Non-coherent multi-symbol-delay differential detector
View Patent ↗An electronic receiver may generate a differential detection sequence based on a received symbol sequence and based on a m-symbol delayed version of the received symbol sequence, where m is an integer greater than 1. The particular differential detection sequence may be a result of an element-by-element multiplication of the particular received symbol sequence and the conjugate of an m-symbol delayed version of the particular received symbol sequence. The receiver may calculate differential decision metrics based on the differential detection sequence and based on a set of differential symbol sequences generated from the set of possible transmitted symbol sequences. The receiver may generate a decision as to which of a set of possible transmitted symbol sequences resulted in the received symbol sequence, where the decision is based on the differential decision metrics and the set of possible transmitted symbols sequences.
1. A system comprising:
an electronic receiver comprising:
differential detection circuitry operable to:
generate a differential detection sequence based on a received symbol sequence and based on an m-symbol delayed version of said received symbol sequence, where the value of m is an integer greater than 1; and
vary the value of m during operation of the electronic receiver;
decision metrics calculation circuitry operable to calculate differential decision metrics based on said differential detection sequence; and
sequence decision circuitry operable to generate a decision as to which of a set of possible transmitted symbol sequences resulted in said received symbol sequence, where said decision is based on said differential decision metrics.
2. The system of claim 1 , wherein said calculation of said differential detection sequence is based on an element-by-element multiplication of said received symbol sequence and the conjugate of said m-symbol delayed version of said received symbol sequence.
3. The system of claim 1 , wherein said calculation of said decision metrics is based on a set of differential symbol sequences generated from said set of possible transmitted symbol sequences.
4. The system of claim 3 , wherein a particular differential symbol sequence in said set of differential symbol sequences is based on a particular sequence of said set of possible transmitted symbol sequences and an m-symbol delayed version of said particular sequence of said set of possible transmitted symbol sequences.
5. The system of claim 4 , wherein said particular differential symbol sequence is a result of an element-by-element multiplication of said particular sequence of said set of possible transmitted symbol sequences and the conjugate of said m-symbol delayed version of said particular sequence of said set of possible transmitted symbol sequences.
6. The system of claim 3 , wherein said calculation of said decision metrics is based on a correlation of said differential detection sequence with each differential symbol sequence in said set of differential symbol sequences.
7. The system of claim 1 , wherein said differential detection circuitry is operable to vary the value of m, during operation of said electronic receiver, based on a mode of operation of said electronic receiver.
8. The system of claim 1 , wherein said differential detection circuitry is operable to vary the value of m, during operation of said electronic receiver, based on a transmitter from which communications are to be received by said electronic receiver.
9. A method comprising:
in an electronic receiver:
generating, via differential detection circuitry of said receiver, a differential detection sequence based on a received symbol sequence and based on an m-symbol delayed version of said received symbol sequence, where m the value of is an integer greater than 1;
varying, during operation of the electronic receiver, the value of m;
calculating, via decision metrics calculation circuit, differential decision metrics based on said differential detection sequence; and
generating, via sequence decision circuitry of said receiver, a decision as to which of a set of possible transmitted symbol sequences resulted in said received symbol sequence, where said decision is based on said differential decision metrics.
10. The method of claim 9 , wherein said calculating said differential detection sequence is based on an element-by-element multiplication of said received symbol sequence and the conjugate of said m-symbol delayed version of said received symbol sequence.
11. The method of claim 9 , wherein said calculating said decision metrics is based on a set of differential symbol sequences generated from said set of possible transmitted symbol sequences.
12. The method of claim 11 , wherein a particular differential symbol sequence in said set of differential symbol sequences is based on a particular sequence of said set of possible transmitted symbol sequences and an m-symbol delayed version of said particular sequence of said set of possible transmitted symbol sequences.
13. The method of claim 12 , wherein said particular differential symbol sequence is a result of an element-by-element multiplication of said particular sequence of said set of possible transmitted symbol sequences and the conjugate of said m-symbol delayed version of said particular sequence of said set of possible transmitted symbol sequences.
14. The method of claim 11 , wherein said calculating said decision metrics comprises correlating said differential detection sequence with each differential symbol sequence in said set of differential symbol sequences.
15. The method of claim 9 , comprising varying, during operation of the electronic receiver, the value of m based on a mode of operation of said electronic receiver.
16. The method of claim 9 , comprising varying, during operation of the electronic receiver, the value of m based on a transmitter from which communications are to be received by said electronic receiver.