Gaire Laboratory - Orthogonal Coded Modulation

Orthogonal coded modulation for wireless communication applications

OptoRadio: a method of wireless communication using orthogonal M-ary PSK (OMPSK) modulations:

OptoRadio is a laser-based radio communication system using Orthogonal M-ary PSK Modulation. In this scheme, when a block of data needs to be transmitted, the corresponding block of the biorthogonal code is transmitted by means of multi-phase shift keying. At the receiver, two photodiodes are cross-coupled. The effect is that the net output power due to ambient light is close to zero. The laser signal is then transmitted only into one of the receivers. With all other signals being canceled out, the laser signal is an overwhelmingly dominant signal. The general block diagram of OptoRadio is shown in the figure.

Sunil Kumar Gaire, Saleh Faruque, Md. Maruf Ahamed, "OptoRadio: a method of wireless communication using orthogonal M-ary PSK (OMPSK) modulation", SPIE Optical Engineering+ Applications, 99790D-99790D-9.

Multilevel Orthogonal Coded Modulation:

Orthogonal codes are widely used in CDMA communication. These codes can also be used as error control codes in noisy communication systems. For channel coding using orthogonal codes, these codes are used to encode the information signal. The encoded data are modulated using spectrally efficient modulation techniques. In order to improve the error correction capability and improve the spectral efficiency, the orthogonal codes can be used as multilevel encoding combined with multilevel modulation techniques. The resulting system is spectrally efficient as well as able to correct a large number of errors. The encoder of the MOCM system is shown in the figure.

Master's thesis topic: "Multilevel orthogonal coded modulations".
Sunil Kumar Gaire, Saleh Faruque, "Performance Analysis of Orthogonal Coded M-Ary QAM Modulation Technique" CISS 2017, Baltimore, Maryland.

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