초록 ▼

A method and system are provided for the synchronous transmission and reception of multiplexed digital signals such as spread spectrum. The system uses biorthogonal modulation of a plurality of orthogonal signals, preferably wideband, together with simultaneous orthogonal multiplexing. The method is

A method and system are provided for the synchronous transmission and reception of multiplexed digital signals such as spread spectrum. The system uses biorthogonal modulation of a plurality of orthogonal signals, preferably wideband, together with simultaneous orthogonal multiplexing. The method is found to significantly mitigate the crosscorrelation interference that is caused by the interaction between the multiplexed signals. The system transmits a lesser number of multiplexed orthogonal signals than would be required in the corresponding antipodal system, thereby reducing the crosscorrelation interference, while maintaining the same information throughput. The bit error rate of the system is reduced. The method combines aspects of unequal error protection (UEP) error correction coding (ECC) with a receiver architecture for biorthogonal signals. The system exhibits a signal-to-noise ratio (SNR) improvement in the detection of some fraction of the encoded digital data bits. This facilitates the use of additional error control redundancy in the remaining data bits, which results in an overall improvement in the decoded error rate performance.

대표청구항 ▼

[ I claim:] [1.] A transmitter for simultaneously transmitting a plurality of orthogonal signals for reception by at least one receiver, the transmitter comprising:first and second biorthogonal modulators, each of said biorthogonal modulators including a multiplexor for outputting one of a possible

[ I claim:] [1.] A transmitter for simultaneously transmitting a plurality of orthogonal signals for reception by at least one receiver, the transmitter comprising:first and second biorthogonal modulators, each of said biorthogonal modulators including a multiplexor for outputting one of a possible plurality M of orthogonal signals at a particular polarity;means for forming a composite signal from the outputs of said first and second biorthogonal modulators so that a plurality of orthogonal biorthogonally modulated signals are simultaneously transmitted as the composite signal; andan unequal error protection encoder for error encoding selection bits with additional redundancy compared to polarity bits.