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6 to 8.2 GHz five-band frequency synthesizer for OFDM UWB

A frequency synthesizer and five-band technology, applied in the field of orthogonal frequency division multiplexing wireless ultra-broadband, can solve problems such as the inability to meet the requirements of UWB communication systems, and achieve the effects of reducing spurs, increasing frequency and frequency hopping speed

Inactive Publication Date: 2009-07-01
张海英
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  • Abstract
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Problems solved by technology

[0009] Based on the above difficulties, the traditional phase-locked loop frequency synthesizer has been unable to meet the requirements of the UWB communication system

Method used

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  • 6 to 8.2 GHz five-band frequency synthesizer for OFDM UWB

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Embodiment Construction

[0032] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in further detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

[0033] Such as figure 1 as shown, figure 1 It is a structural block diagram of a 6 to 8.2GHz five-band frequency synthesizer for OFDM UWB provided by the present invention, which frequency synthesizer includes a first fixed-frequency phase-locked loop 1, a second fixed-frequency phase-locked loop 2, and a multiplexer 3. A multiphase divider by two frequency divider 4 and a single sideband mixer 5 .

[0034] Among them, the first fixed-frequency phase-locked loop 1, the first fixed-frequency phase-locked loop uses the 66MHz signal as the reference frequency signal, and the feedback link includes two frequency dividers by 2 and a frequency divider by 27 in sequence, and outputs stable 7128MHz quadrature signal to SSB mixe...

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Abstract

The invention discloses a 6-8.2 GHz five-band frequency synthesizer used for an OFDM UWB. The synthesizer comprises a first fixed-frequency phase-locked loop 1, a second fixed-frequency phase-locked loop, a multiple selector 3, a multiphase-dividing-two frequency divider 4 and a single sideband mixer 5. By adopting the direct frequency synthesis technique, the frequency synthesizer can output the local oscillator signals of the five bands frequency points of 6072 MHz, 6600 MHz, 7128 MHz, 7656 MHz and 8184 MHz; and the frequency hopping time between the frequency points at nanosecond level can be obtained, so that the demand of fast frequency hopping of the OFDM UWB communication system can be met. Moreover, IQ two-path local oscillator signals are output by the frequency synthesizer and can be applied to an UWB wireless transceiver with direct frequency conversion.

Description

technical field [0001] The invention relates to the technical field of Orthogonal Frequency Division Multiplexing (OFDM) wireless ultra-wideband (UWB), in particular to a 6-8.2GHz five-band frequency synthesizer for OFDM UWB. Background technique [0002] UWB technology is mainly used to realize short-distance, ultra-high-speed wireless communication, and its transmission distance is generally within 10m at present, and the transmission rate can reach 480M / s or even higher. The characteristics of UWB's high transmission rate, low power consumption and no interference with existing wireless systems make UWB a hot spot now and in the next five years. [0003] UWB technology has achieved two major breakthroughs. In terms of spectrum division, it has created a "coexistence" situation; in terms of transmission speed, it has truly moved towards high speed. It increases capacity by increasing bandwidth and becomes an important part of the "high-speed" revolution in wireless technol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03L7/23H04L27/26
Inventor 李志强张海英
Owner 张海英
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