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Modulating method, modulating device, demodulating method, and demodulating device

A technique of modulation method and demodulation device, which is applied in the direction of modulated carrier system, transmission system, multi-frequency code system, etc., and can solve the problems of complex demodulation processing, longer processing time, long demodulation processing time, etc.

Inactive Publication Date: 2010-09-29
SONY CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0016] In addition, when performing deinterleave processing using the memory shown in FIG. 25 when demodulating OFDM modulated signals, memory is necessary, so there is a problem that the structure of demodulation processing becomes complicated.
Also, regarding the time required for demodulation processing, Figure 26 The processing time shown is T 1 Compared with the case of processing non-interleaved data, since it takes time to read data from the memory for deinterleaving, it takes a longer demodulation processing time, and there is a problem that the demodulation processing time is long
[0017] like Figure 29 As shown, when deinterleaving is performed by wiring change processing of the parallel data output from the Fourier transform circuit, Figure 30 The processing time shown is T 2 As in the case of processing non-interleaved data, although there is no problem that the processing time becomes longer, it is still necessary to install a serial / parallel converter 5e in the output section, so there is a problem that the circuit board on which the OFDM modulation signal demodulation circuit is assembled becomes larger. question

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  • Modulating method, modulating device, demodulating method, and demodulating device
  • Modulating method, modulating device, demodulating method, and demodulating device
  • Modulating method, modulating device, demodulating method, and demodulating device

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Embodiment Construction

[0089] Below, refer to Figure 1- Figure 4 A first embodiment of the present invention will be described.

[0090] This example is applicable to a modulation unit in a transmitting device that wirelessly transmits OFDM modulated signals, and interleaves the transmitted OFDM modulated signals. FIG. 1 is a diagram showing the configuration of a modulation unit of this example. Sending data such as baseband signal a i Send to the input terminal 101, and the transmission data a obtained from the input terminal 101 i Interleaving is performed while OFDM modulation is performed.

[0091] Here, the transmission data a obtained from the input terminal 101 i It is sent to N (here, N is 64) registers 102a, 102b...102n. The N registers 102a, 102b...102n are configured as registers with address decoders. The configuration of the register with address decoder will be described later. Furthermore, the outputs of the 64 registers with address decoders 102a, 102b...102n are sent to an ...

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Abstract

There are provided selecting means (14) for selecting data on a specified point from data on N points outputted from Fourier transformation means (13) and an output order data generating means (15) for generating data for specifying the point selected by the selecting means (14). Deinterleave processing is performed in the selecting processing performed by the selecting means (14), so that an interleaved OFDM modulated signal is generated and demodulated by a simple construction in a short processing time.

Description

technical field [0001] The present invention relates to a modulation method for generating a signal modulated by Orthogonal Frequency Division Multiplexing (hereinafter referred to as OFDM), a modulation device using the modulation method, and a demodulation method for demodulating the OFDM-modulated signal and a demodulation device using the demodulation method, particularly a technology suitable for processing interleaved OFDM modulated signals. Background technique [0002] Conventionally, OFDM modulation has been put into practical use as a modulation method for transmitting large-capacity digital data by radio or the like. For example, as shown in FIG. 23, in a relatively narrow range such as a home, an office, etc., an image signal source 1 output by a tuner for receiving a TV broadcast signal and a reproduction device for reproducing an image program recorded on a recording medium is output. The image signal (digital image data) is sent to the wireless transmission d...

Claims

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Application Information

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IPC IPC(8): H04L1/00H04L27/26H04B14/00H04J11/00H03M13/27
CPCH04L27/2647
Inventor 臼居隆志
Owner SONY CORP
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