A channel estimation method for transmit diversity system

Abstract

The invention discloses a signal channel estimation method of a transmission diversity system and belongs to the technical field of digital information transmission. The method comprises the following steps: a space time code designed according to the matrix orthogonality is taken as a diversity training sequence; a sender fills the diversity training sequence in a data frame and sends the data frame out; a receiver extracts the training sequence filled in the data frame and the linear convolutions of channel impulse response from the corresponding sender to the receiver; the sum of the linear convolutions is reconstructed for acquiring a circular convolution; the frequency domain form of the circular convolution is computed; the frequency domain estimation of the channel impulse response is computed according to the frequency domain form; the channel estimation from the sender to the receiver is computed according to the frequency domain estimation of the channel impulse response. The invention uses the designed space time code as the diversity training sequences, and selects the diversity training sequences with constant modulus in the frequency domains or the sum of frequency domains, thus effectively eliminating interference among the diversity training sequences and simplifying the channel estimation of the transmission diversity system.

Description

technical field [0001] The invention relates to the technical field of digital information transmission, in particular to a channel estimation method of a transmit diversity system. Background technique [0002] The main problem of current communication technology is how to reliably increase the transmission rate within a limited bandwidth. Single / multi-carrier modulation systems will produce frequency-selective fading under multi-path transmission channels, that is, ISI (Inter Symbol Interference, inter-symbol interference) , and the system that transmits in units of data blocks will generate IBI (Inter Block Interference, inter-block interference). One way to combat multipath interference is to add GI (Guard Interval, guard interval) between transmitted data blocks. When the length of the added GI is not less than the maximum multipath delay of the channel, the data blocks between GI Inter-block interference will not occur. There are many filling methods for GI: see Figu...

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Problems solved by technology

[0007] In the prior art, the document [Y.Li, "Simplified channel estimation for OFDM systems with multipletransmit antennas," IEEE Trans.Wireless Communications, vol.1, no1, pp.67-75, Jan.2002] proposed a method using The design method of multiple training sequences generated by different displacements of the training sequence, the channel estimation method is complicated, but the channel length estimated by the training sequence is at most half of the original

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