公开(公告)号：CA2320703C

公开(公告)日：2005-01-25

申请号：CA2320703

申请日：2000-09-26

Applicant: LUCENT TECHNOLOGIES INC

Inventor： SMITH MALCOLM HAROLD ,  KHOINI-POORFARD RAMIN ,  LIM LYSANDER B

IPC: H03H17/02 ,  H04B1/69 ,  H04B7/216 ,  H04Q7/36

Abstract: A transmit portion of a WB-CDMA transceiver generates one or more sprea d data streams having values represented by a single bit, allowing for filteri ng of spread and combined data streams with a root raised cosine (RRC) filter employing single-bit multipliers. The RRC filter is a digital filter that i) employs multiplicati on of two values in which the length of at least one value is one bit; ii) is preferably implemented with muxs or a simple logic operator; and iii) may employ upsampling and modulati on encoding of filter coefficients to reduce the coefficient length to, for example, one bit. The RRC filter may be an FIR filter having either one-bit or multi-bit coefficients, and apply RRC filtering to a spread user stream either before or after the sprea d user streams are combined. For some implementations, RRC filters are employed to filter each spread user stream prior to combining several processed user steams. For other implementations, the multi-bit valued data stream representing the combined user streams is upsampled to form an upsampled data stream of single-bit values, and RRC filtering is then applied to the upsampled data stream. Alternatively, implementations may use upsampled RRC filter coefficients that allow RRC filtering on the combined spread user streams represented as asequence of multi-bit values.

公开(公告)号：CA2320703A1

公开(公告)日：2001-04-01

申请号：CA2320703

申请日：2000-09-26

Applicant: LUCENT TECHNOLOGIES INC

Inventor： LIM LYSANDER B ,  KHOINI-POORFARD RAMIN ,  SMITH MALCOLM HAROLD

IPC: H03H17/02 ,  H04B1/69 ,  H04B7/216 ,  H04Q7/36

Abstract: A transmit portion of a WB-CDMA transceiver generates one or more sprea d data streams having values represented by a single bit, allowing for filteri ng of spread and combined data streams with a root raised cosine (RRC) filter employing single-bit multipliers. The RRC filter is a digital filter that i) employs multiplicati on of two values in which the length of at least one value is one bit; ii) is preferably implemented with muxs or a simple logic operator; and iii) may employ upsampling and modulati on encoding of filter coefficients to reduce the coefficient length to, for example, one bit. The RRC filter may be an FIR filter having either one-bit or multi-bit coefficients, and apply RRC filtering to a spread user stream either before or after the sprea d user streams are combined. For some implementations, RRC filters are employed to filter each spread user stream prior to combining several processed user steams. For other implementations, the multi-bit valued data stream representing the combined user streams is upsampled to form an upsampled data stream of single-bit values, and RRC filtering is then applied to the upsampled data stream. Alternatively, implementations may use upsampled RRC filter coefficients that allow RRC filtering on the combined spread user streams represented as asequence of multi-bit values.