CN110011744B - Port detection method, system and terminal - Google Patents
Port detection method, system and terminal Download PDFInfo
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- CN110011744B CN110011744B CN201811597636.3A CN201811597636A CN110011744B CN 110011744 B CN110011744 B CN 110011744B CN 201811597636 A CN201811597636 A CN 201811597636A CN 110011744 B CN110011744 B CN 110011744B
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Abstract
The invention provides a port detection method, which comprises the following steps: performing channel estimation on each port to obtain frequency domain channel estimation information of each port; calculating time domain information of pilot signals of each port based on the frequency domain channel estimation information, wherein the time domain information comprises time domain signal power; the maximum value of the time domain signal power of each port is taken, and a first judgment value and a second judgment value are preset; and comparing the maximum value of the time domain signal power of each port with the first judgment value and the second judgment value to determine the number of the communication ports. A port detection system, comprising: the device comprises a channel estimation unit, a time domain frequency calculation unit and a port number judgment unit. The invention uses the time domain signal power characteristic information of different port channel estimation to detect the port information of the transmitter, and uses the characteristics of different port pilot channel estimation in the time domain to complete the detection of the antenna port.
Description
Technical Field
The present invention relates to the field of communications, and in particular, to a port detection method, system, and terminal.
Background
The MIMO technology is a mobile communication technology with high communication efficiency. Taking LTE communication system as an example, since it adopts advanced OFDM (orthogonal frequency division multiplexing) technology and MIMO (multiple input multiple output) technology, it provides faster and higher experience rate for users, and has become the mainstream technology in communication market. An LTE system supporting multi-port transmission techniques such as beamforming techniques for PDSCH channels, and a Physical Broadcast Channel (PBCH) supporting transmit diversity mode; the PBCH channel supports the transmit diversity mode of 1, 2 and 4 ports, is used for adapting to different practical application scenes and obtains better cell coverage indexes.
In an LTE system, a UE (user equipment) side obtains an MIB (master information block) by analyzing a PBCH (physical broadcast channel) in the initial access process of a cell so as to obtain system configuration information; if the number of antenna ports is unknown at the UE side, the equalization between the channel estimation and the PBCH channel cannot be performed using appropriate port information, and therefore, it becomes very important to detect the number of transmission ports. In the design of the 3gpp.36.211 protocol, the information of the number of transmitting ports of an antenna is hidden in CRC mask (cyclic redundancy check mask) information of an original bit of a PBCH channel; that is, before the PBCH channel is correctly detected, the system cannot obtain the information of the number of antenna ports from the CRC mask.
In the existing terminal, PBCH channel decoding is usually attempted by using three cases of transmitting antenna port numbers, i.e. 1, 2, and 4, respectively, until PBCH is correctly decoded, which increases decoding complexity, especially the PBCH can be correctly decoded after three complete decoding processes at most, which has a considerable amount of computation and is not favorable for engineering practice requirements.
In addition, in some meter designs or dedicated terminal designs, the system may not include a processing procedure for solving pbcmpib, and a mode of adopting non-UE identification ports becomes a practical requirement; in the prior art, the main idea is to use the receiving power of CRS (cell reference information) information of each port to make a decision, and this scheme can correctly detect the port of the transmitter in an environment with high signal-to-noise and small frequency selectivity; under low signal-to-noise ratio and fading scenarios, the detection performance is poor.
Disclosure of Invention
The invention aims to provide a port detection method, which judges the number of ports for communication by analyzing the time domain frequency of the ports, and also provides port detection equipment and a detection terminal.
In order to achieve the above object, the present invention provides a port detection method, including:
port channel estimation: performing channel estimation on each port to obtain frequency domain channel estimation information of each port;
calculating the time domain frequency of a port: calculating time domain information of pilot signals of each port based on the frequency domain channel estimation information, wherein the time domain information comprises time domain signal power;
determining the number of ports: the maximum value of the time domain signal power of each port is taken, and a first judgment value and a second judgment value are preset; and comparing the maximum value of the time domain signal power of each port with the first judgment value and the second judgment value to determine the number of the communication ports.
