Wireless communications systems and methods for direct memory access and buffering of digital signals for multiple user detection
First Claim
Patent Images
1. A communications device for detecting user transmitted symbols encoded in spread spectrum waveforms (hereinafter “
- user waveforms”
) comprisinga digital signal processor (hereinafter “
DSP”
) that processes user waveforms to determine characteristics thereof, the DSP having an associated memory and an associated direct memory access (hereinafter “
DMA”
) controller that controls access to that memory, anda programmable logic device (hereinafter “
PLD”
) that is coupled to the DMA controller and that configures it to move data relating to user waveform characteristics from the memory to a buffer external to the DSP,wherein said user waveform characteristics comprise one or more waveform amplitudes.
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Abstract
The invention provides methods and apparatus for multiple user detection (MUD) processing that have application, for example, in improving the capacity CDMA and other wireless base stations. One aspect of the invention provides a digital signal processor (“DSP”) that processes user waveforms. The DSP has an associated memory and an associated direct memory access (“DMA”) controller that controls access to that memory. A programmable logic device (“PLD”) is coupled to the DMA controller and configures it to move data relating to user waveform characteristics from the memory to a buffer external to the DSP.
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Citations
9 Claims
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1. A communications device for detecting user transmitted symbols encoded in spread spectrum waveforms (hereinafter “
- user waveforms”
) comprisinga digital signal processor (hereinafter “
DSP”
) that processes user waveforms to determine characteristics thereof, the DSP having an associated memory and an associated direct memory access (hereinafter “
DMA”
) controller that controls access to that memory, anda programmable logic device (hereinafter “
PLD”
) that is coupled to the DMA controller and that configures it to move data relating to user waveform characteristics from the memory to a buffer external to the DSP,wherein said user waveform characteristics comprise one or more waveform amplitudes. - View Dependent Claims (2, 3, 4, 5, 6)
- user waveforms”
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7. A communications device for detecting user transmitted symbols encoded in spread spectrum waveforms (hereinafter “
- user waveforms”
) comprisinga first-in first-out buffer comprising a dual-port random access memory, a digital signal processor (hereinafter “
DSP”
) that processes user waveforms to determine characteristics thereof, the DSP having an associated memory and an associated direct access memory (hereinafter “
DMA”
) controller that controls access to that memory,a programmable logic device (hereinafter “
PLD”
) that is coupled to the DMA controller and that configures it to move data relating to user waveform characteristics from the memory to the buffer external to the DSP,wherein said user waveform characteristics comprise one or more waveform amplitudes. - View Dependent Claims (8, 9)
- user waveforms”
Specification