WO1996001012B1 - A method and apparatus for identifying a coded communication signal - Google Patents
A method and apparatus for identifying a coded communication signalInfo
- Publication number
- WO1996001012B1 WO1996001012B1 PCT/US1995/005373 US9505373W WO9601012B1 WO 1996001012 B1 WO1996001012 B1 WO 1996001012B1 US 9505373 W US9505373 W US 9505373W WO 9601012 B1 WO9601012 B1 WO 9601012B1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- signal
- signals
- multipath
- multipath signals
- cdma
- Prior art date
Links
- 230000000051 modifying Effects 0.000 claims abstract 7
- 238000005259 measurement Methods 0.000 claims 3
- 238000001228 spectrum Methods 0.000 claims 2
Abstract
A receiver (900) employs a method (1100) for identifying a particular coded communication signal (301) from received coded communication signals (303, 305). The receiver (900) comprises a memory device (905) and a processor (907). The memory device (905) stores information contained in the received coded communication signals (303, 305) during multiple modulation symbol time intervals (210) to produce stored information. The processor (907) then searches the stored information to identify the particular coded communication signal (301).
Claims
1 . In a receiver that receives a spread spectrum signal, a method for identifying a particular coded communication signal, the method comprising the steps of:
dividing the spread spectrum signal into a plurality of modulated time intervals; storing information contained in each of the plurality of modulated time intervals; determining a first correlation metric for each of the plurality of modulated time intervals at a first offset in time; and determining a second correlation metric for each of the plurality of modulated time intervals at a second offset in time.
30
2. The method of claim 1 , further comprising comparing each of the first and second correlation metrics to a threshold.
3. The method of claim 2, further comprising the steps of:
identifying a set of multipath signals of the particular coded communication signal; weighting each multipath signal in the set of multipath signals based on the correlation metrics to produce a set of weighted multipath signals; demodulating the set of weighted multipath signals to produce a set of demodulated multipath signals; and combining the set of demodulated multipath signals to recover the particular coded communication signal.
4. The method of claim 2, wherein the particular coded communication signal propagates through a complex channel prior to reception by the receiver.
5. The method of claim 1 , wherein the first correlation metric comprises one of an energy and a magnitude measurement .
6. The method of claim 1 , further comprising identifying the particular coded communication signal based on the correlation metrics.
7. In a receiver that receives direct sequence code division multiple access (DS-CDMA) signals, each of the DS- CDMA signals including a plurality of Walsh symbols, a method for identifying a particular DS-CDMA signal from a plurality of received DS-CDMA signals, the method comprising the steps of:
a ) storing information contained in the plurality of received DS-CDMA signals to produce stored information;
b ) searching the stored information to identify a set of multipath signals of the particular DS-CDMA signal, each multipath signal in the set of multipath signals having an associated signal metric greater than an associated signal metric of any multipath signal of the particular DS-CDMA signal not in the set of multipath signals, each of the associated signal metrics based on a first measurement for each of the Walsh symbols at a first time offset and a second measurement for each of the Walsh symbols at a second time offset;
c) demodulating the set of multipath signals to produce a set of demodulated multipath signals; and
d ) combining the set of demodulated multipath signals to recover the particular DS-CDMA signal.
8. A receiver for receiving a plurality of coded communication signals, the receiver comprising:
memory means for storing information contained in a plurality of received coded communication signals during a plurality of modulation symbol time intervals to produce stored information; and 32
processing means, operably coupled to the memory means, for determining a first and a second correlation of the modulation symbol time intervals at a respective first and second time offset for identifying a particular coded communication signal based on the first and second correlation.
