SE544648C2 - Method to double the bandwidth in a digital receiver system by the use of frequency and amplitude coding - Google Patents

Method to double the bandwidth in a digital receiver system by the use of frequency and amplitude coding

Info

Publication number
SE544648C2
SE544648C2 SE2000152A SE2000152A SE544648C2 SE 544648 C2 SE544648 C2 SE 544648C2 SE 2000152 A SE2000152 A SE 2000152A SE 2000152 A SE2000152 A SE 2000152A SE 544648 C2 SE544648 C2 SE 544648C2
Authority
SE
Sweden
Prior art keywords
signal
frequency
amplitude
bandwidth
path
Prior art date
Application number
SE2000152A
Other languages
Swedish (sv)
Other versions
SE2000152A1 (en
Inventor
Anders Widman
Original Assignee
Anders Widman
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 Anders Widman filed Critical Anders Widman
Priority to SE2000152A priority Critical patent/SE544648C2/en
Publication of SE2000152A1 publication Critical patent/SE2000152A1/en
Publication of SE544648C2 publication Critical patent/SE544648C2/en

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/02—Channels characterised by the type of signal
    • H04L5/04—Channels characterised by the type of signal the signals being represented by different amplitudes or polarities, e.g. quadriplex
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R23/00—Arrangements for measuring frequencies; Arrangements for analysing frequency spectra
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
    • G01S7/28—Details of pulse systems
    • G01S7/285—Receivers
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
    • H03D7/00—Transference of modulation from one carrier to another, e.g. frequency-changing
    • H03D7/16—Multiple-frequency-changing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/02—Channels characterised by the type of signal
    • H04L5/06—Channels characterised by the type of signal the signals being represented by different frequencies

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Power Engineering (AREA)
  • Circuits Of Receivers In General (AREA)
  • Reduction Or Emphasis Of Bandwidth Of Signals (AREA)

Abstract

The invention is a method to increase the effective bandwidth for a digital receiver system. Many applications needs wide instantaneous bandwidth, for example applications for mobile phone communication, electronic warfare and radio systems. The invention increase the bandwidth for a System given a certain analogue to digital conversion speed by making it possible to extract the true frequencies despite double sideband conversion.The solution is to split (S1) the RF input signal in two path, mixing (M1, M2) the signal in each path with an unique local oscillator, LO, frequency (01, 02) within the band of interest giving an IF frequency pair for each RF input. The RF signal in one path is attenuated (Al) giving an amplitude unbalance of the frequency pair. The signal processing determine after signal sampling if the signal falls within the lower or upper sideband by determining if the low amplitude are higher or lower in frequency compared to the high amplitude signal.

Description

Method to double the bandwidth in a digital receiver system by the use of fregueng andamplitude coding Background and problem descriptionThe invention is a method to increase the effective bandwidth for a digital receiver system.
Many applications needs wide instantaneous bandwidth, for example applications for mobilephone communication, electronic warfare and radio systems. The invention increase thebandwidth for a System given a certain analogue to digital conversion speed by making itpossible to extract the true frequencies despite double sideband conversion. TheShannon/Nyquist sampling theorem is usually applied to determine the possible bandwidth fora given sampling rate. Shannon/Nyquist state that the sampling speed needs to be at least equalto twice the bandwidth of the signal to be sampled to unambiguously determine the signal frequency content.
The invention gives more bandwidth than the Shannon/Nyquist criteria, effectively doubling thebandwidth, on the condition that the signals to be sampled not have a very wide instantaneous bandwidth.Figure description Figure 1 describes a block diagram of an example of system design Description of the invention With reference to figure 1: The input radio frequency, RF, signal is received from the antennaand passes the input stage. The input stage can be designed in various ways known to a personskilled in the art. The invention functions with different input stage designs. In figure 1 oneexample of input stage is drawn. lt has a bandpass filter (BP1), automatic gain control, AGC,attenuator (A1) and a low noise amplifier (G1). The signal then enters the frequency andamplitude coder which is the core of the invention. Here the RF signal path is splitted in two bythe use of a splitter (S1). The signal in each path is down converted to intermediate, IF,frequency by mixer M1 and M2 and the L0:s 01 and 02. 01 and 02 have different frequenciesand are placed within the band of interest, typically in the middle of the band. ln one of thepaths an extra attenuation is inserted in order to create an amplitude unbalance between thetwo IF frequencies created by the mixing. The signal in the two paths are summed in a powercombiner (S2) and the IF are low pass filtered and then enters the digital receiver device. Theanalog to digital converter, ADC, samples the signals in the first Nyquist zone. The spectrum arethen estimated in signal processing and the information which IF is low in amplitude carries information of the signal is above or below the L0 frequencies and hence the RF input signal real frequency can be extracted for frequencies up to twice the Shannon/Nyquist sampling limit.
When IF signal is at DC an ambiguity occurs and the amplitude of the signal can't be extracted properly. Here the system can report two frequencies of which one is the true frequency.

