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US 8,477,829 B2Granted
Differential detection a communication system
AssigneeAtmel Corporation
InventorsFrank Poegel, Tilo Ferchland, Thomas Hanusch
Life of this patent
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Abstract
In one embodiment, a detection unit includes a sequence providing unit to provide a third group of derived sequences. The third group for each first pseudo noise (PN) sequence has a derived sequence assigned to the first PN sequence. The detection unit includes a correlation unit, which is connected to the sequence providing unit and formed to calculate correlation results by correlating the differentially demodulated signal with each derived sequence of the third group. The detection unit includes an evaluation unit, which is connected to the correlation unit and is formed to derive the values of the data symbols by evaluating the correlation results.
Claims23
A detection unit, comprising:
- a sequence providing unit operable, based on a differentially demodulated signal comprising data symbols each assigned a pseudo-noise (PN) sequence from a sequence set, the sequence set having a first group of first PN sequences and a second group of second PN sequences, the first and second PN sequences within their respective group differing from one another by a cyclic shift in chip values, the second group for each first PN sequence having a corresponding second PN sequence differing from the first PN sequence by an inversion of each second chip value, to provide a third group of derived sequences, the third group for each first PN sequence having a derived sequence assigned to the first PN sequence and adapted to be derived therefrom, the derived sequences of the third group differing from one another by a cyclic shift in their chip values;
- a correlation unit operable to calculate correlation results by correlating the differentially demodulated signal with each derived sequence of the third group;
- and
- an evaluation unit operable to derive the values of the data symbols by evaluating the correlation results.
1 more element
A transmitting/receiving device, comprising:
- an antenna;
- a transmitter unit connected to the antenna and operable to transmit data and to assign to each data symbol a pseudo-noise (PN) sequence from a sequence set, which has a first group of first PN sequences and a second group of second PN sequences, the first and second PN sequences within their respective group differing from one another by a cyclic shift in their chip values, the second group having for each first PN sequence a corresponding second PN sequence, which differs from the first PN sequence by an inversion of every second chip value;
- a receiving unit connected to the antenna and operable to:
- provide, based on a differentially demodulated signal comprising data symbols each assigned a PN sequence from a sequence set, the sequence set having a first group of first PN sequences and a second group of second PN sequences, the first and second PN sequences within their respective group differing from one another by a cyclic shift in chip values, the second group for each first PN sequence having a corresponding second PN sequence differing from the first PN sequence by an inversion of each second chip value, a third group of derived sequences, the third group for each first PN sequence having a derived sequence assigned to the first PN sequence and adapted to be derived therefrom, the derived sequences of the third group differing from one another by a cyclic shift in their chip values;
- calculate correlation results by correlating the differentially demodulated signal with each derived sequence of the third group;
- and
- derive the values of the data symbols by evaluating the correlation results;
- and
- a control unit connected to the transmitting unit and the receiving unit and operable to control the transmitting unit and the receiving unit.
6 more elements
A method, comprising:
- providing, based on a differentially demodulated signal comprising data symbols each assigned a pseudo-noise (PN) sequence from a sequence set, the sequence set having a first group of first PN sequences and a second group of second PN sequences, the first and second PN sequences within their respective group differing from one another by a cyclic shift in chip values, the second group for each first PN sequence having a corresponding second PN sequence differing from the first PN sequence by an inversion of each second chip value, a third group of derived sequences, the third group for each first PN sequence having a derived sequence assigned to the first PN sequence and adapted to be derived therefrom, the derived sequences of the third group differing from one another by a cyclic shift in their chip values;
- calculating correlation results by correlating the differentially demodulated signal with each derived sequence of the third group;
- and
- deriving the values of the data symbols by evaluating the correlation results.
1 more element
Dependencies are inferred from the claim text.