EP1712009A1 - Generation de frequence pour radio a bande ultralarge basee sur mrof multibande - Google Patents

Generation de frequence pour radio a bande ultralarge basee sur mrof multibande

Info

Publication number
EP1712009A1
EP1712009A1 EP05712459A EP05712459A EP1712009A1 EP 1712009 A1 EP1712009 A1 EP 1712009A1 EP 05712459 A EP05712459 A EP 05712459A EP 05712459 A EP05712459 A EP 05712459A EP 1712009 A1 EP1712009 A1 EP 1712009A1
Authority
EP
European Patent Office
Prior art keywords
frequency
local oscillator
sub
signal
bands
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP05712459A
Other languages
German (de)
English (en)
Inventor
Helen Waite
Yifeng Zhang
Dominique Brunel
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NXP BV
Original Assignee
Koninklijke Philips Electronics NV
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Koninklijke Philips Electronics NV filed Critical Koninklijke Philips Electronics NV
Publication of EP1712009A1 publication Critical patent/EP1712009A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69—Spread spectrum techniques
    • H04B1/713—Spread spectrum techniques using frequency hopping
    • H04B1/7136—Arrangements for generation of hop frequencies, e.g. using a bank of frequency sources, using continuous tuning or using a transform
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
    • H03L7/00—Automatic control of frequency or phase; Synchronisation
    • H03L7/06—Automatic control of frequency or phase; Synchronisation using a reference signal applied to a frequency- or phase-locked loop
    • H03L7/16—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop
    • H03L7/22—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop using more than one loop
    • H03L7/23—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop using more than one loop with pulse counters or frequency dividers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
    • H04B1/40—Circuits
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
    • H04B1/40—Circuits
    • H04B1/403—Circuits using the same oscillator for generating both the transmitter frequency and the receiver local oscillator frequency
    • H04B1/406—Circuits using the same oscillator for generating both the transmitter frequency and the receiver local oscillator frequency with more than one transmission mode, e.g. analog and digital modes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2647—Arrangements specific to the receiver only

