WO2008148295A1 - Procédé, dispositif et système pour détecter un signal de séquence pilote - Google Patents

Procédé, dispositif et système pour détecter un signal de séquence pilote Download PDF

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Publication number
WO2008148295A1
WO2008148295A1 PCT/CN2008/001027 CN2008001027W WO2008148295A1 WO 2008148295 A1 WO2008148295 A1 WO 2008148295A1 CN 2008001027 W CN2008001027 W CN 2008001027W WO 2008148295 A1 WO2008148295 A1 WO 2008148295A1
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WO
WIPO (PCT)
Prior art keywords
signal
service data
data signal
pilot sequence
received signal
Prior art date
Application number
PCT/CN2008/001027
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English (en)
French (fr)
Inventor
Hongyan Xu
Kewei Wu
Yinxiang Zheng
Yuemin Cai
Original Assignee
Datang Mobile Communications Equipment Co., Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Datang Mobile Communications Equipment Co., Ltd filed Critical Datang Mobile Communications Equipment Co., Ltd
Priority to US12/602,394 priority Critical patent/US8401124B2/en
Priority to JP2010509659A priority patent/JP5094967B2/ja
Priority to EP08757358.0A priority patent/EP2151936B1/en
Publication of WO2008148295A1 publication Critical patent/WO2008148295A1/zh

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B1/00Details 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
    • H04B1/69Spread spectrum techniques
    • H04B1/707Spread spectrum techniques using direct sequence modulation
    • H04B1/7073Synchronisation aspects
    • H04B1/7085Synchronisation aspects using a code tracking loop, e.g. a delay-locked loop
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B1/00Details 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
    • H04B1/69Spread spectrum techniques
    • H04B1/707Spread spectrum techniques using direct sequence modulation
    • H04B1/7097Interference-related aspects
    • H04B1/7103Interference-related aspects the interference being multiple access interference
    • H04B1/7107Subtractive interference cancellation
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B2201/00Indexing scheme relating to details of transmission systems not covered by a single group of H04B3/00 - H04B13/00
    • H04B2201/69Orthogonal indexing scheme relating to spread spectrum techniques in general
    • H04B2201/707Orthogonal indexing scheme relating to spread spectrum techniques in general relating to direct sequence modulation
    • H04B2201/70701Orthogonal indexing scheme relating to spread spectrum techniques in general relating to direct sequence modulation featuring pilot assisted reception

Definitions

  • the present invention relates to the field of communications technologies, and in particular, to a method, device, and system for detecting pilot sequence signals. Background technique
  • pilot sequence signals For synchronization, channel estimation, etc.
  • DwPTS downlink pilot time slots
  • UpPTS uplink pilots
  • the receiving end may detect the pilot sequence signal by using a specific detection algorithm, and perform synchronization and the like according to the detection result.
  • the pilot sequence signal may be overlapped with the service data signal at a certain time for consideration of spectrum utilization or other reasons, that is, the pilot sequence signal and the service data signal are in the same time slot.
  • the pilot sequence signal may cause cross interference on the service data signal in the time slot.
  • the detection performance of the signal is greatly reduced, which seriously affects the communication quality. For example, in a wide coverage condition in a TD-SCDMA system, UpPTS will fall in the time slot TS1 where the service data signal is located due to propagation delay.
  • the UpPTS may be directly moved to the time slot where the service data signal is located, and overlapped with the service data signal. Any processing, UpPTS will be seriously interfered with by the service time slot data signal.
  • One processing method in the prior art is to avoid overlapping transmission as much as possible. For a time division system, a time slot is used to transmit and set a certain guard interval. If it is really impossible to prevent the service data signal from being overlapped and transmitted with the pilot sequence signal, one processing method in the prior art is to ensure the pilot sequence signal and service by reasonably limiting the transmission power. The respective detection performance of the data signals.
  • the UpPTS is directly moved to the time slot where the service data signal is located and transmitted with the service data signal, in order to ensure the UpPTS.
  • Embodiments of the present invention provide a method, a device, and a system for detecting a pilot sequence signal, which are used to suppress interference of a service data signal to a pilot sequence signal, and improve detection performance of a pilot sequence signal.
  • An embodiment of the present invention provides a method for detecting a pilot sequence signal, where the method includes the following steps: when determining that a service data signal in a received signal is correct, extracting the service data signal from the received signal, where the service data signal Locating in the same time slot as the pilot sequence signal in the received signal;
  • the pilot sequence signal is obtained from a received signal after extracting the traffic data signal.
  • the embodiment of the present invention further provides a method for detecting a pilot sequence signal, the method comprising: obtaining a second weighting factor according to a power of a service data signal, a pilot sequence signal, and a noise signal in a received signal, according to the second weighting The factor extracts the service data signal from the received signal, wherein the service data signal and the pilot sequence signal in the received signal are located in the same time slot;
  • the pilot sequence signal is obtained from a received signal after extracting the traffic data signal.
  • the embodiment of the invention further provides a communication device, including:
  • a communication module configured to receive or transmit a signal, where the service data signal in the received signal and the pilot sequence signal are located in the same time slot;
  • a determining module configured to determine whether the service data signal is correct
  • a first processing module configured to: when the determining module determines that the service data signal is correct, Extracting the service data signal from the received signal;
  • a second processing module configured to acquire the pilot sequence signal from the received signal after extracting the service data signal.
  • the embodiment of the invention further provides a communication device, including:
  • a communication module configured to receive or transmit a signal, where the service data signal in the received signal and the pilot sequence signal are located in the same time slot;
  • a first processing module configured to obtain a second weighting factor according to power of the service data signal, the pilot sequence signal, and the noise signal in the received signal
  • a second processing module configured to perform weighting extraction of the service data signal from the received signal according to the second weighting factor
  • a third processing module configured to acquire the pilot sequence signal from the received signal after extracting the service data signal.
  • the embodiment of the invention further provides a communication system, including:
  • a terminal device configured to receive or send a signal, where the service data signal and the pilot sequence signal in the transmitted signal are located in the same time slot;
  • a base station configured to receive a signal sent by the terminal device; and, when determining that the service data signal is correct, extract the service data signal from the received signal, and receive a received signal from the service data signal
  • the pilot sequence signal is obtained.
  • the embodiment of the invention further provides a communication system, including:
  • a terminal device configured to receive or send a signal, where the service data signal and the pilot sequence signal in the transmitted signal are located in the same time slot;
  • a base station configured to receive a signal sent by the terminal device, and obtain a second weighting factor according to a power of the service data signal, the pilot sequence signal, and the noise signal in the received signal, and receive the signal according to the second weighting factor Medium-weighting extracting the service data signal, and acquiring the pilot sequence signal from a received signal after extracting the service data signal.
  • the service data signal and the pilot sequence signal in the received signal are located in the same time slot, when determining that the signal to noise ratio of the service data signal is not less than the first threshold, or And determining, according to a block error rate or a bit error rate of the service data signal in the received signal, that the service data signal is correct, extracting a service data signal from the received signal, and acquiring a pilot sequence signal from the received signal after extracting the service data signal; Or, when the second weighting factor is obtained according to the power of the service data signal, the pilot sequence signal, and the noise signal in the received signal, the service data signal is weighted from the received signal according to the second weighting factor, and The acquisition of the pilot sequence signal in the received signal after extracting the service data signal can effectively suppress the interference of the service data signal on the pilot sequence signal, and greatly improve the detection performance of the pilot sequence signal.
  • FIG. 1 is a flowchart of processing for detecting a pilot sequence signal according to Embodiment 1 of the present invention
  • FIG. 2 is a flowchart of a process for extracting a service data signal from a received signal according to Embodiment 1 of the present invention
  • FIG. 3 is a schematic structural diagram of a communication device according to Embodiment 1 of the present invention.
  • FIG. 4 is a schematic structural diagram of a first processing module according to Embodiment 1 of the present invention
  • FIG. 5 is a schematic structural diagram of a communication system according to Embodiment 1 of the present invention
  • FIG. 6 is a flowchart of processing for detecting a pilot sequence signal according to Embodiment 2 of the present invention.
