Method of bit allocation in a multicarrier symbol to achieve non-periodic frequency diversity
US7724639B1 · kind B1 · utility
22Cited by
14References
2Claims
0Family size
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Key dates
| Filing date | Dec 11, 2003 |
| Grant date | May 25, 2010 |
| Priority date | — |
| Expiry date | Jan 8, 2027 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L5/0044
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
In an orthogonal frequency division multiplex (OFDM) communication system, data bits are assigned to several carriers to create frequency redundancy in the transmitted waveform. Uniformly spaced carriers occupy the frequency band of the OFDM signal. Multipath nulls caused by reflections of the transmitted signal can occur at periodic frequency intervals, for example in a coaxial cable. A non-periodic pattern of bit allocation to carriers creates frequency diversity that is resistant to periodic multipath nulls existing in the communication channel.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.