Wireless receiving and transmitting system based on long-term evolution (LTE)

Abstract

The invention discloses a wireless receiving and transmitting system based on long-term evolution (LTE). The wireless receiving and transmitting system based on LTE comprises an LTE transmitting unit and an LET receiving unit, wherein the LTE transmitting unit comprises a signal source modulator, a first frequency converter, a first digital frequency synthesizer, a first phase-locked loop synthesizer, a transmission radiofrequency front end and a first MIMO (Multiple Input Multiple Output) antenna array, wherein the LTE receiving unit comprises a second MIMO antenna array, a receiving radiofrequency front end, a second frequency converter, a third frequency converter, a second phase-locked loop synthesizer, a second digital synthesizer, a medium-frequency filter, an AD (Analog to Digital) converter and a signal source revolving unit. A two-layer frequency spectrum expansion mechanism is adopted, and different expansion sequences can be adopted in each layer of expansion, so that the frequency spectrum of a whole communication system is extended greatly, and the security and interference resistance of the system are enhanced.

Description

technical field [0001] The invention relates to the field of wireless communication, in particular to a long-term evolution-based wireless transceiver system. Background technique [0002] LTE (Long Term Evolution) is a long-term evolution of the UMTS (Universal Mobile Telecommunications System) technical standard formulated by 3GPP (Third Generation Partnership Project). It was officially established and launched at the 3GPP Toronto TSGRAN#26 meeting in December 2004. The LTE system introduces key transmission technologies such as OFDM (Orthogonal Frequency Division Multiplexing) and MIMO (Multiple Input Multiple Output), which significantly increases the spectral efficiency and data transmission rate (20M bandwidth 2X2MIMO in the case of 64QAM, the theoretical maximum transmission rate of the downlink is 201Mbps, about 140Mbps after excluding signaling overhead, but according to actual networking and terminal capability limitations, it is generally believed that the peak r...

AI Technical Summary

Problems solved by technology

[0003] The spectrum spreading methods adopted by the LTE system mainly include the modulation spreading method based on the narrowband modulation technology and the modulation spreading method based on the pseudo-random sequence and phase shift keying. Among them, the modulation spreading method based on the narrowband modulation technology is kept secret. strong, but the ability to resist multipath interference is weak, and it is easy to cause interference to other users. The modulation expansion method based on pseudo-random sequence and phase shift keying increases with the sequence length, and the anti-interference ability will also increase, but the sequence length The increase of will reduce the data transmission rate, therefore, how to coordinate and compensate for different modulation extension methods is particularly important

Images