CN102104381A - Frequency synthesizer for 6-9 GHz dual-carrier orthogonal frequency division multiplexing ultra-wideband - Google Patents
Frequency synthesizer for 6-9 GHz dual-carrier orthogonal frequency division multiplexing ultra-wideband Download PDFInfo
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- CN102104381A CN102104381A CN2009102427655A CN200910242765A CN102104381A CN 102104381 A CN102104381 A CN 102104381A CN 2009102427655 A CN2009102427655 A CN 2009102427655A CN 200910242765 A CN200910242765 A CN 200910242765A CN 102104381 A CN102104381 A CN 102104381A
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Abstract
The invention discloses a frequency synthesizer for a 6-9 GHz dual-carrier orthogonal frequency division multiplexing ultra-wideband, which comprises a phase-locked loop, a first multiplexer, a second multiplexer, a third multiplexer, a first single-sideband mixer, a second single-sideband mixer, a third single-sideband mixer, a fourth single-sideband mixer and a divide-by-two frequency divider, and eight pairs of carrier components and one orthogonal carrier component for 6-9 GHz dual-carrier orthogonal frequency division multiplexing ultra-wideband communication are generated. The frequency generator has the advantages of simple structure, small area and low power consumption, only comprises one phase-locked loop (the traction effect of a plurality of phase-locked loops is avoided), obtains more stable frequency, improves the frequency and the frequency hopping speed of the frequency synthesizer, and meets the requirements of a DC-OFDM UWB communication system.
Description
Technical field
The present invention relates to the broadband RF communication technical field, particularly a kind of frequency synthesizer based on two carrier wave OFDM ultra-wideband radio communications.
Background technology
Ultra broadband (Ultra-Wide band, UWB) technology is mainly used in and realizes short distance, superfast radio communication, and generally in 10m, transmission rate can reach 480Mb/s even higher to its transmission range at present.UWB high transfer rate, low-power consumption and do not disturb the characteristics of existing wireless system make UWB become now and the focus in the coming five years.
(Multi-Band Orthogonal Frequency DivisionMultiplexing, MB-OFDM) scheme is one of main implementation of present high speed ultra-wideband communications to Mb-ofdm.The MB-OFDM standard code, ofdm signal is become by 128 sub carrier group, these carrier occupancies 528MHz, available band is divided into some 528MHz sub-bands.By modulated carrier, one that in turn the base band ultra-broadband signal is moved in the above-mentioned sub-band sends.
The sub-band bandwidth of MB-OFDM UWB scheme is greater than 500MHz, and frequency spectrum uses dumb, and spectrum utilization efficiency is not high, realizes requiring high to hardware.Another kind of realization mechanism is two carrier wave OFDM (Dual-Carrier Orthogonal Frequency Division Multiplexing, DC-OFDM) super broad band radio communications.In the DC-OFDM method, the width of sub-band is 264MHz, uses the sub-band of two separation wherein to transmit the baseband OFDM signal when communication.
Frequency synthesizer is based on the important circuit module in the UWB transceiver of OFDM technology, it also is the design difficulty of whole transceiver, it need be when keeping spectral purity, can jump to another carrier wave from a carrier wave in the time in nanosecond, this is that frequency synthesizer structure institute in the traditional narrow wireless communication system is incompetent.In addition, the area of frequency synthesizer and power consumption all occupy the ratio about 50% in whole transceiver.Therefore, design a simple in structure, area is little, frequency synthesizer low in energy consumption, that satisfy frequency hopping time requirement can greatly reduce the UWB system cost undoubtedly and promote product competitiveness.At present, industrial quarters and academia still find no report on DC-OFDM UWB frequency synthesizer is realized, in particular for rare especially the mentioning of frequency synthesizer in the DC-OFDM UWB double conversion zero intermediate frequency transceiver.
Summary of the invention
(1) technical problem that will solve
In view of this, main purpose of the present invention is to provide a kind of frequency synthesizer that is used for 6 to 9GHz DC-OFDM UWB, and is more excellent to accomplish on area and power consumption simultaneously, satisfies the requirement of UWB communication system.
(2) technical scheme
For achieving the above object, the invention provides a kind of frequency synthesizer that is used for 6 to 9GHz two carrier wave OFDM ultra-widebands, this frequency synthesizer comprises that phase-locked loop, first MUX, second MUX, the 3rd MUX, first single sideband mixer, second single sideband mixer, the 3rd single sideband mixer, the 4th single sideband mixer and one remove two-divider, produces to be used for eight pairs of carrier components and quadrature carrier components that two carrier wave OFDM ultra-widebands of 6 to 9GHz are communicated by letter.
