Non-recursive resampling digital filter structure for demodulating 3G cellular signals
AssigneeSignum Concept, Inc.
InventorFredric Joel Harris
Life of this patent
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Abstract
A filter and processing sequence is described that efficiently combines and performs two or more tasks required to demodulate a composite 3G (third generation) wireless signal formed by a combination of wideband 3.84 MHz (UMTS or UTRA) carriers and narrowband 1.2288 MHz CDMA-2000 carriers. The three tasks, applied to each spectral component of the 3G wireless signal and described in the order of a traditional filtering structure are: Spectral translation, Bandwidth Reduction, and Sample Rate Selection. These tasks are traditionally implemented in three distinct pieces of hardware or software modules.
Claims8
A receiver for receiving and efficiently separating a composite 3-G wireless communications signal into its constituent base-band components, comprising
- combining multiple processing tasks of a conventional receiver into a single entity, wherein the entity performs the processing required for multiple channels in a single device.
A receiver structure that embeds both sample rate changes of the input data and sample rate changes of the output data, wherein interaction of the two sample rate changes is absorbed in the polyphase filter as a scheduling of input data samples being delivered to elected filter registers, the polyphase partitioned filter weights are simultaneously reassigned to different filter registers for computation of register outputs, and selected registers may not receive input samples when directed to deliver output samples.
A method for constructing overlapped spectral bands in a polyphase filter bank, comprising the step of permitting overlapped bands undistorted access to signals with spectral content located at band edges of a channelizer that does not support overlapped spectra
Dependencies are inferred from the claim text.