Further, default signal transmission is performed according to 4 ports, and the method for determining the number of the communication ports specifically comprises the following steps:
determining a first port judgment value and a second port judgment value; the first port judgment value is greater than or equal to the sum of the maximum time domain signal power of the 2 nd port and the maximum time domain signal power of the 3 rd port; the second port judgment value is greater than or equal to the maximum value of the time domain signal power of the 1 st port;
if the maximum time domain signal power of the port 0 is smaller than the first port judgment value, judging that the port is 4-port communication;
if the maximum time domain signal power of the port 1 is larger than the first port judgment value, and the maximum time domain signal power of the port 0 is smaller than the second port judgment value, judging 2-port communication;
and if the maximum value of the time domain signal power of the port 1 is smaller than the maximum value of the time domain signal power of the port 0, judging 1-port communication.
Further, setting a first power threshold and a second power threshold;
adding the maximum values of the time domain signal power of the port2 and the port 3, and calculating with a first power threshold value to obtain a first port judgment value; and calculating the maximum value of the time domain signal power of the port 1 and a second power threshold value to obtain a second port judgment value.
Further, the calculation is a multiplication calculation or an addition calculation.
Further, adding the maximum values of the time domain signal powers of the port2 and the port 3 to obtain a first port judgment value; and taking the maximum value of the time domain signal power of the port 1 as a second port judgment value.
Further, the method for performing channel estimation on each port comprises the following steps:
performing CP removal processing on the data stream to obtain an effective data stream;
performing cell search on a communication system, and acquiring type information of the cell communication system, wherein the type information comprises timing information, cell PCI information and CP type information; extracting the time domain position of the pilot signal based on the timing information and the CP type information, and extracting the frequency domain position of the pilot signal based on the cell PCI information;
and performing channel estimation based on the extracted time domain position and frequency domain position.
Further, the method for calculating the time domain signal power of each port comprises the following steps:
respectively carrying out Fourier transform on data of each symbol of the port, converting the data into a time domain, and calculating the power of a time domain signal; accumulating the time domain signal power of each symbol of the port; and finding the maximum value as the power of the port time domain signal.
Further, the method for calculating the time domain signal power of each port comprises the following steps:
and sequentially taking the first n frequency domain channel estimates of each symbol of the port, taking out one channel estimate each time, sequentially arranging the channel estimates to serve as a channel estimation sequence, carrying out Fourier transform on the channel estimation sequence, and calculating the time domain signal power.
Further, channel estimation information is obtained, and after filtering and denoising processing is performed on the channel estimation information, time domain information of a pilot signal is calculated.
The invention also provides a port detection system, comprising:
a channel estimation unit: the system comprises a plurality of ports, a frequency domain channel estimation unit and a frequency domain channel estimation unit, wherein the ports are used for carrying out channel estimation on each port and obtaining frequency domain channel estimation information of each port;
a time domain frequency calculation unit: the time domain information of the pilot signal of each port is calculated according to the frequency domain channel estimation information of each port, and the time domain information comprises time domain signal power;
a port number judgment unit: and the device is used for determining the number of the communication ports according to the maximum value of the time domain signal power of each port and the comparison result of the preset first judgment value and the second judgment value.
The invention further provides a terminal which comprises the port detection unit.
Compared with the prior art, the invention has the advantages and positive effects that:
the invention provides a method and a device for detecting a port of an LTE (Long term evolution) system, which are used for detecting the port information of a transmitter by using time domain signal power characteristic information of different port channel estimations, completing the detection of an antenna port by using the characteristics of different port pilot channel estimations in a time domain and providing a basis for the channel estimation and the balance of a subsequent PBCH (physical broadcast channel). The invention provides a scheme for detecting by utilizing time domain signal power characteristics, the method is simple and effective, and a good port detection effect is obtained in a low signal-to-noise ratio and fading scene.
