System and method for optimizing walsh code assignments
View Patent ↗A wireless communication system is disclosed, including a network and a plurality of base stations coupled to the network, wherein each of the base stations are adapted to transmit only a Pilot channel information, one or more Paging channel information, and a Sync channel information using a first group of adjacent Walsh codes W i n to W i+j n , where i and j are integers, and n is the length of the Walsh codes. In the wireless communication system, the base station may be further adapted to transmit traffic channel information using a second group of adjacent Walsh codes W i+j+1 n to W n−1 n . Alternatively, the base station may be further adapted to transmit traffic channel information using a second group of adjacent Walsh codes W 0 n to W i−1 n . Alternatively, the base station may be further adapted to transmit traffic channel information using a second group of adjacent Walsh codes W int(j/2+1) n/2 to W n/2−1 n/2 or W 0 n/2 to W int(i/2−1) n/2 .
1. A wireless communication system, comprising:
a network; and
a plurality of base stations coupled to said network, wherein each of said base stations transmits only a Pilot channel information, one or more Paging channel information, and a Sync channel information using a first group of adjacent Walsh codes W i n to W i+j n , and each of said base stations transmits only traffic information using a second group of adjacent Walsh codes, where i and j are integers, n is the length of each of the Walsh codes and a sum of a number of Walsh codes in the first and second groups of adjacent Walsh codes is equal to n.
2. The wireless communication system of claim 1 , wherein said second group of adjacent Walsh codes is W i+j+1 n to W n−1 n .
3. The wireless communication system of claim 1 , wherein said second group of adjacent Walsh codes is W 0 n to W i−1 n .
4. The wireless communication system of claim 1 , wherein i is equal to zero.
5. The wireless communication system of claim 4 , wherein the Pilot channel information is transmitted using Walsh code W 0 n .
6. The wireless communication system of claim 1 , wherein the Sync channel information is transmitted using Walsh code W i+j n .
7. The wireless communication system of claim 1 , wherein the one or more Paging channels are transmitted using one or more Walsh codes W i+1 n to W i+j−1 n .
8. A base station, comprising:
an RF interface;
an antenna; and
a processor to transmit only a Pilot channel information, one or more Paging channel information, and a Sync channel information using a first group of adjacent Walsh codes W i n to W i+j n , and to transmit only traffic information using a second group of adjacent Walsh codes, where i and j are integers, n is the length of the Walsh codes and a sum of a number of Walsh codes in the first and second groups of adjacent Walsh codes is equal to n.
9. The base station of claim 8 , wherein said second group of adjacent Walsh codes is W i+j+1 n to W n−1 n .
10. The base station of claim 8 , wherein said second group of adjacent Walsh codes is W 0 n to W i−1 n .
11. A method comprising:
transmitting only a Pilot channel information, one or more Paging channel information, and a Sync channel information using a first group of adjacent Walsh codes W i n to W i+j n ; and
transmitting only traffic channel information using a second group of adjacent Walsh codes,
where i and j are integers, n is the length of the Walsh codes and a sum of a number of Walsh codes in the first and second groups of adjacent Walsh codes is equal to n.
12. The method of claim 11 , wherein said second group of adjacent Walsh codes is W i+j+1 n to W n−1 n .
13. The method of claim 11 , wherein said second group of adjacent Walsh codes is W 0 n to W i−1 n .
14. A method comprising:
transmitting only a Pilot channel information, one or more Paging channel information, and a Sync channel information using a first group of adjacent Walsh codes W i n to W i+j n ; and
transmitting only traffic channel information using a second group of adjacent Walsh codes,
where i and j are integers, n is the length of the Walsh codes, wherein said second group of adjacent Walsh codes is one of W int(j/2+1) n/2 to W n/2−1 n/2 or W 0 n/2 to W int(i/2−1) n/2 .
15. A computer readable medium including one or more software modules to control a processor to:
transmit only a Pilot channel information, one or more Paging channel information, and a Sync channel information using a first group of adjacent Walsh codes W i n to W i+j n W i+j n ; and
transmit only traffic channel information using a second group of adjacent Walsh codes,
where i and j are integers, n is the length of the Walsh codes and a sum of a number of Walsh codes in the first and second groups of adjacent Walsh codes is equal to n.
16. The computer readable medium of claim 15 , wherein said second group of adjacent Walsh codes is W i+j+1 n to W n−1 n .
17. The computer readable medium of claim 15 , wherein said second group of adjacent Walsh codes is W 0 n to W i−1 n .
18. A base station, comprising:
an antenna;
an up converter including an output coupled to said antenna;
an I- and Q- modulator including an output coupled to said up converter;
a summer including an output coupled to said I- and Q- modulator;
a plurality of modulo-2 adders including respective inputs to receive Pilot channel information, one or more Paging channel information, and a Sync channel information, and other inputs to only receive Walsh codes in a manner that said Pilot channel information, one or more Paging channel information, and a Sync channel information are modulo-2 added respectively with a first group of adjacent Walsh codes W i n to W i+j n ; and
other modulo-2 adders that modulo-2 add only traffic channel information with a second group of adjacent Walsh codes,
where i and j are integers, n is the length of the Walsh codes and a sum of a number of Walsh codes in the first and second groups of adjacent Walsh codes is equal to n.
19. The base station of claim 18 , wherein said second group of adjacent Walsh codes is W i+j+1 n to W n−1 n .
20. The base station of claim 18 , wherein said second group of adjacent Walsh codes is W 0 n to W i−1 n .
21. A subscriber unit, comprising:
an RF interface;
an antenna; and
a processor to receive only a Pilot channel information, one or more Paging channel information, and a Sync channel information by way of said antenna and said RF interface using a first group of adjacent Walsh codes W i n to W i+j n and to receive only traffic channel information using a second group of adjacent Walsh codes, where i and j are integers, n is the length of the Walsh codes and a sum of a number of Walsh codes in the first and second groups of adjacent Walsh codes is equal to n.
22. The subscriber unit of claim 21 , wherein said second group of adjacent Walsh codes is W i+j+1 n to W n−1 n .
23. The subscriber unit of claim 21 , wherein said second group of adjacent Walsh codes is W 0 n to W i−1 n .
24. A method comprising:
receiving only a Pilot channel information, one or more Paging channel information, and a Sync channel information using a first group of adjacent Walsh codes W i n to W i+j n ; and
receiving only traffic channel information using a second group of adjacent Walsh codes, where i and j are integers, n is the length of the Walsh codes and a sum of a number of Walsh codes in the first and second groups of adjacent Walsh codes is equal to n.
25. The method of claim 24 , wherein said second group of adjacent Walsh codes is W i+j+1 n to W n−1 n .
26. The method of claim 24 , wherein said second group of adjacent Walsh codes is W 0 n to W i−1 n .
27. A computer readable medium including one or more software modules to control a processor to:
receive only a Pilot channel information, one or more Paging channel information, and a Sync channel information using a first group of adjacent Walsh codes W i n to W i+j n ; and
receive only traffic channel information using a second group of adjacent Walsh codes, where i and j are integers, n is the length of the Walsh codes, and a sum of a number of Walsh codes in the first and second groups of adjacent Walsh codes is equal to n.
28. The computer readable medium of claim 27 , wherein said second group of adjacent Walsh codes is W i+j+1 n to W n−1 n .
29. The computer readable medium of claim 27 , wherein said second group of adjacent Walsh codes is W 0 n to W i−1 n .