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LDLH matrix decomposition-based band-limited block minimum mean squared error (MMSE) equilibrium method

An equalization method and matrix decomposition technology, applied in baseband system components, shaping network in transmitter/receiver, etc., can solve problems such as inter-carrier interference and compensation difficulties, and achieve good system performance and low computational complexity Effect

Active Publication Date: 2011-03-23
SOUTHEAST UNIV
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Problems solved by technology

Different from traditional MIMO systems, the existence of MCFOs in cooperative communication systems will make direct carrier frequency offsets (CFO) compensation difficult, and will cause intercarrier interference (ICI) effects

Method used

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  • LDLH matrix decomposition-based band-limited block minimum mean squared error (MMSE) equilibrium method
  • LDLH matrix decomposition-based band-limited block minimum mean squared error (MMSE) equilibrium method
  • LDLH matrix decomposition-based band-limited block minimum mean squared error (MMSE) equilibrium method

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Embodiment Construction

[0020] Below in conjunction with example the utility model is described further.

[0021] Assume that the length of the data block transmitted by the channel is N, and the length of the zero vector inserted at both ends of the coded vector is D, according to figure 1 The schematic diagram of the cooperative communication system model structure based on DFLC-SFC codewords is shown. After FFT processing, the expression of the received signal transformed from the time domain to the frequency domain is shown in Equation 1:

[0022] y = Fr = Σ r = 1 R h r FE ( φ r ) F H x ‾ r + n Formula 1

[0023] = Σ r ...

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Abstract

The invention discloses an LDLH matrix decomposition-based band-limited block minimum mean squared error (MMSE) equilibrium method, which simplifies a DFLC-SFC code word-based cooperative communication system model into an equivalent band-limited system model to obtain an equivalent channel matrix, and performs a series of processes such as band limitation and the like on the equivalent channel matrix to obtain a final equilibrium result. The method of the invention can keep full cooperative diversity gain and has relatively high system performance in an actual signal-to-noise ratio (SNR) range; compared with the traditional linear equilibrium method, such as zero frequency (ZF) equilibrium and MMSE equilibrium, the method has relatively low calculation complexity; meanwhile, the method is applicable to any time-frequency conversion domain-based communication system and only requires that energy for finally receiving the equivalent communication matrix in an expression of the communication system is relatively centralized, namely, the total energy is mainly distributed and centralized in an area near the leading diagonal of the equivalent channel matrix.

Description

technical field [0001] The present invention relates to the technical field of equalization in mobile communication, in particular to a linear equalization method based on distributed frequency-domain linear convolutional space-frequency codes (DFLC-SFC for short) applied to cooperative communication systems . Background technique [0002] As a new technology in the field of mobile communication, cooperative communication has aroused extensive research interest. The basic idea of ​​cooperative communication is that in a multi-user scenario, multiple single-antenna transceivers can share the antennas between each other to form a "virtual antenna array"; while traditional MIMO (multiple- An input multiple-output, MIMO for short) technology, such as a space-time coding (STC for short) technology, can be extended to a distributed environment to obtain potential synergistic diversity gains. [0003] Recently, a new class of distributed codewords—distributed frequency-domain lin...

Claims

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Application Information

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IPC IPC(8): H04L25/03
Inventor 尤肖虎蒋雁翔肖俊
Owner SOUTHEAST UNIV
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