CN101346887A - A wideband communications receiver and a method for receiving data frames from a wireless device in a wireless local area network - Google Patents

A wideband communications receiver and a method for receiving data frames from a wireless device in a wireless local area network Download PDF

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Publication number
CN101346887A
CN101346887A CNA2006800492298A CN200680049229A CN101346887A CN 101346887 A CN101346887 A CN 101346887A CN A2006800492298 A CNA2006800492298 A CN A2006800492298A CN 200680049229 A CN200680049229 A CN 200680049229A CN 101346887 A CN101346887 A CN 101346887A
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China
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signal
converter
difference
baseband controller
frequency
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CNA2006800492298A
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Chinese (zh)
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延斯·戴维
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Koninklijke Philips NV
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Koninklijke Philips Electronics NV
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    • 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
    • H04B1/06—Receivers
    • H04B1/16—Circuits
    • H04B1/30—Circuits for homodyne or synchrodyne receivers
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
    • H03D3/00—Demodulation of angle-, frequency- or phase- modulated oscillations
    • H03D3/006—Demodulation of angle-, frequency- or phase- modulated oscillations by sampling the oscillations and further processing the samples, e.g. by computing techniques

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  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Power Engineering (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
  • Superheterodyne Receivers (AREA)
  • Circuits Of Receivers In General (AREA)

Abstract

The invention relates to a wideband communications receiver (1), especially a receiver in a wireless local area network, comprising: - an antenna interface module (RFM) including a low noise amplifier (3, 3.1, 3.2) connected to an antenna (2, 2.1, 2.2); - an analog front-end section (AFE) including: a preceding radio frequency amplifier (5); a direct down-converter (6) for down-conversion of amplified radio frequency signals (f^) directly to baseband into differential IQ signals (IQ); a succeeding amplifier (8.1, 8.2) for amplifying the differential IQ signals (IQ) into saturation; - an baseband controller (7) directly processing the amplified IQ signals (IQ) bitwise.

