previously using a control channel of 10 mbits s on a 300 mhz subcarrier and baseband channels of 2 mbits s having a code length of 127 bits a subcarrier at 650 mhz can be added carrying channels of 10 mbits s having a code length of 31 bits this would give 33 high speed channels and extend the total spectrum used to about 960 mhz when multiple subcarriers are arranged it is possible to have simultaneous connections from one terminal to a number of different terminals the number ranging up to the number of rf subcarriers so that a case here called multiple connections having multiple rf subcarriers is obtained of course this results in that more hardware is required as many u201c spreader modulator u201d in the transmitter 3 and u201c demodulator despreader u201d in the receiver 5 are needed as the number of allowed connections if their number is the same as the number of subcarriers they do not have to be tunable the control channel can still be implemented in the same way as above an example of a transmitter and a receiver allowing two simultaneous connections is illustrated by the block diagrams of fig6 a and 6 b as for the transmitter and receiver circuits described in conjunction with fig4 a 4 b and 5 a 5 b these block diagrams illustrate only the principle of operation of the respective circuits in fig6 a and 6 b the same reference numerals as in the previously described figures are used for denoting identical or corresponding elements in the transmitter circuit for two rf subchannels illustrated in fig6 a two different data signals are individually code spread by multiplying them with individual spreading codes in multiplication circuits 41 which each one receives.