Patent Document ID: 9509538
Application ID: 14816576
Patent Flag: 1

Claim One:
1. A digital communication receiver for detecting signals transmitted by a digital transmitter through a communication channel, the channel having a channel attenuation |h| and a channel phase shift having a multipath fading effect on the transmitted signals, the receiver comprising a demodulator configured to demodulate signals received by the receiver using channel coefficients representing the channel attenuation only without any knowledge of the channel phase shift, wherein: the demodulator is robust to phase noise, large phase variations and time-varying I-Q imbalance; the demodulator uses a M-ary amplitude shift keying technique, the transmitted signals being modulated by the transmitter using said same technique before transmission using a modulation order M equal or superior to 2; the detected signals have a symbol Error Rate (SER) intermediate in terms of performance between a coherent detection and a non-coherent detection assuming a same spectral efficiency; the demodulator is less complex than a coherent demodulator, and wherein the SER performance of the detected signals using the demodulator is substantially similar to a SER performance obtained using a coherent demodulator; the channel is a multi-path fading channel; and the received signals have an energy η and the channel attenuation coefficients have a magnitude |h| 2 , and wherein the demodulator is configured to equalize the energy of the received signals η using only the magnitude of the channel coefficients |h| 2 such that an equalized envelop of the received signals is obtained according to the following equation in which the multipath fading effect of the channel on the transmitted signals is converted into an additive disturbance: ζ = η  h  2 =  v  2  h  2 =  A i 2  + 1  h  2 ⁡ [ ( h * ⁢ A i * ⁢ w + h ⁢ ⁢ A i ⁢ w * ) +  w  2 ] where ζ is: the energy equalized signal where ν is: the received signal where A i 2 is: the energy of the transmitted symbol where w is: additive white Gaussian noise where (.)* denotes the complex conjugate.