  • FIG. 7 is a flowchart of processing for detecting a pilot sequence signal according to Embodiment 3 of the present invention.
  • FIG. 8 is a schematic structural diagram of a communication device according to Embodiment 3 of the present invention. Detailed ways
  • the service data signal when the service data signal and the pilot sequence signal in the received signal are located in the same time slot, the service data signal is extracted from the received signal according to the detection performance of the service data signal, and after the service data signal is extracted Acquiring the pilot sequence signal in the received signal can suppress the interference of the service data signal on the pilot sequence signal, and improve the detection performance of the pilot sequence signal.
  • the method of the embodiment of the present invention is based on the following concept:
  • a service data signal is overlapped with a pilot sequence signal
  • the same time slot service data received by the frequency sequence signal The speciality of signal interference, using a reasonable interference suppression algorithm to suppress the interference of the service data signal received by the pilot sequence signal at this time, for example, detecting the service data signal in the received signal, and extracting the service data signal in the received signal.
  • the pilot sequence signal can be obtained from the received signal after the service data signal is extracted.
  • the detection performance of the service data signal may be inaccurate due to interference of the pilot sequence signals of the same time slot.
  • the pilot sequence signals are often short and usually not continuously transmitted, the pilot sequence signals are used for service data.
  • it can be regarded as a kind of sudden interference, which can suppress some interference by the anti-interference ability of the receiver itself, and can also utilize the error correction capability of the channel coding and interleaving process to receive the pilot sequence signal of the service data signal.
  • the interference is further suppressed, and the obtained service data signal is more accurate. If the channel information through which the service data signal passes can be obtained, the interference data recovery method can be used to recover the service data signal, so that the service data signal interference can be cancelled out from the received signal.
  • channel information is easily available in many systems and is therefore highly achievable.
  • the effect that the above-mentioned interference cancellation implementation can achieve depends mainly on the detection performance of the service data signal.
  • the power of the pilot sequence signal is relatively low relative to the power of the service data signal, the detection performance of the traffic data signal is good, and the interference cancellation effect is better.
  • the power of the pilot sequence signal is relatively high relative to the power of the service data signal, the pilot sequence signal has strong interference to the service data signal. If the interference of the pilot sequence signal is not performed during the service data detection process at this time, The effective suppression processing, the error rate of the service data signal detection will be more serious, and the result is that the correlation between the service data signal and the pilot sequence signal after the interference recovery is large, and the interference cancellation is not good at this time. Suppressing interference will cancel out part of the pilot sequence signal.
  • the detection performance of the service data signals of different users may be first measured according to an indicator. If the detection performance is good, the service data signal of the user is extracted from the received signal, and the received signal after the service data signal is subsequently extracted. The pilot sequence signal is obtained. If the detection performance is poor, then the anti-noise effect is not Too good, applying the inaccurate service data signal detection result for the next interference cancellation may have the opposite effect, so the user's service data signal does not participate in the interference recovery or reduce its component in the interference recovery signal.
  • anti-noise performance indicators of service data signals such as one or a combination of signal-to-noise ratio (SNR), bit error rate, and block error rate.
  • SNR signal-to-noise ratio
  • the power of the service data signal, the pilot sequence signal, and the noise signal in the received signal are used to measure the detection performance of the service data signal.
  • the following describes an embodiment of the method for processing a service data signal in a received signal according to different service data signal detection performance indicators to obtain a pilot sequence signal in the received signal.
  • This embodiment is a case where the detection performance of the service data signal is measured by the signal to noise ratio.
  • the signal-to-noise ratio of the service data signal may be compared with the first threshold.
  • the service data signal is subjected to interference cancellation, that is, the service data signal is extracted from the received signal.
  • the first threshold may be set according to system performance requirements, for example, the signal to noise ratio target value (SNR_target) required for system power control may be directly used.
  • a processing flow for detecting a pilot sequence signal is as shown in FIG. 1 , including: Step 100: Receive a signal sent by another device, where a service data signal in the received signal is located in a phase with a pilot sequence signal. At the same time.
  • Step 101 Determine that a signal to noise ratio of the service data signal is not less than a first threshold.
  • Step 102 Extract a service data signal from the received signal.
  • Step 103 Acquire a pilot sequence signal from the received signal after extracting the service data signal.
  • the received signal is ⁇ c, where ⁇ AGC is the signal sequence received by the kath antenna, which is the combined signal of the pilot sequence signal and the traffic data signal.
  • a hard threshold " ⁇ 7 ⁇ can be set. The hard threshold is the first threshold.
  • SNR_gd(k) ⁇ Sd hoid the data detection is considered unreliable and does not participate in interference cancellation.
  • Step 201 Perform interference suppression processing on the demodulated output signal, and various processing methods may be employed herein.
  • Manner 2 After performing channel decoding and deinterleaving on the demodulated signal, performing the same encoding and interleaving as the originating end, and obtaining the originating service data signals ⁇ , ⁇ 1 , 2 , ... ⁇ , so that the originating service data signal can be better.
  • the method can resist the sudden interference caused by the pilot sequence.
  • the mode 2 is more complicated in implementation and may bring a larger processing delay.
  • the user can select the interference suppression processing mode as needed.
  • the originating service data signal d ⁇ - 1 ' 2 ' ⁇ is subjected to the same modulation processing as the originating end, and the modulated signal is reconstructed by using the existing channel estimation result to obtain the recovered service data signal.
  • Step 204 Remove the recovered service data signal from the total received signal, and obtain a received signal after extracting the service data signal:
  • a weighting factor may be set, and the recovered service data signals are weighted and combined according to the weighting factors.
  • interference recovery can be performed on the code channel that needs interference recovery ("* ⁇ 0 ", and then weighted, or the data symbols after modulation can be weighted first, and then interference recovery is performed. In comparison, the latter calculation Less.
  • the interference cancellation is performed as follows.
  • the value of the weighting factor depends on the current data demodulation performance.
  • the weighting factor can be set in various ways. When the signal to noise ratio of the service data signal is not less than the first threshold, the weighting factor is equal to 1. The service data signal is removed directly from the received signal.
  • the first weighting factor may be obtained according to the signal to noise ratio, the first threshold, and the second threshold, and the first weighting factor is restored.
  • the outgoing service data signals are weighted and combined.
  • the second threshold reflects the unreliability of the demodulated signal.
  • the value is low, and may be set according to the performance requirements of the system, or may be set by the user.
  • two threshold values may be set according to the SNR value of the code channel: upper threshold SNR - Threshold _ H/g/z (ie, first threshold) and lower threshold SNR _ Threshold - (ie Second threshold), where SNR _ Threshold _ High > SNR _ Threshold ⁇ Low.
  • SNR_gd(k) ⁇ SNi?—73 ⁇ 4r e . _:. w, then the number is considered unreliable and does not participate in interference cancellation.
  • the first weighting factor is used to perform interference cancellation according to the weighting factor.
  • the first weighting factor can be calculated in a number of ways, for example:
  • the method of linear weighting obtains the first weighting factor:
  • Threshold _ High > SNR_gd(k)>SW i _ Threshold- Low
  • the received signal after the service data signal is extracted may be detected, and the pilot sequence signal is obtained according to the detection result.
  • the detection method here can be the same as the existing detection method, and other detection methods can also be used.
  • the embodiment further provides a communication device, which may be a base station, or another device that can be used to detect a pilot sequence signal.
  • the structure of the communication device is as shown in FIG. 3, and includes: The communication module 300, the determining module 301, the first processing module 302, and the second processing module 303; wherein, the communication module 300 is configured to receive or send a signal, where the service data signal in the received signal and the pilot sequence signal are located at the same time a determining module 301, configured to determine whether a signal to noise ratio of the service data signal is not less than a first threshold; the first processing module 302, configured to: when the determining module 301 determines that a signal to noise ratio of the service data signal is not less than a first threshold, The service data signal is extracted from the received signal; the second processing module 303 is configured to obtain a pilot sequence signal from the received signal after extracting the service data signal.