Description

The method of wideband communications receiver and the wireless device receiving data frames from WLAN (wireless local area network)
Technical field
The present invention relates to a kind of wideband communications receiver, relate in particular to receiver and a kind of being used in a kind of WLAN (wireless local area network) from the method for the wireless device receiving data frames of WLAN (wireless local area network).
Background technology
Usually, wireless communication system comprises one or more baseband information signals is modulated to one or more carrier signals, sends (a plurality of) bandpass signal that obtains, and carries out demodulation to recover one or more baseband information signals at receiver.This wireless communication system is the part of the electronic installation such as pocket PC, mobile phone, digital camera.
This communication system comprises broadband receiver, its typical case adopts heterodyne or superhet technology, comprises input radio frequency signal (abbreviating RF signal or CF signal as) down-conversion or upconverts to some intermediate frequency (abbreviating IF as) or directly arrive base band (perhaps near 0Hz) and to the demodulation of IF signal or baseband signal easily.
The previous design that includes the receiver of the super-heterodyne architecture that requires IF filtering and power consumption is expensive.The Direct Conversion zero intermediate frequency reciver has improved these parameters.
Another simple scheme of tradition Direct Conversion device is at United States Patent (USP) 6,230, is described in 000.Above-mentioned direct low-converter has carried out a lot of improvement in traditional Direct Conversion design.Particularly, be used for signal transformation is comprised reversing switch to the frequency converter of base band, be used in each cycle, the RF waveform being carried out four samplings with the RF frequency.In time sampling is sued for peace and produce the average voltage of 0 degree, 90 degree, 180 degree and 270 degree.The average voltage of 0 degree is a base-band in-phase signal, and the average voltage of 90 degree is the base band orthogonal signalling.
Summary of the invention
The objective of the invention is to stipulate utmost point low complex degree, high-performance and lower powered wideband communications receiver in a kind of WLAN (wireless local area network), also stipulated a kind of being used for from the method for wireless device receiving data frames.
Solve this problem by broadband receiver that comprises the feature that claim 1 provides and the method that comprises the feature that claim 12 provides.
In each dependent claims, provided advantageous embodiment of the present invention.
The present invention includes based on as at United States Patent (USP) 6,230, the Wideband communication control processor of the direct low-converter described in 000.Specifically, wideband communications receiver comprises antenna interface module, and it comprises the low noise amplifier that is used to receive and amplify radiofrequency signal that is connected to antenna.Constituted the AFE (analog front end) part that comprises radio frequency amplifier and described low-converter, the radiofrequency signal after the amplification that is used for receiving is direct down-conversion-to base band becomes the difference IC signal that is used for baseband controller.Subsequently, amplifier is amplified to the digital input end that saturation condition is directly connected to baseband controller with difference IC signal, and this baseband controller is handled by turn to difference IQ signal.The advantage of the receiver of this structure has been to cancel traditional analog to digital converter, is a kind of very simply design.And the receiver with this structure of minimum element has unique very-high performance.Therefore, this receiver is a kind of very simple low complex degree, low-power and low-cost receiver.
In a preferred embodiment of the invention, described direct low-converter is a kind of product detector, it comprises reversing switch, this direct low-converter has the input signal in response to the radiofrequency signal after amplifying, collaborative capacitor comes input signal is partly sued for peace, and this direct low-converter also has two outputs and is used to produce difference IQ signal.This direct low-converter is at United States Patent (USP) 6,230, specifically describes in 000.Particularly, above-mentioned low-converter comprises an output, and it is that 0 degree output is used to produce base-band in-phase signal; And another output, it is that 90 degree outputs are used to produce the base band orthogonal signalling.
In another embodiment, the running rate of described reversing switch is by control input control.Reversing switch is four station rotary switches for example, and along with described control input Periodic Rotating, this control incoming frequency is four times of local frequency.Advantageously, in having the very simple receiver of simple directly low-converter, local frequency equals radio frequency signal frequency (being also referred to as carrier frequency).In other words, the control incoming frequency equals four times of radio frequency signal frequency.Because reversing switch turns to accurate radio frequency, so each capacitor is once sampled to signal at each swing circle.This means that each capacitor will be to RF amplitude tracking accurate four/one-period, and its value is kept at the remainder in cycle.0 degree and 180 degree capacitors carry out the difference summation so that in-phase signal to be provided, and 90 degree and 270 degree capacitors are sued for peace so that orthogonal signalling to be provided.
In another preferred embodiment, described local oscillator frequencies is to be determined by control voltage, this control voltage is by digital to analog converter (abbreviating DAC as), is particularly produced by the collaborative filter (especially low pass filter) subsequently of the numeral of so-called sigma-Delta DAC in baseband controller output.The integrated of local oscillator control loop in the baseband controller is one of the easiest method of saving more costs and power.Especially, saved the active element in the baseband controller.
And baseband controller preferably includes at least one device, is used for by the estimation of the signal preamble of the frame that receives being carried out phase place, time and the frequency-tracking of carrier frequency.In the case, in baseband controller, can also save more active elements.
Amplify for the difference IQ output signal to low-converter, each of described two outputs that is used for the low-converter of difference IQ signal all links to each other with amplifier.Whereby, the IQ signal after the amplification can directly link to each other with the digital over-sampled input solder joint of baseband controller (being also referred to as baseband processor).Saved extra analog to digital converter.This has simplified the hardware designs of receiver.
According to another characteristic of the invention, the output of each detector all links to each other with low pass filter, selects to be used for the associated frequency band of the input signal after the digital processing of baseband controller.
In alternate embodiment of the present invention, described antenna interface module comprises a plurality of antennas, and the duplexer that has subsequently is used to select an antenna.Advantageously, described duplexer links to each other with baseband controller, is used for by selecting a signal that is produced by choice function (for example diversity choice function of baseband controller) to determine relevant antenna.This has simplified the hardware designs of receiver.
In a word, the present invention has described a kind of low cost, high-performance and low-power solution of broadband receiver in flexibly simple mode.