Definitions

  • the present invention relates to wideband RF communications systems, and more particularly to ultra-wideband (UWB) communications systems.
  • Ultra-Wideband Signals have been legal in the United States since February 2002 under conditions stipulated by the FCC Report and Order 02-48. Briefly, UWB signals must never be transmitted with a power spectral density of more than -41.2dBm MHz in a band from 3.1GHz to 10.7GHz. Elsewhere, the power must be reduced even further to protect existing services.
  • the transmit power is proportional to the bandwidth, and hence the desire is to occupy as much bandwidth as possible within economic and feasibility constraints and thereby maximize the possible link range.
  • MBOA Multiband OFDM Alliance
  • the MBOA-OFDM (hereinafter "MB-OFDM") system borrows heavily from the existing wireless LAN concepts for 802.1 la and 802.1 lg.
  • the OFDM signal consists of 128 sub-carriers.
  • the 128 sub-carriers are information-bearing; the others are either pilots, user-defined, or nulls.
  • the 100 information-bearing tones carry QPSK modulation, thus providing 2 bits each, or 200 bits per OFDM symbol.
  • the total gross information rate is thus (200/312.5e-9), or 640Mbps.
  • the maximum protected data rate is 480Mbps (3/4 rate code).
  • the plain use of OFDM results in an occupied spectrum of just over
  • the MB-OFDM specification uses a 3 -band hopping scheme to realize a 3 -fold increase in bandwidth.
  • the method adopted is that successive OFDM symbols are transmitted in different bands according to a predefined hopping sequence of length 6. These hopping sequences are designed to minimize collisions between uncoordinated piconets and are called Time- Frequency Interleaving (TFI) Codes.
  • TFI Time- Frequency Interleaving
  • Example sequences include ⁇ 1,2,3,1,2,3 ⁇ , ⁇ 3,2,1,3,2,1 ⁇ , ⁇ 1,1,2,2,3,3 ⁇ etc., where each index represents a specific 528MHz frequency band.
  • the following table shows how PHY-SAP data rates from 53.3 to 480Mbps are derived from the basic 640Mbps uncoded bit rate, where redundancy is introduced by three mechanisms including convolutional coding (rate 1/3, 11/32, V 2 , 5/8 and %), conjugate symmetric input to the IFFT (introduces a factor of V2), and Time spreading, where complete OFDM symbols may be repeated on different frequencies.
  • Figure 1 shows the arrangement of sub-bands in the MB-OFDM UWB proposal.
  • the sub-bands are divided into groups (group A, group B, group C and group D).
  • An initial implementation contemplates the use of the three sub-bands of group A.
  • a seven-band option has also been proposed, using the sub-bands of groups A and C.
  • Sub-bands in groups B and D are presently reserved for possible future use.
  • a block diagram is shown of a known MB-OFDM UWB receiver frequency generator for generating the following three frequencies (in MHz): 3432, 3960 and 4488.
  • a PLL 201 coupled to a local oscillator 203 generates a frequency of 4224.
  • This signal is applied to two different paths 210 and 220.
  • the first path connects the 4224 signal directly to one input of a single sideband (SSB) mixer 231.
  • An output signal of the SSB mixer is the desired center frequency, i.e., either 3432, 3960 or 4488.
  • the second path includes a further SSB mixer 221, dividers 223 and 225, and a selector 227.
  • the 4224 input signal is divided down successively by a factor of eight and again by two to produce a 264 signal applied to one input of the selector.
  • the 264 signal is also applied to one input of the SSB mixer.
  • the other input to the SSB mixer is a 528 signal obtained after the first divider 223.
  • the SSB mixer outputs a 792 signal that is applied to the other input of the selector.
  • the second path 220 generates frequencies of 264 and 792.
  • One of the frequencies is selected by the selector 227 and applied to the second input of the SSB mixer 231 to generate the desired center frequency.
  • the SSB mixer outputs signals of 4224 ⁇ 264, i.e., 4488 and 3960.
  • the SSB mixer 231 generates both sum and difference ("+1 and -1") signals, and a gating circuit is used to select the desired center frequency.
  • the SSB mixer outputs signals of 4224 ⁇ 792, i.e., 5016 (not used) and 3432.
  • SSB mixers besides having considerable area and power requirements, typically produce output signals containing significant "spurs," i.e., unwanted frequency components.
  • spurs i.e., unwanted frequency components.
  • the present invention provides for generation of at least three local oscillator signals for receiving a communication signal occupying corresponding sub- bands of a frequency band using one or more frequency synthesizers (e.g., PLLs or the like) and one or more single sideband mixers.
  • only one single sideband mixer is encountered along the output path of a given local oscillator signal, thereby reducing spurs.
  • three local oscillator signals are generated continuously.
  • Figure 1 is diagram showing the sub-band structure of the MB-OFDM UWB proposal
  • Figure 2 is a block diagram of a known MB-OFDM UWB receiver frequency generator
  • Figure 3 is a block diagram of a frequency generator in accordance with one embodiment of the present invention
  • Figure 4 is a block diagram of another embodiment of a frequency generator