  • the structure of the first processing module 302 in the embodiment of the present invention is as shown in FIG. 4, and specifically includes: first. processing unit 400, second processing unit 401, third processing unit 402, fourth processing unit 403, and fifth processing unit. 404;
  • the first processing unit 400 is configured to demodulate the received signal;
  • the second processing unit 401 is configured to directly perform the hard decision output on the demodulated signal to obtain the originating service data signal; or, the demodulated After the channel is decoded and deinterleaved, the same coding and interleaving as the originating end are performed to obtain the originating service data signal.
  • the third processing unit 402 is configured to perform the same modulation processing as the originating end of the originating service data signal, and utilize the existing channel.
  • the estimation result reconstructs the modulated signal to obtain the recovered service data signal; the fourth processing unit 403 is configured to combine the recovered service data signals; and the fifth processing unit 404 is configured to remove the received signal.
  • the combined service data signal is obtained as a received signal after the service data signal is extracted.
  • the embodiment of the present invention further provides a communication system, and the structure thereof is as shown in FIG. 5.
  • the communication system includes: a terminal device 500, a base station 501, where the terminal device 500 is used. Receiving or transmitting a signal, where the service data signal and the pilot sequence signal are located in the same time slot; the base station 501 is configured to receive the signal sent by the terminal device 500, and determine the signal noise of the service data signal. When the ratio is not less than the first threshold, the service data signal is extracted from the received signal, and the pilot sequence signal is obtained from the received signal after the service data signal is extracted.
  • This embodiment is a case where the detection performance of the service data signal is measured by the block error rate or the bit error rate.
  • a processing flow for detecting a pilot sequence signal is as shown in FIG. 6, and includes: Step 600: Receive a signal sent by another device, where a service data signal in the received signal is located in a phase with a pilot sequence signal. At the same time.
  • Step 601 Determine that the service data signal is correct according to a block error rate or a bit error rate of the service data signal in the received signal.
  • Step 602 Extract a service data signal from the received signal.
  • Step 603 Acquire a pilot sequence signal from the received signal after extracting the service data signal.
  • the received signal is ⁇ ; c, where is the signal sequence received by the ka-th antenna, which is the combined signal of the pilot sequence signal and the traffic data signal.
  • step 601 before determining that the service data signal is correct according to the block error rate or the bit error rate of the service data signal in the received signal, for the multiple access system, data detection is performed on the user included in the received signal, and the detection result is obtained according to the detection result. Block error rate or bit error rate.
  • the block error rate is calculated according to a cyclic redundancy check (CRC) to determine whether the block data is correct, and if it is correct, interference cancellation is performed on the service data signal.
  • CRC cyclic redundancy check
  • the received signal after the service data signal is extracted may be detected, and the pilot sequence signal is obtained according to the detection result.
  • the detection method here can be the same as the existing detection method, and other detection methods can also be used.
  • the embodiment further provides a communication device, which may be a base station, or other device that can be used to detect a pilot sequence signal, and the structure of the communication device and FIG. 3 in the first embodiment
  • the communication device has the same structure, and includes: a communication module 300, a determination module 301, a first processing module 302, and a second processing module 303.
  • the determining module 301 is configured to be used according to the service data signal.
  • the block error rate or the bit error rate determines whether the service data signal is correct.
  • the first processing module 302 is configured to extract the service data signal from the received signal when the determining module 301 determines that the service data signal is correct.
  • the functions of the communication module 300 and the second processing module, block 303 are the same as in the first embodiment.
  • the structure of the first processing module 302 in the first embodiment is the same as that of the first processing module 302 in the first embodiment.
  • the fourth processing unit 403 does not involve weighted combining to extract the traffic data signal.
  • the embodiment of the present invention further provides a communication system, which has the same structure as that of the communication system in the first embodiment.
  • the base station 501 is configured to receive the terminal.
  • a pilot sequence signal is obtained in the signal.
  • This embodiment is a power-to-service number from a service data signal, a pilot sequence signal, and a noise signal. Measured by signal detection performance.
  • the second weighting factor may be obtained according to the power of the service data signal, the pilot sequence signal, and the noise signal, and the service data signal in the received signal is extracted according to the second weighting factor.
  • a processing flow for detecting a pilot sequence signal is as shown in FIG. 7, and includes: Step 700: Receive a signal sent by another device, where a service data signal in the received signal is located in a phase with a pilot sequence signal. At the same time.
  • Step 701 Obtain a second weighting factor according to the power of the service data signal, the pilot sequence signal, and the noise signal in the received signal.
  • Step 702 Weight the service data signal from the received signal according to the second weighting factor.
  • Step 703 Acquire a pilot sequence signal from the received signal after extracting the service data signal.
  • the received signal is ⁇ cc, where ⁇ GC is the signal sequence received by the ka-th antenna, which is the combined signal of the pilot sequence signal and the service data signal.
  • the processing flow for extracting the service data signal from the received signal in this embodiment is similar to that of the first embodiment. Referring to FIG. 2, details are not described herein again.
  • the second weighting factor needs to be obtained according to the power of the service data signal, the pilot sequence signal, and the noise signal. And extracting the service data signal in the received signal according to the second weighting factor, that is, weighting and combining the restored service data signal according to the second weighting factor.
  • the service data signal, the pilot sequence signal and the noise signal power are:
  • the power of the traffic data signal, the pilot sequence signal and the noise signal can be obtained in various ways, for example, since the pilot sequence signal tends to be short, the service data signal
  • the power can be obtained by directly averaging the received signal without the pilot sequence signal position, or by channel estimation.
  • the noise signal power can be calculated by the system measurement algorithm, and the power of the pilot sequence signal can be based on the first two. And the signal power of the pilot sequence signal transmission position is calculated.
  • the function relationship here can be done in a variety of ways, such as according to formula one:
  • Equation 1 can be seen as a soft threshold
  • Equation 2 can be seen as a hard threshold.
  • the analysis formula 1 when the power of the pilot sequence signal is low and the power of the noise signal is also low, the service data signal is directly extracted from the received signal; and when the power of the pilot sequence signal is much higher than the power of the service data signal , " ⁇ 0, this can be regarded as not performing interference cancellation, which is equivalent to directly detecting the received signal to obtain the pilot sequence signal.
  • the interference cancellation is performed as follows.
  • the received signal after the service data signal is extracted may be detected, and the pilot sequence signal is obtained according to the detection result.
  • the detection method here can be the same as the existing detection method, and other detection methods can also be used.
  • an embodiment of the present invention further provides a communication device, which may be a base station, or other device that can be used to detect a pilot sequence signal.
  • the structure of the communication device is as shown in FIG. a communication module 800, a first processing module 801, a second processing module 802, and a third processing module 803; wherein, the communication module 800 is configured to receive or transmit a signal, where the service data signal and the pilot sequence signal in the received signal.
  • the first processing module 801 is configured to obtain a second weighting factor according to the power of the service data signal, the pilot sequence signal, and the noise signal in the received signal.
  • the second processing module 802 is configured to use the second weighting factor. Weighted extraction industry
  • the third processing module 803 is configured to obtain a pilot sequence signal from the received signal after extracting the service data signal.
  • the structure of the second processing module 802 in the embodiment of the present invention is the same as that of the first processing module 302 in the embodiment.
  • the method further includes: a first processing unit 400, a second processing unit 401, and a third processing unit. 402.
  • the fourth processing unit 403 is configured to perform weighted combining on the recovered service data signals according to the second weighting factor.
  • the embodiment of the present invention further provides a communication system, which has the same structure as that of the communication system in the first embodiment.
  • the base station 501 is configured to receive the terminal device. a signal transmitted by the 500, and obtaining a second weighting factor according to the power of the service data signal, the pilot sequence signal, and the noise signal in the received signal, and weighting the service data signal from the received signal according to the second weighting factor, and extracting the service data from the received data
  • a pilot sequence signal is obtained from the received signal after the signal.
