Patent ID: 8135089
Filing Date: 2012-03-13
Classification: H04L

Abstract:
1. A digital transmission apparatus having a base unit for receiving n-bit digital signals from a plurality of (N) remote units, synthesizing said digital signals, and transmitting the digital synthesized signals, wherein said base unit comprises: a plurality of (N) bit extending units each for extending the digital signal from each of said remote units from n bits to (n+log an adding unit for adding signals from said bit extending units; a gain arithmetic operating unit for executing an arithmetic operation of (2 a multiplying unit for multiplying said addition result by the gain coefficient obtained by said gain arithmetic operating unit; a bit contracting unit for discarding upper log2N bits excluding a sign bit with respect to data multiplied by said multiplying unit and returning the data to n bits; a D/A converting unit for converting a signal from said bit contracting unit from the digital signal into an analog signal; and a wireless unit for frequency converting the signal from said D/A converting unit and amplifying the frequency converted signal.