Interference cancellation and two-way cooperation channel estimation method based on affine precoding

A technology of channel estimation and interference cancellation, which is applied in the transmitter/receiver shaping network, baseband system components, radio transmission system, etc., and can solve the problems of two-way relay network performance degradation and other problems

Inactive Publication Date: 2017-06-13
NAVAL UNIV OF ENG PLA
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Problems solved by technology

[0003] In view of the above defects or improvement needs of the prior art, the present invention provides an interference cancellation and two-way cooperative channel estimation technology based on affine precoding, aiming at the degradation of the performance of the two-way relay network caused by self-interference errors in the two-way relay network problem, the "right multiplication" affine precoding theory is introduced into the two-way relay network, and the transmitted data is precoded. Then the "two" one-way relay channels are estimated, so that self-interference cancellation is not affected by channel estimation errors

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  • Interference cancellation and two-way cooperation channel estimation method based on affine precoding
  • Interference cancellation and two-way cooperation channel estimation method based on affine precoding

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[0117] According to above-mentioned simulation parameter setting, according to the embodiment of the present invention, construct training sequence:

[0118] c 1 = c 2 =[1.00+0.00i 0.98+0.19i 0.70+0.70i-0.19+0.98i-1.00+0.00i 0.19-0.98i 0.70+0.70i

[0119] -0.98-0.19i 1.00-0.00i-0.98-0.19i 0.70+0.70i 0.19-0.98i-1.00+0.00i-0.19+0.98i

[0120] 0.70+0.70i 0.98+0.19i] T

[0121] 3) The channel is set as a frequency-selective fading channel caused by multipath effects. Assuming a single-hop channel g 1 and g 2 and h 1 and h 2 have reciprocity.

[0122] 4) The noise is a Gaussian distributed random variable independent of each other, E{v(n)}=0, and the average power is

[0123] 5) node and The node information transmission rate is the same, that is, K 1 = K 2 .

[0124] 5) Appropriately add or remove length N at each node ZP The zero prefix (ZP) of the .

[0125] Table 1 System simulation parameter list

[0126]

[0127] Calculate the mean square error (MSE) ...

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Abstract

The invention discloses an interference cancellation and two-way cooperation channel estimation method based on affine precoding. The method comprises the steps of S1, establishing a precoding matrix and a decoding separation matrix; S2, combining information sequences and training sequences to establish data frames and carrying out precoding; S3, transmitting data signals and carrying out amplification and forwarding after data is superposed by a relay; S4, carrying out decoding separation operation, extracting training data and carrying out channel estimation on two-way parallel channels; and S5, extracting information data from target signals, carrying out symbol detection, and outputting a detection sequence. According to the method provided by the invention, the two-way relay is converted into two parallel and non-interfering one-way relay network channels; through combination of little training, the two one-way relay channels are estimated, so channel estimation is not influenced by elimination of self-interference; signal energy can be expanded to a whole band through precoding; the fading in a time-varying channel environment is overcome; and the time diversity gain is provided.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and more specifically relates to a channel estimation technology based on affine precoding interference cancellation and two-way cooperation. Background technique [0002] Compared with the one-way cooperative relay network (OWRN), the two-way cooperative relay network (TWRN) reduces the necessary transmission time slots, improves the spectrum utilization rate, and has high potential and value. In the current TWRN, most of them assume that the receiving end can completely eliminate the interference of the self-transmitted data in the second time slot. However, this perfect self-interference cancellation is based on the premise of perfect channel estimation. Due to delayed feedback and channel estimation errors in actual environments, it is very difficult or even impossible to obtain perfect CSI. For TWRN, channel estimation information is usually obtained by using training sequenc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/02H04L25/03H04B7/0456
Inventor 窦高奇何宪文邓冉高俊
Owner NAVAL UNIV OF ENG PLA
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