Patent ID: 7298779

Claim:
A fast code acquisition method comprising the steps of: preparing a locally optimum rank (LOR) detector; determining test statistics of the LOR detector based on signed-rank statistics according to the following equations: T LOR ⁡ ( X I , X Q ) = 1 2 ⁢ ∑ i = 1 n ⁢ { d ⁡ ( Q i I ) + d ⁡ ( Q i Q ) } + 1 2 ⁢ ∑ i = 1 n ⁢ ∑ j ≠ 1 n ⁢ Z i I ⁢ Z j Q ⁢ { c ⁡ ( Q i I , Q j I ) + c ⁡ ( Q i Q , Q j Q ) } where c ( Q i I ,Q j I )= E H {g (| X I | [i] ) g|X I | [i] )}, d ( Q i I )= E H {h (| X i | [i] )}, and h ⁡ ( x ) = f w ″ ⁡ ( x ) f w ⁡ ( x ) ⁢ g ⁢ ( x ) = - f w ′ ⁡ ( x ) f w ⁡ ( x ) wherein X I , X Q are inphase and quadrature channel data, n is an integer, Z I =sgn(X I ), and Z Q =sgn(X I ), both are vectors of signs of the inphase and quadrature channel data, Q I , Q Q are magnitude rank vectors of the inphase and quadrature channel data, and f W (x) is the common probability density function, acquiring a code utilizing the test statistics of the LOR detector.