CN104753831B - Method and device for detecting number of antenna ports of adjacent cell - Google Patents
Method and device for detecting number of antenna ports of adjacent cell Download PDFInfo
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Abstract
The invention provides a method for detecting the number of adjacent cell antenna ports, which comprises the following steps: obtaining frequency domain channel estimation according to the receiving signal at the frequency domain RS and the reference signal at the local RS; carrying out inverse discrete Fourier transform on the frequency domain channel estimation to obtain a time domain channel estimation; calculating the time domain signal-to-noise ratio of each adjacent cell antenna port according to the time domain channel estimation; and judging the number of the antenna ports of the adjacent cells according to the time domain signal-to-noise ratios of the antenna ports of the adjacent cells. The invention detects the exact number of the antenna ports of the current interference adjacent cell in real time, provides necessary prior information for the interference elimination and other processing of CRS of the adjacent cell, and is beneficial to further improving the same frequency anti-interference capability of the terminal.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a method and an apparatus for detecting the number of neighboring cell antenna ports.
Background
In an LTE system, for co-channel Interference, the prior art adopts a method of Inter-base station resource coordination, which is referred to as Inter-Cell Interference coordination (ICIC). The basic idea is to control inter-cell interference by managing radio resources, and is a multi-cell radio resource management scheme considering conditions such as resource usage and load in a plurality of cells.
However, the ICIC technique can only solve the interference of the inter-cell traffic data well, and cannot solve the mutual interference of the inter-cell Reference Signals (RSs). For a typical Cell Reference Signal (CRS), the base station side transmits full bandwidth, and for such interference signals, the current interference coordination technology cannot solve.
In an LTE wireless communication system, in the same-frequency multi-cell interference elimination technology, the number of adjacent cell antenna ports needs to be known at first, and the information is the prior information necessary for adjacent cell interference elimination. In general, with the cell number (CellID) known, the local CRS signal of the cell can be obtained, so as to reconstruct the CRS received signal of the cell and perform interference cancellation. Before reconstruction and elimination of interference signals, the problem of detecting the number of antenna ports of adjacent cells is urgently solved, and then interference elimination can be correctly carried out.
Disclosure of Invention
The invention aims to provide a method and a device for detecting the number of antenna ports of a neighboring cell, which aim to solve the problem that the existing interference coordination technology cannot solve the mutual interference of reference signals among cells.
In order to solve the above technical problem, the present invention provides a method for detecting the number of neighboring cell antenna ports, comprising:
obtaining frequency domain channel estimation according to the receiving signal at the frequency domain RS and the reference signal at the local RS;
carrying out inverse discrete Fourier transform on the frequency domain channel estimation to obtain a time domain channel estimation;
calculating the time domain signal-to-noise ratio of each adjacent cell antenna port according to the time domain channel estimation;
and judging the number of the antenna ports of the adjacent cells according to the time domain signal-to-noise ratios of the antenna ports of the adjacent cells.
Preferably, in the method for detecting the number of antenna ports in the neighboring cell, in the step of obtaining the frequency domain channel estimation, a least square method is adopted to obtain the frequency domain channel estimation according to the received signal at the frequency domain reference signal RS and the reference signal at the local reference signal.
Preferably, in the method for detecting the number of antenna ports in the neighboring cell, in the step of performing inverse discrete fourier transform on the frequency domain channel estimation to obtain the time domain channel estimation, the frequency domain channel estimation is subjected to zero padding to pad the dimension of the frequency domain channel estimation to an integer power of 2, and then the frequency domain channel estimation is subjected to inverse discrete fourier transform of the integer power of 2 to obtain the time domain channel estimation.
Preferably, in the method for detecting the number of the antenna ports of the neighboring cell, in the step of judging the number of the antenna ports of the neighboring cell according to the time domain signal-to-noise ratios of all the antenna ports of the neighboring cell, the time domain signal-to-noise ratios of the antenna ports of the neighboring cell are calculated and then compared with a preset judgment threshold of the number of the antenna ports of the neighboring cell, so as to judge the number of the antenna ports of the neighboring cell.
Preferably, in the method for detecting the number of the neighboring cell antenna ports, the number of the neighboring cell antennas is four, and in the step of judging the number of the neighboring cell antenna ports according to the time domain signal-to-noise ratio of all the neighboring cell antenna ports,
comparing and judging the time domain signal-to-noise ratio of the antenna port 2 with the time domain signal-to-noise ratio of the antenna port 0, and if the antenna port 2 exists, judging that the number of the antenna ports in the adjacent region is 4;
otherwise, comparing and judging the time domain signal-to-noise ratio of the antenna port 1 with the time domain signal-to-noise ratio of the antenna port 0, and if the antenna port 1 exists, judging that the number of the antenna ports in the adjacent region is 2; otherwise, the number of the antenna ports of the adjacent region is 1.
