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US 6,333,926 B1Granted
Multiple user CDMA basestation modem
AssigneeNortel Networks Limited
InventorsFrank Martin Van Heeswyk, Paul Newson
Life of this patent
Estimating the term…
Abstract
A CDMA modem with dynamically allocatable demodulation and modulation, encoding/interleaving and decoding/de-interleaving for multiple resources users is provided. Each component is individually configurable to function as any one of various physical layer channel types for one or more different CDMA standards.
Claims15
A CDMA transmitter signal processing apparatus comprising:
- an encoder/interleaver bank having a plurality of encoder/interleavers each having an input and an output;
- a modulator bank comprising a plurality of modulators each having an input and an output, wherein each modulator is dynamically configurable to service signals adhering to one of several different standards and wherein each modulator comprises:
- a first modulator path containing BPSK modulation functions and functions for a first half of a QPSK modulator;
- a second modulator path containing functions for a second half of a QPSK modulator;
- and
- input routing circuitry switchable between a first state and a second state, which when in said first state routes entire received bit streams to the first modulator path thereby causing the configurable modulator to function in a BPSK mode, and when in said second state routes the received bit streams to said first path and to said second path thereby causing the configurable modulator to function in a QPSK mode;
- a modulator switch for connecting any encoder/interleaver output to any one or more modulator inputs;
- a plurality of summers each having a respective plurality of inputs and an output;
- and
- an output switch for connecting any modulator outputs to any summer input.
7 more elements
A CDMA transmitter signal processing apparatus comprising:
- an encoder/interleaver bank having a plurality of encoder/interleavers each having an input and an output, wherein each encoder/interleaver is dynamically configurable to service signals adhering to one of several different standards and further comprising a data interface for connecting any one of the plurality of data inputs to a respective input of one of the encoder/interleavers and wherein each configurable encoder/interleaver comprises:
- an add reserved bits block;
- an add CRC block;
- an add encoder tail block;
- a convolutional encoder block;
- a symbol repetition block;
- a symbol deletion block;
- a block interleaver block;
- and
- a long code modulation block;
- wherein each block of the encoder/interleaver is individually configurable and bypassable;
- a modulator bank comprising a plurality of modulators each having an input and an output;
- a modulator switch for connecting any encoder/interleaver output to any one or more modulator inputs;
- a plurality of summers each having a respective plurality of inputs and an output;
- and
- an output switch for connecting any modulator outputs to any summer input.
13 more elements
A CDMA receiver apparatus comprising:
- a plurality of fingers each having an input and an output;
- a switch for switching each of a plurality of receive inputs to any one or more finger inputs;
- a plurality of summers each having a respective plurality of inputs and an output;
- a weighting and thresholding circuitry connected to the outputs of the fingers and having thresholded outputs, the circuitry adapted to perform weighting and thresholding of outputs of the fingers;
- and
- an output switch adapted to connect any thresholded output to any summer input.
3 more elements
A CDMA receiver apparatus comprising:
- a plurality of fingers each having an input and an output, wherein each finger comprises three demodulators connected together in a delay locked loop, each demodulator comprising:
- a plurality of configurable functional blocks each configurable to function for at least two different standards;
- for each said standard, a respective plurality of functional blocks permanently configured to function for the standard;
- and
- switching means for switching the demodulator between different standards by configuring each configurable block to that standard, by switching in each permanently configured block for that standard, and by switching out each permanently configured block for any other standard;
- a switch for switching each of a plurality of receive inputs to any one or more finger inputs;
- a plurality of summers each having a respective plurality of inputs and an output;
- a weighting and thresholding circuitry connected to the outputs of the fingers and having thresholded outputs, the circuitry adapted to perform weighting and thresholding of outputs of the fingers;
- and
- an output switch adapted to connect any thresholded output to any summer input.
7 more elements
A CDMA receiver apparatus comprising:
- a plurality of fingers each having an input and an output;
- a switch for switching each of a plurality of receive inputs to any one or more finger inputs;
- a plurality of summers each having a respective plurality of inputs and an output;
- a weighting and thresholding circuitry connected to the outputs of the fingers and having thresholded outputs, the circuitry adapted to perform weighting and thresholding of outputs of the fingers;
- an output switch adapted to connect any thresholded output to any summer input;
- a decoder/de-interleaver bank having a plurality of decoder/de-interleavers each having an input and an output;
- and
- a signal router for connecting any summer output to any decoder/de-interleaver input;
- wherein
- each decoder/de-interleaver comprises:
- a long code demodulation block;
- a block de-interleaver block;
- a symbol integration block;
- a convolutional decoder block;
- a remove encoder tail block;
- a remove and check CRC block;
- and
- a remove reserved bits block,
- wherein each block of the decoder/de-interleaver is individually configurable or bypassable.
16 more elements
Dependencies are inferred from the claim text.