Drawings
FIG. 1 is a schematic flow chart of a port detection method according to the present invention;
FIG. 2 is a flow chart of a method for determining the number of antenna ports according to the present invention;
FIG. 3 is a schematic flow chart of an alternative port detection method of the present invention;
FIG. 4 is a schematic diagram of the algorithm of the present invention;
FIG. 5 is a schematic diagram of the system application of the present invention at the UE side;
fig. 6 is a schematic diagram of the use of the present invention in a meter.
Detailed Description
Hereinafter, embodiments of the present invention will be further described with reference to the accompanying drawings.
It should be noted that, the time domain signal power described herein is a result of converting the frequency domain channel estimation into the time domain; not the direct time domain power of the signal.
The invention relates to the technical field of mobile communication, in an LTE system, a UE cell initial search process or a detection technology of the number of antenna ports in an instrument. The port detection method and the system provided by the invention are mainly used for detecting the number of the LTE communication ports, and the port number is detected according to the characteristics of pilot frequency information of different ports.
Referring to fig. 1, the present invention provides a port detection method, including:
step S1, estimating port channels, estimating channels of each port, and acquiring frequency domain channel estimation information of each port; channel estimation information is obtained, and after filtering and denoising processing are carried out on the channel estimation information, time domain information of a pilot signal is calculated, so that the accuracy of the channel signal is improved;
step S2, port time domain frequency calculation: calculating time domain information of pilot signals of each port based on the frequency domain channel estimation information, wherein the time domain information comprises time domain signal power; the conversion from the frequency domain to the time domain can adopt Fourier transform; the time domain signal power is not the time domain signal power of the signal, but the time domain signal power obtained after the frequency domain to time domain conversion based on the channel estimation;
step S3, determining the port number: the maximum value of the time domain signal power of each port is taken, and a first judgment value and a second judgment value are preset; and comparing the maximum value of the time domain signal power of each port with the first judgment value and the second judgment value to determine the number of the communication ports.
The antenna port is a port for logic transmission, and for a 4-port LTE antenna, 1 port, 2 ports, or 4 ports may be used for data transmission. When the port 1 occurs, the port 0 is adopted, when the port2 transmits, the port 0 and the port 1 are adopted, and when the port 4 transmits, the port 0, the port 1, the port2 and the port 3 are adopted. Port2 and port 3 always appear in pairs and only operate at 4-port communication. Wherein the 0 port and 1 port pilots comprise four symbols in one sub-frame, and the 2 ports and 3 ports comprise 2 symbols in the sub-frame. In performing channel estimation, the 0 port and the 1 port may have channel estimation results of four symbols, and the 2 port and the 3 port may have channel estimation results of two symbols.
As a specific embodiment, a method for confirming the number of ports of a 4-port LTE antenna communication system will be described with respect to the transmission characteristics of LTE antenna ports. Specifically referring to fig. 2, the default method for transmitting signals according to 4 ports includes:
step S21, determining a first port judgment value and a second port judgment value; specifically, the first port determination value and the second port determination value are two specific time domain signal power values, and the two time domain signal power values are used as a standard to determine the number of the communication ports; the first port arbitration value and the second port arbitration value need to satisfy the following relationship: the first port judgment value is used for assisting in judging 4-port communication and 2-port communication, is related to 2 nd port time domain signal power and 3 rd port time domain signal power, and is greater than or equal to the sum of the 2 nd port time domain signal power maximum and the 3 rd port time domain signal power maximum, and the principle is as follows: when 4 ports communicate, 2 ports and 3 ports can participate in communication inevitably, because 2 ports and 3 ports are two symbol ports, the result after each frequency domain channel estimation is converted into a time domain, and time domain signal power is obtained, and the time domain signal power value is inevitably smaller than the time domain signal power values of 0 port and 1 port; the second port judgment value is used for assisting in judging 2-port communication and is related to the time domain signal power of the 1 st port, and the second port judgment value is larger than or equal to the maximum value of the time domain signal power of the 1 st port.