In the such scheme, this frequency synthesizer adopts direct frequency synthesis technique, in single sideband mixer, carry out the frequency operation that adds deduct by the frequency of frequency that phase-locked loop is produced and MUX output, finally export 7656 and 8184MHz, 7920 and 8448MHz, 8712 and 9240MHz, 8976 and 9504MHz, 7656 and 8712MHz, 7920 and 8976MHz, 8184 and 9240MHz, 8448 and eight pairs of carrier signals of 9504MHz and a 1320MHz quadrature carrier signal.
In the such scheme, this frequency synthesizer comprises:
Phase-locked loop, this phase-locked loop is a reference frequency signal with the 66MHz signal, includes seven in the based on feedback link successively and removes two-divider, exports stable 8448MHz orthogonal signalling to the three single sideband mixers and the 4th single sideband mixer;
First MUX is used to receive 528, the 264MHz signal, and by the control of external signal select 528 and the 264MHz signal in one the tunnel export to first single sideband mixer;
Second MUX is used to receive 1056,528MHz signal and DC component, and selects 1056, the one tunnel exports to the 3rd single sideband mixer in 528MHz signal and the DC component by the control of external signal;
The 3rd MUX is used to receive 1056,528MHz signal and DC component, and selects 1056, the one tunnel exports to the 4th single sideband mixer in 528MHz signal and the DC component by the control of external signal;
The first quadrature single sideband mixer, the frequency that is used for being received from phase-locked loop is that orthogonal signalling and the frequency that is received from first MUX of 8448MHz is that the orthogonal signalling of 528MHz or 264MHz are carried out frequency domain addition or reducing mutually, produce four orthogonal signalling, be respectively 7920MHz (=8448-528), 8184MHz (=8448-264), 8712MHz (=8448+264) and 8976MHz (=8448+528);
Second single sideband mixer and one remove two-divider, are used for the 2112MHz orthogonal signalling that receive are carried out frequency domain add operation mutually with the 528MHz orthogonal signalling, and output signal is again through removing two-divider, generation 1320MHz orthogonal signalling, i.e. f
0
The 3rd single sideband mixer and the 4th single sideband mixer, be used for being received from second MUX and the 3rd MUX 1056,528MHz and DC component carry out frequency domain addition or reducing mutually with orthogonal signalling 7920MHz, 8184MHz, 8712MHz and 8976MHz from the first quadrature single sideband mixer, obtain 7656 and 8184MHz, 7920 and 8448MHz, 8712 and 9240MHz, 8976 and 9504MHz, 7656 and 8712MHz, 7920 and 8976MHz, 8184 and 9240MHz, 8448 and 9504MHz eight couples of carrier signals, i.e. f
1And f
2
In the such scheme, described phase-locked loop adopts the orthogonal voltage-controlled vibrator that directly produces the two-way orthogonal signalling, the method for avoiding adopting the doubled frequency voltage controlled oscillator and producing orthogonal signalling by two divided-frequency.
In the such scheme, this frequency synthesizer produces the signal of each required frequency by the method that adopts direct conversion, select needed signal by MUX then, the frequency hopping speed between each frequency depends on the speed of switch, realizes the frequency hopping speed of nanosecond.
(3) beneficial effect
From technique scheme as can be seen, the present invention has following beneficial effect:
1, this frequency synthesizer that is used for 6 to 9GHz two carrier wave OFDM ultra-widebands provided by the invention, adopt a phase-locked loop, four single sideband mixers, three MUX and one to remove the UWB carrier signal that two-divider produces eight pairs 6 to 9GHz, improve the frequency and the frequency hopping speed of frequency synthesizer, satisfied the requirement of DC-OFDM UWB communication system.
2, this frequency synthesizer that is used for 6 to 9GHz two carrier wave OFDM ultra-widebands provided by the invention has only been used a phase-locked loop, has promptly avoided the traction effectiveness of a plurality of phase-locked loops, has improved frequency stability, has reduced design complexities and difficulty again.
3, this frequency synthesizer that is used for 6 to 9GHz two carrier wave OFDM ultra-widebands provided by the invention, produce the signal of needed each frequency by the way that adopts direct conversion, select the signal of needs then by a MUX, frequency hopping speed between each frequency just only depends on the switch speed of switch like this, can realize the frequency hopping speed of nanosecond fully, satisfy the requirement of UWB communication system.
