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Method for reducing interferes between sub-carriers in multi-carrier communication system and receiver therefor

A multi-carrier communication and sub-carrier technology, applied in the field of receivers, can solve the problems of sub-carrier signal interference and inability to maintain orthogonality

Inactive Publication Date: 2003-09-03
NEC CORP
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  • Abstract
  • Description
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Problems solved by technology

[0011] Or in the OFDM system mentioned above, although it uses mutually orthogonal subcarriers, once the waveform is distorted on multipath, the orthogonality cannot be maintained, causing signal interference between subcarriers

Method used

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  • Method for reducing interferes between sub-carriers in multi-carrier communication system and receiver therefor
  • Method for reducing interferes between sub-carriers in multi-carrier communication system and receiver therefor
  • Method for reducing interferes between sub-carriers in multi-carrier communication system and receiver therefor

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Embodiment Construction

[0034] Preferred embodiments of the present invention will be described below with reference to the accompanying drawings.

[0035] image 3 is a block diagram illustrating the configuration of a receiver in a multi-carrier communication system, which is a preferred embodiment of the present invention. refer to image 3 , the receiver of the multicarrier communication system consists of a receiving antenna 11, a receiving amplifier 12, multipliers 13 and 14, low-pass filters (LPF) 15 and 16, A / D (analog / digital) converters 17 and 18, An interference reducer 19, a multiplexer 20 and a decoder 21 are formed. Thus, the receiver configuration of the multi-carrier communication system of the preferred embodiment of the present invention includes the conventional receiver shown in FIG. 1 plus the interference reducer 19 .

[0036] In the receiver, a signal received by receiving antenna 11 is amplified by receiving amplifier 12 , undergoes quadrature demodulation with respect to r...

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Abstract

A receiver of a multicarrier communication system capable of reducing inter-subcarrier interfering signals is provided. Receive signals received by a receiving antenna are amplified by a receiving amplifier, subjected to quadrature demodulation by multipliers with respect to the respective subcarriers, and band-limited by lowpass filters. The signals band-limited by the lowpass filters are converted into digital signals by A / D converters at a sampling frequency fs. With respect to the receive signals converted into digital signals, interfering signals leaking between subcarriers are estimated by using A / D converted by the A / D converters and are canceled. The receive signals reduced in interfering signals are multiplexed into a single sequence by a multiplexer, and decoded by a decoder into output signals.

Description

technical field [0001] The present invention relates to a method for reducing inter-subcarrier interference in a multi-carrier communication system and a receiver using the method, in particular to a receiver for suppressing inter-sub-carrier interference in a multi-carrier communication system . Background technique [0002] A conventional transmitter for use in a multi-carrier communication system consists of an encoder 31 shown in FIG. 2, a demultiplexer 32, low-pass filters (LPF) 33 and 34, digital-to-analog (D / A) Converters 35 and 36, multiplexers 37 and 38, a combiner 39, a transmitting amplifier 40 and a transmitting antenna 41 are configured. [0003] A receiver for use in a multi-carrier communication system consists of a receiving antenna 201 shown in FIG. / D) Converters 207 and 208, a multiplexer 209, and a decoder 210 are configured. The transmitter and receiver mentioned above assume the use of two subcarriers. [0004] First at the transmitter, the input s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04J1/12H04B1/10H04B1/7107H04J11/00H04J13/00H04L27/26
CPCH04L27/2647
Inventor 望月孝志
Owner NEC CORP
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