Step S22: and comparing the first port judgment value and the second port judgment value of the time domain signal power of the port 0 and the time domain signal power of the port 1 to determine the number of the ports.
And step S221, if the maximum time domain signal power of the port 0 is smaller than the first port judgment value, judging that the communication is 4-port communication.
Step S222, if the maximum value of the time domain signal power of the port 1 is larger than the first port judgment value, and the maximum value of the time domain signal power of the port 0 is smaller than the second port judgment value, judging 2-port communication;
and step S223, if the maximum value of the time domain signal power of the port 1 is smaller than the maximum value of the time domain signal power of the port 0, judging 1-port communication.
The steps S221 to S223 are parallel steps, and the execution sequence is not limited.
Two alternative implementations of the first and second port arbitration values are provided below.
The first implementation method comprises the following steps:
directly adopting the sum of the maximum value of the 2 nd port time domain signal power and the maximum value of the 3 rd port time domain signal power as a first port judgment value; and directly adopting the maximum value of the time domain signal power of the first port as the judgment value of the second port.
The method has the advantages of relative simplicity and no need of complex operation on the time domain signal power value of each port.
The second implementation method comprises the following steps:
further setting a first power threshold threshA and a second power threshold threshB; wherein threshA and threshB are used as threshold information and are set according to the implementation scene.
Adding the maximum values of the time domain signal power of the port2 and the port 3, and calculating the maximum values and a first power threshold ThreshA to obtain a first port judgment value; and calculating the maximum value of the time domain signal power of the port 1 and a second power threshold ThreshB to obtain a second port judgment value.
The above operation may be a multiplication operation or an addition operation. The method has the advantages that: the method can adapt to various environments, and if the threshold is increased, the threshold value can be adjusted according to the quality of the received signal, so that the adaptability to the channel is increased.
The application of the second embodiment will be described in detail.
(1) The maximum value of the time domain signal power for each port sequence was found, portzermomaxpower (port 0), portonemaxpower (port 1), porttwomaxpower (port 2), portthreemaxpower (port 3).
(2) Since Port2 and Port 3 are paired, the time domain signal power maximum values of ports 2 and 3 are added, i.e., Port23 summpower (sum of the time domain signal power maximum values of Port2 and Port 3), Port23 summpower ═ PortTwoMaxPower + portthreewauxpower.
(3) If PortZerOMaxPower < Port23SumPower ThreshA, then the number of ports is considered to be 4;
if (PortOneMaxPower > Port23 summower > thresh & & (PortOneMaxPower) > portzermomaxpower, the Port number is considered to be 2;
if PortOneMaxPower > PortZerOMaxPower, the number of ports is considered to be 1.
As a preferred embodiment, a channel estimation method in step S1 is further provided below.
Further, the method for performing channel estimation on each port comprises the following steps:
for an LTE system, acquiring type information of a cell communication system by utilizing a cell search process, wherein the type information comprises timing information, cell PCI information and CP type information;
performing CP removal processing on the data stream to obtain an effective data stream; the CP is used as the prefix of the data, is not used for the subsequent calculation of frequency domain and time domain, and the data after CP removal processing is effective data.
Extracting the time domain position of the pilot signal based on the timing information and the CP type information, and extracting the frequency domain position of the pilot signal based on the cell PCI information; wherein, for the frequency domain position, it can also be obtained according to PCI information and bandwidth information, but the bandwidth information is available or unavailable information;
and performing channel estimation based on the extracted time domain position and frequency domain position.
When the channel estimation information is obtained, the channel estimation information can be filtered and denoised, and then the channel time domain information converted by frequency domain channel estimation is calculated, which is beneficial to improving the accuracy of judgment.
