Echo cancellation method and transceiver
AssigneeHuawei Technologies Co., Ltd.
InventorsJinshan Wang, Liming Fang, Yanbo Zhao, Yanbin Sun, Jianfei Liu, Yumeng Yang, Chao Wang
Life of this patent
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Abstract
An echo cancellation method and a transceiver to reduce dependence of a system on an enob of a DAC, and improve performance of echo cancellation. The transceiver includes an echo cancellation apparatus, a transmit link, a receive link, and a hybrid circuit. The transmit link and the receive link are coupled to a transmission line by using the hybrid circuit. The echo cancellation apparatus includes a first signal converter, a slicer, a first subtractor, a second digital-to-analog converter, a second subtractor, and a third subtractor.
Claims20
A transceiver, comprising:
- an echo cancellation apparatus;
- a transmit link;
- a receive link;
- and
- a hybrid circuit, wherein:
- the hybrid circuit operably connects the transmit link and the receive link to a transmission line, and the echo cancellation apparatus includes:
- a first signal converter, configured to generate an echo reference signal based on a digital transmit signal on the transmit link;
- a slicer, configured to obtain a first cancellation reference signal whose amplitude is greater than a first threshold from the echo reference signal;
- a first subtractor, configured to subtract the first cancellation reference signal from the echo reference signal to obtain a second cancellation reference signal;
- a second digital-to-analog converter, configured to perform digital-to-analog conversion on the first cancellation reference signal to generate a first echo cancellation signal;
- a second subtractor, configured to subtract the first echo cancellation signal from an analog receive signal received by the receive link;
- and
- a third subtractor, configured to subtract the second cancellation reference signal from a digital receive signal on the receive link.
An echo cancellation method, comprising:
- generating, by an echo cancellation apparatus, an echo reference signal based on a digital transmit signal on a transmit link, wherein:
- the echo cancellation apparatus is included with a transceiver that further includes a hybrid circuit that operably connects the transmit link and a receive link to a transmission line;
- obtaining a first cancellation reference signal whose amplitude is greater than a first threshold from the echo reference signal;
- subtracting the first cancellation reference signal from the echo reference signal to obtain a second cancellation reference signal;
- performing digital-to-analog conversion on the first cancellation reference signal to generate a first echo cancellation signal;
- subtracting the first echo cancellation signal from an analog receive signal received by the receive link;
- and
- subtracting the second cancellation reference signal from a digital receive signal on the receive link.
A method, comprising:
- generating, by a first signal converter, an echo reference signal based on a digital transmit signal on a transmit link;
- obtaining, by a slicer, a first cancellation reference signal whose amplitude is greater than a first threshold from the echo reference signal;
- subtracting, by a first subtractor, the first cancellation reference signal from the echo reference signal to obtain a second cancellation reference signal;
- performing, by a digital-to-analog converter, digital-to-analog conversion on the first cancellation reference signal to generate a first echo cancellation signal;
- subtracting, by a second subtractor, the first echo cancellation signal from an analog receive signal received by a receive link;
- and
- subtracting, by a third subtractor, the second cancellation reference signal from a digital receive signal on the receive link.
Dependencies are inferred from the claim text.