  • the service data signal and the pilot sequence signal in the received signal are located in the same time slot, when determining that the signal to noise ratio of the service data signal is not less than the first threshold, or When the error block rate or the bit error rate of the service data signal in the signal determines that the service data signal is correct, the service data signal is extracted from the received signal, and the pilot sequence signal is obtained from the received signal after the service data signal is extracted; or When the second weighting factor is obtained according to the power of the service data signal, the pilot sequence signal, and the noise signal in the received signal, the service data signal is weighted from the received signal according to the second weighting factor, and the service is extracted from the received signal.
  • the acquisition of the pilot sequence signal in the received signal after the data signal can effectively suppress the interference of the service data signal on the pilot sequence signal, and greatly improve the detection performance of the pilot sequence signal, compared with the prior art method system spectrum utilization rate and system The capacity is higher.

Description

导频序列信号的检测方法、 设备及系统 技术领域
本发明涉及通信技术领域, 尤其涉及导频序列信号的检测方法、 设备及 系统。 背景技术
在移动通信系统中, 常常需要利用导频序列信号进行同步、 信道估计等 操作, 例如, 在 TD-SCDMA系统中, 利用下行导频时隙(DwPTS )信号可以 进行下行同步, 利用上行导频时隙 (UpPTS )信号可以进行上行同步。 接收 端在接收到包含导频序列信号的接收信号之后, 可以采用特定的检测算法检 测到其中的导频序列信号, 并根据检测结果进行同步等操作。
然而, 在实际应用时, 出于对频谱利用率的考虑或其他原因, 导频序列 信号可能会在某一时刻同业务数据信号重叠发送, 即导频序列信号与业务数 据信号位于同一时隙。 例如, 对于具有特殊帧结构的时分系统, 由于传播时 延或其他原因, 导频序列信号可能会在时隙上对业务数据信号造成交叉干扰, 此时若不做处理很可能将导致导频序列信号的检测性能大大降低, 从而严重 影响通信质量。 例如, 在 TD-SCDMA系统中广覆盖条件下, UpPTS就会因 为传播时延而落于业务数据信号所在时隙 TS1。 另外, 在特殊情况下, 如为 了回避远端基站发送的 DwPTS对本基站 UpPTS接收的干扰, 也有可能会将 UpPTS直接移至业务数据信号所在时隙, 同业务数据信号重叠发送, 此时若 不做任何处理, UpPTS就会受到业务时隙数据信号的严重干扰。
业务数据信号与导频序列信号重叠发送时, 可能会导致业务数据信号的 检测和导频序列信号的检测都非常困难, 现有技术中的一种处理方式是, 尽 可能避免二者重叠发送, 如对于时分系统, 采用分时隙发送并设定一定的保 护间隔。 若实在无法避免业务数据信号同导频序列信号重叠发送时, 现有技 术中的一种处理方式是, 通过合理限制发送功率来保证导频序列信号和业务 数据信号各自的检测性能。 例如, 在 TD-SCDMA系统中, 为了回避特殊条件 下远端基站 DwPTS对本基站 UpPTS接收的强干扰, 将 UpPTS直接移至业务 数据信号所在时隙同业务数据信号重叠发送, 此时为了保证 UpPTS的检测性 能, 需要限制与 UpPTS同一时隙的业务数据信号的功率, 从而限制业务数据 信号对 UpPTS的干扰功率水平。
现有技术的不足在于, 无论是增加保护间隔还是限制业务数据信号功率, 都将降低系统频谱利用率, 给系统容量造成损失。 发明内容
本发明实施例提供一种导频序列信号的检测方法、 设备及系统, 用以抑 制业务数据信号对导频序列信号的干扰, 提高导频序列信号的检测性能。
本发明实施例提供一种导频序列信号的检测方法, 该方法包括步骤: 确定接收信号中业务数据信号正确时, 从所述接收信号中提取所述业务 数据信号, 其中, 所述业务数据信号与所述接收信号中的导频序列信号位于 相同时隙;
从提取所述业务数据信号后的接收信号中获取所述导频序列信号。
本发明实施例还提供一种导频序列信号的检测方法, 该方法包括步骤: 根据接收信号中业务数据信号、 导频序列信号、 噪声信号的功率获得第 二加权因子, 按所述第二加权因子从所述接收信号中加权提取所述业务数据 信号, 其中, 所述业务数据信号与所述接收信号中的导频序列信号位于相同 时隙;
从提取所述业务数据信号后的接收信号中获取所述导频序列信号。
本发明实施例还提供一种通信设备, 包括:
通信模块, 用于接收或发送信号, 其中, 接收信号中的业务数据信号与 导频序列信号位于相同时隙;
确定模块, 用于确定所述业务数据信号是否正确;
第一处理模块, 用于在所述确定模块确定所述业务数据信号正确时, 从 所述接收信号中提取所述业务数据信号;
第二处理模块, 用于从提取所述业务数据信号后的接收信号中获取所述 导频序列信号。
本发明实施例还提供一种通信设备, 包括:
通信模块, 用于接收或发送信号, 其中, 接收信号中的业务数据信号与 导频序列信号位于相同时隙;
第一处理模块, 用于根据接收信号中业务数据信号、 导频序列信号、 噪 声信号的功率获得第二加权因子;
第二处理模块, 用于按所述第二加权因子从所述接收信号中加权提取所 述业务数据信号;
第三处理模块, 用于从提取所述业务数据信号后的接收信号中获取所述 导频序列信号。
本发明实施例还提供一种通信系统, 包括:
终端设备, 用于接收或发送信号, 其中, 发送的信号中业务数据信号与 导频序列信号位于相同时隙;
基站, 用于接收所述终端设备发送的信号; 以及, 在确定所述业务数据 信号正确时, 从所述接收信号中提取所述业务数据信号, 并从提取所述业务 数据信号后的接收信号中获取所述导频序列信号。
本发明实施例还提供一种通信系统, 包括:
终端设备, 用于接收或发送信号, 其中, 发送的信号中业务数据信号与 导频序列信号位于相同时隙;
基站, 用于接收所述终端设备发送的信号; 以及, 根据接收信号中业务 数据信号、 导频序列信号、 噪声信号的功率获得第二加权因子, 按所述第二 加权因子从所述接收信号中加权提取所述业务数据信号, 并从提取所述业务 数据信号后的接收信号中获取所述导频序列信号。
