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A method for detecting the number of antenna ports in an LTE system

An antenna port and detection method technology, applied in wireless communication, electrical components and other directions, can solve the problems of inability to estimate and equalize PBCH channels, unfavorable engineering practice requirements, and increase decoding complexity, so as to ensure effectiveness and feasibility. , Overcome time-consuming and improve the effect of accuracy

Active Publication Date: 2016-08-03
CHONGQING UNIV OF POSTS & TELECOMM
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Problems solved by technology

The information of the antenna port number is implicit in the CRCmask (cyclic redundancy check mask) information of the PBCH, and the information of the antenna port number cannot be obtained from the CRCmask before the PBCH channel is correctly detected; however, if there is no antenna port number, Unable to perform channel estimation and equalization on the PBCH channel with the correct number of antennas
The existing technology usually tries to decode the PBCH channel with three transmission antenna port numbers, 1, 2, and 4, until the PBCH is decoded correctly. This will increase the complexity of decoding, and in particular, it may experience a maximum of three complete decodings. The decoding process can be correctly decoded, which has a considerable amount of calculation, which is not conducive to the requirements of engineering practice.

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  • A method for detecting the number of antenna ports in an LTE system
  • A method for detecting the number of antenna ports in an LTE system
  • A method for detecting the number of antenna ports in an LTE system

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Embodiment Construction

[0022] Based on the resource mapping characteristics of SSS, PBCH channel, reference signal, etc., the present invention proposes a detection method for the number of antenna ports. When the channel quality is good, it detects based on the reference signal power; when the channel quality is poor, it detects based on the autocorrelation of the reference signal.

[0023] The invention proposes an antenna port detection method. Such as figure 1 Shown is a flow chart of the port detection method. The UE receives the data, performs cell search and timing synchronization, determines the mapping position of the PBCH, and then extracts the cell reference signal under the 1 / 2 / 4 antenna port from the bandwidth range of the PBCH mapping. The approximate signal-to-noise ratio (SNR) is obtained using the power ratio of the secondary synchronization signal (SSS) in subframe 0 and its guard null carrier. Set a threshold value (in the AWGN channel environment, the value range is suggested ...

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Abstract

The invention relates a method for detecting the quantity of antenna ports in an LTE (Long Term Evolution) system and relates to the technical field of mobile communication. According to the LTE system, the quantity of the antenna ports is hidden in a broadcasting channel through CRC (Cyclic Redundancy Check) mask. The method comprises the following steps of: reading a reference signal under 1 / 2 / 4 antenna port conditions from a received signal, carrying out SNR(Signal Noise Ratio) estimation by using SSS (secondary synchronization signals) and protection non-load carrier, and when the SNR (Signal Noise Ratio) is larger than a threshold value, judging the quantity of antenna ports by using a power ratio of the reference signal of the 1 / 2 / 3 antenna port to a reference signal of a 0th, and otherwise, judging the quantity of the antenna ports by using the reference signal of each antenna port and a related value of a local reference signal.

Description

technical field [0001] The invention relates to the technical field of mobile communication, in particular to a detection technology for the number of antenna ports in the initial search process of a terminal cell in an LTE system. Background technique [0002] In the fourth-generation mobile communication long-term evolution LTE system, MIMO (multiple-input multiple-output) is one of its key technologies. Among them, the physical broadcast channel (PBCH) supports single-antenna transmission mode and diversity transmission mode, so it supports 1, 2, 4 And so on three antenna port transmission modes. When the terminal interprets the PBCH channel to obtain the MIB (Master Information Block), it needs to correctly detect the number of sending ports used by the PBCH channel. The information of the antenna port number is implicit in the CRCmask (cyclic redundancy check mask) information of the PBCH, and the information of the antenna port number cannot be obtained from the CRCma...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W24/08
Inventor 王丹刘文文李小文陈发堂王华华刘宇
Owner CHONGQING UNIV OF POSTS & TELECOMM
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