Patent ID: 6434163
Filing Date: 2002-08-13
Classification: G06F,H04B

Abstract:
In a CDMA receiver, a transverse correlator for recovering an information signal from a received message signal x(n) correlated with a locally-generated pseudo-random sequence s(n), the correlation signal Rxs defined by R~xs&af;(n)=&Sum;k=0N-1&it;â€ƒ&it;x&it;(k)&it;s*&it;(n+k),where n is defined as the number of samples in the received message signal, k is a predetermined correlation length, and s*(.) denotes the complex conjugate of the sequence s(.), said correlator comprising a serial plurality of N stages, each stage includinga multiplier having as a first input the received message signal x(n) and as a second input a selected element s(k) from the sequence s(n) to generate a product output x(n)s(k); an adder arrangement having as a first input the product output from said multiplier and as a second input an intermediate result from a previous stage of said serial plurality of stages, for providing as an output a correlation sum for the current stage; and a memory unit for storing said correlation sum for said current stage and providing said sum as the intermediate result to an adder for the subsequent stage of said plurality of N stages, where the output from the Nth stage adder is defined as the correlation signal Rxs.