Patent EP0177963A2 successfully refreshed from Google Patents.
EP0177963A2
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Decoder for spectrum diffusion signals
Assignee: Sony Corp
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Filing: 1985-10-10
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Granted: —
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Expires: 2005-10-10
Abstract
Abstract A decoder for spectrum diffusion signals is capable of reproducing data from received a spectrum diffusion signal (SS IN ), such as sattellite communication signals without performing PN synchronization. The decoder comprises a correlation detecting means (24,) comprising a matched filter which produces a backdiffusion signal (I R ) when a received spectrum diffusion signal (SS IN ) correlates with a Gold code for a specific channel of a station, an extraction signal generator means (29) for detecting the epoch position of a peak of a triangular wave which appears in the output of the correlation detecting means (24,) when correlation between the spectrum diffusion signal (SS IN ) and the specific Gold code identifying the corresponding channel is established, and a data output extracting means (26) responsive to the extraction signal (S 2 ) to extract the back-diffusion signal (I R ) and reproduce the resulting data. In this arrangement, the extraction signal generator means (29) is responsive to the peak of the triangular-form wave in the back-diffusion signal (I R ) from the correlation detecting means (24,) to output the extraction signal (S 2 ). The extraction signal (S 2 ) is sent to the data output extraction means (26) to extract back-diffusion signal (I R ) from the output of the correlation detecting means (24,) and reproduce the data output. Therefore, according to the invention, it is unnecessary to perform PN synchronization in order to obtaining data from the spectrum diffusion signal (SS IN ).
Inventors
- 👤 Masahiro Fujita
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 14:12
CPC Classifications
H; H04; H04B; H04B1/00; H04B1/69; H04B1/707; H04B1/709; H04B1/7093
Claims Analysis
Total Claims: 31
Claim 1
Independent Claim
121 words
A decoder for spectrum diffusion signals, characterized by: a correlation means (24 I ;41) for comparing a PR N signal included in the spectrum diffusion signal (SS IN ) with a Gold code identifying a specific channel, said correlation means (24 1 ;41) producing a back-diffusion signal (I R ;MFO) when said PRN signal matches said Gold code; an extraction signal generator means (29;46) responsive to said back-diffusion signal (I R ;MFO), for producing an extraction signal (S 2 ;S 14 ) at a timing near which said back-diffusion signal value reaches a peak; and an extraction means (26;45) responsive to said extraction signal (S 2 ;S 14 ) for extracting a data signal from said back-diffusion signal (I R ;MFO).
Claim 2
Dependent Claim
121 words
A decoder for spectrum diffusion signals, characterized by: a correlation means (24 I ;41) for comparing a PR N signal included in the spectrum diffusion signal (SS IN ) with a Gold code identifying a specific channel, said correlation means (24 1 ;41) producing a back-diffusion signal (I R ;MFO) when said PRN signal matches said Gold code; an extraction signal generator means (29;46) responsive to said back-diffusion signal (I R ;MFO), for producing an extraction signal (S 2 ;S 14 ) at a timing near which said back-diffusion signal value reaches a peak; and an extraction means (26;45) responsive to said extraction signal (S 2 ;S 14 ) for extracting a data signal from said back-diffusion signal (I R ;MFO).
Claim 3
Dependent Claim
30 words
The decoder as set forth in claim 1, characterized in that said correlation means (24 I ;41) produces a triangular wave each time said PRN code matches said Gold code.
Claim 4
Dependent Claim
22 words
The decoder as set forth in claim 2, characterized further by means for forming a frequency component enveloped by said triangular signal.
Claim 5
Dependent Claim
34 words
The decoder as set forth in claim 3, characterized in that said frequency component enveloped by said triangular signal has a frequency twice as high as a carrier wave in said spectrum diffusion signal.
