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A new receiving scheme for self-mixing receivers is presented that overcomes\udthe disadvantages of the self-heterodyne concept. Generally speaking, the\udself-mixing receiver offers immunity to phase noise and frequency offsets,\udespecially at very high frequencies, since it does not require radio\udfrequency local oscillators. Our proposed technique eliminates the drawbacks\udof the self-heterodyne transmission scheme, which are the poor power\udefficiency and the strong dependence on the continously transmitted carrier.\ud  \udA nonlinear system of equations is constructed that describes a phase\udretrieval problem for the reconstruction of the original transmit signal\udbefore self-mixing. Two different solution strategies, with restrictions in\udtime and frequency domain, are presented. As a consequence, the self-mixing\udequation system is shown to be solvable with some a-priori information about\udthe transmit signal. With this novel approach, the transmitted information is\uddistributed over the full available bandwidth, and there is no special\uddependence on a certain subcarrier for the down-conversion.\ud  \udThe general performance, regarding bit error ratio over signal to noise\udratio, is improved by at least 2 dB as compared to the self-heterodyne\udtransmission scheme. In the case of frequency selective channels, e.g.\udmulti-path propagation, this improvement is shown to be much larger, because\udthe presented approach is able to reconstruct the received subcarriers\udwithout the necessity of receiving all subcarriers

advances in radio science

Orthogonal frequency division multiplexing with amplitude shift keying subcarrier modulation as a reliable and efficient transmission scheme for self-mixing receivers