Binary or quadriphase signal design for approximately synchronized CDMA systems without detection sidelobe nor co-channel interference

The author proposed a signal design method without co-channel interference for approximately synchronized CDMA systems. The author also proposed “coded addition of sequences” for realizing good information transmission rate in CDMA systems including approximately synchronized CDMA systems. The proposed signals also have the property of no detection sidelobe, when “the basic orthogonal sequences” are polyphase orthogonal sequences. This property is discussed in detail. From the view point of equipment, binary signals or quadriphase signals are more useful than polyphase signals. So, the author propose a signal design method of binary and quadriphase signals for approximately synchronized CDMA systems with good information transmission rate without detection sidelobe nor co-channel interference. In the proposed signal design theory, each pair of transmitter and receiver (in some case, base station) use binary or quadriphase sequences on their own carrier. Co-channel interference exists as polyphase sequences for the receiver´s carrier, so that co-channel interference has no influence on the detection in the receiver, although the co-channel interference signals are binary or quadriphase signals for their own transmitters´ carrier