  • Figure 5 is a block diagram of one variant of the frequency generator of Figure 4
  • Figure 6 is a block diagram of another variant of the frequency generator of Figure 4
  • Figure 7 is a block diagram of a further embodiment of a frequency generator
  • Figure 8 is a table summarizing operation of the frequency generator of Figure 7
  • a block diagram is shown of a frequency generator according to one embodiment of the present invention.
  • Two PLLs 310 and 320 are provided, driven by a common crystal oscillator XO.
  • a first PLL includes a first VCO,
  • VCO1 that receives a control signal 311 and produces identical output signals 313 and 315.
  • a reference divider 317 divides down an output signal of the crystal oscillator and applies the resulting signal to a frequency/phase comparator 319.
  • an output divider 318 divides down an output signal of the crystal oscillator and applies the resulting signal to the frequency/phase comparator 319.
  • the frequency/phase comparator 319 produces an error signal that is filtered by a loop filter 316 to produce the control signal 311.
  • the first PLL generates a frequency of 528, which is equal to the sub-band spacing.
  • the second PLL 320 is similar in its arrangement. In the illustrated embodiment, it generates a frequency of 3960, which is the center frequency of sub-band #2.
  • Output signals of the first and second PLLs are mixed together in a SSB mixer 331 to generate frequencies of 3432 and 4488, corresponding to sub-bands #1 and #3, respectively.
  • one or more of the NCOs may be run at some multiple of the frequencies shown with the relevant output signals being divided down. Such an arrangement may in some instances simplify the design of the VCOs.
  • frequency synthesis techniques other than PLLs such as direct digital synthesis (DDS) or delay lock loops (DLL) may be used
  • DDS direct digital synthesis
  • DLL delay lock loops
  • frequencies for two of the three sub-bands are generated directly, resulting in a reduction in spurs.
  • One of the two frequencies generated directly is sub-band #3, which can entail the most demanding spur filtering requirements due to existing spectrum uses.
  • filtering demands are reduced as compared to generating sub-band #3 using one or more SSB mixers (with resulting spurs).
  • the frequencies for sub-band #3 and sub-band #1 are again divided down by two
  • sub-bands #6-9 Four additional sub-bands available for use are sub-bands #6-9, for example, corresponding to frequencies of 6336, 6864, 7392, and 7920, respectively.
  • a clock generation circuit is shown capable of generating all of the foregoing frequencies.
  • the frequencies generated by PLL1 and PLL2 are 7392 and 12672, respectively.
  • the 7392 signal corresponds to sub-band #8 and is output directly. It is also input to a SSB mixer 701 for use in generating sub-bands #1 -3, 6, 7 and 9.
  • the 12672 signal is divided down by a programmable 1/K divider 703, where K may be 2, 3 or 6, followed by a X A divider 705.
  • An output signal of the l A divider is input to the SSB mixer.
  • the output signals generated by the SSB mixer include frequencies for sub-bands #6, 7 and 9. These latter frequencies are twice the respective frequencies of sub-bands #1, 2 and 3. Frequencies for sub-bands #1, 2 and 3 are therefore obtained by dividing by two (707) the output signal of the SSB mixer.
  • Figure 8 summarizes how the circuit of Figure 7 generates each of the frequencies involved, with the exception of sub-band #8, which is generated directly.
  • the foregoing clock generation circuits use two PLLs and one SSB mixer. Other clock generation circuits in accordance with other embodiments of the invention may use a greater or lesser number of PLLs and/or SSB mixers.
  • a clock generation circuit uses two PLLs 910 and 920 and two SSB mixers 931 and 933.
  • the first PLL generates the frequency for sub- band #3 directly.
  • the second PLL generates a frequency (1056) that is twice the sub-band spacing. This frequency is divided by two (935) to obtain a frequency (528) equal to the sub-band spacing.
  • the two SSB mixers are used to generate the frequencies for sub-bands #land 2, respectively.
  • the 4488 signal is mixed with the 1056 signal.
  • the 4488 signal mixed with the 528 signal.
  • a clock generation circuit uses a single PLL 1010 and three SSB mixers 1011, 1013, and 1015.
  • the PLL generates the frequency for sub-band #3 directly.
  • the mixers 1011 and 1013 generate the frequencies for sub-bands #1 and 2, respectively, using as one input the frequency for sub-band #3.
  • the other input is a frequency of 528 equal to the sub-band spacing (SSB mixer 1013) or a frequency of 1056 equal to twice the sub-band spacing (SSB mixer 1015).
  • the latter frequencies are generated by a string of divide-by-two dividers 1017 and the SSB mixer 1015.
  • the SSB mixer 1015 receives as inputs the frequency for sub-band #3 (4488) and the final output signal of the divider chain, which is a frequency of 264, and generates as an output signal a frequency of 4224.
  • the divider chain produces intermediate frequencies of 2112, 1056 and 528.
  • three local oscillator signals are generated continuously, simplifying system design.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
  • Transmitters (AREA)

