US 7,680,084 B2 · Method and apparatus for providing orthogonal spot beams, sectors, and picocells

Abstract

A method and apparatus for providing orthogonal spot beams (14a, 14b), sectors (16a, 16b), and picocells (18), by using orthogonal auxiliary pilots and different Walsh traffic channels in adjacent areas. According to the IS-95 standard, the pilot signal is covered with the 64-chip Walsh sequence zero. Designating the 64-chip all zeros Walsh sequence as P and the 64-chip all one sequence as M, additional pilot signals are provided in the present invention by concatenating the P and the 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. In general, the 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.

Claims9

Dependent claims

A method of wireless communications, comprising:

providing pilot data;
covering said pilot data with a first Walsh sequence to generate a first pilot signal, wherein the first Walsh sequence comprises a first basic Walsh sequence concatenated with a complementary sequence of the first basic Walsh sequence;
and
covering said pilot data with a second Walsh sequence orthogonal to said first Walsh sequence to generate a second pilot signal, wherein the second Walsh sequence comprises a second basic Walsh sequence concatenated with a complementary sequence of the second basic Walsh sequence:
wherein the method is performed by a base station.

2 more elements

Dependencies are inferred from the claim text.

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

Life of this patent

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

Life of this patent

Abstract

Claims9