Correspondingly, the invention also provides a device for detecting the number of antenna ports of the neighboring cell, which comprises:
the frequency domain channel estimation unit is used for obtaining frequency domain channel estimation according to the receiving signal at the frequency domain RS and the reference signal at the local RS;
the discrete Fourier inverse change transformation unit is used for carrying out discrete Fourier inverse change on the frequency domain channel estimation to obtain time domain channel estimation;
the signal-to-noise ratio calculation unit is used for calculating the time domain signal-to-noise ratio of each adjacent cell antenna port according to the time domain channel estimation;
and the antenna port number judging unit is used for judging the number of the antenna ports of the adjacent regions according to the time domain signal-to-noise ratios of the antenna ports of the adjacent regions.
Preferably, in the apparatus for detecting the number of antenna ports in the neighboring cell, in the frequency domain channel estimation unit, a least square method is used to obtain the frequency domain channel estimation according to the received signal at the frequency domain reference signal RS and the reference signal at the local reference signal.
Preferably, in the apparatus for detecting a number of antenna ports of a neighboring cell, in the discrete fourier inverse transform unit, the frequency domain channel estimation is zero-padded to complement the dimension of the frequency domain channel estimation to an integer power of 2, and then the frequency domain channel estimation is subjected to discrete fourier inverse transform to the integer power of 2, so as to obtain the time domain channel estimation.
Preferably, in the apparatus for detecting the number of antenna ports of the neighboring cell, in the antenna port number determining unit, the time domain signal-to-noise ratio of the antenna port of the neighboring cell is calculated and then compared with a preset antenna port number determining threshold, so as to determine the number of antenna ports of the neighboring cell.
The method and the device for detecting the number of the antenna ports of the adjacent cell have the following beneficial effects: the invention detects the exact number of the antenna ports of the current interference adjacent cell in real time, provides necessary prior information for the interference elimination and other processing of CRS of the adjacent cell, and is beneficial to further improving the same frequency anti-interference capability of the terminal.
Drawings
FIG. 1 is a schematic diagram of an apparatus for detecting the number of antenna ports in a neighboring cell according to the present invention;
FIG. 2 is a diagram illustrating a method for detecting the number of antenna ports in a neighboring cell according to the present invention;
fig. 3 is a schematic diagram of a detection flow of a method for detecting the number of neighboring cell antenna ports according to embodiment 1 of the present invention.
Detailed Description
The following describes the method and apparatus for detecting the number of neighboring antenna ports according to the present invention in detail with reference to the accompanying drawings and specific embodiments. Advantages and features of the present invention will become apparent from the following description and from the claims. It is to be noted that the drawings are in a very simplified form and are not to precise scale, which is merely for the purpose of facilitating and distinctly claiming the embodiments of the present invention.
With the development of wireless communication technology and the rise of LTE (Long Term Evolution) communication systems in the world, wireless resources are increasingly strained. In order to improve the spectrum utilization rate of the LTE system, the same-frequency networking becomes an effective solution. In the LTE system of the same-frequency networking, each local cell has a plurality of other cells using the same frequency as that of the local cell, thereby forming the same-frequency interference with each other.
In the LTE system, channel estimation is the basis of key technologies such as MIMO (multiple input multiple output) detection, measurement, feedback, etc. In general, LTE uses a Reference Signal (RS) for channel estimation. These RSs are determined for a fixed Cell ID, that is, for the RS, which is the determined co-channel interference signal, we can reconstruct and eliminate. However, before reconstructing and canceling the interference, it is first required to detect whether the interference exists, how many antenna ports exist in the interfering cell, and the like.
Please refer to fig. 1, which is a schematic diagram of an apparatus for detecting the number of neighboring antenna ports according to the present invention. As shown in fig. 1, the present invention provides a device for detecting the number of antenna ports of a neighboring cell, which solves the problem of how to detect the number of antenna ports of the neighboring cell in real time, and the device for detecting the number of antenna ports of the neighboring cell includes: a frequency domain channel estimation unit 101, a discrete fourier inverse transformation unit 102, a signal-to-noise ratio calculation unit 103 and an antenna port number judgment unit 104;
the frequency domain channel estimation unit 101 is configured to obtain a frequency domain channel estimation according to a received signal at a frequency domain RS and a reference signal at a local RS;
the inverse discrete fourier transform unit 102 is configured to perform inverse discrete fourier transform on the frequency domain channel estimate to obtain a time domain channel estimate;
the signal-to-noise ratio calculation unit 103 is configured to calculate a time domain signal-to-noise ratio of each neighboring cell antenna port according to the time domain channel estimation;
the antenna port number determining unit 104 is configured to determine the number of neighboring cell antenna ports according to the time domain signal-to-noise ratios of all neighboring cell antenna ports.