4, this frequency synthesizer that is used for 6 to 9GHz two carrier wave OFDM ultra-widebands provided by the invention, phase-locked loop has adopted the quadrature VCO of direct generation I/Q two paths of signals, needing to have avoided design doubled frequency VCO to produce the method for orthogonal signalling then by two divided-frequency, thereby can adopt the lower PLL of frequency, reduce realization difficulty and the consumed current of this PLL.
5, this frequency synthesizer that is used for 6 to 9GHz two carrier wave OFDM ultra-widebands provided by the invention, the high-band frequency that produces need not orthogonal signalling, orthogonal signalling output only is provided at low-frequency range frequency place, thereby avoided the phase place of orthogonal signalling and the problem that amplitude characteristic is interfered easily, reduced design difficulty.
Description of drawings
Fig. 1 is the distribution diagram that is used for the carrier frequency of 6 to 9GHz DC-OFDM UWB provided by the invention.
Fig. 2 is the structured flowchart that is used for the frequency synthesizer of 6 to 9GHz DC-OFDM UWB provided by the invention.
Fig. 3 is the frequency relation application drawing that is used for the frequency synthesizer of 6 to 9GHz DC-OFDM UWB provided by the invention.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, below in conjunction with specific embodiment, and with reference to accompanying drawing, the present invention is described in more detail.
Shown in Figure 1 is the distribution diagram that is used for the carrier frequency of 6 to 9GHz DC-OFDM UWB provided by the invention.As we can see from the figure, 6204MHz to 8316MHz frequency range is divided into the sub-band of eight 264MHz width, and the centre frequency of this eight sub-frequency bands correspondence is (6336,6600,6864,7128,7392,7656,7920,8184) (MHz of unit).In order to obtain above-mentioned centre frequency, it is that 1320MHz (is f that the present invention selects a lower carrier frequency especially
0), thereby needing to produce eight frequencies of (7656,7920,8184,8448,8712,8976,9240,9504) (MHz of unit), corresponding simultaneously image signal drops on 8976MHz to 10824MHz.
The frequency synthesizer that is used for 6 to 9GHz two carrier wave OFDM ultra-widebands provided by the invention, comprise that phase-locked loop, first MUX, second MUX, the 3rd MUX, first single sideband mixer, second single sideband mixer, the 3rd single sideband mixer, the 4th single sideband mixer and one remove two-divider, produce and be used for eight pairs of carrier components and quadrature carrier components that two carrier wave OFDM ultra-widebands of 6 to 9GHz are communicated by letter.This frequency synthesizer adopts direct frequency synthesis technique, in single sideband mixer, carry out the frequency operation that adds deduct by the frequency of frequency that phase-locked loop is produced and MUX output, finally export 7656 and 8184MHz, 7920 and 8448MHz, 8712 and 9240MHz, 8976 and 9504MHz, 7656 and 8712MHz, 7920 and 8976MHz, 8184 and 9240MHz, 8448 and eight pairs of carrier signals of 9504MHz and a 1320MHz quadrature carrier signal.
Shown in Figure 2 is the structured flowchart that is used for the frequency synthesizer of 6 to 9GHz DC-OFDM UWB provided by the invention, and this frequency synthesizer comprises that phase-locked loop, first MUX, second MUX, the 3rd MUX, first single sideband mixer, second single sideband mixer, the 3rd single sideband mixer, the 4th single sideband mixer and one remove two-divider.
Wherein, the fixed frequency phase-locked loop, this phase-locked loop is a reference frequency signal with the 66MHz signal, includes seven in the based on feedback link successively and removes two-divider, exports stable 8448MHz orthogonal signalling to the three single sideband mixers and the 4th single sideband mixer.
