Method and apparatus for providing orthogonal spot beams, sectors, and picocells

(12) United States Patent

Lundby et al.

US006285655B1

(io) Patent No.: US 6,285,655 Bl (45) Date of Patent: Sep. 4,2001

(54) METHOD AND APPARATUS FOR

PROVIDING ORTHOGONAL SPOT BEAMS,
SECTORS, AND PICOCELLS

(75) Inventors: Stein A. Lundby, San Diego; Joseph P.

Odenwalder, Del Mar; Edward G.
Tiedemann, Jr., San Diego, all of CA
(US)

(73) Assignee: Qualcomm Inc., San Diego, CA (US)

( * ) Notice: Subject to any disclaimer, the term of this patent is extended or adjusted under 35 U.S.C. 154(b) by 0 days.

(21) Appl. No.: 08/925,521

(22) Filed: Sep. 8, 1997

(51) Int. CI.7 H04J 11/00; H04B 7/216;

H04L 27/30

(52) U.S. CI 370/209; 370/335; 370/342;

375/130; 375/134

(58) Field of Search 375/200, 206,

375/207, 208, 209, 210, 130, 133, 134, 137, 135, 136, 140, 142, 144, 145, 146, 147, 150, 149; 370/335, 331, 342, 206, 207, 208, 209; 455/436

(56) References Cited

U.S. PATENT DOCUMENTS

5,103,459 4/1992 Gilhousen et al 375/1

5,490,165 * 2/1996 Blakney, II et al 375/208

5,506,865 * 4/1996 Weaver, Jr 370/335

5,528,624 * 6/1996 Kaku 370/342

5,550,811 * 8/1996 Kaku 370/342

5,577,022 * 11/1996 Pavodani 375/208

5,577,025 11/1996 Skinner et al 370/22

5,712,869 * 1/1998 Lee et al 375/206

5,737,327 * 4/1998 Ling et al 370/335

5,870,378 * 2/1999 Huang et al 370/209

5,886,987 * 3/1999 Yoshida et al 370/335

5,909,434 * 6/1999 Odenwalder 370/342

A method and apparatus for providing orthogonal spot beams, sectors, and picocells. The transmissions can be made orthogonally by using orthogonal auxiliary pilots and different Walsh traffic channels in adjacent areas. In accordance with the IS-95 standard, the pilot signal is covered with the 64-chip Walsh sequence zero. The 64-chip all zeros Walsh sequence can be designated as P and the 64-chip all one sequence can be designated as M. In the present invention, additional pilot signals can be provided by concatenating 64-chip all zeros P and all ones M sequences. Thus, for two pilot signals, pilot Walsh sequences of PP and PM can be used. For four pilot signals, pilot Walsh sequences of PPPP, PMPM, PPMM, and PMMP can be used. The present invention can be extended such that any required number of pilot Walsh sequences can be generated by substituting each bit in an K-bit Walsh sequence with the 64-chip all zeros P or all ones M sequence depending on the value of that bit.

29 Claims, 6 Drawing Sheets