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Sparse MIMO-OFDM channel estimation method based on space-time correlation of channel

A MIMO-OFDM and correlation technology, applied in the field of sparse MIMO-OFDM channel estimation based on channel space-time correlation, to achieve the effects of reducing pilot overhead, improving channel estimation performance, and improving spectral efficiency

Inactive Publication Date: 2014-04-30
TSINGHUA UNIV +1
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  • Abstract
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  • Application Information

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to solve the problem that the number of pilots required for channel estimation increases with the number of antennas in the current MIMO-OFDM system, and at the same time improve the accuracy of channel estimation

Method used

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  • Sparse MIMO-OFDM channel estimation method based on space-time correlation of channel
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  • Sparse MIMO-OFDM channel estimation method based on space-time correlation of channel

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Embodiment 1

[0033] like figure 1 As shown, in this embodiment, a sparse MIMO-OFDM channel estimation method based on channel space-time correlation includes:

[0034] S1: Estimate the channel frequency domain response of different transceiver antennas to the pilots in the received OFDM symbols;

[0035] S2: arrange the channel frequency domain responses at the estimated frequency domain pilots of different transceiver antenna pairs into a matrix according to certain rules;

[0036] S3: Applying a super-resolution algorithm to process the matrix to obtain the number of multipath time delays of the channel;

[0037] S4: Process the matrix according to the obtained number of multipath time delays to obtain the multipath time delay of the channel;

[0038] S5: Obtain the multipath gain corresponding to the delay according to the multipath delay of the obtained channel and the matrix;

[0039] S6: Obtain the channel frequency domain response of the subcarrier at the data location according ...

Embodiment 2

[0052] Assume that during the period of Q OFDM symbols, the time-domain impulse response of the channel between the i-th transmit antenna and the j-th transmit antenna is

[0053] h Q ( i , j ) ( τ ) = Σ p = 1 P α p , Q ( i , j ) δ ( τ - τ p , Q ( i , j ) ) , ...

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Abstract

The invention discloses a sparse MIMO-OFDM channel estimation method based on a space-time correlation of a channel. Channel frequency domain responses of different transmit-receive antenna to a pilot frequency in a received OFDM symbol are estimated; the channel frequency domain responses of the different transmit-receive antenna to the estimated pilot frequency are arranged according to a certain rule into a matrix; the matrix is processed through the super-resolution algorithm so that the multipath time delay number of the channel can be acquired; the matrix is processed according to the acquired multipath time delay number, so that multipath time delays of the channel are acquired; multipath gain corresponding to a time delay is acquired according to the acquired multipath time delays and the acquired matrix of the channel; a channel frequency domain response to a subcarrier at data is acquired according to the acquired multipath time delays and the acquired gain. In this way, the problem that the number of required pilot frequencies increases along with the number of antenna in the channel estimation process in a current MIMO-OFDM system is solved; meanwhile, the space-time correlation of the channel is used for further improving channel estimation accuracy, remarkably reducing system pilot frequency spending, and improving spectrum efficiency.

Description

technical field [0001] The invention relates to the communication field, in particular to a sparse MIMO-OFDM channel estimation method based on channel space-time correlation. Background technique [0002] MIMO (Multiple-Input Multiple-Output) technology uses multiple antennas at the transceiver end to suppress channel fading on the one hand to obtain diversity gain, and uses multiple transmission channels formed by multiple antennas to obtain multiplexing gain. Theory proves that the channel capacity of the MIMO system increases linearly with the increase of the number of antennas, so the spectral efficiency can be significantly improved without increasing the bandwidth and antenna transmission power. OFDM (Orthogonal Frequency Division Multiplexing) technology is a multi-carrier transmission technology. This technology divides the channel into several parallel sub-channels, and converts the high-speed serial data flow into a low-speed parallel data flow, so that the fadin...

Claims

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Application Information

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IPC IPC(8): H04L25/02H04L27/26H04L1/06
Inventor 戴凌龙高镇张超王昭诚
Owner TSINGHUA UNIV
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