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US 11,637,684 B2Granted
Clock extraction in systems affected by strong intersymbol interference
AssigneeHuawei Technologies Co., Ltd.
InventorNebojsa Stojanovic
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Abstract
A timing recovery apparatus for signal reception in a data transmission system comprises an equalizer to equalize a received signal and a phase detector connected after the timing recovery equalizer that generates a clock tone from absolute values of the received signal after equalization.
Claims17
An apparatus, comprising:
- an equalizer comprising a main equalizer and a timing recovery (TR) equalizer, the main equalizer and TR equalizer being respectively switchable between a pulse amplitude modulation (PAM) mode and a duobinary pulse amplitude modulation (DB PAM) mode, the equalizer being configured to:
- equalize a received signal, to form an equalized signal;
- and
- output an equalized signal;
- and
- a phase detector, configured to:
- receive the equalized signal;
- and
- generate a clock tone from absolute values of the equalized signal, wherein the clock tone provides phase information for timing recovery.
6 more elements
A method, comprising:
- equalizing, by an equalizer, a received signal to form an equalized signal comprising at least one symbol;
- performing a single addition, a single subtraction, and a single multiplication, to produce a symbol output for each symbol of the equalized signal;
- and
- detecting a phase and generating a clock tone, by a phase detector, using absolute values of the equalized signal.
1 more element
Dependencies are inferred from the claim text.