As a preferred embodiment, a method for calculating the time domain signal power in step S2 is further provided below.
Further, the method for calculating the time domain signal power of each port comprises the following steps:
and splicing the channel estimation information of each port corresponding to each subframe into a channel estimation sequence, converting the channel estimation sequence into a time domain sequence of each port channel, and calculating the time domain signal power of each port based on the time sequence. The method for calculating the time domain signal power based on the time domain sequence belongs to a conventional method, and is not described herein again.
The channel estimation sequence is the key for frequency domain to time domain conversion, and there are many design methods for channel estimation sequence.
The first method comprises the following steps:
respectively carrying out Fourier transform on data of each symbol of the port, converting the data into a time domain, and calculating the power of a time domain signal; accumulating the time domain signal power of each symbol of the port; and finding the maximum value as the power of the port time domain signal.
Taking port 0 as an example for explanation: in the 20M bandwidth scenario, there are four symbols for port 0, and each symbol has 200 pilots for channel estimation.
The use method I comprises the following steps: performing FFT (fast Fourier transform) on the data of each symbol, converting the data into a time domain, and calculating the power of a time domain signal; accumulating the time domain signal power of the four symbols; the maximum value is found.
The method has the advantages of simplicity, easy operation and high efficiency.
The second method comprises the following steps:
and sequentially taking the first n frequency domain channel estimates of each symbol of the port, taking out one channel estimate each time, sequentially arranging the channel estimates to serve as a channel estimation sequence, carrying out Fourier transform on the channel estimation sequence, and calculating the time domain signal power.
For a specific example, a four-symbol port 0 and a two-symbol port2 are taken as examples.
The sequence result of symbol 0 is { C01, C02.., C0200}, the channel estimation result of symbol 1 { C11, C12.., C1200}, the channel estimation result of symbol 2 { C21, C22.., C2200}, and the channel estimation result of symbol 3 { C31, C32.., C3200 }.
And X is (C01C 11C21C31C02C12C22C 32) in cross-connection and series-connection.
If two-symbol port2 is taken as an example for illustration.
The sequence result of symbol 0 is { D01, D02.., D0200}, and the channel estimation result of symbol 1 is { D11, D12.., D1200 }.
And X is equal to { D01D11D02D12} when the two are connected in series.
The method II has the advantages that: 1. the X sequence can be cut off according to actual needs, and the resolution of FFT calculation is ensured; the X sequence can be regarded as { C01, C02., C0200}, and the peak value is more obvious after interpolation.
Referring to fig. 3, a complete flow chart of another port detection method combining the channel estimation method and the time domain frequency calculation method provided by the present invention is shown. The principle is the same, and the description is omitted.
Referring to fig. 4, a schematic diagram of the method of fig. 3 is shown. Specifically, at the transmitting end, a solid line indicates that two ports are selected for transmission, and a dotted line indicates that no data is transmitted; after passing through a wireless channel, firstly, performing channel estimation and filtering and noise filtering processing to obtain time domain channel estimation and characterize the characteristics of a channel experienced by a signal, as shown in the rightmost part of the figure; the actually transmitted signal has peak information due to correlation with the desired pilot; the port that does not transmit is a noise signal on the receiving side, and is therefore noise and has no peak, regardless of the pilot on that port.
Example 2
The present embodiment provides a port detection system, which is used to implement the port detection method in the above preferred embodiment. The port detection system can be implemented based on a processor and other devices, and comprises a port detection module, wherein the port detection module specifically has the following functional units to achieve the determination effect of the port number.
A channel estimation unit: the system comprises a plurality of ports, a frequency domain channel estimation unit and a frequency domain channel estimation unit, wherein the ports are used for carrying out channel estimation on each port and obtaining frequency domain channel estimation information of each port; specifically, the channel estimation unit may obtain a time domain position and a frequency domain position of the pilot symbol based on a cell search process, and extract effective pilot symbol information. And performing channel estimation based on the time domain position and the frequency domain position of the pilot frequency symbol. As an auxiliary function, filtering and denoising processing may also be performed on the channel estimation result.
