Method for detecting quantity of antenna ports in LTE (Long Term Evolution) system

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 number of antenna ports is implicit in the CRC mask (mask of the cyclic redundancy check) of PBCH, and the information of the number of antenna ports cannot be obtained from the CRC m...

AI Technical Summary

Problems solved by technology

The information of the number of antenna ports is implicit in the CRC mask (mask of the cyclic redundancy check) of PBCH, and the information of the number of antenna ports cannot be obtained from the CRC mask before the PBCH channel is correctly detected; however, if there is no antenna port The correct number of antennas cannot be used for channel estimation and equalization of the PBCH channel

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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