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AssigneeAgere Systems Inc.
InventorsRamin Khoini-Poorfard, Lysander B. Lim, Malcolm H. Smith
Estimating the term…
A transmit portion of a WB-CDMA transceiver generates one or more spread data streams having values represented by a single bit, allowing for filtering 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 multiplication 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 modulation 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 spread 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 a sequence of multi-bit values.
A method of applying a filter to a plurality of spread user data streams comprising the steps of:
A circuit for applying a filter to a plurality of spread user data streams comprising:
A computer-readable medium having stored thereon a plurality of instructions, the plurality of instructions including instructions which, when executed by a processor, cause the processor to implement a method for applying a filter to a plurality of spread user data streams, the method comprising the steps of:
An apparatus for applying a filter to a plurality of spread user data streams comprising:
A method of applying a filter to a plurality of spread user data streams comprising the steps of:
A method of applying a filter to a plurality of spread user data streams comprising the steps of:
A circuit for applying a filter to a plurality of spread user data streams comprising:
A circuit for applying a filter to a plurality of spread user data streams comprising:
A computer-readable medium having stored thereon a plurality of instructions, the plurality of instructions including instructions which, when executed by a processor, cause the processor to implement a method for applying a filter to a plurality of spread user data streams, the method comprising the steps of:
A computer-readable medium having stored thereon a plurality of instructions, the plurality of instructions including instructions which, when executed by a processor, cause the processor to implement a method for applying a filter to a plurality of spread user data streams, the method comprising the steps of:
An apparatus for applying a filter to a plurality of spread user data streams comprising:
An apparatus for applying a filter to a plurality of spread user data streams comprising:
Dependencies are inferred from the claim text.