Symbol sampling time settlement of a hard decision radio receiver
AssigneeTelefonaktiebolaget LM Ericsson (publ)
InventorsJoakim Persson, Leif Wilhelmsson
Life of this patent
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Abstract
A method and apparatus for improving bit error performance within a hard decision radio interface processing environment is provided, whereby a sampling unit collects a number of samples per channel symbol of an input signal to generate a number of sampling streams, and a correlator computes a correlation value of each of the number of sampling streams with a predetermined bit sequence. The correlation values are fed into a threshold comparator which utilizes a variable threshold value to generate threshold comparator values or trigger output values. By examining a set of trigger output values, a phase decision unit determines the optimum sampling timing or sampling phase.
Claims26
A method for improving bit error performance within a hard decision radio interface processing environment, comprising the steps of:
- sampling a received signal including a plurality of channel symbols a predetermined number of times;
- generating a corresponding plurality of sampling sequences, each said sampling sequence representing a phase value;
- correlating each said sampling sequence with a reference sequence;
- generating a correlation value for each said sampling sequence;
- comparing each said respective correlation value with a threshold value;
- generating a plurality of binary trigger output values;
- generating a trigger output state from a grouped plurality of said plurality of binary trigger output values;
- and
- determining a sampling phase by comparing said trigger output state with predetermined decision rules.
An apparatus for improving bit error performance within a hard decision radio interface processing environment, comprising:
- means for sampling a received signal and generating a plurality of sampling sequences, each said sampling sequence representing a phase,
- a correlator coupled to said means for sampling, for correlating each said sampling sequence with a reference sequence and outputting a correlation value;
- a comparator coupled to said correlator, for comparing each said output correlation value with a threshold value and generating a binary trigger output value for each said correlation value;
- means for generating a trigger output state from a grouped plurality of said binary trigger output values;
- and
- a decision unit coupled to said comparator, for determining a sampling phase by comparing said trigger output state with predetermined decision rules.
Dependencies are inferred from the claim text.