本发明实施例中, 接收信号中的业务数据信号与导频序列信号位于相同 时隙的情况下, 在确定所述业务数据信号的信噪比不小于第一阈值时, 或根 据接收信号中业务数据信号的误块率或误码率确定所述业务数据信号正确 时, 从接收信号中提取业务数据信号, 并从提取业务数据信号后的接收信号 中获取导频序列信号; 或者, 在根据接收信号中业务数据信号、 导频序列信 号、 噪声信号的功率获得第二加权因子时, 按所述第二加权因子从所述接收 信号中加权提取所述业务数据信号, 并从提取业务数据信号后的接收信号中 获取导频序列信号, 可以有效的抑制业务数据信号对导频序列信号的干扰, 大幅提高导频序列信号的检测性能。 附图说明
图 1为本发明实施例一中一种检测导频序列信号的处理流程图; 图 2为本发明实施例一中一种从接收信号中提取业务数据信号的处理流 程图;
图 3为本发明实施例一中一种通信设备的结构示意图;
图 4为本发明实施例一中一种第一处理模块的结构示意图; ¾ 图 5为本发明实施例一中一种通信系统的结构示意图;
图 6为本发明实施例二中一种检测导频序列信号的处理流程图;
图 7为本发明实施例三中一种检测导频序列信号的处理流程图;
图 8为本发明实施例三中一种通信设备的结构示意图。 具体实施方式
本发明实施例中 , 接收信号中的业务数据信号与导频序列信号位于相同 时隙的情况下, 根据业务数据信号的检测性能从接收信号中提取业务数据信 号, 并从提取业务数据信号后的接收信号中获取导频序列信号, 可以抑制业 务数据信号对导频序列信号的干扰, 提高导频序列信号的检测性能。
本发明实施例方法基于如下构思: 当业务数据信号同导频序列信号重叠 发送时, 由于导频序列信号所受干扰主要来自业务数据信号, 具有不同于其 它干扰的一些特性, 因此, 可以利用导频序列信号所受的相同时隙业务数据 信号干扰的特殊性, 利用合理的干扰抑制算法抑制此时导频序列信号所受的 业务数据信号干扰, 例如, 对接收信号中的业务数据信号进行检测, 可以提 取出接收信号中的业务数据信号, 进而可以从提取业务数据信号后的接收信 号中获取导频序列信号。
当然, 由于受相同时隙导频序列信号的干扰, 业务数据信号的检测性能 可能不准确, 但由于导频序列信号往往比较短, 并且通常不会连续发送, 因 此, 导频序列信号对业务数据信号而言, 可以视为一种突发性干扰, 可以通 过接收机本身的抗干扰能力抑制一部分干扰, 还可以利用信道编码和交织过 程的纠错能力对业务数据信号所受的导频序列信号干扰进一步进行抑制, 这 样得到的业务数据信号就比较准确。 若能获得业务数据信号通过的信道信息, 则可以利用干扰恢复的方法, 恢复出业务数据信号, 从而可以从接收信号中 抵消掉业务数据信号干扰。 目前, 在很多系统中, 信道信息是很容易得到的, 因此具有很强的可实现性。
另外, 在具体实现时, 上述干扰抵消的实现方式所能达到的效果主要取 决于业务数据信号的检测性能。 当导频序列信号的功率相对于业务数据信号 的功率比较低时, 业务数据信号的检测性能较好, 此时干扰抵消的效果较好。, 当导频序列信号的功率相对于业务数据信号的功率比较高时, 导频序列信号 对业务数据信号的干扰较强 , 若此时在业务数据检测过程中未对导频序列信 号的干扰做有效的抑制处理, 业务数据信号检测的误码率就会较为严重, 其 结果会使干扰恢复之后的业务数据信号与导频序列信号的相关性较大, 此时 干扰抵消不但不会较好的抑制干扰, 反而会抵消掉部分导频序列信号。
基于如上考虑, 从接收信号中提取业务数据信号时, 需考虑业务数据信 号的检测性能。 对于多址系统, 不同用户的业务数据信号由于发送功率不同、 所处环境不同等原因, 业务数据信号的检测性能也各不相同。 此时可以先按 照某种指标对不同用户的业务数据信号的检测性能进行衡量, 若检测性能较 好, 则从接收信号中提取该用户的业务数据信号, 后续从提取业务数据信号 后的接收信号中获取导频序列信号。 若检测性能较差, 则此时抗噪声效果不 太好, 应用不准确的业务数据信号检测结果进行接下来的干扰抵消就可能会 带来相反的效果, 因此该用户的业务数据信号不参与千扰恢复或者减少其在 干扰恢复信号中的分量。
衡量业务数据信号检测性能的指标可以有多种, 主要包括业务数据信号 的抗噪声性能指标, 例如信噪比(SNR )、 误码率、 误块率等之一或组合; 另 外, 也可以由接收信号中的业务数据信号、 导频序列信号、 噪声信号的功率 来衡量业务数据信号检测性能。 下面分别通过实施例来说明根据不同业务数 据信号检测性能指标对接收信号中的业务数据信号进行处理, 获取接收信号 中导频序列信号的方法。
实施例一
本实施例为由信噪比对业务数据信号检测性能进行衡量的情况。 实施中, 可以将业务数据信号的信噪比与第一阈值相比较, 在确定信噪比不小于第一 阈值时, 对业务数据信号进行干扰抵消, 即从接收信号中提取业务数据信号。 这里, 第一阈值可以根据系统性能要求设定, 例如, 可以直接使用系统功控 所需的信噪比目标值( SNR— target )。
本实施例中, 一种检测导频序列信号的处理流程如图 1所示, 包括: 步骤 100、接收其它设备发来的信号, 其中, 接收信号中的业务数据信号 与导频序列信号位于相同时隙。
步骤 101、 确定业务数据信号的信噪比不小于第一阈值。
步骤 102、 从接收信号中提取业务数据信号。
步骤 103、 从提取业务数据信号后的接收信号中获取导频序列信号。
假设接收信号为^ c, 这里 §AGC为第 ka根天线接收到的信号序列, 为导 频序列信号和业务数据信号的合信号。
步骤 101 中, 在确定业务数据信号的信噪比不小于第一阔值前, 对于多 址系统, 需要先对接收信号中所包含的用户做数据检测, 假设第 k个用户检 测输出符号为 4 ,k = 12, ,K , 为所包含的用户数, 进而对接收 «r测输出符 号 , * = 1,2,·.., 进行解调,并对解调输出的各用户的业务数据信号对应于导频 序列信号发送位置的 Ν个数据比特计算信噪比。
例如,假设此时有 Κ个用户,则可以得到 Κ个 SNR—gd(k),k=l,2,...,K值。 后续可以依据对应于某个用户 k的 SNR_gd(k),判定其是否参与干扰抵消。 实 现时可以设定一个硬门限" ^^―7 ^^^ , 该硬门限即为第一阈值, 当某个用 户 k的 SNR值 SNR-gd(k)>= V ?- ^^"^, 则认为其数据检测是可靠的, 可以 参与干扰抵消。 当 SNR—gd(k)<Sd hoid , 则认为其数据检测不可靠, 不参 与干扰抵消。
这就相当于在干扰抵消中运用了一个加权因子:
_ JO; SNR_gd(k)<SNi?一 Threshold
ak ~ {l ; SNR— gd(k)>=SNi? _ Threshold
本实施例中, 一种从接收信号中提取业务数据信号的处理流程如图 2所 示, 包括: 步骤 200、解调接收信号,例如输出 4 ,k = l,2"",K , 为所包含的用户教 ; 步骤 201、对解调输出信号进行干扰抑制处理,这里可采用多种处理方式。 例如: 方式一、 将解调后的信号直接进行硬判决输出, 得到发端业务数 据信号 d = 12,"',^,使得到的发端业务数据信号具有一定的抗干扰和噪声的 能力; 方式二、 将解调后的信号进行信道解码和解交织后, 进行与发端相同 的编码和交织,得到发端业务数据信号^,^12,…^ ,使得到的发端业务数据 信号能够较好抵抗导频序列带来的突发干扰。 方式二比方式一在实现时复杂 度较高, 并且可能带来较大的处理时延。 用户可根据需要选择采用的干扰抑 制处理方式。 步骤 202、 将发端业务数据信号 d^ - 1'2' ^进行与发端相同的调制处 理, 并利用已有的信道估计结果对调制后的信号进行重构, 得到恢复出的业 务数据信号。
这里对于不同的系统, 可以 居其系统特性采用不同的简化方法, 例如, 对于 TD-SCDMA系统而言, 可以用已有的信道估计结果构造系统矩阵, 利用 系统矩阵可以对调制后的信号进行重构, 其中, 调制、 扩频、 加扰的发端处 理和通过信道的过程可以通过与系统矩阵 A("fl)相乘实现, 且可以按照码道恢 复数据,即将发端业务数据信号进行调制,将调制后的数据符号 ), * = 1,H 与系统矩阵 A(i'to)相乘, 即得到恢复出的业务数据信号。 其中 ^:为总的码道数。
