Diversity receiver device

A receiver and signal technology, applied in channel estimation, modulated carrier system, transmission system, etc., can solve the problem of high complexity of the receiver circuit

Inactive Publication Date: 2006-12-27
KK TOSHIBA
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  • Abstract
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Problems solved by technology

Therefore, in wireless communication systems using thousands of subcarriers, such as digital terrestrial broadcasting, the circuit complexity of the receiver becomes very large

Method used

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no. 2 example

[0053] FIG. 8 is a diversity receiver apparatus according to a second embodiment of the present invention, which is different from FIG. 1 in that it has M (M>2) beamforming units 31 to 3M. In other words, the output signals from the digital filters 15 to 18 are input to the beamforming units 31 to 3M. Beam forming units 31 to 3M have multipliers 33 to 36 and adders 37 like beam forming units 31 and 32 in FIG. 1 .

[0054] The weight setting unit 39 determines eigenvectors corresponding to the eigenvalues ​​λ1 to λ4 (λ1>λ2>λ3>λ4), which are determined by the eigenvalue decomposition unit 38 and will be compared with the largest eigenvalue The eigenvector corresponding to λ1 is set as the combination weight of the first beamforming unit 31 . In addition, the weight setting unit 39 sets the eigenvector corresponding to the second largest eigenvalue λ2 as the combination weight of the beamforming unit 32 . Similarly, later, the eigenvector corresponding to the Jth largest eigenv...

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Abstract

A diversity receiver device includes N antennas to receive OFDM signals, N digital filters to filter the signals received by the N antennas in order to reduce delay spread, K (K<=N) beamforming units configured to subject the filtered signals to a beamforming process by using combining weights, an eigen-decomposition unit configured to subject the filtered signals to eigen-decomposition to generate N eigenvalues, a weight setting unit configured to select K eigenvalues in descending order from the generated N eigenvalues in order to set eigenvectors corresponding to the K eigenvalues to the beamforming units as the combing weight, respectively, K FFT units configured to subject the output signals of the beamforming units to fast Fourier transformation to output FFT signals, and a diversity combining unit configured to combine the FFT signals.

Description

field of invention [0001] The present invention relates to diversity receiver apparatus for use in wireless communication systems employing Orthogonal Frequency Division Multiplexing (OFDM). technical background [0002] In order to increase the transmission rate and achieve robustness against delay interference, in Japan, digital terrestrial television broadcasting has adopted OFDM as its modulation method. In OFDM, data is allocated to orthogonal subcarriers on the frequency axis, thereby performing modulation. At the transmitting end of an OFDM wireless communication system, inverse fast Fourier transform (IFFT) processing is performed to transform frequency domain signals into time domain signals, while at the receiving end, fast Fourier transform (IFFT) is performed to transform time domain into frequency domain again. Forward transform (FFT). [0003] In OFDM, subcarriers can be modulated by different modulation schemes. In this way, different detection methods such...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26H04B1/16
CPCH04B7/0845H04B7/0848H04L27/2647H04L25/0204
Inventor 松冈秀浩笠见英男鹤田诚村上康
Owner KK TOSHIBA
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