TD-SCDMA system channel estimation method based on unitary blank time code

Abstract

This invention relates to a TD-SCDMA system channel evaluation method based on the code of unitary space-time. At the sending end, the encoder of the code of unitary space-time is inserted into the TD-SCDMA link after the image of the physical channel and before spreading the spectrum, after the signal is imaged by the physical channel, it outputs a set of serial data to be modulated to a TxN matrix by the unitary space-time encoder, each rank of the matrix is emitted out by related antenna after spreading the spectrum and harassing, at the receiving end, after de-spreading the spectrum and decoding to the signals of each receiving antenna, a TxN matrix is formed to be decoded to signals before the unitary space-time modulation applying the maximum likelihood encode by the unitary space-time encoder.

Description

technical field [0001] The invention relates to the field of wireless communication, in particular to channel estimation technology in TD-SCDMA system. Background technique [0002] The current third-generation mobile communication standard requires the core network to be able to provide various services for the user terminal in a fast-moving state (the speed of the mobile terminal can be 120km / hr), which makes the channel fading between the mobile terminal and the base station change rapidly. And due to the contradiction between the limited spectrum and the increasing number of users, the MIMO antenna system is proposed to increase the capacity of the system, which makes the system estimate more channels, so when there are too many receiving and transmitting antennas or the fading coefficient between receiving and transmitting antennas In the case of rapid changes, it will be very difficult for the system to estimate the channel, and it may even be impossible to perform cha...

AI Technical Summary

Problems solved by technology

[0002] The current third-generation mobile communication standard requires the core network to be able to provide various services for the user terminal in a fast-moving state (the speed of the mobile terminal can be 120km / hr), which makes the channel fading between the mobile terminal and the base station change rapidly. And due to the contradiction between the limited spectrum and the increasing number of users, the MIMO antenna system is proposed to increase the capacity of the system, which makes the system estimate more channels, so when there are too many receiving and transmitting antennas or the fading coefficient between receiving and transmitting antennas In the case of rapid changes, it will be very difficult for the system to estimate the channel, and it may even be impossible to perform channel estimation

The traditional TD-SCDMA system also uses the Midamble code with 128 chips in its time slot burst (burst) structure to perform channel estimation. If the Midamble code is wrong during transmission, the channel estimation will also be wrong, making the information Without reliable and accurate transmission, the system will have difficulty in channel estimation when providing users with high-speed data, and the receiving end will not be able to demodulate the transmission information

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