步骤 203、 将恢复出的业务数据信号进行合并。 例如, 设第 k个用户干扰恢复后的信号为 .Α«^ = 12,···, ; 则有: 对于 TD-S
Figure imgf000010_0001
(ka)
步骤 204、 从总的接收信号 中去除恢复出的业务数据信号, 获得提取 业务数据信号后的接收信号:
_ .(*") _ Aka)
5u,AGC - ~AGC ~ Sl,AGC
实施中, 在将恢复出的业务数据信号进行合并时, 可以设置一加权因子 按该加权因子将恢复出的业务数据信号进行加权合并。
{ka k)
设第 k个用户干扰恢复后的信号为 ^Α«^ = 12,···, ; 则有:
∑ (katk) 此过程对于不同的系统, 可以根据其系统特性采用不同的简化方法, 例 如, 对于 TD-SCDMA系统: d ∑"*A( w = A(„ )
1 k=\
这里可先对需要干扰恢复("*≠0 )的码道进行干扰恢复, 然后再进行加 权, 也可以先对调制之后的数据符号 进行加权, 然后再进行干扰恢复。 比较而言, 后者计算量更少。 此时在去除接收信号中的业务数据信号时, 采取如下方式进行干扰抵消,
(to) (to) _ (to)
ULAGC― 5AGC MHI,AGC
加权因子"的取值取决于当前数据解调性能,可以釆取多种方式设置加权 因子,当业务数据信号的信噪比不小于第一阈值时,相当于该加权因子等于 1, 此时, 直接从接收信号中去除业务数据信号。
较佳的, 当业务数据信号的信噪比小于第一阈值并且大于第二阈值时, 可以根据信噪比、 第一阈值和第二阔值获得第一加权因子, 按第一加权因子 将恢复出的业务数据信号进行加权合并。 这里, 第二阈值反映解调信号的不 可靠性, 一般此值较低, 可以根据对系统的性能要求设定, 也可以由用户进 行仿真设定。
具体在实现时, 可以根据码道的 SNR值, 设定两个门限值: 上门限值 SNR - Threshold _ H/g/z (即第一阈值)和下门限值 SNR _ Threshold— (即第二阈 值), 其中 SNR _ Threshold _ High > SNR _ Threshold― Low。 若某个用户 k的 SNR值霞― ) >=SNR _ThreMdHiSh ,则认为其数据检; ΐ 测是可靠的, 参与干扰抵消。 当 SNR_gd(k)<=SNi?— 7¾re 。 _:。 w , 则认为其数, 据 检 测 不 可 靠 , 不 参 与 干 扰 抵 消 。 当 SNR _ Threshold _ High > SNR_gd(k)>5Ni? _ Threshold― Low ,则认为其数据有一部分可 靠, 此时可以依据 SNR— gd(k)、 SNR— Threshold— High和 SNR— Threshold—Low 得到第一加权因子, 按照此加权因子进行干扰抵消。
第一加权因子可以按照多种方式计算得到, 例如: 按照线形加权的方法 获得第一加权因子:
SNR _ gd(k) - SNR _ Threshold _ Low
a. = -
SNR― Threshold _ High - SNR _ Threshold _ Low
此时相当于在干扰 4氐消中运用了一个加权因子
0
SNR d(k)=<SV/i― Threshold
SNR _ gd(k) - SNR一 Threshold _ Low
Threshold _ High > SNR_gd(k)>SW i _ Threshold一 Low
SNR _ Threshold― High - SNR― Threshold一 Low
SNR_gd(k)>=續― Threshold
1 从提取业务数据信号后的接收信号中获取导频序列信号时, 可以对提取 业务数据信号后的接收信号进行检测, 根据检测结果获得导频序列信号。 这 里的检测方法可以同于现有检测方法, 也可以采用其它检测方法。
基于同一发明构思, 本实施例还提供了一种通信设备, 该通信设备可以 是基站, 也可以是其它可用于检测导频序列信号的设备, 该通信设备的结构 如图 3所示, 包括: 通信模块 300、 确定模块 301、 第一处理模块 302、 第二 处理模块 303; 其中, 通信模块 300, 用于接收或发送信号, 其中, 接收信号 中的业务数据信号与导频序列信号位于相同时隙; 确定模块 301, 用于确定业 务数据信号的信噪比是否不小于第一阈值; 第一处理模块 302, 用于在确定模 块 301 确定业务数据信号的信噪比不小于第一阈值时, 从接收信号中提取业 务数据信号; 第二处理模块 303, 用于从提取业务数据信号后的接收信号中获 取导频序列信号。
本发明实施例中第一处理模块 302的结构如图 4所示, 具体包括: 第一. 处理单元 400、 第二处理单元 401、 第三处理单元 402、 第四处理单元 403、 第五处理单元 404; 其中, 第一处理单元 400, 用于解调接收信号; 第二处理 单元 401 ,用于将解调后的信号直接进行硬判决输出,得到发端业务数据信号; 或, 将解调后的信号进行信道解码和解交织后, 进行与发端相同的编码和交 织, 得到发端业务数据信号; 第三处理单元 402, 用于将发端业务数据信号进 行与发端相同的调制处理, 并利用已有的信道估计结果对调制后的信号进行 重构, 得到恢复出的业务数据信号; 第四处理单元 403, 用于将恢复出的业务 数据信号进行合并; 第五处理单元 404, 用于从接收信号中去除合并后的业务 数据信号, 获得提取业务数据信号后的接收信号。
其中, 确定模块 301 在确定业务数据信号的信噪比小于第一阔值并且大 于第二阈值后, 第四处理单元 403可以根据信噪比、 第一阈值和第二阔值获 得第一加权因子, 按第一加权因子将恢复出的业务数据信号进行加权合并。
基于同一发明构思, 本发明实施例还提供了一种通信系统, 其结构如图 5 所示, 该通信系统包括: 终端设备 500、 基站 501 ; 其中, 终端设备 500, 用 于接收或发送信号, 其中, 发送的信号中业务数据信号与导频序列信号位于 相同时隙; 基站 501 , 用于接收终端设备 500发送的信号, 以及, 在确定所述 业务数据信号的信噪比不小于第一阔值时, 从接收信号中提取业务数据信号 , 并从提取业务数据信号后的接收信号中获取导频序列信号。
实施例二
本实施例为由误块率或误码率对业务数据信号检测性能进行衡量的情 况。 实施中, 可以根据误块率或误码率判断业务数据信号是否正确, 在确定 业务数据信号正确时, 对业务数据信号进行干扰抵消, 即从接收信号中提取 业务数据信号。
本实施例中, 一种检测导频序列信号的处理流程如图 6所示, 包括: 步骤 600、接收其它设备发来的信号, 其中, 接收信号中的业务数据信号 与导频序列信号位于相同时隙。
步骤 601、根据接收信号中业务数据信号的误块率或误码率确定业务数据 信号正确。
步骤 602、 从接收信号中提取业务数据信号。
步骤 603、 从提取业务数据信号后的接收信号中获取导频序列信号。
假设接收信号为^ ;c, 这里 为第 ka根天线接收到的信号序列, 为导 频序列信号和业务数据信号的合信号。
步骤 601 中, 在根据接收信号中业务数据信号的误块率或误码率确定业 务数据信号正确前, 对于多址系统, 需要先对接收信号中所包含的用户做数 据检测, 根据检测结果获得误块率或误码率。 例如, 假设第 k个用户检测输 出符号为 4 ,k = l,2, ,K , 为所包含的用户数, 进而对接收机检测输出符号 a , ι,2"·· 进行解调,并在对解调输出的数据完成信道译码及解交织等操作 后, 根据循环冗余校验(CRC )计算误块率, 从而判断该块数据是否正确, 若正确则对该业务数据信号进行干扰抵消 , 计算误码率的情况与此类似。
本实施例中一种从接收信号中提取业务数据信号的处理流程与实施例一
u 类似, 参见图 2所示, 这里不再赘述。 但由于本实施例中采用误块率或误码 率对业务数据信号检测性能进行衡量, 因此在确定业务数据信号正确时, 即 从接收信号中直接提取业务数据信号, 不涉及加权合并以提取业务数据信号 的情况。
