NO930911L - RECEIVING OF FREQUENCY PARTICULAR ORTHOGONAL MULTIPLE SIGNALS - Google Patents
RECEIVING OF FREQUENCY PARTICULAR ORTHOGONAL MULTIPLE SIGNALSInfo
- Publication number
- NO930911L NO930911L NO93930911A NO930911A NO930911L NO 930911 L NO930911 L NO 930911L NO 93930911 A NO93930911 A NO 93930911A NO 930911 A NO930911 A NO 930911A NO 930911 L NO930911 L NO 930911L
- Authority
- NO
- Norway
- Prior art keywords
- demodulated
- samples
- values
- frequency
- complex
- Prior art date
Links
- 239000000969 carrier Substances 0.000 abstract 2
- 238000005070 sampling Methods 0.000 abstract 2
- 230000001360 synchronised effect Effects 0.000 abstract 1
Landscapes
- Synchronisation In Digital Transmission Systems (AREA)
Abstract
I et OFDM-signal moduleres individuelle OFDM-bærere med sampler av signaler, som kun kan ta et begrenset antall tillatte verdier, og en blokksampler modulerer gruppen av bærere i løpet av en tidsperiode T. I en mottaker kan signalet som modulerer en invididuell OFDM-bærer demoduleres ved å estimere posisjonene til referanseakser som tjener som referanseramme mot hvilken de tillatte modulerende verdiene er definert, og å multiplisere verdiene av de demodulerte samplene med den kompleks-konjugerte for et punkt på én av de estimerte referanseaksene. Spredningen av samplingsgruppene demodulert fra hver OFDM-bærer gir en indikasjon på hvorvidt mottakeren er synkronisert med blokkgrensene. Spredningen av de komplekse samplene evalueres fortrinnsvis kun i radiell retning, og benyttes til å styre samplingsklokkens frekvens. Fase-avdrift av de demodulerte samplene fra én blokk til den neste, indikerer graden av frekvensfeil i lokal oscillator. Fase-avdrift blir fortrinnsvis målt ved å multiplisere komplekse verdier med den kompleks-konjugerte for et tidligere sampel demodulert fra den samme OFDM-bæreren, og ved å benytte det resulterende måltallet til å styre den lokale oscillatorens frekvens via en frekvenslåst sløyfe.In an OFDM signal, individual OFDM carriers are modulated with samples of signals, which can only take a limited number of allowable values, and a block sampler modulates the group of carriers during a time period T. In a receiver, the signal modulating an individual OFDM carrier is demodulated by estimating the positions of reference axes which serve as a reference frame against which the allowable modulating values are defined, and multiplying the values of the demodulated samples by the complex-conjugate for a point on one of the estimated reference axes. The scattering of the sampling groups demodulated from each OFDM carrier provides an indication of whether the receiver is synchronized with the block boundaries. The scattering of the complex samples is preferably evaluated only in the radial direction, and is used to control the frequency of the sampling clock. Phase drift of the demodulated samples from one block to the next indicates the degree of frequency error in the local oscillator. Phase drift is preferably measured by multiplying complex values with the complex conjugate of a previous sample demodulated from the same OFDM carrier, and by using the resulting target number to control the frequency of the local oscillator via a frequency locked loop.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB909020170A GB9020170D0 (en) | 1990-09-14 | 1990-09-14 | Orthogonal frequency division multiplexing |
| PCT/GB1991/001571 WO1992005646A1 (en) | 1990-09-14 | 1991-09-13 | Reception of orthogonal frequency division multiplexed signals |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| NO930911D0 NO930911D0 (en) | 1993-03-12 |
| NO930911L true NO930911L (en) | 1993-03-12 |
Family
ID=26297653
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| NO93930911A NO930911L (en) | 1990-09-14 | 1993-03-12 | RECEIVING OF FREQUENCY PARTICULAR ORTHOGONAL MULTIPLE SIGNALS |
Country Status (1)
| Country | Link |
|---|---|
| NO (1) | NO930911L (en) |
-
1993
- 1993-03-12 NO NO93930911A patent/NO930911L/en not_active Application Discontinuation
Also Published As
| Publication number | Publication date |
|---|---|
| NO930911D0 (en) | 1993-03-12 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FC2A | Withdrawal, rejection or dismissal of laid open patent application |