Method of transmitting and receiving QPSK digital signals

Details Method of transmitting and receiving QPSK digital signals Method of transmitting and receiving QPSK digital signals

2006-04-11

2006-04-11

Corrielus, Jean (Department: 2637)

Pulse or digital communications

Transmitters

Angle modulation

C375S308000

Reexamination Certificate

active

07027524

ABSTRACT:
A method of transmitting QPSK digital signals in which each 2-digit binary number, referred to as a symbol, is assigned a phase of a carrier, and symbols are added to enable error correction at the receiver. The error correction code is a product code. To obtain transparency to phase rotations, the I bits (I1, I3, etc.) and the Q bits (Q2, Q4, etc.) of a symbol to be transmitted are placed in different rows but in the same column, so that each row contains only one type of bit, I or Q. The error correction coding is effected: row by row (NC-KC), and by pairs of adjacent columns, and the code I (or Q) bits of two associated adjacent columns are deduced from the I (or Q) bits of the two columns.

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Sandeep Rajpal et al: “Product Coded Modulation” Proceedings of the Global Telecommunications Conference (Globecom), Nov. 29, 1993-Dec. 2, 1993, pp. 7-11, vol. 4, New York, USA.

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