Technique for switching between 1x and 2x oversampling rate in a td-scdma receiver
AssigneeMediaTek Singapore Pte. Ltd.
InventorsYonggang Hao, Aiguo Yan, Songsong Sun, Marko Kocic
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Abstract
A TD-SCDMA receiver is provided that includes a joint detection (JD) block receiving a first input signal from a channel estimation block for signal detection. A short channel detection (SCD) block receives the first input signal and detecting the presence/absence of an AGWN-like channel based on the first input signal from the channel estimation block. The SCD block switches the JD block between 1× and 2× oversampling rates by sending to the JD block a second input signal.
Claims19
A time division synchronous code division multiple access (TD-SCDMA) receiver comprising:
- a joint detection (JD) block receiving a first input signal from a channel estimation block for signal detection;
- and
- a short channel detection (SCD) block receiving the first input signal and detecting the presence/absence of an additive Gaussian white noise (AGWN)-like channel based on the first input signal from the channel estimation block, said SCD block switches the JD block between 1× and 2× oversampling rates by sending to the JD block a second input signal.
A method of performing time division synchronous code division multiple access (TD-SCDMA) receiver operations comprising:
- providing a joint detection (JD) block for receiving a first input signal from a channel estimation block for signal detection;
- and
- detecting the presence/absence of an additive Gaussian white noise (AGWN)-like channel based on the first input signal from the channel estimation block using a short channel detection (SCD) block, the SCD block switches the JD block between 1× and 2× oversampling rates by sending to the JD block a second input signal.
A method of performing short channel detection comprising:
- obtaining inputs from a channel estimation block;
- aligning one or more Root-Raised-Cosine (RRC) filter sequences with a desired channel impulse response (CIR) window using the inputs;
- building a sequence of active CIR using the one or more RRC filter sequences;
- calculating the detection metric for each timeslot using the sequence of active CIR;
- calculating the decision metric for each subframe;
- and
- periodically, every M subframes, reading the output of an exponential filter and comparing the filtered decision metric with a pre-defined threshold.
Dependencies are inferred from the claim text.