Patent ID: 6324159
Filing Date: 2001-11-27
Classification: H04B,H04J

Abstract:
A method to generate a waveform with a plurality of orthogonal PN codes, to modulate a plurality of data streams, together with a non-orthogonal PN-code, having good auto-correlation properties, comprising the steps of:Taking a plurality of orthogonal codes that are used to spread a plurality of data streams;combining each of said spread data streams with in-phase BPSK modulations, and performing an addition, after optional gain control of each spread stream to obtain first signals;Defining a PN-code with good auto-correlation properties, and combining said code with BPSK modulation, which is orthogonal (90 degrees out-of-phase) with said BPSK modulations to obtain second signals;Combining said first and second signals as a complex signal with time-aligned PN-codes.