Apparatus and method for processing interference between carriers as well as receiver using the same

A technology of inter-carrier interference and processing device, which is applied in the direction of shaping network, spatial transmit diversity, multiplexing communication in transmitter/receiver, etc., can solve the more serious impact of inter-carrier interference, channel estimation and inter-carrier Difficulty in suppressing interference

Inactive Publication Date: 2009-01-21
FUJITSU LTD
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Problems solved by technology

On the other hand, in a MIMO system where multiple antennas are configured at both the transmitting and receiving ends, the number of unknown channels also increases exponentially (NT×NR times), and the received signal on each receiving antenna h

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  • Apparatus and method for processing interference between carriers as well as receiver using the same
  • Apparatus and method for processing interference between carriers as well as receiver using the same
  • Apparatus and method for processing interference between carriers as well as receiver using the same

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Embodiment Construction

[0044] Exemplary embodiments of the present invention will be described below with reference to the accompanying drawings.

[0045] When the transmitter of the OFDM communication system according to the embodiment of the present invention transmits, the original information bits first pass through the encoder unit 301 and the interleaver 302, and then are symbol-mapped into PSK or QAM OFDM symbols by the symbol mapping unit 303. At the same time, in order to ensure that the receiver can accurately estimate the wireless channel, the pilot insertion unit 304 multiplexes the pilot symbols into the OFDM data and transmits them together. The pilot signal is known to the transmitter / receiver, and the position of the pilot symbols in the two-dimensional time-frequency plane is also known in advance.

[0046] In an OFDM system, the available bandwidth is effectively divided into a series of mutually orthogonal sub-channels in the frequency domain. In a given symbol period, the transm...

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Abstract

The invention provides an inter-carrier interference processing device, a method thereof and a receiver utilizing the device and the method. A reconstruction and cancellation device of the interference between carriers is applied to the receiver of a wireless communication system. The receiver comprises: a pilot frequency extraction unit, a data extraction unit, a signal channel estimation unit and an equalizer unit. The inter-carrier interference processing device comprises: a computing unit of the inter-carrier interference channel parameter for calculating the channel parameter of the channel which causes the inter-carrier interference according to the channel estimation result; a symbol judgment unit for carrying out the symbol judgment on the output and obtaining the symbol of the signal; a reconstruction unit of the inter-carrier interference for reconstructing the inter-carrier interference of the input signal according to the output of the computing unit of the inter-carrier interference channel parameter and the output of the symbol judgment unit; a cancellation processing unit for carrying out the cancellation of the reconstructed inter-carrier interference, and returning the processing result to the pilot frequency extraction unit and the data extraction unit.

Description

technical field [0001] The present invention relates to an inter-carrier interference processing device and method and a receiver using the same. Background technique [0002] In the current practical communication system, the Orthogonal Frequency Division Multiplexing (OFDM) system has many advantages, especially in the wireless environment with severe multipath fading. The OFDM system divides the entire transmission bandwidth into many narrow-band sub-channels, each of which is approximately frequency-flat fading, and the data stream on the narrow-band sub-channel has a lower transmission rate than the data stream of the entire system . In order to avoid mutual interference between different sub-channels, discrete Fourier transform (DFT) and inverse discrete Fourier transform (IDFT) techniques are usually used to realize the modulation and demodulation of symbols to be transmitted. It should be pointed out that the actual system uses Fast Fourier Transform (FFT) and Inve...

Claims

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Application Information

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IPC IPC(8): H04L27/26H04L25/03H04B1/707H04B7/04H04J11/00
Inventor 张杰田军林宏行
Owner FUJITSU LTD
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