Description of drawings
Fig. 1 shows based on the overall block diagram according to the structure of the broadband receiver that the radiofrequency signal that receives is direct down-conversion-to base band of the present invention.
Fig. 2 shows the possible embodiment of structure that is direct down-conversion-to the broadband receiver of base band based on the radiofrequency signal that will receive.
Label list: 1 receiver; 2 antennas; 3 low noise amplifiers; 4 band pass filters; 5 buffer amplifiers; 6 direct low-converters; 7 baseband controllers; 8 amplifiers; 9 oscillators; 10 antenna selection switchs; 11.1,11.2 low pass filters; 12 low pass filters; f RFRadiofrequency signal; f LOThe local frequency signal; f CControl input (frequency signal); U CControl voltage.
Embodiment
Fig. 1 shows has the received RF signal of being used for f RFThe overall block diagram of structure of broadband receiver 1 of antenna 2.The broadband receiver 1 that further describes can be suitable for designing the next so-called WLAN receiver of operating under the IEEE802.11b standard.This receiver can be the part of the consumer products of the cordless headphone of for example unchallenged support of distance and high data transmission rate WLAN or phone and so on.
The radiofrequency signal f that receives RFIn the low noise amplifier 3 that is connected to antenna 2, be exaggerated.Antenna 2 and low noise amplifier 3 are elements of antenna interface module RFM (being also referred to as radio frequency part) for example.Low noise amplifier 3 for example is the gain module that has less than about 20dB of about 3dB noise factor.
AFE (analog front end) part A FE comprises index zone bandpass filter 4 and buffering amplifier 5, and this buffer amplifier 5 is saved in 50 ohm of constant output impedance in subsequently the direct low-converter 6.Band pass filter 4 is operated in the bandwidth of 2400MHz to 2500MHz.Buffer amplifier 5 provides 50 ohm output impedance for the good isolation of direct low-converter 6.Directly low-converter 6 is based on United States Patent (USP) 6,230, the known direct low-converter of describing in 000.
Directly low-converter 6 will be through amplifying and filtered radiofrequency signal f RFBeing down-converted to base band becomes the difference IQ signal of the baseband controller 7 that is used for subsequently.In order to handle the IQ signal of direct low-converter 6, utilize independent amplifier 8.1 and 8.2 that the IQ signal is amplified to saturation condition.7 pairs of IQ signals through amplification of baseband controller are handled by turn, for example separate exhibition frequency, decoding, differential decoding, preamble detection, framing etc.Can directly finish this processing in the simplest mode by baseband processor.
In order to determine the channel center of direct low-converter 6, frequency converter 6 is by control input f CControl, this control input is exported the control voltage U that is produced by the numeral of baseband processor 7 CDetermine.Described control input f CBe the local frequency f of local oscillator 9 LOFour times, local frequency f wherein LOEqual radiofrequency signal f RF(being also referred to as carrier frequency).
Fig. 2 shows in detail based on the radio frequency f that will receive RFBe direct down-conversion-to the possible embodiment of structure of the broadband receiver 1 of base band.
The radiofrequency signal f that receives RFBy two antennas 2.1 with 2.2 and relevant low noise amplifier 3.1 and 3.2 enter receiver 1.And, settle selectable duplexer 10 to be used for selecting antenna 2.1 or 2.2 one.Antenna selection signals Sa generates (for example, diversity function or another possible choice function) by choice function, and sues for peace in baseband controller 7.
Radiofrequency signal f RFOut of band signal stop by the band pass filter 4 of standard.Band pass filter 4 can be known ceramic filter.So far signal path is almost represented the fore-end AFE of standard.
RF signal f subsequently RFArrive low-converter 6 through buffer amplifier 5 (its task is to guarantee for example 50 ohm constant output impedance).The output impedance of amplifier 5 has formed capacitor C1 with direct low-converter 6 low-pass first order filter to C4.Directly low-converter 6 is RF signal f RFBeing down-converted to base band becomes difference IQ signal, and this difference IQ signal is cushioned and conversion receipt end signal subsequently, and by the low pass filter chain 11.1 and 11.2 of necessary choice is provided.
Directly low-converter 6 is product detectors, and it specifically comprises reversing switch SS, and this direct low-converter has in response to the radiofrequency signal f after amplifying RFInput signal, collaborative capacitor C1 comes input signal is partly sued for peace to C4, this direct low-converter also has two output terminals A 1 and A2 is used to produce difference IQ signal.Particularly, above-mentioned low-converter 6 comprises an output terminals A 1, and it is that 0 degree output is used to produce base-band in-phase signal I; And another output terminals A 2, it is that 90 degree outputs are used to produce base band orthogonal signalling Q.
Reversing switch SS is four station rotary switches.The running rate of described reversing switch SS is by control input f CControl.Reversing switch SS is along with described control input Periodic Rotating, and f is imported in this control CBe local frequency f LOFour times.Local frequency f LOEqual radiofrequency signal f RF(being also referred to as carrier frequency).In other words, the control incoming frequency equals four times of radio frequency signal frequency.Because reversing switch SS is with accurate radio frequency f RFTurn to, so each capacitor C1 once samples to signal at each swing circle to C4.0 degree and 180 degree capacitor C1 and C2 carry out the difference summation so that in-phase signal to be provided, and 90 degree and 270 degree capacitor C3 and C4 sue for peace so that orthogonal signalling to be provided.
The output A1 and the A2 of IQ signal are exaggerated, and are limited and are fed in the baseband controller 7 as digital signal in this example.Baseband controller 7 is carried out the sampling task and with digital form the bit stream that obtains is handled subsequently, for example separates exhibition frequency, CCK decoding, differential decoding, preamble detection, framing etc.
Directly low-converter 6 need be imported f to the control frequency that channel center is determined CThis control frequency input f CProduce by low noise oscillator 9.The output frequency of local oscillator 9 or control frequency f CBe by the control voltage U CDetermine that this control voltage is to be produced by the collaborative filter 12 (especially low pass filter) subsequently of the sigma-Delta DAC in the baseband processor 7.Software and hardware in the baseband processor 7 must carry out blind sweeping to available channel by generator, selects channel and follows the tracks of phase place and frequency shift (FS).Can be for example realize this operation by the estimation (difficult) or the extra hardware of the signal preamble of the frame that receives.
Above-mentioned receiver 1 has been described a possible implementation of simplifying very much, and it comprises following selectable preferred feature:
By saving traditional PLL frequency divider and phase detectors and carrier oscillator control loop closure probably can being realized extra optimization via baseband controller 7.This structure has been saved more costs and power.
In addition, can be amplified to saturation condition to the IQ output signal of direct low-converter 6, and it is directly linked to each other with the digital over-sampled input solder joint of baseband processor 7 by amplifier 8.1 and 8.2.

