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Signal processing apparatus and method

A signal processing device and processing device technology, applied in digital transmission systems, electrical components, modulated carrier systems, etc.

Inactive Publication Date: 2011-02-02
SONY GRP CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0015] However, it should be noted that the OFDM signal carrier used by the OFDM receiver for digital quadrature demodulation contains some errors, because this carrier is different from the carrier used by the OFDM transmitter adapted to transmit the OFDM signal

Method used

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  • Signal processing apparatus and method
  • Signal processing apparatus and method
  • Signal processing apparatus and method

Examples

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no. 1 example

[0092] [Configuration example of signal processing unit]

[0093] Figure 5 is a block diagram illustrating a configuration example of the first embodiment of the signal processing apparatus to which the present invention is applied.

[0094] exist Figure 5 In , the signal processing device is used, for example, as an OFDM receiver adapted to receive and demodulate DVB-T2 OFDM signals.

[0095] That is, in Figure 5 Among them, the signal processing device includes a time domain carrier frequency offset correction unit 21, an FFT calculation unit 22, a frequency domain carrier frequency offset correction unit 23, a rotation unit 24, a preamble signal processing unit 25 and a symbol synchronization unit 26.

[0096] The time-domain carrier frequency offset correction section 21 is supplied with an OFDM time-domain signal.

[0097] That is, the OFDM receiver extracts, for example, an OFDM signal of a channel selected by a user (OFDM signal in a frequency band associated wit...

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Abstract

The invention relates to a signal processing apparatus and method. Disclosed herein is a signal processing apparatus, including: a computation device operable to perform transform computation adapted to Fourier-transform a time domain OFDM i.e., Orthogonal Frequency Division Multiplexing signal into a frequency domain OFDM signal; a processing device operable to perform carrier frequency offset detection adapted to detect an estimated carrier frequency offset that is an error of a carrier used for demodulation of the OFDM signal; and a carrier frequency offset correction device operable to perform carrier frequency offset correction adapted to correct the carrier frequency offset of the frequency domain OFDM signal in accordance with the estimated carrier frequency offset.

Description

technical field [0001] The present invention relates to a signal processing device and method, and more specifically, for example, to a signal processing device and method for rapidly demodulating an OFDM (Orthogonal Frequency Division Multiplexing) signal. Background technique [0002] OFDM (Orthogonal Frequency Division Multiplexing) has been used for terrestrial digital broadcasting and other broadcasting as a data (signal) modulation system. [0003] OFDM performs PSK (Phase Shift Keying), QAM (Quadrature Amplitude Modulation), or other digital modulation using multiple subcarriers orthogonal to each other within a transmission frequency band, in which data is assigned to the amplitude or phase of each subcarrier. [0004] In OFDM, the transmission frequency band is divided by multiple subcarriers, which results in narrowing the frequency band of one subcarrier (wave) and slows down the modulation speed, but the overall (overall subcarriers) transmission speed remains in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26
CPCH04L27/2665H04L27/2666H04L27/2659H04L27/266H04L27/2675H04L27/2685
Inventor 小林健一后藤友谦冈本卓也拉赫兰·布鲁斯·迈克尔
Owner SONY GRP CORP
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