Function receiver for determining a function result of a plurality of function variable values from a plurality of function variable value transmitters (30 1... K), comprising: a receiver (34 1) for receiving, in a channel estimation phase, a first multiple-access channel signal corresponding, due to a sum characteristic of a wireless multiple-access channel, to a summation of constant power signals from the plurality of function variable value transmitters at the receiver, and, in a normal operating phase, a second multiple-access channel signal corresponding, due to a sum characteristic of a wireless multiple-access channel, to a summation of a plurality of sequences of symbols from the plurality of function variable value transmitters, wherein, for the plurality of function variable value transmitters, a symbols' phase varies differently and randomly, pseudo-randomly or deterministically with uniform distribution, and a symbols' magnitude is the same for the function variable value transmitters and depends on the respective function variable value of the respective function variable value transmitter, over the multiple-access channel at the receiver; a channel estimator for detecting a receive power of the first multiple-access channel signal during a time in which the constant power signals overlap to acquire a second order statistical moment describing the multiple-access channel; and a function result determiner for determining the function result based on a receive power of the second multiple-access channel signal and the second order statistical moment. a receiver (34 1) for receiving, in a channel estimation phase, a first multiple-access channel signal corresponding, due to a sum characteristic of a wireless multiple-access channel, to a summation of constant power signals from the plurality of function variable value transmitters at the receiver, and, in a normal operating phase, a second multiple-access channel signal corresponding, due to a sum characteristic of a wireless multiple-access channel, to a summation of a plurality of sequences of symbols from the plurality of function variable value transmitters, wherein, for the plurality of function variable value transmitters, a symbols' phase varies differently and randomly, pseudo-randomly or deterministically with uniform distribution, and a symbols' magnitude is the same for the function variable value transmitters and depends on the respective function variable value of the respective function variable value transmitter, over the multiple-access channel at the receiver; in a channel estimation phase, a first multiple-access channel signal corresponding, due to a sum characteristic of a wireless multiple-access channel, to a summation of constant power signals from the plurality of function variable value transmitters at the receiver, and, in a normal operating phase, a second multiple-access channel signal corresponding, due to a sum characteristic of a wireless multiple-access channel, to a summation of a plurality of sequences of symbols from the plurality of function variable value transmitters, wherein, for the plurality of function variable value transmitters, a symbols' phase varies differently and randomly, pseudo-randomly or deterministically with uniform distribution, and a symbols' magnitude is the same for the function variable value transmitters and depends on the respective function variable value of the respective function variable value transmitter, over the multiple-access channel at the receiver; a channel estimator for detecting a receive power of the first multiple-access channel signal during a time in which the constant power signals overlap to acquire a second order statistical moment describing the multiple-access channel; and a function result determiner for determining the function result based on a receive power of the second multiple-access channel signal and the second order statistical moment.