A time domain frequency calculation unit: the time domain information of the pilot signal of each port is calculated according to the frequency domain channel estimation information of each port, and the time domain information comprises time domain signal power; specifically, the time domain frequency calculation unit determines a channel estimation sequence, performs fourier transform on the channel estimation sequence to obtain a time domain sequence, and calculates the time domain frequency based on the time domain sequence.
A port number judgment unit: and the device is used for determining the number of the communication ports according to the maximum value of the time domain signal power of each port and the comparison result of the preset first judgment value and the second judgment value. Specifically, the maximum power value of the port 1 and the maximum power value of the port 0 are compared with the first determination value and the second determination value, and the number of the ports is determined.
Example 3
The present embodiment provides a terminal including the port detection system in embodiment 2 described above. It can be applied to the UE side or the instrument of the communication system, and refer to fig. 5 and 6 in particular.
Fig. 5 is a schematic diagram illustrating an application of the port detection system in the LTE UE side system. The receiver signal can obtain frame timing information, PCI information and CP type information through the cell search process; then using a port detection module to identify the number of ports used by the transmitter; and selecting a proper channel estimation and equalization scheme by using the port information, and analyzing the PBCH channel to acquire MIB information. As can be seen from the figure, PBCH demodulation does not need to be attempted in three ports.
Fig. 6 shows a schematic diagram of the application of the port detection system in a meter. Different from fig. 5, in the meter, a port detection technology is used, that is, a channel estimation and equalization technology can be performed on each physical channel, port information does not need to be obtained by analyzing MIB information carried by a PBCH channel, and a meter processing process can be simplified.
The above description is only a preferred embodiment of the present invention, and not intended to limit the present invention in other forms, and any person skilled in the art may apply the above modifications or changes to the equivalent embodiments with equivalent changes, without departing from the technical spirit of the present invention, and any simple modification, equivalent change and change made to the above embodiments according to the technical spirit of the present invention still belong to the protection scope of the technical spirit of the present invention.
Claims (7)
1. A method for port detection, comprising:
port channel estimation: performing channel estimation on each port to obtain frequency domain channel estimation information of each port;
calculating the power of a port time domain signal: calculating time domain information of pilot signals of each port based on the frequency domain channel estimation information, wherein the time domain information comprises time domain signal power;
determining the number of ports: taking the maximum value of the time domain signal power of each port, and presetting a first judgment value and a second judgment value; comparing the maximum value of the time domain signal power of each port with the first judgment value and the second judgment value to determine the number of the communication ports;
the default is to transmit signals according to 4 ports, and the method for determining the number of the communication ports specifically comprises the following steps:
determining a first port judgment value and a second port judgment value; the first port judgment value is greater than or equal to the sum of the maximum time domain signal power of the 2 nd port and the maximum time domain signal power of the 3 rd port; the second port judgment value is greater than or equal to the maximum value of the time domain signal power of the 1 st port;
if the maximum time domain signal power of the port 0 is smaller than the first port judgment value, judging that the port is 4-port communication;
if the maximum time domain signal power of the port 1 is larger than the first port judgment value and the maximum time domain signal power of the port 0 is smaller than the second port judgment value, judging 2-port communication;
if the maximum value of the time domain signal power of the port 1 is smaller than the maximum value of the time domain signal power of the port 0, judging port 1 communication;
setting a first power threshold and a second power threshold;
adding the maximum values of the time domain signal power of the port2 and the port 3, and calculating with a first power threshold value to obtain a first port judgment value; calculating the maximum value of the time domain signal power of the port 1 and a second power threshold value to obtain a second port judgment value;
the calculation is a multiplication or addition calculation.
