Receiver and receiving method

A receiving device and receiving method technology, applied to the shaping network, electrical components, transmission system, etc. in the transmitter/receiver, can solve the problems of processing time variation, complex control circuit, large circuit scale, etc., and reduce the circuit scale Effect

Inactive Publication Date: 2008-03-05
NEC CORP
View PDF1 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The first problem is that since the chip repetition synthesizer 81 needs a memory of a size corresponding to the maximum value of Q, the circuit scale is large.
The second problem is: if the chip repetition unit Q is variable, it is necessary to control the actions of the chip repetition synthesizer 81, FFT circuit 82, IFFT circuit 84, etc. according to Q, so the control circuit becomes complicated
[0012] The third problem is that if a part of the FFT circuit is used for processing according to the chip repetition unit Q, the processing time varies according to the chip repetition unit Q.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Receiver and receiving method
  • Receiver and receiving method
  • Receiver and receiving method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0036] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a block diagram showing the configuration of a receiving device according to a first embodiment of the present invention. The receiving device 10 includes an FFT circuit 11 , a weight multiplier 12 , an IFFT circuit 13 and a control circuit 14 . Similar to the conventional receiver shown in FIG. 8, this receiver 10 is configured as a receiver for receiving a signal transmitted by chip repetition by frequency domain equalization using the Code Division Multiple Access (CDMA) method. FIG. 2 shows the received signal as a time diagram. The receiver 10 sets the oversampling rate as M (M is a power of 2), sets the number of chip repetitions as R (R is a power of 2), and sets the chip repetition unit as Q (Q is a power of 2). Multiplication), for one group, the signal of M×Q chips is repeated R times for reception.

[0037] The FFT circuit 11 performs M×R...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

An FFT circuit (11) performs fast Fourier transform of a receiving signal at MRQ points, where M is the over sampling rate, Q is the chip repetition unit, and R is the chip repetition rate of the receiving signal. A weight multiplier (12) multiplies the frequency component having a frequency component number equal to integer times of R by a weighting factor for equalizing transmission line out of MRQ frequency components outputted from a fast Fourier transform circuit, and multiplies other frequency components by 0. A fast inverse Fourier transform circuit (13) receives the output from the weight multiplier (12) and performs fast inverse Fourier transform of the frequency component having a frequency component number equal to integer times of R.

Description

technical field [0001] The present invention relates to a receiving device and method, and more specifically, to receiving and using chip repetition (chip repetition) through frequency domain equalization in a transmission system that utilizes code division multiple access (CDMA) to transmit and receive signals. A receiving device and method for a signal sent by repetition). Background technique [0002] In recent years, communication of the CDMA system has been attracting attention as a communication method. As a technology related to CDMA communication, there is, for example, the technology described in JP-A-2004-297756. In this technology, at the transmitting end, the spread chip sequence is transmitted only a certain number of times in units of a certain number of chips. This situation is shown in FIG. 7 . In this example, the spread chip sequence is repeated R times for every Q chip. The repeated chip sequence is synthesized at the receiving end to restore the sprea...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): H04B1/707H04B1/712H04L25/03
Inventor 望月孝志
Owner NEC CORP
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap