Patent ID: 6654405
Filing Date: 2003-11-25
Classification: H04B,H04J

Abstract:
A signal processing apparatus suitable for use in direct sequence spread spectrum communications, comprising:an analog receiver; a quadrature phase shift keying (QPSK) despreader, including: an input coupled to receive I and Q samples from the analog receiver; an output to provide I and Q pilot symbols; a Walsh uncover unit, including: an input coupled to receive and I and Q pilot symbols; an output to provide Walsh uncovered I and Q data symbols; a controller; a filter programmed in the controller to provide I and Q pilot symbol estimates based on the I and Q pilot symbols; a dot product hardware unit external from the controller having the programmed filter; and the dot product hardware unit including: a first input coupled to receive the I and Q pilot symbol estimates; a second input coupled to receive the I and Q data symbols; and an output to provide results of a dot product function between the I and Q pilot symbol estimates and the I and Q data symbols.