Orthogonal frequency division multiplexing with amplitude shift keying subcarrier modulation as a reliable and efficient transmission scheme for self-mixing receivers
A new receiving scheme for self-mixing receivers is presented that overcomes the disadvantages of the self-heterodyne concept. Generally speaking, the self-mixing receiver offers immunity to phase noise and frequency offsets, especially at very high frequencies, since it does not require radio f...
| Main Authors: | , , |
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| Format: | Article |
| Language: | deu |
| Published: |
Copernicus Publications
2017-09-01
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| Series: | Advances in Radio Science |
| Online Access: | https://www.adv-radio-sci.net/15/99/2017/ars-15-99-2017.pdf |
| Summary: | A new receiving scheme for self-mixing receivers is presented that overcomes
the disadvantages of the self-heterodyne concept. Generally speaking, the
self-mixing receiver offers immunity to phase noise and frequency offsets,
especially at very high frequencies, since it does not require radio
frequency local oscillators. Our proposed technique eliminates the drawbacks
of the self-heterodyne transmission scheme, which are the poor power
efficiency and the strong dependence on the continously transmitted carrier.
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A nonlinear system of equations is constructed that describes a phase
retrieval problem for the reconstruction of the original transmit signal
before self-mixing. Two different solution strategies, with restrictions in
time and frequency domain, are presented. As a consequence, the self-mixing
equation system is shown to be solvable with some a-priori information about
the transmit signal. With this novel approach, the transmitted information is
distributed over the full available bandwidth, and there is no special
dependence on a certain subcarrier for the down-conversion.
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The general performance, regarding bit error ratio over signal to noise
ratio, is improved by at least 2 dB as compared to the self-heterodyne
transmission scheme. In the case of frequency selective channels, e.g.
multi-path propagation, this improvement is shown to be much larger, because
the presented approach is able to reconstruct the received subcarriers
without the necessity of receiving all subcarriers. |
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| ISSN: | 1684-9965 1684-9973 |