Reducing peak-to-average variance of a composite transmitted signal via out-of-band artifact signaling

A transmitter for processing signals in a multiple mobile subscriber unit wireless communication system comprising:

• wideband digital combiner means, tier combining a plurality, n, of channel signals which are to be transmitted to a plurality of the mobile subscriber units, to produce a wideband composite digital signal, x(t), consisting of the n channel signals spaced apart in frequency, the wideband composite digital signal x(t) having an envelope that varies over time and a predetermined bandwidth;
• artifact signal generating means, connected to receive the wideband composite digital signal, for generating an out-of-band artifact digital signal, a(t), which offsets the amplitude variations of the wideband composite digital signal, the artifact digital signal having frequency components that fall in a bandwidth outside of the predetermined bandwidth of the wideband composite digital signal;
• summing means, connected to add the wideband composite digital signal x(t) and out-of-band artifact digital signal a(t), to produce a constant envelope digital signal, h(t);
• digital-to-analog (D/A) conversion means, connected to receive the constant envelope digital signal, h(t), and to provide a constant envelope analog signal;
• upconverter meters, connected to the D/A converter, for upconverting the constant envelope analog signal to a radio frequency (RF) to produce a constant envelope RF signal;
• a high power amplifier, connected to receive the constant envelope RF signal, and to provide a power amplified RF signal;
• RF filtering means, connected to receive the power amplified RF signal, for filtering components of the power amplified RF signal corresponding to the out-of-band artifact signal, to provide a wideband composite transmit signal;
• and
• an antenna, for receiving the wideband composite transmit signal from the filtering means, and for providing a wide band wireless composite signal to the plurality of mobile subscriber units.