Adaptive thresholds for high speed downlink shared control channel (HS-SCCH) (part I) detection schemes
AssigneeTexas Instruments Incorporated
InventorsSuparna Datta, Anand G. Dabak, Timothy M. Schmidl
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Abstract
A technique is provided for implementing adaptive thresholds associated with HS-SCCH detection schemes; and when applied to any HS-SCCH detection scheme, the resulting false alarm probability curves are more robust to amplitude variations of the different shared control channels. The technique has low computational complexity and low storage requirements for the estimator. Such lower complexity detection schemes have been found to outperform more complex schemes when adaptive thresholds are applied.
Claims9
A shared control channel (SCCH) detection method comprising the steps of:
- descrambling a plurality of bits of a received signal on the SCCH with a sequence generated by convolutional encoding and puncturing a user identification signal to produce a plurality of descrambled bits;
- estimating an amplitude value in a transceiver associated with the descrambled bits on the SCCH;
- and
- scaling a desired threshold value by the estimated amplitude value to generate an adaptive threshold value there from, such that the adaptive threshold value is substantially robust to amplitude variations associated with at least one SCCH.
A shared control channel (SCCH) detection method comprising the steps of:
- descrambling a plurality of bits of a received signal on the SCCH with a sequence generated by convolutional encoding and puncturing a user identification signal to produce a plurality of descrambled bits;
- estimating an amplitude value in a transceiver associated with the descrambled bits;
- and
- scaling a desired threshold value by the estimated amplitude value to generate an adaptive threshold value for the SCCH.
A shared control channel (SCCH) detection method comprising the steps of:
- receiving a shared control channel vector in a transceiver, the shared control channel vector scrambled by a sequence generated by convolutional encoding and puncturing a user identification signal:
- descrambled the shared control channel vector to produce a plurality of descrambled bits;
- normalizing the descrambled bits;
- and
- applying the normalized descrambled bits to a Viterbi decoder.
Dependencies are inferred from the claim text.