同样, 从提取业务数据信号后的接收信号中获取导频序列信号时, 可以 对提取业务数据信号后的接收信号进行检测, 根据检测结果获得导频序列信 号。 这里的检测方法可以同于现有检测方法, 也可以釆用其它检测方法。
基于同一发明构思, 本实施例还提供了一种通信设备, 该通信设备可以 是基站, 也可以是其它可用于检测导频序列信号的设备, 该通信设备的结构 与实施例一中图 3所示通信设备的结构相同, 同样包括: 通信模块 300、 确定 模块 301、 第一处理模块 302、 第二处理模块 303; 但在本实施例中, 确定模 块 301 ,用于根据所述业务数据信号的误块率或误码率确定所述业务数据信号 是否正确;第一处理模块 302,用于在确定模块 301确定业务数据信号正确时, 从接收信号中提取业务数据信号。 在本实施例中通信模块 300和第二处理模, 块 303的功能与实施例一中相同。
另外, 本实施例中第一处理模块 302的结构与实施例一中第一处理模块 302的结构相同, 参见图 4所示, 同样包括: 第一处理单元 400、 第二处理单 元 401、 第三处理单元 402、 第四处理单元 403、 第五处理单元 404; 其中各 单元完成的功能与实施例一中相同,这里不再赘述。但其中第四处理单元 403 不涉及加权合并以提取业务数据信号的情况。
基于同一发明构思, 本发明实施例还提供了一种通信系统, 其结构与实 施例一中通信系统的结构相同, 参见图 5所示, 但在本实施例中, 基站 501, 用于接收终端设备 500发送的信号, 以及, 根据接收信号中业务数据信号的 误块率或误码率确定所述业务数据信号正确时, 从接收信号中提取业务数据 信号, 并从提取业务数据信号后的接收信号中获取导频序列信号。
实施例三
本实施例为由业务数据信号、 导频序列信号、 噪声信号的功率对业务数 据信号检测性能进行衡量的情况。 实施中, 可以根据业务数据信号、 导频序 列信号、 噪声信号的功率获得第二加权因子, 按第二加权因子加权提取接收 信号中的业务数据信号。
本实施例中, 一种检测导频序列信号的处理流程如图 7所示, 包括: 步骤 700、接收其它设备发来的信号, 其中, 接收信号中的业务数据信号 与导频序列信号位于相同时隙。
步骤 701、 根据接收信号中业务数据信号、 导频序列信号、 噪声信号的功 率获得第二加权因子。
步骤 702、 按第二加权因子从接收信号中加权提取业务数据信号。
步骤 703、 从提取业务数据信号后的接收信号中获取导频序列信号。 假设接收信号为^ cc, 这里^ GC为第 ka根天线接收到的信号序列, 为导 频序列信号和业务数据信号的合信号。
本实施例中一种从接收信号中提取业务数据信号的处理流程与实施例一 类似, 参见图 2所示, 这里不再赘述。 但由于本实施例中采用业务数据信号、 导频序列信号、 噪声信号的功率对业务数据信号检测性能进行衡量, 因此需 要根据业务数据信号、 导频序列信号、 噪声信号的功率获得第二加权因子, 按第二加权因子加权提取接收信号中的业务数据信号, 即按第二加权因子将 恢复后的业务数据信号进行加权合并。
实施中, 假设业务数据信号、 导频序列信号和噪声信号功率为:
则有第二加权因子:
= f(P„,Pu,Pd) . 这里业务数据信号、 导频序列信号和噪声信号的功率可以利用多种方式 求得, 例如, 由于导频序列信号往往比较短, 因此业务数据信号的功率可以 利用没有导频序列信号位置的接收信号直接求平均功率得到, 也可以利用信 道估计计算得到。 噪声信号功率可以利用系统测量算法计算得到, 而导频序 列信号的功率可以根据前两者和导频序列信号发送位置的信号功率运算得到。 这里的函数关系 可以按照多种方式进行, 如可以按照公式一:
1
a = f(P„, Pu, Pd) =
+ P„ ^ eScalar
, Ka num.
也可以按照公式二:
p + P
{ — >= threshold
0; Pd
d
I ; p + p
― < threshold 这里 e&a/ar为一修正因子, 为天线数, threshold为一 η限。 公式 一可以看做一种软门限的方式, 而公式二可以看作一种硬门限的方式。 分析 公式一可知, 当导频序列信号的功率较低且噪声信号的功率也较低时, 从接收信号中直接提取业务数据信号; 而当导频序列信号的功率比业务数据 信号功率高很多时, "→0, 此时可视为未执行干扰抵消, 相当于直接对接收 信号进行检测以获得导频序列信号。
与实施例一类似, 此时在去除接收信号中的业务数据信号时, 釆取如^ 方式进行干扰抵消。
(ka) _ (ka)一 (ka)
? uAGC = ?AGC ~ ^.\ GC
同样, 从提取业务数据信号后的接收信号中获取导频序列信号时, 可以 对提取业务数据信号后的接收信号进行检测, 根据检测结果获得导频序列信 号。 这里的检测方法可以同于现有检测方法, 也可以采用其它检测方法。
基于同一发明构思, 本发明实施例还提供了一种通信设备, 该通信设备 可以是基站, 也可以是其它可用于检测导频序列信号的设备, 该通信设备的 结构如图 8所示,包括:通信模块 800、第一处理模块 801、第二处理模块 802、 第三处理模块 803; 其中, 通信模块 800, 用于接收或发送信号, 其中, 接收 信号中的业务数据信号与导频序列信号位于相同时隙; 第一处理模块 801 , 用 于根据接收信号中业务数据信号、 导频序列信号、 噪声信号的功率获得第二 加权因子; 第二处理模块 802, 用于按第二加权因子从接收信号中加权提取业 务数据信号; 第三处理模块 803, 用于从提取业务数据信号后的接收信号中获 取导频序列信号。
本发明实施例中第二处理模块 802 的结构与实施例中第一处理模块 302 的结构相同, 参见图 4所示, 同样包括: 第一处理单元 400、 第二处理单元 401、 第三处理单元 402、 第四处理单元 403、 第五处理单元 404; 但在本实施 例中, 第四处理单元 403, 用于按所述第二加权因子将恢复出的业务数据信号 进行加权合并。
基于同一发明构思, 本发明实施例还提供了一种通信系统, 其结构与实 施例一中通信系统结构相同, 参见图 5所示, 但在本实施例中, 基站 501, 用 于接收终端设备 500发送的信号, 以及, 根据接收信号中业务数据信号、 导 频序列信号、 噪声信号的功率获得第二加权因子, 按第二加权因子从接收信 号中加权提取业务数据信号, 并从提取业务数据信号后的接收信号中获取导 频序列信号。
本发明实施例中, 接收信号中的业务数据信号与导频序列信号位于相同 时隙的情况下, 在确定所述业务数据信号的信噪比不小于第一阚值时, 或根, 据接收信号中业务数据信号的误块率或误码率确定所述业务数据信号正确 时, 从接收信号中提取业务数据信号, 并从提取业务数据信号后的接收信号 中获取导频序列信号; 或者, 在根据接收信号中业务数据信号、 导频序列信 号、 噪声信号的功率获得第二加权因子时, 按所述第二加权因子从所述接收 信号中加权提取所述业务数据信号, 并从提取业务数据信号后的接收信号中 获取导频序列信号, 可以有效的抑制业务数据信号对导频序列信号的干扰, 大幅提高导频序列信号的检测性能, 相对于现有技术方法系统频谱利用率和 系统容量较高。
显然, 本领域的技术人员可以对本发明进行各种改动和变型而不脱离本 发明的精神和范围。 这样, 倘若对本发明的这些修改和变型属于本发明权利 要求及其等同技术的范围之内, 则本发明也意图包含这些改动和变型在内。

Claims

权 利 要 求
1、 一种导频序列信号的检测方法, 其特征在于, 该方法包括步骤: 确定接收信号中业务数据信号正确时, 从所述接收信号中提取所述业务 数据信号, 其中, 所述业务数据信号与所述接收信号中的导频序列信号位于 相同时隙;
从提取所述业务数据信号后的接收信号中获取所述导频序列信号。
2、 如权利要求 1所述的方法, 其特征在于, 在接收信号中业务数据信号 的信噪比不小于第一阈值时, 确定接收信号中业务数据信号正确;
或, 根据接收信号中业务数据信号的误块率或误码率, 确定接收信号中 业务数据信号正确。
