Space-time spreading method of cdma wireless communication

Details Space-time spreading method of cdma wireless communication Space-time spreading method of cdma wireless communication

H - Electricity

04

Q

H04Q 7/38 (2006.01) H04B 1/707 (2006.01) H04B 7/06 (2006.01)

Patent

CA 2292832

We describe a method for CDMA transmission of sets of data symbols to users that are organized into one or more user groups. Each user group is paired with a group of spreading codes, referred to as a "code group." Each set of data symbols that are destined for respective users of a given user group is transmitted in the form of two or more distinct signal sequences. Each such signal sequence is transmitted from a respective one of two or more transmitting antennas. Each signal sequence is a linear combination of spreading code sequences belonging to the corresponding code group. Within each of these linear combinations, each spreading code sequence that appears has a scalar coefficient. Each of these scalar coefficients is a linear combination of pertinent data symbols (i.e., data symbols destined for users in the given user group) or of complex conjugates of pertinent data symbols.

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