9. The receiver of claim 8, wherein the processing means comprises means for searching the stored information to identify a set of multipath signals of the particular coded communication signal, wherein each multipath signal in the set of multipath signals has an associated signal metric greater than an associated signal metric of any multipath signal of the particular coded communication signal not in the set of multipath signals, each of the associated signal metrics based on the first and second correlation, and wherein the receiver further comprises:
scaling means, operably coupled to the processing means, for weighting each multipath signal in the set of multipath signals based on the associated signal metric to produce a set of weighted multipath signals;
demodulating means, operably coupled to the scaling means, for demodulating the set of weighted multipath signals to produce a set of demodulated signals; and
combining means, operably coupled to the demodulating means, for combining the set of demodulated signals to recover the particular coded communication signal. 33
10. A receiver for receiving direct sequence code division multiple access (DS-CDMA) signals, each of the DS- CDMA signals including a plurality of Walsh symbols, the receiver comprising:
a memory device for storing information contained in the DS-CDMA signals to produce stored information;
a processor, operably coupled to the memory device, the processor searching the stored information to identify a set of multipath signals of a particular DS-CDMA signal, each multipath signal in the set of multipath signals having an associated signal metric greater than an associated signal metric of any multipath signal of the particular DS-CDMA signal not in the set of multipath signals, each of the associated signal metrics based on a first and second correlation of at least one of the Walsh symbols at a respective first and second time offset;
a demodulator, operably coupled to the processor, for demodulating the set of multipath signals to produce demodulated multipath signals; and
a combiner, operably coupled to the demodulator, for combining the demodulated multipath signals to recover the particular DS-CDMA signal.
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019960701004A KR0173414B1 (en) | 1994-06-30 | 1995-05-01 | Method and apparatus for identifying a coded communication signal |
| BR9506022A BR9506022A (en) | 1994-06-30 | 1995-05-01 | Method for identifying specific encoded communication signal Process for identifying a specific ds-cdma signal among a plurality of received ds-cdma signals to receive a plurality of direct sequence code split multiple access |
| JP50312096A JP3786422B2 (en) | 1994-06-30 | 1995-05-01 | Method and apparatus for identifying encoded communication signals |
| EP95918341A EP0720794B1 (en) | 1994-06-30 | 1995-05-01 | A method and apparatus for identifying a coded communication signal |
| FI960691A FI119614B (en) | 1994-06-30 | 1996-02-15 | Method and apparatus for identifying a coded communication signal |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US08/269,403 | 1994-06-30 | ||
| US08/269,403 US5530716A (en) | 1994-06-30 | 1994-06-30 | Method and apparatus for identifying a coded communication signal |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| WO1996001012A1 WO1996001012A1 (en) | 1996-01-11 |
| WO1996001012B1 true WO1996001012B1 (en) | 1996-02-15 |
Family
ID=23027095
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/US1995/005373 WO1996001012A1 (en) | 1994-06-30 | 1995-05-01 | A method and apparatus for identifying a coded communication signal |
Country Status (9)
| Country | Link |
|---|---|
| US (1) | US5530716A (en) |
| EP (1) | EP0720794B1 (en) |
| JP (1) | JP3786422B2 (en) |
| KR (1) | KR0173414B1 (en) |
| CN (1) | CN1087527C (en) |
| BR (1) | BR9506022A (en) |
| CA (1) | CA2167709A1 (en) |
| FI (1) | FI119614B (en) |
| WO (1) | WO1996001012A1 (en) |
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-
1994
- 1994-06-30 US US08/269,403 patent/US5530716A/en not_active Expired - Lifetime
-
1995
- 1995-05-01 CN CN95190592A patent/CN1087527C/en not_active Expired - Lifetime
- 1995-05-01 JP JP50312096A patent/JP3786422B2/en not_active Expired - Lifetime
- 1995-05-01 BR BR9506022A patent/BR9506022A/en not_active IP Right Cessation
- 1995-05-01 CA CA002167709A patent/CA2167709A1/en not_active Abandoned
- 1995-05-01 WO PCT/US1995/005373 patent/WO1996001012A1/en active IP Right Grant
- 1995-05-01 EP EP95918341A patent/EP0720794B1/en not_active Expired - Lifetime
- 1995-05-01 KR KR1019960701004A patent/KR0173414B1/en not_active IP Right Cessation
-
1996
- 1996-02-15 FI FI960691A patent/FI119614B/en not_active IP Right Cessation
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