2. The method of claim 1, wherein the channel estimation for each port is performed by:
performing CP removal processing on the data stream to obtain an effective data stream;
performing cell search on a communication system, and acquiring type information of the cell communication system, wherein the type information comprises timing information, cell PCI information and CP type information; extracting a time domain position of the pilot signal based on the timing information and the CP type information, and extracting a frequency domain position of the pilot signal based on the timing information and the cell PCI information;
and obtaining receiving pilot frequency information based on the extracted time domain position and frequency domain position, and performing channel estimation.
3. The method of claim 1, wherein the method of calculating the time domain signal power for each port comprises:
respectively carrying out Fourier transform on data of each symbol of the port, converting the data into a time domain, and calculating the power of a time domain signal; accumulating the time domain signal power of each symbol of the port; and finding the maximum value as the power of the port time domain signal.
4. The method of claim 1, wherein the method of calculating the time domain signal power for each port comprises:
and sequentially taking the first n frequency domain channel estimates of each symbol of the port, taking out one channel estimate each time, taking the sequence as a channel estimation sequence, carrying out Fourier transform on the channel estimation sequence, and calculating the time domain signal power.
5. The method of claim 1, further comprising:
and obtaining channel estimation information, filtering and denoising the channel estimation information, and then calculating pilot frequency signal time domain information.
6. A port detection system, comprising:
a channel estimation unit: the system is used for carrying out channel estimation on each port and obtaining frequency domain channel estimation information of each port;
a time domain frequency calculation unit: the time domain information of the pilot signal of each port is calculated according to the frequency domain channel estimation information of each port, and the time domain information comprises time domain signal power;
a port number judgment unit: the device comprises a power control module, a first judging value and a second judging value, wherein the power control module is used for determining the number of communication ports according to the maximum value of the time domain signal power of each port and the comparison result of the preset first judging value and second judging value;
the port judging unit determines the number of ports according to the following method:
the default is to transmit signals according to 4 ports, and the method for determining the number of the communication ports specifically comprises the following steps:
determining a first port judgment value and a second port judgment value; the first port judgment value is greater than or equal to the sum of the maximum time domain signal power of the 2 nd port and the maximum time domain signal power of the 3 rd port; the second port judgment value is greater than or equal to the maximum value of the time domain signal power of the 1 st port;
if the maximum time domain signal power of the port 0 is smaller than the first port judgment value, judging that the port is 4-port communication;
if the maximum time domain signal power of the port 1 is larger than the first port judgment value and the maximum time domain signal power of the port 0 is smaller than the second port judgment value, judging 2-port communication;
if the maximum value of the time domain signal power of the port 1 is smaller than the maximum value of the time domain signal power of the port 0, judging port 1 communication;
setting a first power threshold and a second power threshold;
adding the maximum values of the time domain signal power of the port2 and the port 3, and calculating with a first power threshold value to obtain a first port judgment value; calculating the maximum value of the time domain signal power of the port 1 and a second power threshold value to obtain a second port judgment value;
the calculation is a multiplication or addition calculation.
7. A terminal comprising the port detection system of claim 6.
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| CN103220707A (en) * | 2013-04-28 | 2013-07-24 | 重庆邮电大学 | Method for detecting quantity of antenna ports in LTE (Long Term Evolution) system |
| CN104753831A (en) * | 2013-12-26 | 2015-07-01 | 联芯科技有限公司 | Method and device for detecting quantity of adjacent region antenna ports |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2010062238A1 (en) * | 2008-11-03 | 2010-06-03 | Telefonaktiebolaget L M Ericsson (Publ) | Methods and arrangements for performing cell measurements in a cellular communication system having multiple antenna ports |
| 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 |
| CN103220707A (en) * | 2013-04-28 | 2013-07-24 | 重庆邮电大学 | Method for detecting quantity of antenna ports in LTE (Long Term Evolution) system |
| CN104753831A (en) * | 2013-12-26 | 2015-07-01 | 联芯科技有限公司 | Method and device for detecting quantity of adjacent region antenna ports |
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