Claims (20)

1. a wideband communications receiver (1), the receiver in especially a kind of WLAN (wireless local area network) comprises:
Antenna interface module (RFM), it comprises the low noise amplifier (3,3.1,3.2) that is connected to antenna (2,2.1,2.2);
AFE (analog front end) part (AFE), it comprises
Preposition radio frequency amplifier (5);
Direct low-converter (6), it is used for the radiofrequency signal (f after amplifying RF) be direct down-conversion-to base band and become difference IQ signal (IQ);
Amplifier subsequently (8.1,8.2), it is used for difference IQ signal (IQ) is amplified to saturation condition;
Baseband controller (7), it is directly handled by turn to the IQ signal (IQ) after amplifying.
2. broadband receiver as claimed in claim 1, wherein said direct low-converter (6) is a product detector, and it comprises reversing switch, and this direct low-converter has in response to the radiofrequency signal (f after amplifying RF) input signal, collaborative capacitor (C1 is to C4) comes input signal is partly sued for peace, this direct low-converter also has two outputs, and (A1 A2) is used to produce difference IQ signal (IQ).
3. broadband receiver as claimed in claim 2, one of them output (A1) are that 0 degree output is used to produce base-band in-phase signal, and another output (A2) is that 90 degree outputs are used to produce the base band orthogonal signalling.
4. as the broadband receiver of claim 2 or 3, wherein (I, (A1, A2) each all links to each other with amplifier (8.1,8.2) described two outputs Q) difference IQ signal.
5. the broadband receiver one of in the claim 2 to 4 as described above, the running rate of wherein said reversing switch is by control input (f C) control.
6. broadband receiver as claimed in claim 5, wherein said control input (f C) be local frequency (f LO) four times, local frequency (f wherein LO) equal radiofrequency signal (f RF).
7. broadband receiver as claimed in claim 6, wherein said local frequency (f LO) by control voltage (U C) determine that this control voltage is to be produced by analog to digital converter in the baseband controller (7) and filter subsequently (12).
8. the broadband receiver one of in the claim 2 to 7 as described above, wherein (A1's each detector output end A2) links to each other with low pass filter (11.1,11.2), selects to be used for difference IQ signal (I, associated frequency band Q) of baseband controller (7).
9. the broadband receiver one of in the claim 1 to 8 as described above, wherein baseband controller (7) comprises at least one device, is used for controlling input (f by the estimation to the signal preamble of the frame that receives C) phase place, time and frequency-tracking.
10. the broadband receiver one of in the claim 1 to 9 as described above, wherein said antenna interface module (RFM) comprises a plurality of antennas (2.1,2.2), these a plurality of antennas have one the duplexer subsequently (10) that is used to select in the antenna (2.1,2.2).
11. broadband receiver as claim 10, wherein said duplexer (10) links to each other with baseband controller (7), be used for determining the antenna (2.1,2.2) of being correlated with by the selection signal that the choice function by the diversity choice function of for example baseband controller (7) produces.
12. one kind is used for comprising step from the method for the wireless device receiving data frames of WLAN (wireless local area network):
Received RF signal (f RF);
To the radiofrequency signal (f that receives RF) amplify;
With the radiofrequency signal (f after amplifying RF) be direct down-conversion-to base band and become difference IQ signal (IQ);
Difference IQ signal (IQ) is amplified to saturation condition;
By baseband controller (7) IQ signal (IQ) is directly handled by turn.
13. the method as claim 12 comprises step:
Come partly suing for peace by the collaborative capacitor (C1 is to C4) of the reversing switch of direct low-converter (6) in response to the input signal of the radiofrequency signal after amplifying;
Direct two outputs of low-converter (6) (A1, A2) locate to produce difference IQ signal (I, Q).
14. the method as claim 13 comprises step:
Locating to produce base-band in-phase signal (I) as an output (A1) of 0 degree output;
Locating to produce base band orthogonal signalling (Q) as another output (A2) of 90 degree outputs.
15. the method as claim 13 or 14 comprises step:
(I, (A1, A2) each and amplifier (8.1,8.2) link to each other in described two inputs Q) with difference IQ signal.
16. the method one of in the claim 13 to 15 as described above comprises step:
By control input (f C) control the running rate of described reversing switch.
17. as the method for claim 16, wherein said control input (f C) be local frequency (f LO) four times, local frequency (f wherein LO) equal radiofrequency signal (f RF).
18. the method as claim 17 comprises step:
By control voltage (U C) determine described local frequency (f LO), this control voltage is to be produced by analog to digital converter in the baseband controller (7) and filter subsequently (12).
19. the method one of in the claim 13 to 18 as described above comprises step:
(A1 A2) links to each other with low pass filter (11.1,11.2), selects to be used for difference IQ signal (I, associated frequency band Q) of baseband controller (7) with each detector output end.
20. the method one of in the claim 12 to 19 as described above comprises step:
Carry out radiofrequency signal (f by estimation to the signal preamble of the frame that receives in the baseband controller (7) RF) phase place, time and frequency-tracking.
CNA2006800492298A 2005-12-28 2006-12-18 A wideband communications receiver and a method for receiving data frames from a wireless device in a wireless local area network Pending CN101346887A (en)