Accordingly, please refer to fig. 2, which is a schematic diagram of a method for detecting the number of neighboring antenna ports according to the present invention. As shown in fig. 2, the present invention provides a method for detecting the number of antenna ports in a neighboring cell, including:
s201: obtaining frequency domain channel estimation according to the receiving signal at the frequency domain RS and the reference signal at the local RS;
s202: carrying out inverse discrete Fourier transform on the frequency domain channel estimation to obtain a time domain channel estimation;
s203: calculating the time domain signal-to-noise ratio of each adjacent cell antenna port according to the time domain channel estimation;
s204: and judging the number of the antenna ports of the adjacent cells according to the time domain signal-to-noise ratios of the antenna ports of the adjacent cells.
[ example 1 ]
Taking a typical mainstream two-transmit and two-receive antenna configuration in LTE as an example, the description is made for one OFDM (Orthogonal Frequency Division Multiplexing) symbol with RS. The specific method comprises the following steps:
s201: from received signals at the frequency domain RSAnd reference signals at local RSObtaining frequency domain channel estimates
In a preferred embodiment, the frequency domain channel estimation is performed using the LS (Least squares) algorithm.
The LS estimation is shown in the following disclosure:wherein,is the result of the frequency domain channel estimation;is the received signal at the frequency domain RS;for the reference signal at the local RS, r is the receiving antenna number, p is the transmitting antenna port number, r belongs to {0,1}, and p belongs to {0,1 }.
Further, in the above-mentioned case,andall are vectors, the dimension is the number of RS of a single antenna port in the current symbol, and is related to the system bandwidth. In particular, in the present embodiment, assuming that the system bandwidth is 20M, the number of RSs for a single antenna port is 200,
namely:
s202: estimating the frequency domain channelPerforming Inverse Discrete Fourier Transform (IDFT) to obtain time domain channel estimate
In a broadband system, a frequency domain may have strong frequency selective fading, so that the number of antenna ports in a neighboring cell is difficult to judge from the frequency domain. Therefore, the frequency domain channel estimation needs to be transformed to the time domain by IDFT and then further determined.
In a preferred embodiment, the present embodiment implements IDFT rapidly by IFFT (Inverse Fast Fourier Transform).
In particularIn this step, the frequency domain channel is first estimatedEstimating the frequency domain channel by zero filling methodIs complemented to an integer power of 2; preferably, in this embodiment, the dimension is complemented to 256 to obtain the channel estimate ofWherein,
then, the frequency domain channel is estimatedMaking IFFT conversion of 256 points to obtain time domain channel impulse response
S203: calculating the time domain signal-to-noise ratio SNR of each neighboring cell antenna port according to the time domain channel estimation(p)；
Specifically, in this step, the channel impulse response is determined according to the time domainThe signal power and the noise power of the antenna ports are calculated separately.
First, calculateTap power ofComprises the following steps:
specifically, in the present embodiment, the maximum tap power is set as the signal power. Signal powerCalculated according to the following formula:
then, the power average of the last 128 taps is taken as the noise power, and the second half of the time domain channel impulse response is considered as the noise tap (the selection of the noise tap may be affected by tap energy leakage, early reception, etc., and a corresponding position adjustment is needed).
Noise powerCalculated according to the following formula:
finally, the SNR of the p antenna port on the r receiving antenna is defined(r,p)Calculated according to the following formula:
further, the snr of two receiving antennas at the same antenna port is averaged:
SNR(p)＝(SNR(0,p)+SNR(1,p))/2
s204: and judging the number of the antenna ports of the adjacent regions according to the time domain signal-to-noise ratios (SNR (p)) of the antenna ports of all the adjacent regions.
Specifically, in this step, the SNR of the antenna port time domain signal-to-noise ratio obtained in step S203 is used as the SNR(p)The judgment is made according to the following formula:
wherein α is a threshold for determining the number of antenna ports, and is set according to the experimental requirements, and in this embodiment, 10dB is selected.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. For example, the four-transmitting and four-receiving antenna is taken as an example for description, and the detection method is the same as the two-transmitting and two-receiving antenna, but the detection flow is different. Here, the detection procedure of the four-transmit four-receive antenna is specifically described, and the detection method is not described in detail.
When detecting the four antenna ports, firstly calculating the signal-to-noise ratio of the antenna port 2 (or calculated by combining the antenna port 3), and comparing and judging with the antenna port 0. If the antenna port 2 exists, the antenna port is judged to be 4 antenna ports; otherwise, the signal-to-noise ratio of the antenna port 1 is calculated and compared with the antenna port 0 for judgment. If the antenna port 1 exists, the antenna port is judged to be 2, otherwise, the antenna port is judged to be 1.
Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The above description is only for the purpose of describing the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention, and any variations and modifications made by those skilled in the art based on the above disclosure are within the scope of the appended claims.
Claims (7)
1. A method for detecting the number of antenna ports in a neighboring cell is characterized by comprising the following steps:
obtaining frequency domain channel estimation according to the receiving signal at the frequency domain RS and the reference signal at the local RS;
carrying out inverse discrete Fourier transform on the frequency domain channel estimation to obtain a time domain channel estimation;
calculating the time domain signal-to-noise ratio of each adjacent cell antenna port according to the time domain channel estimation;
judging the number of the antenna ports of the adjacent cells according to the time domain signal-to-noise ratios of the antenna ports of the adjacent cells;
in the step of judging the number of the antenna ports of the adjacent cell according to the time domain signal-to-noise ratios of all the antenna ports of the adjacent cell, the time domain signal-to-noise ratios of the antenna ports of the adjacent cell are calculated and then are compared with a preset antenna port number judgment threshold, so that the number of the antenna ports of the adjacent cell is judged.
2. The method for detecting the number of neighboring cell antenna ports as claimed in claim 1, wherein in the step of obtaining the frequency domain channel estimation, the frequency domain channel estimation is obtained by using a least square method according to the received signal at the frequency domain reference signal RS and the reference signal at the local reference signal.
3. The method as claimed in claim 1, wherein in the step of obtaining the time domain channel estimate by performing inverse discrete fourier transform on the frequency domain channel estimate, the frequency domain channel estimate is zero-padded to complement the dimension of the frequency domain channel estimate to an integer power of 2, and then the frequency domain channel estimate is subjected to inverse discrete fourier transform to the integer power of 2 to obtain the time domain channel estimate.
4. The method for detecting the number of neighboring antenna ports as claimed in any of claims 1-3, wherein the number of neighboring antennas is four, and in the step of determining the number of neighboring antenna ports according to the time-domain SNR of all neighboring antenna ports,
comparing and judging the time domain signal-to-noise ratio of the antenna port 2 with the time domain signal-to-noise ratio of the antenna port 0, and if the antenna port 2 exists, judging that the number of the antenna ports in the adjacent region is 4;
otherwise, comparing and judging the time domain signal-to-noise ratio of the antenna port 1 with the time domain signal-to-noise ratio of the antenna port 0, and if the antenna port 1 exists, judging that the number of the antenna ports in the adjacent region is 2; otherwise, the number of the antenna ports of the adjacent region is 1.
5. An apparatus for detecting the number of antenna ports in a neighboring cell, comprising:
the frequency domain channel estimation unit is used for obtaining frequency domain channel estimation according to the receiving signal at the frequency domain RS and the reference signal at the local RS;
the discrete Fourier inverse change transformation unit is used for carrying out discrete Fourier inverse change on the frequency domain channel estimation to obtain time domain channel estimation;
the signal-to-noise ratio calculation unit is used for calculating the time domain signal-to-noise ratio of each adjacent cell antenna port according to the time domain channel estimation;
the antenna port number judging unit is used for judging the number of the antenna ports of the adjacent regions according to the time domain signal-to-noise ratios of the antenna ports of the adjacent regions;
in the antenna port number judging unit, the time domain signal-to-noise ratio of the antenna ports of the adjacent regions is calculated and then compared with a preset antenna port number judging threshold, so that the number of the antenna ports of the adjacent regions is judged.
6. The apparatus for detecting the number of neighboring antenna ports as claimed in claim 5, wherein in the frequency domain channel estimation unit, the frequency domain channel estimation is obtained by using a least square method according to the received signal at the frequency domain reference signal RS and the reference signal at the local reference signal RS.
7. The apparatus according to claim 5, wherein the dimension of the frequency domain channel estimation is zero-padded to an integer power of 2 in the inverse discrete Fourier transform unit, and then the inverse discrete Fourier transform of the integer power of 2 is performed on the frequency domain channel estimation to obtain the time domain channel estimation.
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| CN105553893B (en) * | 2016-01-07 | 2021-04-09 | 广东新岸线科技有限公司 | Method and device for estimating time domain channel impulse response |
| CN110011744B (en) * | 2018-12-26 | 2021-07-27 | 一诺仪器（中国）有限公司 | Port detection method, system and terminal |
| CN117279013B (en) * | 2023-11-17 | 2024-02-02 | 芯迈微半导体(上海)有限公司 | Port identification method and port identification device |
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| CN101534266A (en) * | 2009-04-14 | 2009-09-16 | 北京天碁科技有限公司 | Channel estimation method for Orthogonal Frequency Division Multiplexing system and device thereof |
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