First MUX, be used for receive 528, the 264MHz signal selects wherein one the tunnel to export to first single sideband mixer by external signal control
Second MUX, be used for receive 1056,528MHz signal and DC component (DC) select wherein one the tunnel to export to the 3rd single sideband mixer by external signal control;
The 3rd MUX, be used for receive 1056,528MHz signal and DC component (DC) select wherein one the tunnel to export to the 4th single sideband mixer by external signal control;
The first quadrature single sideband mixer, quadrature (I/Q) signal (frequency is 8448MHz) that is used for being received from PLL carries out frequency domain addition or reducing mutually with the orthogonal signalling (frequency is 528MHz or 264MHz) that are received from the output of first MUX, thereby produce four orthogonal signalling, be respectively 7920MHz (=8448-528), 8184MHz (=8448-264), 8712MHz (=8448+264), 8976MHz (=8448+528);
Second single sideband mixer and one remove two-divider, and 2112MHz quadrature (I/Q) signal that is used for receiving carries out frequency domain add operation mutually with the 528MHz orthogonal signalling, and output signal is again through removing two-divider, thus generation 1320MHz orthogonal signalling, i.e. f
0
The 3rd single sideband mixer and the 4th single sideband mixer, be used for being received from second MUX and the 3rd MUX 1056,528MHz and DC component carry out frequency domain addition or reducing mutually with the orthogonal signalling (7920MHz, 8184MHz, 8712MHz, 8976MHz) from the first quadrature single sideband mixer, obtain (7656,8184) (7920,8448) (8712,9240) (8976,9504) (7656,8712) (7920,8976) (8184,9240) (8448,9504) (unit is MHz) eight couples of carrier signals, i.e. (f
1, f
2);
Wherein, described phase-locked loop adopts the orthogonal voltage-controlled vibrator (QVCO) that directly produces the I/Q two paths of signals, avoid adopting doubled frequency VCO to produce the method for orthogonal signalling then by two divided-frequency, thereby adopt the lower fixed frequency phase-locked loop of frequency, reduced hardware and realized difficulty.This frequency synthesizer is selected the signal of needs then by the signal of needed each frequency of method generation of employing direct conversion by MUX, the frequency hopping speed between each frequency depends on the speed of switch, has realized the frequency hopping speed of nanosecond.Described frequency synthesizer only comprises that a phase-locked loop just can produce required eight pairs of carrier signals and a quadrature carrier signal, and the pulling effect of having avoided a plurality of phase-locked loops to cause has easily guaranteed the stability of hardware to have reduced design difficulty.
Refer again to Fig. 2, this frequency synthesizer has comprised following circuit module: 8448MHz integer P LL, three MUX, four single sideband mixers and one remove two-divider.
To provide concrete frequency synthesis scheme below:
What the PLL of 8448MHz adopted is the crystal oscillator frequency of 66MHz, frequency dividing ratio is 2 * 2 * 2 * 2 * 2 * 2 * 2, finally produced the output of 66M * 2 * 2 * 2 * 2 * 2 * 2 * 2=8448MHz, the VCO of this phase-locked loop adopts the QVCO that can directly produce the I/Q two paths of signals.The orthogonal signalling of 264MHz, 528MHz, 1056MHz and 2112MHz in the scaling-down process of this phase-locked loop, have been produced.
The 2112MHz orthogonal signalling and the 528MHz orthogonal signalling that produce among the above-mentioned PLL are passed to second single sideband mixer, produce the component 2112MHz+528MHz of frequency domain addition, be passed to next stage again and remove two-divider, generate (2112MHz+528MHz)/2=1320MHz orthogonal signalling, i.e. carrier frequency f
0
The orthogonal signalling (528MHz or 264MHz) of 8448MHz orthogonal signalling that above-mentioned PLL produces and the output of first MUX are passed to the first quadrature single sideband mixer together, the quadrature signal component that produces the frequency domain addition or subtract each other, be respectively 7920MHz (=8448-528), 8184MHz (=8448-264), 8712MHz (=8448+264), 8976MHz (=8448+528).
The 7920MHz that produces in the above-mentioned first quadrature single sideband mixer, 8184MHz, 8712MHz, the 8976MHz orthogonal signalling and first MUX are passed to second single sideband mixer and the 3rd single sideband mixer with the orthogonal signalling (1056MHz or 528MHz or DC) of second MUX output, the signal component that produces the frequency domain addition or subtract each other, obtain (7656,8184) (7920,8448) (8712,9240) (8976,9504) (7656,8712) (7920,8976) (8184,9240) (8448,9504) (unit is MHz) eight couples of carrier frequencies, i.e. (f
1, f
2), concrete frequencies operations relation sees also Fig. 3.
By the control of external signal, synchronization is realized needed frequency output to above-mentioned three MUX respectively.
This frequency synthesizer that is used for 6 to 9GHz DC-OFDM UWB provided by the invention, by adopting direct frequency synthesis technique, can export the eight pairs of carrier frequencies in (7656,8184) (7920,8448) (8712,9240) (8976,9504) (7656,8712) (7920,8976) (8184,9240) (8448,9504) (unit is MHz) and an orthogonal carrier frequencies, and the frequency hopping time between each frequency can be satisfied the fast frequency-hopped requirement of DC-OFDM UWB communication system at nanosecond order.
In addition, this frequency synthesizer has been exported an I/Q local oscillation signal and eight pairs of non-I/Q carrier signals, can be applied in the DC-OFDMUWB transceiver of double conversion zero intermediate frequency.
