초록 ▼

Techniques for detecting zero rate frames in a received data transmission. A modulated signal is received and demodulated in accordance with a particular demodulation format to generate demodulated symbols. The demodulated symbols are partitioned into a number of received frames. For each received f

Techniques for detecting zero rate frames in a received data transmission. A modulated signal is received and demodulated in accordance with a particular demodulation format to generate demodulated symbols. The demodulated symbols are partitioned into a number of received frames. For each received frame, a quality metric is computed and compared against a threshold value. The threshold value is selected based, in part, on the quality metrics of received frames. Based on the comparison result, the received frame is indicated as being either transmitted and received in error (i.e., erased or bad) or not transmitted at all (i.e., zero rate or empty). The quality metric can relate to an energy of a received frame, a distance between a received frame and a codeword corresponding to the received frame, or other metrics. The threshold value can be selected based on the quality metrics computed for decoded frames or received frames identified as good, and can be dynamically adjusted based on current information available at the receiver. The method is advantageously used in a CDMA communications system.

대표청구항 ▼

[What is claimed is:] [20.]a demodulator configured to receive and demodulate a modulated signal in accordance with a particular demodulation format to generate demodulated symbols; anda data processor operatively coupled to the demodulator, the data processor configured topartition the demodulated

[What is claimed is:] [20.]a demodulator configured to receive and demodulate a modulated signal in accordance with a particular demodulation format to generate demodulated symbols; anda data processor operatively coupled to the demodulator, the data processor configured topartition the demodulated symbols into a plurality of received frames,compute a quality metric for each of the plurality of received frames,compare the quality metric for a particular received frame against a threshold value, wherein the threshold value is selected based, in part, on the quality metrics of received frames, andidentify the particular received frame as being a zero rate frame or not a zero rate frame based on the comparison.