公开(公告)号：JPH11298378A

公开(公告)日：1999-10-29

申请号：JP35547998

申请日：1998-12-15

Applicant: LUCENT TECHNOLOGIES INC

Inventor： KNISELY DOUGLAS ,  KUO WEN-YI ,  MEYERS MARTIN HOWARD ,  NANDA SANJIV

IPC: H04B1/04 ,  H04J11/00 ,  H04Q7/36 ,  H04B1/707

Abstract: PROBLEM TO BE SOLVED: To reduce a peak-to-average ratio and eventually to relieve output reduction of an amplifier by including an orthogonal modulator circuit and a phase rotation circuit connected to the orthogonal modulator circuit, making the phase rotation circuit rotate the phases of an in-phase signal and an orthogonal signal and generating the in-phase signal undergoing phase rotation and the orthogonal signal undergoing phase rotation. SOLUTION: In a CDMA base station, intentional phase rotation (θk ) is introduced between different Walsh channels about the radio user in a baseband signal. A baseband coding/modulating unit 30 offers in-phase and orthogonal phase signals, they are connected to corresponding multipliers 32 and 34 and the multipliers 32 and 34 are connected to a Walsh code for orthogonal modulation. The multipliers 32 and 34 are connected to multipliers 36 and 38 and multipliers 40 and 42 respectively. Outputs of the multipliers 36 and 38 and inverted outputs/outputs of the multipliers 40 and 42 are connected to adders 44 and 46.

公开(公告)号：BR9805262A

公开(公告)日：1999-12-28

申请号：BR9805262

申请日：1998-12-10

Applicant: LUCENT TECHNOLOGIES INC

Inventor： KNISELY DOUGLAS ,  MEYERS MARTIN HOWARD ,  KUO WEN-YI ,  NANDA SANJIV

IPC: H04B1/04 ,  H04J11/00 ,  H04Q7/36 ,  H04B1/707

Abstract: Apparatus for reducing power amplifier headroom in a wireless transmission system comprises an orthogonal modulation circuit (32,34) and a phase rotation circuit (70) 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 (SI,K) and a quadrature output (SQ,K). The phase rotation circuit (70) rotates the phase of the in-phase signal and the quadrature signal, producing a phase rotated in-phase signal and a phase rotated quadrature signal. Multiple Walsh code defined channels are associated with a particular wireless user.