Claim 6
Dependent Claim
86 words
The decoder as set forth in claim 4, characterized in that said frequency component forming means comprises a voltage-controlled oscillator (22) and a multiplier (21 I ), which voltage-controlled oscillator (22) produces a local oscillation signal (LO I ) having a frequency substantially corresponding to that of said carrier wave, and which multiplier ( 21 I ) receives said spectrum diffusion signal (SS IN ) and multiplies said spectrum diffusion signal (SS IN ) by said local oscillation signal (LO I ) to form said envelope.
Claim 7
Dependent Claim
55 words
The decoder as set forth in claim 5, characterized further by an oscillation controlling means associated with said voltage-controlled oscillator (22) for controlling the latter so as to adjust the phase of said local oscillation signal (LO I ) to match the phase of said carrier wave of said spectrum diffusion signal (SS IN ).
Claim 8
Dependent Claim
204 words
The decoder as set forth in claim 6, characterized in that said oscillation control means comprises a multiplier (21 Q ) receiving said spectrum diffusion signal ((SS IN ) and a local oscillation signal (LO Q ), the phase of which is shifted by a phase-shifter (23) to a given offset from the phase of said local oscillation signal output (LO I ) by said voltage-controlled oscillator (22), a second correlation means (24 Q ) for producing a back-diffusion signal (Q R ) including a triangular wave produced when said PRN signal matches said Gold code, a filter (25 Q ) for removing high frequency components from said back-diffusion signal (Q R ) of said second correlation means (245 Q ) and outputting an envelope signal (QRX), and a holding circuit (28 Q ) receiving said envelope signal (Q RX ) and holding the signal level thereof in response to said extraction signal (S 2 ), and a multiplier (33) multiplying said reproduced data signal and the output of said holding circuit (28 Q ) so as to derive an oscillation control signal (S 3 ) for controlling the signal phase of said local oscillation signal (LO I ) of said voltage-controlled oscillator (22).
Claim 9
Dependent Claim
94 words
The decoder as set forth in claim 7, characterized in that said extraction signal generator (29) comprises a multiplier-adder (30) which derives the squares of each of said back diffusion signals (I R , Q R ) of said correlation means (24 I ) and said second correlation means (24 Q ), and then adds said squares to produce a sum indicative signal (S 1 ), and a level detector (31) responsive to said sum indicative value exceeding a given value to feed said extraction signal (S 2 ) to said extraction circuit (26).
Claim 10
Dependent Claim
94 words
The decoder as set forth in claim 3, characterized in that said frequency component forming means comprises a delay circuit (43) and a multiplier (42), said delay circuit (43) transmitting said back- diffusion signal (MFO) after a given delay time, and said multiplier (42) multiplying said back-diffusion signal (MFO) transmitted directly by said correlation means (41) with said delayed back-diffusion signal (MFOX) from said delay circuit (43) to generate said frequency components enveloped by said triangular wave and having a frequency twice as high as the carrier wave of said spectrum diffusion signal (SSIN).
Claim 11
Dependent Claim
69 words
The decoder as set forth in claim 9, characterized in that said extraction signal generator means (46) comprises an envelope detector (47) producing an envelope indicative signal (S13), and a level detector (48) for monitoring the level of said envelope indicative signal (S 13 ) and outputting said extraction signal (S 14 ) when the signal level of said envelope indicative signal (S 13 ) exceeds a given level.
Claim 12
Dependent Claim
35 words
The decoder as set forth in claim 2, characterized in that said correlation means (24 r ;41) outputs more than one triangular wave signals during a period corresponding to one cycle of said Gold code.
Claim 13
Dependent Claim
146 words
A decoder for spectrum diffusion signals, characterized by; a correlation means (24 r ; 4 1), receiving said spectrum diffusion signal (SS IN ), for comparing a PRN signal contained in said spectrum diffusion signal (SS ) with a given Gold code which identifies a communication channel, and producing a back-diffusion signal (I R ;MFO) including a data component representative of the data indicative phase-shift of said spectrum diffusion signal ( SS IN ); an extraction signal generator (29;46) associated with said correlation means (I R ;MFO) for detecting peak values of said data component and producing an extraction signal (S 2 ;S 14 ) at a timing near said peak value of said data component; and an extraction circuit (26;45), receiving saidback-diffusion signal (I R ;MFO) and responsive to said extraction signal (S2;S14) to extract said data component from said back-diffusion signal (SS IN ).
