Spread spectrum signal receiving method and apparatus for CDMA cellular communication
US6343094B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Jan 22, 1999 |
| Grant date | Jan 29, 2002 |
| Priority date | — |
| Expiry date | Jan 22, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B1/7093
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
An improved filter for use in a CDMA receiver having an RF front end for splitting a received signal into I and Q components, A/D converters for converting the I and Q components into I and Q digital components, a control processor for controlling the receiver, a system clock and a power supply, the improved filter including a matched filtering mechanism, wherein each filter includes: a separation mechanism to separate a digital I signal and a digital Q signal into MSB and LSB signal components; a MSB sub-portion having multiple MSB delay elements, a multiplier associated with each delay element, and a MSB adder for processing said MSB signal components; a LSB sub-portion having multiple LSB delay elements, a multiplier associated with each delay element, and a LSB adder for processing said LSB signal components, wherein said LSB sub-portion has fewer delay elements than said MSB sub-portion; a third adder for adding said processed MSB and LSB signal components to provide a filter output; and a half clock generator for supplying a half-clock signal to said LSB portion. A method of filtering a digital signal in a CDMA receiver includes dividing a digitized signal into MSB and LSB co…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.