Quadrature-quadrature phase shift keying

Pulse or digital communications – Repeaters – Testing

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375 67, 375 86, 370 20, 332 23R, H04L 2710, H04J 1100, H03C 300

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active

046807772

ABSTRACT:
Methods for modulating and demodulating digital data streams utilize a quadrature-quadrature phase shift keying data transmission arrangement to achieve a 100% increase in the bandwidth efficiency over known systems, such as minimum shift keying. Known arrangements utilize two dimensional data transmission. However, Q.sup.2 PSK, in accordance with the invention, provides four dimensional transmission which doubles the rate of data transmission for a given bandwidth, at the expense of approximately 45% increase in the average energy per bit. The input data stream is demultiplexed to form four demultiplexed data streams which are formed of demultiplexed data bits. Each such data stream is combined with a signal having carrier and data pulse-shaping components. Additionally, the data pulse-shaping components have a quadrature phase relationship with each other, thereby adding the additional two dimensions of data transmission capacity.

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patent: 4406009 (1983-09-01), Lender
"Carriers", Data Communications Dictionary, Sippl, Van Nostrand Reinhold Company, 1976.

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