Spread-spectrum transceiver
View Patent ↗An assembly of simultaneously transmitted electrically generated signals, which contains a subset of binary spreading-code sequences that are members of a larger set of binary spreading-code sequences available to a particular node of a multi-node communication network. All sequences in the set of spreading-code sequences available to the particular node of the network can be generated by the same configuration of two linear-feedback binary shift registers, where feedback taps of the two linear-feedback binary shift registers correspond to primitive polynomials of the same degree over GF(2), the field of two elements.
1. A transmitting apparatus for communicating information in a multi-node communication network, comprising:
a spreading code sequence generator for generating spreading code sequences from a set of spreading code sequences, said set of spreading code sequences being selected from a plurality of subsets of the set of spreading code sequences associated with the transmitting apparatus and said spreading code sequences at least partially being generated by combining contents of specified stages of a first shift register with contents of specified stages of a second shift register; and
a transmitter for simultaneously transmitting first I and Q signals during a first time interval, and simultaneously transmitting second I and Q signals during a second time interval, said first I and Q signals each including an individual spreading code sequence of a first subset from said set of spreading code sequences and said second I and Q signals each including an individual spreading code sequence of a second subset from said set of spreading code sequences, wherein at least one of said first and second subsets from the set of spreading code sequences includes more than one spreading code sequence.
2. The apparatus of claim 1 , wherein the spreading code sequences comprise Gold codes.
3. The apparatus of claim 1 , wherein said first and second I and Q signals are each individually configured to carry data or control information.
4. The apparatus of claim 1 , wherein said first and second I and Q signals may each individually include one or more spreading code sequences.
5. The apparatus of claim 1 , wherein the spreading code sequences are selected from the set of spreading code sequences based upon a particular data rate.
6. The apparatus of claim 1 , further comprising:
a modulator for modulating the spreading code sequences of each of said first and second subsets onto corresponding carriers of the same frequency having different phases.
7. The apparatus of claim 6 , wherein the modulator uses phase shift keying (PSK).
8. The apparatus of claim 6 , wherein each of said first and second subsets includes two spreading code sequences, and said modulator modulates the two sequences of each of said first and second subsets onto two corresponding carriers of the same frequency.
9. The apparatus of claim 8 , wherein said two corresponding carriers are out of phase by 90 degrees.
10. A transmitting apparatus for communicating information in a multi-node communication network, comprising:
a sequence generator for generating a Gold code by combining contents of specified stages of a first shift register with contents of specified stages of a second shift register; and
a transmitter for simultaneously transmitting first I and Q signals during a first time interval, and simultaneously transmitting second I and Q signals during a second time interval, said first I and Q signals each including a first spreading code sequence, of a first subset from a set of spreading code sequences, which is derived from said Gold code and said second I and Q signals each including a second spreading code sequence, of a second subset from said set of spreading code sequences, which is derived from said Gold code and different from said first spreading code sequence;
wherein at least one of said first and second subsets from the set of spreading code sequences includes more than one spreading code sequence and said set of spreading code sequences being selected from a plurality of subsets of said set of spreading code sequences associated with said transmitting apparatus.
11. The apparatus of claim 10 , wherein said first and second I and Q signals are each individually configured to carry data or control information.
12. The apparatus of claim 10 , wherein said first and second I and Q signals may each individually include one or more spreading code sequences.
13. The apparatus of claim 10 , wherein the spreading code sequences are selected based upon a particular data rate.
14. The apparatus of claim 10 , further comprising:
a modulator for modulating the first and second spreading code sequences onto corresponding carriers of the same frequency having different phases.
15. The apparatus of claim 14 , wherein the modulator uses phase shift keying (PSK).
16. A transmitting apparatus for communicating information in a multi-node communication network, comprising:
a spreading code sequence generator for generating spreading code sequences from a set of spreading code sequences, said set of spreading code sequences being selected from a plurality of subsets of the set of spreading code sequences associated with the transmitting apparatus; and
a transmitter for simultaneously transmitting first signals during a first time interval, and simultaneously transmitting second signals during a second time interval, said first signals each having individual spreading code sequences of a first subset from said set of spreading code sequences and said second signals each having individual spreading code sequences of a second subset from said set of spreading code sequences, wherein at least one of said first and second subsets from the set of spreading code sequences includes more than one spreading code sequence.
17. The apparatus of claim 16 , wherein said first and second signals may each individually include one or more spreading code sequences.
18. The apparatus of claim 16 , wherein the spreading code sequences are selected from the set of spreading code sequences based upon a particular data rate.
