An impulse UWB signal multi-antenna receiver with an RF front-end shared between the various antennas. The receiver includes a code multiplexing stage upstream of the RF front-end, and a code demultiplexing stage downstream of this front-end. The codes used for multiplexing and demultiplexing are orthogonal codes with timing a sub-multiple of the chip timing of the code used at transmission for modulation of the impulse UWB signal.