H - Electricity – 04 – B
Patent
H - Electricity
04
B
H04B 7/005 (2006.01) H04B 1/707 (2006.01) H04Q 7/22 (2006.01) H04J 11/00 (2006.01)
Patent
CA 2254483
An apparatus for reducing power amplifier headroom in a wireless transmission system comprises an orthogonal modulation circuit and a phase rotation circuit coupled to the orthogonal modulation circuit. The orthogonal modulation circuit utilizes a Walsh code for modulating an in-phase signal and a quadrature signal. The orthogonal modulation circuit has an in-phase output and a quadrature output. The phase rotation circuit rotates phase of the in-phase signal the quadrature signal, producing a phase rotated in-phase signal abd a phase rotated quadrature signal. Multiple Walsh code defined channels are associated with a particular wireless user.
Knisely Douglas N.
Kuo Wen-Yi
Meyers Martin Howard
Nanda Sanjiv
Kirby Eades Gale Baker
Lucent Technologies Inc.
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