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EP05028549.3 2005-12-28

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110199494A (en) * 2017-01-19 2019-09-03 高通股份有限公司 The signaling established and reconfigured for link aggregation
US11337263B2 (en) 2017-01-19 2022-05-17 Qualcomm Incorporated Packet based link aggregation architectures

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5598860B2 (en) * 2011-09-05 2014-10-01 國防部軍備局中山科學研究院 Radio frequency exchange disturbance prevention full duplex audio broadcasting equipment
JP6512305B2 (en) 2015-12-04 2019-05-15 日本電気株式会社 Receiving circuit, receiving apparatus and receiving method

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Publication number Priority date Publication date Assignee Title
GB2287144B (en) * 1994-02-23 1998-11-18 Motorola Israel Ltd A radio device and a single-frequency radio transponder
US6230000B1 (en) * 1998-10-15 2001-05-08 Motorola Inc. Product detector and method therefor
US6711397B1 (en) * 2000-11-20 2004-03-23 Ami Semiconductor, Inc. Structures and methods for direct conversion from radio frequency modulated signals to baseband signals

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110199494A (en) * 2017-01-19 2019-09-03 高通股份有限公司 The signaling established and reconfigured for link aggregation
CN110199494B (en) * 2017-01-19 2022-03-11 高通股份有限公司 Signaling for link aggregation setup and reconfiguration
US11337263B2 (en) 2017-01-19 2022-05-17 Qualcomm Incorporated Packet based link aggregation architectures
US11722946B2 (en) 2017-01-19 2023-08-08 Qualcomm Incorporated Signaling for link aggregation setup and reconfiguration

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JP2009522837A (en) 2009-06-11
WO2007074413A1 (en) 2007-07-05

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