| Title of Invention |
A METHOD AND AN APPARATUS FOR HIGH DATA RATE CDMA WIRELESS COMMUNICATION |
| Abstract |
A' novel and improved method and apparatus for high rate CDMA wireless communication is described. In accordance with one embodiment of the invention, a set of individually gain adjusted subscriber channels are formed via the use of a set of orthogonal subchannel codes having a small number of PN spreading chips per orthogonal waveform period. Data lobe transmitted via one of the transmit channels is low code rate error correction encoded and sequence repeated before being modulated with one of the subchannel codes, gain adjusted, and summed with data modulated using the other subchannel codes. The resulting summed data is modulated using a user long code and a pseudorandom spreading code (PN code) and upconverted for transmission. The use of the short orthogonal codes provides interference suppression while still' allowing extensive error correction coding and repetition for time diversity to overcome the Raleigh fading commonly experienced in terrestrial wireless systems. In the exemplary embodiment of the invention provided, the set of sub-channel codes are comprised of four Walsh codes, ~ach orthogonal to the remaining set and four chips in duration. The use of four sub-channels is preferred as it allows shorter orthogonal codes to he used, however, the use of a greater number of channels and therefore longer codes is consistent with the invention. |
Documents:
1764-CHE-2005 ABSTRACT.pdf
1764-CHE-2005 CLAIMS.pdf
1764-CHE-2005 CORRESPONDENCE OTHERS.pdf
1764-CHE-2005 CORRESPONDENCE PO.pdf
1764-CHE-2005 DESCRIPTION (COMPLETE).pdf
1764-CHE-2005 DRAWINGS.pdf
1764-CHE-2005 FORM 1.pdf
1764-CHE-2005 FORM 18.pdf
1764-CHE-2005 FORM 3.pdf
1764-CHE-2005 FORM 5.pdf
1764-CHE-2005 PETITIONS.pdf
1764-CHE-2005 POWER OF ATTORNEY.pdf