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Receiver for orthogonal frequency division multiplexing transmission

An orthogonal frequency division and receiver technology, which is applied in the field of receivers for OFDM transmission, can solve problems such as averaging or linear interpolation of two channel estimates, and achieve fast data demodulation and reduced processing delayed effect

Inactive Publication Date: 2006-12-27
FUJITSU LTD +2
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Problems solved by technology

[0031] However, in the case where the FFT extraction position is changed between frame n and frame n+1, the following problem may arise: namely, it may not be possible to average or linearly interpolate the two channel estimates
[0040] On the other hand, in the case where the FFT extraction positions of frame n and frame n+1 are different, as seen from equations (4) to (6), the mean is the mean of channel estimates with different phase rotation amounts; therefore, This mean cannot be used "as is" to channel compensate the data symbols

Method used

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  • Receiver for orthogonal frequency division multiplexing transmission
  • Receiver for orthogonal frequency division multiplexing transmission
  • Receiver for orthogonal frequency division multiplexing transmission

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Embodiment

[0074] Figure 5 The configuration of an embodiment of a receiver in an OFDM transmission system according to the present invention is shown. exist Figure 5 In , the receiver circuit (Rx) 7 is omitted, and only a part constructed according to the features of the present invention is shown. In addition, the same reference numerals are assigned to the same components as those in FIG. 1 . The same is true in other embodiments to be described later.

[0075] exist Figure 5 Among them, as a feature, the channel estimation unit 11 has a subcarrier processing unit for each subcarrier, and in the subcarrier processing unit, the signal of each subcarrier that has undergone fast Fourier transform processing in the fast Fourier transform (FFT) circuit 10 , provided with an existing pilot pattern storage section 100, a channel estimation circuit 101 that performs channel estimation based on the pilot, a phase correction coefficient calculation circuit 102 corresponding to FFT timing...

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Abstract

Channel estimation values of pilot symbols for channel compensation of data symbols in an OFDM receiver can be used, even in cases where FFT extract position differs for each frame. The OFDM receiver is characterized in having a circuit which calculates the amount of phase rotation that is generated by the difference in timing at which the individual symbols are extract as objects of a fast Fourier transform when the fast Fourier transform processing is performed by a fast Fourier transform circuit, and further a circuit which corrects the amount of phase rotation for the channel estimation value determined by a channel estimating circuit.

Description

technical field [0001] The present invention relates to a receiver for OFDM transmission, and more particularly, to a receiver for OFDM transmission that enables high-precision channel estimation. Background technique [0002] An Orthogonal Frequency Division Multiplexing (OFDM) transmission system that makes it possible to maximize frequency utilization efficiency is used in a wireless communication system intended for high-speed data communication. [0003] In the case of an orthogonal frequency division multiplexing (hereinafter referred to simply as "OFDM") transmission system, a frequency band used is divided into a plurality of subcarriers, and each bit of data is allocated to each subcarrier for transmission. Since the subcarriers are set such that they are orthogonal to each other on the frequency axis, this system is excellent in frequency utilization efficiency. [0004] In addition, since a single subcarrier is a narrowband signal, the influence of multipath inte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/10H04J11/00H04L27/26
CPCH04L27/2665H04L25/0232H04L27/2695H04L25/022H04L27/2675
Inventor 关宏之实川大介椎崎耕太郎鹿仓义一高道透小柳宪治川合裕之
Owner FUJITSU LTD
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