Modulation method, modulation apparatus, demodulation apparatus, and radio communication system

A modulation method and technology for modulating signals, which can be applied to phase-modulated carrier systems, transmission systems, electrical components, etc., and can solve problems such as hindering frequency utilization efficiency
CN1810003AInactive Publication Date: 2006-07-26PANASONIC CORP
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Patent Information

Authority / Receiving Office
CN Β· China
Current Assignee / Owner
PANASONIC CORP
Publication Date
2006-07-26
Estimated Expiration
Not applicable Β· inactive patent

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Abstract

The present invention provides a first and second quadrature modulators (109,110) quadrature modulate Nyquist signals, which have been given delay differences of two and four times the symbol period, respectively, using, as a carrier, a cosine wave having a frequency that is an odd multiple of the basic frequency of Nyquist signal. A third quadrature modulator (113) quadrature modulates the modulated signals obtained by the first and second quadrature modulators (109,110), using a carrier having a predetermined frequency. In this way, a modulated signal can be obtained in which four Nyquist signals are arranged within a single symbol period (T) with no mutual interference.
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Description

technical field

[0001] The invention relates to a modulation method for improving frequency utilization efficiency, a modulation device, a demodulation device and a wireless communication system. technical background

[0002] In recent years, due to the popularization of information processing technology and the rapid development of a society called IT (Information Technology, Information Technology), there has been a demand for and increased attention to information communication. Needless to say, between society and society, even the communication facilities between individuals and society are eager to achieve high-speed and wireless. Faced with the ever-increasing demand for such mobile communications, it will also cause the depletion of abundant frequency resources.

[0003] Currently, in order to solve this problem, a spatial multilayer communication called MIMO (Multi Input Multi Output) in natural space is being developed. However, in the development of communicatio...

Claims

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