 计算每个 业务组对应的降干扰系数， 并将该降干扰系数发送给所述降干扰模块；
所述降干扰模块设置为， 将每个业务组对应的基带频域信号和 /或信道估 计值乘以该业务组对应的降干扰系数， 并将降干扰处理后的该基带频域信号 和信道估计值发送给所述解调模块；
所述解调模块设置为，对接收到的基带频域信号和信道估计值进行解调。
7、 如权利要求 6所述的装置， 其中：
所述降干扰系数计算模块是设置为， 在计算每个业务组对应的降干扰系 数时， 计算所述业务组的平均功率， 使用所述终端的服务小区的导频计算该 导频处的平均信号功率， 才艮据该导频处的平均信号功率与业务的平均信号功 率的比值， 计算每个业务组的平均信号功率， 根据每个业务组的平均信号功 率及相应的平均功率， 计算每个业务组的的平均噪声干扰功率， 并选择基准 组， 将该基准组的平均噪声干扰功率分别除以每个业务组的平均噪声干扰功 率， 得到对应的降干扰系数。
8、 如权利要求 7所述的装置， 其中：
所述降干扰系数计算模块是设置为， 根据每个业务组的平均噪声干扰功 率的数值、 每个业务组中的业务 RE 的数量或服务小区导频所在的分组， 选 择所述基准组。
9、 如权利要求 7所述的装置， 其中：
所述降干扰系数计算模块是设置为， 在计算每个业务组对应的降干扰系 数时， 计算所述每个分组的平均功率； 将基准组的平均功率除以每个业务组 的平均功率， 得到每个业务组对应的降干扰系数。
10、 如权利要求 6、 7、 8或 9所述的装置， 其中：
所述资源元素分组模块是设置为，对基带频域信号中的业务符号上的 RE 中的业务 RE进行分组时， 将受到干扰的来源且干扰类型相同的业务符号上 的业务 RE分为一组。
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