High-density multi-channel QAM modulator using an IDFT/IFFT and polyphase filter bank
US8731079B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Aug 5, 2011 |
| Grant date | May 20, 2014 |
| Priority date | — |
| Expiry date | Feb 25, 2032 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L27/2697
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
Methods and apparatuses are provided for increasing the frequency resolution of a multi-channel QAM modulator and using a novel IDFT/IFFT and polyphase filter bank architecture to provide a more computationally efficient and high density multi-channel QAM modulator. The implementations of the improved multi-channel QAM modulator modulate QAM symbol streams onto respective carrier signals where the frequency of each carrier signal is an integer multiple of a fraction of the input sample rate of the respective QAM symbol stream. The modulated carriers are then combined using a novel IDFT/IFFT and polyphase filter bank architecture.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.