Control of power ratios for in-phase and quadrature channels in a communications system
US6337876B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 26, 1998 |
| Grant date | Jan 8, 2002 |
| Priority date | — |
| Expiry date | Aug 26, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04W52/325
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A transmitter in a radiocommunications system such as a Wideband Code Division Multiple Access (WCDMA) communications system transmits one set of data on an in-phase (I-) channel and another set of data on a quadrature (Q-) channel. The transmitter generates a gain signal, &bgr;, and multiplies the digital data associated with the Q-channel by the gain signal, &bgr;. Complexity of the multiplication operation is reduced by limiting the gain signal, &bgr;, to a finite number of values that are exactly representable by a predefined number of bits, such as 4-bit values to the right of a binary radix point. Modulation inaccuracy associated with quantization of &bgr; can be eliminated by utilizing the same quantized values of &bgr; in all components within the radiocommunications system.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.