PULSE POSITION MODULATION COMMUNICATION SYSTEM

A pulse position modulation communication system which elminates the need for generating independent synchronizing pulses at transmitter facility. Numerical data is generated sequentially and is temporarily stored. The next occurring data is summed with the previously stored data, and the sum is transmitted in a position within a time frame representative of the numerical value. Simultaneously therewith this resultant sum replaces the previously stored data for summation with the next received data. Addition is performed by a modulo-M summing operation (i.e., ignoring any carry) where the value of M is the same as the number of time slots in each time frame. Subtraction of received pulse position data is performed in a similar manner at the receiver to restore the data to its original form.