Abstract

La présente invention concerne d'une manière générale la génération d'au moins trois signaux d'oscillateur local permettant la réception d'un signal de communication occupant des sous-bandes correspondantes d'une bande de fréquences au moyen d'un ou de plusieurs synthétiseurs de fréquence (par exemple des boucles à phase asservie ou analogue) et un ou plusieurs mélangeurs de bande latérale individuels. Selon certains modes de réalisation, seul un mélangeur de bande latéral individuel est rencontré sur le chemin de sortie d'un signal d'oscillateur local donné, réduisant ainsi les prolongements latéraux. Selon certains autres modes de réalisation, trois signaux d'oscillateur local sont générés de façon continue.
EP05712459A 2004-01-26 2005-01-26 Generation de frequence pour radio a bande ultralarge basee sur mrof multibande Withdrawn EP1712009A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US53942704P 2004-01-26 2004-01-26
US59295904P 2004-07-29 2004-07-29
PCT/US2005/003025 WO2005074152A1 (fr) 2004-01-26 2005-01-26 Generation de frequence pour radio a bande ultralarge basee sur mrof multibande

Publications (1)

Publication Number Publication Date
EP1712009A1 true EP1712009A1 (fr) 2006-10-18

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EP05712459A Withdrawn EP1712009A1 (fr) 2004-01-26 2005-01-26 Generation de frequence pour radio a bande ultralarge basee sur mrof multibande

Country Status (4)

Country Link
EP (1) EP1712009A1 (fr)
JP (1) JP2007522726A (fr)
KR (1) KR20060123583A (fr)
WO (1) WO2005074152A1 (fr)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB0518842D0 (en) * 2005-09-15 2005-10-26 Radioscape Ltd Vernier synthesiser
DE102005056952A1 (de) * 2005-11-29 2007-06-14 Infineon Technologies Ag Schaltungsanordnung und Verfahren zur Erzeugung von Lokaloszillatorsignalen und Phasenregelkreis mit der Schaltungsanordnung
US7268640B2 (en) * 2005-12-20 2007-09-11 Nokia Corporation Frequency generator arrangement
KR100897194B1 (ko) 2006-11-30 2009-05-14 (주)카이로넷 멀티모드 국부 발진기
TWI339516B (en) 2006-11-30 2011-03-21 Ind Tech Res Inst Frequency synthesizer and frequency synthesis method
US7602254B2 (en) 2007-05-25 2009-10-13 Infineon Technologies Ag System and method for generating signals with a preselected frequency relationship in two steps
CN101471662B (zh) * 2007-12-26 2012-06-06 张海英 用于OFDM UWB的6至8.2GHz五频带频率综合器
KR101614127B1 (ko) 2010-02-03 2016-04-20 삼성전자주식회사 주파수 신호 생성 장치

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Publication number Priority date Publication date Assignee Title
CA2352398C (fr) * 2000-07-06 2005-07-26 Unique Broadband Systems, Inc. Convertisseur de frequence de bruit de phase faible
GB2373113B (en) * 2001-08-24 2003-01-22 Roke Manor Research Improvements in or relating to fast frequency-hopping synthesisers
EP1434358A4 (fr) * 2001-10-03 2004-10-27 Fujitsu Ltd Appareil sans fil pouvant communiquer dans deux bandes de frequence, et procede de generation de signal d'oscillation locale dans l'appareil sans fil
EP1499030A3 (fr) * 2003-07-14 2006-02-08 Samsung Electronics Co., Ltd. Technique de génération de quadrature à bande large ne nécessitant que des composantes de bande étroite et procédé pour faire fonctionner cette technique

Non-Patent Citations (1)

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Title
See references of WO2005074152A1 *

Also Published As

Publication number Publication date
KR20060123583A (ko) 2006-12-01
WO2005074152A1 (fr) 2005-08-11
JP2007522726A (ja) 2007-08-09

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