A Precoding Method Based on Incomplete Channel Information in Spatial Correlation MISO Systems

A technology of spatial correlation and channel information, applied in the directions of space transmit diversity, diversity/multi-antenna system, advanced technology, etc., it can solve the problems of no closed-form expression for power allocation, prolonged processing time, poor real-time performance, etc. , to achieve the effect of low cost, low delay and avoid iterative calculation

Inactive Publication Date: 2016-04-20
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

[0006] 2. Using the obtained Lagrangian multipliers, it is necessary to determine the eigenbeams that obtain positive power through iterative calculations, so as to obtain the final power allocation, so the amount of calculation is large
[0007] 3. The closed expression used to directly calculate the power distribution is not given, so the realization is more complicated
[0008] 4. The convergence speed is slow, the processing delay is long, and the real-time performance is not good

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  • A Precoding Method Based on Incomplete Channel Information in Spatial Correlation MISO Systems
  • A Precoding Method Based on Incomplete Channel Information in Spatial Correlation MISO Systems
  • A Precoding Method Based on Incomplete Channel Information in Spatial Correlation MISO Systems

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Embodiment Construction

[0027] to combine figure 1 , the steps of the precoding method design process of the present invention are as follows:

[0028] Step 1: Establish a system model and a corresponding channel model; establish a space-correlated wireless MISO (Multiple Input Single Output) communication system model, which has M transmitting antennas and a single receiving antenna, and its corresponding channel model can be expressed as a channel matrix h= {h m}, which can be modeled as: , where h w is the randomly varying part of the channel, R t is the transmit antenna correlation matrix, representing the channel covariance matrix.

[0029] Step 2: Determine the effective signal-to-noise ratio of the system; from the received signal matrix, the effective signal-to-noise ratio at the receiving end can be obtained ,in: , is the average SNR (signal-to-noise ratio), u im is the element of beamforming matrix U, and r is the code rate of space-time coding. {P m ,m=1,...,M} is the power c...

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Abstract

The invention discloses a precoding method based on incomplete channel information in a space correlation multiple inputs, single output (MISO) system, and relates to the technical field of self-adaptation resource distribution in wireless communications. The precoding method comprises the following steps: building a MISO system and a channel model, confirming an effective signal to noise ratio of the system, confirming a condition correlation matrix and precoding beam forming matrix, confirming power distribution and a minimized system average bit rate in precoding, and confirming a bit error rate of the system. The precoding method can achieve closed power distribution and can avoid iterative computations of existing best practices. A power distribution expression is simple and can be calculated directly. Practical feedback errors are considered, and practicability is achieved. The method is low in complexity, low in cost, short in time delay and prone to being achieved.

Description

technical field [0001] The patent of the present invention relates to the technical field of adaptive resource allocation in wireless communication; in particular, a precoding method based on incomplete channel information in a space-correlated MISO system. Background technique [0002] As one of the key technologies in wireless communication, precoding technology has become an important research content and hot issue in future mobile communication. With the rapid growth of information demand, multi-antenna technology for high-speed reliable transmission in fading channels has received extensive attention. By using channel state information (CSI) for precoding design, multi-antenna communication systems can achieve significant improvements in spectrum efficiency and reliability. But when the channel information is incomplete, the system performance will decrease obviously. As an effective transmit diversity technique in wireless communication, space-time block coding (STBC...

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): H04B7/06H04B7/08
CPCY02D30/70
Inventor虞湘宾陈小敏刘晓帅殷馨辛瑜玉
OwnerNANJING UNIV OF AERONAUTICS & ASTRONAUTICS