Discontinuous transmission (DTX) detection
AssigneeQUALCOMM Incorporated
InventorYu-Chuan Lin
Life of this patent
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Abstract
Novel techniques are disclosed for detecting discontinuous transmission (DTX) over a communication channel. A received data frame is characterized as one of a Good frame, Erasure, or DTX. If a Good frame is not initially detected, a multi-dimensional quality metric is used to characterize the received frame as either an Erasure or DTX. A two dimensional quality metric may be generated using energy per bit to noise power ratio as a first dimension and re-encoded symbol error count as a second dimension. Alternatively, re-encoded symbol energy may be used as the second dimension of the quality metric. The communication channel may be a CDMA wireless communication channel capable of DTX and the device may be a base station, base station controller, or mobile station.
Claims35
In a communication device, a method of detecting discontinuous transmission (DTX) comprising:
- generating a multi-dimensional quality metric;
- and
- characterizing a received frame based in part on the multi-dimensional quality metric.
In a communication device, a discontinuous transmission (DTX) detector comprising:
- means for generating a multi-dimensional quality metric;
- and
- means for characterizing a received frame based on the multi-dimensional quality metric.
A receiver capable of DTX communication comprising:
- a rake receiver capable of aligning a plurality of multipath communication signals to produce an aligned signal;
- a decoder coupled to an output of the rake receiver, the decoder capable of decoding the aligned signal to produce decoded bits;
- and
- a DTX detector coupled to an output of the decoder, the DTX detector capable of characterizing a frame of decoded bits as one of a Good frame, an Erasure, or a DTX occurrence, the DTX detector comprising:
- means for generating a multi-dimensional quality metric;
- and
- means for characterizing the frame of decoded bits based on the multi-dimensional quality metric.
Dependencies are inferred from the claim text.