Claim 14
Dependent Claim
146 words
A decoder for spectrum diffusion signals, characterized by; a correlation means (24 r ; 4 1), receiving said spectrum diffusion signal (SS IN ), for comparing a PRN signal contained in said spectrum diffusion signal (SS ) with a given Gold code which identifies a communication channel, and producing a back-diffusion signal (I R ;MFO) including a data component representative of the data indicative phase-shift of said spectrum diffusion signal ( SS IN ); an extraction signal generator (29;46) associated with said correlation means (I R ;MFO) for detecting peak values of said data component and producing an extraction signal (S 2 ;S 14 ) at a timing near said peak value of said data component; and an extraction circuit (26;45), receiving saidback-diffusion signal (I R ;MFO) and responsive to said extraction signal (S2;S14) to extract said data component from said back-diffusion signal (SS IN ).
Claim 15
Dependent Claim
37 words
The decoder as set forth in claim 12, characterized in that said correlation means (24 I ;41) produces said data component in the form of a triangular wave each time said PRN code matches said Gold code.
Claim 16
Dependent Claim
22 words
The decoder as set forth in claim 13, characterized further by means for forming a frequency component enveloped by said triangular signal.
Claim 17
Dependent Claim
34 words
The decoder as set forth in claim 14, characterized in that said frequency component enveloped by said triangular signal has a frequency twice as high as a carrier wave in said spectrum diffusion signal.
Claim 18
Dependent Claim
85 words
The decoder as set forth in claim 15, characterized in that said frequency component forming means comprises a voltage-controlled oscillator (22) and a multiplier (21 1 ), which voltage-controlled oscillator (22) produces a local oscillation signal (LO I ) having a frequency substantially corresponding to that of said carrier wave, and which multiplier (21 I ) receives said spectrum diffusion signal (SS IN ) and multiplies said spectrum diffusion signal (SS IN ) by said local oscillation signal (LO I ) to form said envelope.
Claim 19
Dependent Claim
55 words
The decoder as set forth in claim 16, characterized further by an oscillation controlling means associated with said voltage-controlled oscillator (22) for controlling the latter so as to adjust the phase of said local oscillation signal (LO I ) to match the phase of said carrier wave of said spectrum diffusion signal (SS IN ).
Claim 20
Dependent Claim
204 words
The decoder as set forth in claim 16, characterized in that said oscillation control means comprises a multiplier (21 Q ) receiving said spectrum diffusion signal (SS IN ) and a local oscillation signal (LO Q ), the phase of which is shifted by a phase-shifter (23) to a given offset from the phase of said local oscillation signal output (LO I ) by said voltage-controlled oscillator (22), a second correlation means (24 Q ) for producing a back-diffusion signal (Q R ) including a triangular wave produced when said PRN signal matches said Gold code, a filter (25 Q ) for removing high frequency components from said back-diffusion signal (Q R ) of said second correlation means (24 Q ) and outputting an envelope signal (QRX), and a holding circuit (28 Q ) receiving said envelope signal (Q RX ) and holding the signal level thereof in response to said extraction signal (S 2 ), and a multiplier (33) multiplying said reproduced data signal and the output of said holding circuit (28 Q ) so as to derive an oscillation control signal (S 3 ) for controlling the signal phase of said local oscillation signal (LO I ) of said voltage-controlled oscillator (22).
Claim 21
Dependent Claim
92 words
The decoder as set forth in claim 18, characterized in that said extraction signal generator (29) comprises a multiplier-adder (30) which derives the squares of each of said back diffusion signals (I R ,I Q ) of said correlation means (24 1 ) and said second correlation means (24 Q ), and then adds said squares to produce a sum indicative signal (S 1 ), and a level detector (31) responsive to sum indicative value exceeding a given value to feed said extraction signal (S 2 ) to said extraction circuit (26).
