Double-layer multi-carrier ultra-wideband wireless communication method

a multi-carrier, ultra-wideband technology, applied in digital transmission, equalisers, electrical equipment, etc., can solve the problems of increasing the time for switching between sub-frequency bands, increasing the cost of radio-frequency resources, and increasing so as to reduce the complexity of radio frequency, the effect of reducing the influence of channel and interferen

Active Publication Date: 2012-10-25
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Benefits of technology

[0015]Beneficial effects: According to the double-layer multi-carrier ultra-wideband wireless communication method provided by the invention, data are modulated to the corresponding sub-frequency bands through a digital method, and compared with the traditional MB-OFDM ultra-wideband system, only an up-converter with fixed carrier frequency is required for the transmitting end and the receiving end respectively in the method provided by the invention, therefore the complexity of radio frequency is reduced, and the cost is reduced. Meanwhile, the division and the use of sub-frequency bands in the double-layer multi-carrier system are more flexible than those of the traditional MB-OFDM ultra-wideband system; therefore the frequency spectrum resources can be more fully utilized. In addition, the joint use, selection and switching of the sub-frequency bands in the double-layer multi-carrier system are realized in digital domains, thus the flexibility and the configurability of the system are improved, and meanwhile the reliability is enhanced.
[0016]Frequency bands of all the filters in the adopted digital baseband multi-carrier modulator are in one-to-one correspondence to radio-frequency sub-frequency bands, and after the digital baseband multi-carrier modulation of the data which have been subjected to OFDM modulation, the frequency spectrum ranges are constrained by frequency responses of the corresponding filters; and actually, the task of suppressing out-of-band radiation is completed, therefore a high-order filter is not required to constrain out-of-band frequency spectrum, and the complexity and the system time delay are reduced. In Example 2, the adopted frequency band division method enables the frequency responses of two adjacent filters to be half-overlapped, which makes the transition band of the filters very wide, therefore the stopband attenuation is very large, the order is very low, and the design requirements of the filters are reduced.

Problems solved by technology

In the current carrier system scheme, an ultra-wideband frequency spectrum is divided into a plurality of sub- frequency bands which are not overlapped with one another, data can only be sent on one sub-frequency band each time, in this way, the current spare frequency spectrum resources cannot be fully and flexibly used; moreover, a plurality of up-converters with different carrier frequencies are required, therefore the radio-frequency cost is increased; or a frequency synthesizer is used, but the time for switching between sub-frequency bands is increased.
But such filter has a very high order, thus not only the design difficulty and the system cost are increased, but also the system time delay is increased.

Method used

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Examples

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embodiments

[0033]Two embodiments of the present invention are provided as follows which are used for illustrating the present invention rather than limiting the scope of the present invention.

example 1

[0034]The example, in combination with FIG. 2, is used for elaborating an embodiment of the transmitting end and the receiving end of an ultra-wideband wireless communication method with the double-layer multi-carrier characteristic.

[0035]Firstly, the division of usable frequency bands of an ultra-wideband is described:

[0036]6-9 GHz is one of the frequency ranges which can be used for the ultra-wideband and can be divided into a plurality of mutually non-overlapped sub-frequency bands, as shown in FIG. 5. In the embodiment, the fixed sub-frequency band width is Wsub=528 MHz. In order to give a simplified description, only the first six sub-frequency bands are selected as the frequency ranges to be used, the total bandwidth is Wtotal=Wsub*6=3.168 GHz, and the center frequency is fc=6 GHz+3.168 GHz / 2=7.584 GHz.

[0037]The overall structure block diagram of the system is shown in FIG. 2. Since the division and the use of the frequency ranges in the system are closely related with the dig...

example 2

[0058]The present example, in combination with FIG. 2, is used to illustrate another embodiment of the transmitting end and the receiving end of the double-layer multi-carrier ultra-wideband wireless communication method, and is mainly different from the example 1 in the division method of sub-frequency band. In the example 2, overlapping between adjacent sub-frequency bands is allowed, thereby the design of the overall system may have many changes.

[0059]Firstly, the division of usable frequency bands of the ultra-wideband is described:

[0060]6-9GHz is one of the frequency ranges which can be used for the ultra-wideband and can be divided into a plurality of mutually overlapped sub-frequency bands, as shown in FIG. 10. In the present embodiment, the sub-frequency bands have a fixed width Wsub=528 MHz. For simplified illustration, only the first 12 sub-frequency bands are selected as the frequency ranges to be used, the total bandwidth is Wtotal=Wsub*12 / 2=3.168 GHz, and the center fre...

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PUM

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Abstract

The present invention is a double-layer multi-carrier ultra-wideband wireless communication method, wherein the frequency band for ultra-wideband communication is divided into a plurality of sub-bands, then one or more sub-bands are used for data transmission, and the Orthogonal Frequency Division Multiplex (OFDM) multi-carrier transmission technology is used in each sub-band. In the transmitting party, the data symbols to be transmitted are allocated on M branches corresponding to the M sub-bands, and the OFDM modulation is implemented on the data symbols on each branch to obtain M branches of parallel data, then digital baseband multi-carrier modulation is implemented on the M branches of parallel data. Thereby, the spectrum of data on each branch is moved onto the digital sub-band corresponding to the radio sub-band one to one, so the digital baseband signal of the radio signal to be transmitted is obtained. Then, the digital signal is converted to an analog signal with a D / A conversion and an up-conversion, and the signal spectrum is moved to the radio frequency band in use, then the analog signal is amplified, filtered and transmitted via an antenna, thus the task of modulating M branches of parallel data onto M sub-bands is completed.

Description

TECHNICAL FIELD[0001]The present invention relates to a method for realizing carrier-system high-speed ultra-wideband wireless communication, in particular to a double-layer multi-carrier ultra-wideband wireless communication method, and belongs to the technical field of short-distance wireless communication and information transmission.BACKGROUND ART[0002]Great importance is attached to the ultra-wideband technology, and the extensive research on ultra-wideband technology is carried out due to its advantages of high speed rate, low power consumption and the like. The current ultra-wideband system mainly has two realization systems, namely pulse system and carrier system, wherein the carrier-system ultra-wideband technology develops faster; and the technology standard based on MB-OFDM (Multi Band Orthogonal Frequency Division Multiplexing) scheme has already been established internationally, and various experimental chips and systems have been launched. In the current carrier system...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H04B1/707H04L27/01H04B1/7097H04B1/7093
CPCH04L5/0007H04L27/2653H04L27/264H04L27/26414H04L27/26538
Inventor ZHANG, ZAICHENDANG, JIANWANG, XIAOYANBI, GUANGGUOYU, XUTAO
Owner SOUTHEAST UNIV
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