Above-described specific embodiment; purpose of the present invention, technical scheme and beneficial effect are further described; institute is understood that; the above only is specific embodiments of the invention; be not limited to the present invention; within the spirit and principles in the present invention all, any modification of being made, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (5)
1. frequency synthesizer that is used for 6 to 9GHz two carrier wave OFDM ultra-widebands, it is characterized in that, this frequency synthesizer comprises that phase-locked loop, first MUX, second MUX, the 3rd MUX, first single sideband mixer, second single sideband mixer, the 3rd single sideband mixer, the 4th single sideband mixer and one remove two-divider, produces to be used for eight pairs of carrier components and quadrature carrier components that two carrier wave OFDM ultra-widebands of 6 to 9GHz are communicated by letter.
2. the frequency synthesizer that is used for 6 to 9GHz two carrier wave OFDM ultra-widebands according to claim 1, it is characterized in that, this frequency synthesizer adopts direct frequency synthesis technique, in single sideband mixer, carry out the frequency operation that adds deduct by the frequency of frequency that phase-locked loop is produced and MUX output, finally export 7656 and 8184MHz, 7920 and 8448MHz, 8712 and 9240MHz, 8976 and 9504MHz, 7656 and 8712MHz, 7920 and 8976MHz, 8184 and 9240MHz, 8448 and eight pairs of carrier signals of 9504MHz and a 1320MHz quadrature carrier signal.
3. the frequency synthesizer that is used for 6 to 9GHz two carrier wave OFDM ultra-widebands according to claim 1 is characterized in that this frequency synthesizer comprises:
Phase-locked loop, this phase-locked loop is a reference frequency signal with the 66MHz signal, includes seven in the based on feedback link successively and removes two-divider, exports stable 8448MHz orthogonal signalling to the three single sideband mixers and the 4th single sideband mixer;
First MUX is used to receive 528, the 264MHz signal, and by the control of external signal select 528 and the 264MHz signal in one the tunnel export to first single sideband mixer;
Second MUX is used to receive 1056,528MHz signal and DC component, and selects 1056, the one tunnel exports to the 3rd single sideband mixer in 528MHz signal and the DC component by the control of external signal;
The 3rd MUX is used to receive 1056,528MHz signal and DC component, and selects 1056, the one tunnel exports to the 4th single sideband mixer in 528MHz signal and the DC component by the control of external signal;
The first quadrature single sideband mixer, the frequency that is used for being received from phase-locked loop is that orthogonal signalling and the frequency that is received from first MUX of 8448MHz is that the orthogonal signalling of 528MHz or 264MHz are carried out frequency domain addition or reducing mutually, produce four orthogonal signalling, be respectively 7920MHz (=8448-528), 8184MHz (=8448-264), 8712MHz (=8448+264) and 8976MHz (=8448+528);
Second single sideband mixer and one remove two-divider, are used for the 2112MHz orthogonal signalling that receive are carried out frequency domain add operation mutually with the 528MHz orthogonal signalling, and output signal is again through removing two-divider, generation 1320MHz orthogonal signalling, i.e. f
0
The 3rd single sideband mixer and the 4th single sideband mixer, be used for being received from second MUX and the 3rd MUX 1056,528MHz and DC component carry out frequency domain addition or reducing mutually with orthogonal signalling 7920MHz, 8184MHz, 8712MHz and 8976MHz from the first quadrature single sideband mixer, obtain 7656 and 8184MHz, 7920 and 8448MHz, 8712 and 9240MHz, 8976 and 9504MHz, 7656 and 8712MHz, 7920 and 8976MHz, 8184 and 9240MHz, 8448 and 9504MHz eight couples of carrier signals, i.e. f
1And f
2
4. according to claim 1 or the 3 described frequency synthesizers that are used for 6 to 9GHz two carrier wave OFDM ultra-widebands, it is characterized in that, described phase-locked loop adopts the orthogonal voltage-controlled vibrator that directly produces the two-way orthogonal signalling, the method for avoiding adopting the doubled frequency voltage controlled oscillator and producing orthogonal signalling by two divided-frequency.
5. according to claim 1 or the 3 described frequency synthesizers that are used for 6 to 9GHz two carrier wave OFDM ultra-widebands, it is characterized in that, this frequency synthesizer produces the signal of each required frequency by the method that adopts direct conversion, select needed signal by MUX then, frequency hopping speed between each frequency depends on the speed of switch, realizes the frequency hopping speed of nanosecond.
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Application publication date: 20110622 |