3、 如权利要求 2所述的方法, 其特征在于, 从所述接收信号中提取所述 业务数据信号包括步骤:
解调所述接收信号;
将解调后的信号直接进行硬判决输出, 得到发端业务数据信号; 或, 将 解调后的信号进行信道解码和解交织后, 进行与发端相同的编码和交织, 待 到发端业务数据信号;
将所述发端业务数据信号进行与发端相同的调制处理, 并用已有的信道 估计结果对调制后的信号进行重构, 得到恢复出的业务数据信号;
将恢复出的业务数据信号进行合并;
从所述接收信号中去除合并后的业务数据信号, 获得提取所述业务数据 信号后的接收信号。
4、 如权利要求 3所述的方法, 其特征在于, 用所述已有的信道估计结果 构造系统矩阵, 利用系统矩阵对调制后的信号进行重构。
5、 如权利要求 3所述的方法, 其特征在于, 所述业务数据信号的信噪比 小于所述第一阔值并且大于第二阈值时, 根据所述信噪比、 第一阈值和第二 阁值获得第一加权因子, 按所述第一加权因子将恢复出的业务数据信号进行 加权合并。
6、 如权利要求 1至 5任一项所述的方法, 其特征在于, 从提取所述业务 数据信号后的接收信号中获取所述导频序列信号是指:
对提取所述业务数据信号后的接收信号进行检测 , 根据检测结果获得所 述导频序列信号。
7、 一种导频序列信号的检测方法, 其特征在于, 该方法包括步骤: 根据接收信号中业务数据信号、 导频序列信号、 噪声信号的功率获得第 二加权因子, 按所述第二加权因子从所述接收信号中加权提取所述业务数据 信号, 其中, 所述业务数据信号与所述接收信号中的导频序列信号位于相同 时隙;
从提取所述业务数据信号后的接收信号中获取所述导频序列信号。
8、 如权利要求 7所述的方法, 其特征在于, 从所述接收信号中提取所述 业务数据信号包括步骤:
解调所述接收信号;
将解调后的信号直接进行硬判决输 '出, 得到发端业务数据信号; 或, 将 解调后的信号进行信道解码和解交织后, 进行与发端相同的编码和交织, 得 到发端业务数据信号;
将所述发端业务数据信号进行与发端相同的调制处理, 并用已有的信道 估计结果对调制后的信号进行重构, 得到恢复出的业务数据信号;
按所述第二加权因子将恢复出的业务数据信号进行加权合并;
从所述接收信号中去除合并后的业务数据信号, 获得提取所述业务数据 信号后的接收信号。
9、 如权利要求 8所述的方法, 其特征在于, 用所述已有的信道估计结果 构造系统矩阵, 利用系统矩阵对调制后的信号进行重构。
10、 如权利要求 7、 8或 9所述的方法, 其特征在于, 从提取所述业务数 据信号后的接收信号中获取所述导频序列信号是指:
对提取所述业务数据信号后的接收信号进行检测, 根据检测结果获得所 述导频序列信号。
11、 一种通信设备, 其特征在于, 包括:
通信模块, 用于接收或发送信号, 其中, 接收信号中的业务数据信号与 导频序列信号位于相同时隙;
确定模块, 用于确定所述业务数据信号是否正确;
第一处理模块, 用于在所述确定模块确定所述业务数据信号正确时, 从 所述接收信号中提取所述业务数据信号;
第二处理模块, 用于从提取所述业务数据信号后的接收信号中获取所述 导频序列信号。
12、 如权利要求 11所述的设备, 其特征在于, 所述确定模块进一步用于 在接收信号中业务数椐信号的信噪比不小于第一阔值时, 确定接收信号中业 务数据信号正确;
或, 根据接收信号中业务数据信号的误块率或误码率, 确定接收信号中 业务数据信号正确。
13、 如权利要求 12所述的设备, 其特征在于, 所述第一处理模块包括: 第一处理单元, 用于解调所述接收信号;
第二处理单元, 用于将解调后的信号直接进行硬判决输出, 得到发端业 务数据信号; 或, 将解调后的信号进行信道解码和解交织后, 进行与发端相 同的编码和交织, 得到发端业务数据信号;
第三处理单元, 用于将所述发端业务数据信号进行与发端相同的调制处 理, 并用已有的信道估计结果对调制后的信号进行重构, 得到恢复出的业务 数据信号;
第四处理单元, 用于将恢复出的业务数据信号进行合并;
第五处理单元, 用于从所述接收信号中去除合并后的业务数据信号, 获 得提取所述业务数据信号后的接收信号。
14、 如权利要求 13所述的设备, 其特征在于, 所述确定模块确定所述业 务数据信号的信噪比小于所述第一阈值并且大于第二阈值时, 所述第四处理 单元根据所述信噪比、 第一阈值和第二阈值获得第一加权因子, 按所述第一 加权因子将恢复出的业务数据信号进行加权合并。
15、 一种通信设备, 其特征在于, 包括:
通信模块, 用于接收或发送信号, 其中, 接收信号中的业务数据信号与 导频序列信号位于相同时隙;
第一处理模块, 用于根据接收信号中业务数据信号、 导频序列信号、 噪 声信号的功率获得第二加权因子;
第二处理模块, 用于按所述第二加权因子从所述接收信号中加权提取所 述业务数据信号;
第三处理模块, 用于从提取所述业务数据信号后的接收信号中获取所述 导频序列信号。
16、 如权利要求 15所述的设备, 其特征在于, 所述第二处理模块包括: 第一处理单元, 用于解调所述接收信号; 第二处理单元, 用于将解调后的信号直接进行硬判决输出, 得到发 业 务数据信号; 或, 将解调后的信号进行信道解码和解交织后, 进行与发端相 同的编码和交织, 得到发端业务数据信号;
第三处理单元, 用于将所述发端业务数据信号进行与发端相同的调制处 理, 并用已有的信道估计结果对调制后的信号进行重构, 得到恢复出的业务 数据信号;
第四处理单元, 用于按所述第二加权因子将恢复出的业务数据信号进行 加权合并;
第五处理单元, 用于从所述接收信号中去除合并后的业务数据信号, 获 得提取所述业务数据信号后的接收信号。
17、 一种通信系统, 其特征在于, 包括:
终端设备, 用于接收或发送信号, 其中, 发送的信号中业务数据信号与 导频序列信号位于相同时隙;
基站, 用于接收所述终端设备发送的信号; 以及, 在确定所述业务数据 信号正确时, 从所述接收信号中提取所述业务数据信号, 并从提取所述业务 数据信号后的接收信号中获取所述导频序列信号。
18、 一种通信系统, 其特征在于, 包括:
终端设备, 用于接收或发送信号, 其中, 发送的信号中业务数据信号与 导频序列信号位于相同时隙;
基站, 用于接收所述终端设备发送的信号; 以及, 根据接收信号中业务 数据信号、 导频序列信号、 噪声信号的功率获得第二加权因子, 按所述第二 加权因子从所述接收信号中加权提取所述业务数据信号, 并从提取所述业务 数据信号后的接收信号中获取所述导频序列信号。
PCT/CN2008/001027 2007-05-31 2008-05-27 Procédé, dispositif et système pour détecter un signal de séquence pilote WO2008148295A1 (fr)

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JP2010509659A JP5094967B2 (ja) 2007-05-31 2008-05-27 パイロットシーケンス信号を検出する方法、設備及びシステム
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JP5094967B2 (ja) 2012-12-12
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JP2010528539A (ja) 2010-08-19
US8401124B2 (en) 2013-03-19
EP2151936B1 (en) 2014-09-17
EP2151936A4 (en) 2012-09-12
KR101209135B1 (ko) 2012-12-06
US20100189165A1 (en) 2010-07-29
CN101316115B (zh) 2015-02-18
CN101316115A (zh) 2008-12-03

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