Patent ID: 8582693

Claim:
A wireless receiver for receiving a plurality of co-existing wireless signals from different positioning systems, comprising: an analog frontend, for converting bands of the plurality of co-existing wireless signals into a plurality of corresponding intermediate bands by a local frequency, and providing an intermediate signal comprising the plurality of intermediate bands; an analog-to-digital converting unit, coupled to the analog frontend, for converting the intermediate signal to a digital signal, wherein an operation band of the analog-to-digital converting unit covers the plurality of intermediate bands; a mixing portion for retrieving a plurality of baseband signals corresponding to the plurality of positioning systems in response to the digital signal, wherein the baseband signals comprise a plurality of I-branch baseband signals and a plurality of Q-branch baseband signals; and a processing portion arranged to map a first one of the I-branch baseband signals and a first one of the Q-branch baseband signals respectively to a real portion and an imaginary portion of a first constellation, and to map a second one of the I-branch baseband signals and a second one of the Q-branch baseband signals respectively to a real portion and a negative imaginary portion of a second constellation.