Broadband wireless transmission method and system, transmitter and method, receiver and method

Abstract

The invention discloses a broadband wireless transmission method and a broadband wireless transmission system, a transmitter and a method, as well as a receiver and a method under high-speed movement environment. High-speed baseband signals serially input by a transmitting end are converted to be low-speed parallel baseband signals by series-to-parallel conversion, then MFDM (Multi-Frequency Difference Modulation) mapping is conducted, time-domain baseband signals are converted to be frequency-domain baseband signals which are converted to be time domain signals by IFFT (Inverse Fast Fourier Transform), a CP (Cyclic Prefix) is inserted and the parallel-to-series conversion is conducted, then the signals are sent to a radio frequency module and then are sent to an antenna to be transmitted, a receiving end converts the signals received by the antenna into digital baseband signals through the radio frequency module, the position synchronization is realized by a synchronization module, then the signals are subjected to series-to-parallel conversion, the CP is removed, the signals are sent to an FFT (Fast Fourier Transform) module and are converted to be frequency-domain baseband signals, then the MFDM mapping is removed, and time-domain baseband information is recovered. The Doppler frequency deviation caused by intersymbol interference and high-speed movement due to multipath propagation can be overcome, and the hardware structure of the receiver is simplified greatly due to the avoidance of channel estimation.

Description

technical field [0001] The invention relates to the field of broadband wireless communication, in particular to a broadband wireless transmission method and system, a transmitter and method, and a receiver and method in a high-speed mobile environment. Background technique [0002] With economic development and scientific and technological progress, people travel more and more frequently by public transport such as long-distance buses, subways, and trains, and the speed of transportation is getting faster and faster. The speed of buses on expressways can reach up to 120km / h, and the speed of subways is average. The speed of high-speed trains can reach more than 250km / h, and the speed of maglev trains can reach 600km / h. In the high-speed operation of traffic vehicles, how to provide better and faster services such as surfing the Internet and sending and receiving emails for passengers in transit, and how to transmit in-vehicle information and driving status to the ground in r...

AI Technical Summary

Problems solved by technology

[0007] 2. Channel estimation problem

The high-speed movement of the vehicle and the change of the geographical environment make the channel parameters of the wireless transmission channel change rapidly with time, making it difficult to perform accurate channel estimation. The error of the existing channel estimation algorithm increases with the increase of the vehicle speed, which is also a limitation. The main reason for OFDM in vehicle-to-ground communication

[0009] The traditional pilot-based channel estimation technology used in WiFi, WiMAX and LTE, under the condition of high-speed movement, the transmission channel changes rapidly, the accuracy of channel estimation decreases, and the communication performance drops sharply

Images