Square root raised cosine symmetric filter for mobile telecommunications
AssigneeIntel Corporation
InventorsTinku Acharya, George J. Miao
Life of this patent
Estimating the term…
Abstract
A symmetric discrete-time square-root-raised-cosine filter may be utilized to process a serial input signal and to produce an output square in each clock cycle. The filter may be adapted to decrease the computational complexity of the resulting calculations, making the filter amenable to use in power sensitive applications and in those situations where the available processor's performance is relatively limited.
Claims26
A discrete-time square-root-raised-cosine filter comprising a symmetric finite impulse response filter to generate, during transition from a passband to a stopband, an output ripple signal having a magnitude at a frequency of one half of the chip rate of about 3 decibels less than the normalized gain.
A wide band code division multiple access transceiver comprising:
- an analog processing section;
- a digital processing section coupled to said analog processing section, said digital processing section including an odd, symmetric, finite impulse response filter, said filter including a plurality of processing units implementing a systolic architecture, and said filter constructed to generate, during transition from a passband to a stopband, an output ripple signal having a magnitude at a frequency of one half of the chip rate of about 3 decibels less than the normalized gain in response to each input clock signal.
The transceiver of claim 18 wherein said filter includes a plurality of processing units, each unit including a first delay element and a multiply-accumulate circuit.
A method of implementing a code division multiple access receiver comprising:
- receiving a code division multiple access signal;
- and
- generating, during transition from a passband to a stopband, an output ripple signal having a magnitude at a frequency of one-half of the chip rate of about three decibels less than the normalized gain.
Dependencies are inferred from the claim text.