19. The apparatus of claim 16 , further comprising:
a modulator for modulating the spreading code sequences of each of said first and second subsets onto corresponding carriers of the same frequency having different phases.
20. The apparatus of claim 19 , wherein the modulator uses phase shift keying (PSK).
21. The apparatus of claim 19 , wherein each of said first and second subsets includes two spreading code sequences, and said modulator modulates the two sequences of each of said first and second subsets onto two corresponding carriers of the same frequency.
22. The apparatus of claim 21 , wherein said two corresponding carriers are out of phase by 90 degrees.
23. A method for communicating information in a multi-node communication network, comprising:
generating spreading code sequences from a set of spreading code sequences, said set of spreading code sequences being selected from a plurality of subsets of the set of spreading code sequences and said spreading code sequences at least partially being generated by combining contents of specified stages of a first shift register with contents of specified stages of a second shift register; and
simultaneously transmitting first I and Q signals during a first time interval, and simultaneously transmitting second I and Q signals during a second time interval, said first I and Q signals each including an individual spreading code sequence of a first subset from said set of spreading code sequences and said second I and Q signals each including an individual spreading code sequence of a second subset from said set of spreading code sequences, wherein at least one of said first and second subsets from the set of spreading code sequences includes more than one spreading code sequence.
24. The method of claim 23 , wherein the spreading code sequences comprise Gold codes.
25. The method of claim 23 , wherein said first and second I and Q signals are each individually configured to carry data or control information.
26. The method of claim 23 , wherein said first and second I and Q signals may each individually include one or more spreading code sequences.
27. The method of claim 23 , wherein the spreading code sequences are selected from the set of spreading code sequences based upon a particular data rate.
28. The method of claim 23 , further comprising:
modulating the spreading code sequences of each of said first and second subsets onto corresponding carriers of the same frequency having different phases.
29. The method of claim 28 , wherein said modulating includes phase shift keying (PSK).
30. The method of claim 28 , wherein each of said first and second subsets includes two spreading code sequences, and the two sequences of each of said first and second subsets is modulated onto two corresponding carriers of the same frequency.
31. The method of claim 30 , wherein said two corresponding carriers are out of phase by 90 degrees.
32. A method for communicating information in a multi-node communication network, comprising:
generating a Gold code by combining contents of specified stages of a first shift register with contents of specified stages of a second shift register; and
simultaneously transmitting first I and Q signals during a first time interval, and simultaneously transmitting second I and Q signals during a second time interval, said first I and Q signals each including a first spreading code sequence, of a first subset from a set of spreading code sequences, which is derived from said Gold code and said second I and Q signals each including a second spreading code sequence, of a second subset from said set of spreading code sequences, which is derived from said Gold code and different from said first spreading code sequence;
wherein at least one of said first and second subsets from the set of spreading code sequences includes more than one spreading code sequence and said set of spreading code sequences being selected from a plurality of subsets of said set of spreading code sequences.
33. The method of claim 32 , wherein said first and second I and Q signals are each individually configured to carry data or control information.
34. The method of claim 32 , wherein said first and second I and Q signals may each individually include one or more spreading code sequences.
35. The method of claim 32 , wherein the spreading code sequences are selected based upon a particular data rate.
36. The method of claim 32 , further comprising:
modulating the first and second spreading code sequences onto corresponding carriers of the same frequency having different phases.
37. The method of claim 36 , wherein said modulating includes phase shift keying.
38. A method for communicating information in a multi-node communication network, comprising:
generating spreading code sequences from a set of spreading code sequences, said set of spreading code sequences being selected from a plurality of subsets of the set of spreading code sequences; and
simultaneously transmitting first signals during a first time interval, and simultaneously transmitting second signals during a second time interval, said first signals each having individual spreading code sequences of a first subset from said set of spreading code sequences and said second signals each having individual spreading code sequences of a second subset from said set of spreading code sequences, wherein at least one of said first and second subsets from the set of spreading code sequences includes more than one spreading code sequence.
39. The method of claim 38 , wherein said first and second signals may each individually include one or more spreading code sequences.
40. The method of claim 38 , wherein the spreading code sequences are selected from the set of spreading code sequences based upon a particular data rate.
41. The method of claim 38 , further comprising:
modulating the spreading code sequences of each of said first and second subsets onto corresponding carriers of the same frequency having different phases.
42. The method of claim 41 , wherein said modulating includes phase shift keying.
43. The method of claim 38 , wherein each of said first and second subsets includes two spreading code sequences, and said two sequences of each of said first and second subsets is modulated onto two corresponding carriers of the same frequency.
44. The method of claim 43 , wherein said two corresponding carriers are out of phase by 90 degrees.