Claims (2)

1. ClaimsA method to increase the effective bandwidth for a digital receiver system using doublesideband frequency conversion with LO frequencies within the frequency band ofinterest and amplitude coding, the method comprising the following steps: - splitting (S1) the incoming RF signal in two paths, - down converting the signals in each path to IF frequency by mixers (M1, M2) and localoscillators, LOs, (01, 02) where the LOs (01,
2. ) have different frequencies, where thefrequencies are placed within the band of interest, - amplitude coding by inserting an attenuation (A1) in one of the paths, thus creating anamplitude unbalance of the frequency pair, - summing the two paths in power combiner (S2), - filtering the combined IF signal by a low pass filter (LP1), - sampling the signal in a first Nyquist zone with an analog-to-digital converter, ADC, andfrequency and amplitude estimation by FFT or similar algorithm, - decoding if the frequency of interest origins from the lower or upper sideband byamplitude comparison if the low amplitude signal is higher or lower in frequency thanthe high amplitude signal, and thereby - extracting the RF input real frequency
SE2000152A 2020-09-08 2020-09-08 Method to double the bandwidth in a digital receiver system by the use of frequency and amplitude coding SE544648C2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
SE2000152A SE544648C2 (en) 2020-09-08 2020-09-08 Method to double the bandwidth in a digital receiver system by the use of frequency and amplitude coding

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE2000152A SE544648C2 (en) 2020-09-08 2020-09-08 Method to double the bandwidth in a digital receiver system by the use of frequency and amplitude coding

Publications (2)

Publication Number Publication Date
SE2000152A1 SE2000152A1 (en) 2022-03-09
SE544648C2 true SE544648C2 (en) 2022-10-04

Family

ID=81000024

Family Applications (1)

Application Number Title Priority Date Filing Date
SE2000152A SE544648C2 (en) 2020-09-08 2020-09-08 Method to double the bandwidth in a digital receiver system by the use of frequency and amplitude coding

Country Status (1)

Country Link
SE (1) SE544648C2 (en)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2234874A (en) * 1981-08-17 1991-02-13 Philips Electronic Associated Electronic surveillance measuring receiver
US20140105256A1 (en) * 2012-10-16 2014-04-17 Raytheon Company Band Stitching Electronic Circuits and Techniques
WO2015122098A1 (en) * 2014-02-12 2015-08-20 国立大学法人東京工業大学 ORTHOGONAL MODULATION AND DEMODULATION METHOD AND DEVICE USING COMPLEMENTARY Golay CODE
US9473158B1 (en) * 2015-09-30 2016-10-18 Lockheed Martin Corporation Radio frequency receiver with overlapped analog to digital converter (ADC) architecture
WO2019216819A1 (en) * 2018-05-11 2019-11-14 Widman Anders Method to increase the bandwidth in a digital receiver system by the use of frequency coding

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2234874A (en) * 1981-08-17 1991-02-13 Philips Electronic Associated Electronic surveillance measuring receiver
US20140105256A1 (en) * 2012-10-16 2014-04-17 Raytheon Company Band Stitching Electronic Circuits and Techniques
WO2015122098A1 (en) * 2014-02-12 2015-08-20 国立大学法人東京工業大学 ORTHOGONAL MODULATION AND DEMODULATION METHOD AND DEVICE USING COMPLEMENTARY Golay CODE
US9473158B1 (en) * 2015-09-30 2016-10-18 Lockheed Martin Corporation Radio frequency receiver with overlapped analog to digital converter (ADC) architecture
WO2019216819A1 (en) * 2018-05-11 2019-11-14 Widman Anders Method to increase the bandwidth in a digital receiver system by the use of frequency coding

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
C-H. Cheng 'Wideband receiver with I/Q channels for multiple Nyquist zone coverage', in: IET Radar, Sonar and Navigation, Vol. 9, No. 4, pp. 421-428, April 2015, doi:10.1049/iet-rsn.2014.0163 *

Also Published As

Publication number Publication date
SE2000152A1 (en) 2022-03-09

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