Method and system of double-antenna transmit diversity and channel evaluation based on TDS-OFDM

Abstract

The invention relates to a method and a system of double-antenna transmit diversity and channel evaluation based on TDS-OFDM. The method comprises the following steps: carrying out space time coding on a group of PN sequences, respectively filling two time slots and frame headers of signal frames to be transmitted by the two transmitting antennas with the training sequences obtained by the space time coding, and transmitting the signal frames to be transmitted; carrying out iterative channel evaluation according to the received training sequences in the signal frames to be transmitted by the two time slots, and updating the channel information of the two time slots. The method and the system can effectively process the interference between the training sequences of the two transmitting antennas, and channel evaluation is accurate and reliability for channel transmission is high.

Description

technical field [0001] The invention relates to the technical field of digital information transmission, in particular to a TDS-OFDM-based dual-antenna transmit diversity and channel estimation method and system. Background technique [0002] There are many kinds of fading in the process of signal transmission in the wireless environment. Under the time and frequency selective fading channel, the signal to noise ratio (Signal to Noise Ratio, SNR) of the received signal is unstable. When the signal passes through the deep fading channel, the received signal The SNR decreases, and the probability of judgment error increases. Diversity technology is a technology that can effectively overcome time and frequency selective fading. It transmits the same information on multiple independent channels, and then the receiving end synthesizes the received signals according to a certain algorithm, because several independent channels At the same time, the probability of being in deep fad...

AI Technical Summary

Problems solved by technology

Because in a dual-antenna transmit diversity system, in order to perform channel estimation, the frame signal sent by each antenna will carry a training sequence, and after being transmitted through an independent channel, it will arrive at the receiving end almost at the same time. Mutual interference between them makes it impossible to accurately estimate the channel, thus reducing the reliability of channel transmission and greatly affecting the communication quality of the channel

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