Method and apparatus for creating non-interfering signals using non-orthogonal techniques
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United States of America Patent
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Apr 3, 2001
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app pub date -
Feb 23, 1999
filing date -
Feb 23, 1999
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Abstract
A method and apparatus for creating non-interfering signals to be simultaneously transmitted over a common frequency in a wireless communication systems, such as a CDMA system, without the use of orthogonal codes and/or orthogonal code generation techniques. The system provides a pseudorandom combiner that receives the information signal and a pseudorandom code sequence and combines the information signal with the pseudorandom code sequence to produce the first combined signal. A channel sequence combiner receives the first combined signal and a repetitive maximum length channel sequence and combines these signals to produce a second combined signal. A selector receives the first combined signal, the second combined signal and a repetitive strobe signal, and selects either the first combined signal or the second combined signal to produce a modulated signal based upon a value of the repetitive strobe signal. The channel sequence values are non-orthogonal repetitive series of N bits, and the strobe signal is N+1 bits.
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