Claim 22
Dependent Claim
95 words
The decoder as set forth in claim 14, characterized in that said frequency component forming means comprises a delay circuit (43) and a multiplier (42), said delay circuit (43) transmitting said back-diffusion signal (MFO) after a given delay time, and said multiplier (42) multiplying said back-diffusion signal (MFO) transmitted directly by said correlation means (41) with said delayed back-diffusion signal (MFOX) from said delay circuit (43) to generate said frequency components enveloped by said triangular wave and having a frequency twice as high as the carrier wave of said spectrum diffusion signal (SS IN ).
Claim 23
Dependent Claim
68 words
The decoder as setforth in claim 20, characterized in that said extraction signal generator means (46) comprises an envelope detector (47) producing an envelope indicative signal (S13), and a level detector (48) for monitoring the level of said envelope indicative signal (S 13 ) and outputting said extraction signal (S 14 ) when the signal level of said envelope indicative signal (S 13 ) exceeds a given level.
Claim 24
Dependent Claim
35 words
The decoder as set forth in claim 13, characterized in that said correlation means (24 1F 41) outputs more than one triangular wave signals during a period corresponding to one cycle of said Gold code.
Claim 25
Dependent Claim
121 words
A process for producing data signal from a spectrum diffusion signal characterized by the steps of: receiving said spectrum diffusion signal (SS IN ) comparing a PRN signal contained in said spectrum diffusion signal (SS IN ) with a given Gold code which identifies a communication channel, and producing a back- diffusion signal (I R ;MFO) including a data component representative of the data indicative phase-shift of said spectrum diffusion signal (SS IN ); detecting peak values of said data component and producing an extraction signal (S 2 ;S 14 ) at a timing near said peak value of said data component; and extracting said data component from said back-diffusion signal (I R ;MFO) in response to said extraction signal (S2;S14).
Claim 26
Dependent Claim
121 words
A process for producing data signal from a spectrum diffusion signal characterized by the steps of: receiving said spectrum diffusion signal (SS IN ) comparing a PRN signal contained in said spectrum diffusion signal (SS IN ) with a given Gold code which identifies a communication channel, and producing a back- diffusion signal (I R ;MFO) including a data component representative of the data indicative phase-shift of said spectrum diffusion signal (SS IN ); detecting peak values of said data component and producing an extraction signal (S 2 ;S 14 ) at a timing near said peak value of said data component; and extracting said data component from said back-diffusion signal (I R ;MFO) in response to said extraction signal (S2;S14).
Claim 27
Dependent Claim
31 words
The process as set forth in claim 23, characterized in that said data component is in the form of a triangular wave each time said PRN code matches said Gold code.
Claim 28
Dependent Claim
23 words
The process as set forth in claim 24, characterized further by a step of forming a frequency component enveloped by said triangular signal.
Claim 29
Dependent Claim
37 words
The process as set forth in claim 25, characterized in that said frequency component enveloped by said triangular signal has a frequency twice as high as a carrier wave in said spectrum diffusion signal (SS IN ).
Claim 30
Dependent Claim
60 words
The process as set forth in claim 26, characterized further by a step of controlling phase of a local oscillation signal (LO I ) utilized for forming said frequency component so as to adjust the phase of said local oscillation signal (LO I ) to match the phase of said carrier wave of said spectrum diffusion signal (SS IN ).
Claim 31
Dependent Claim
71 words
The decoder as set forth in claim 25, characterized in that said frequency component is formed by transmitting said back-diffusion signal after a given delay time, and multiplying said back-diffusion signal (MOF) transmitted directly with said delayed back-diffusion signal (MOFX) to generate said frequency components enveloped by said triangular wave and having a frequency twice as high as the carrier wave of said spectrum diffusion signal ( S S IN ).
References Cited (Backward Citations)
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