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Abstract

A system using a transmitter which comprises means of generating 4 extended sequences E.sub.A0, E.sub.A1, E.sub.B0 and E.sub.B1 using a set (A.sub.0,A.sub.1) of auto-complementary sequences with length L chips consisting of complete complementary sequences and another similar set (B.sub.0,B.sub.1), and means of generating a transmitting frame s.sub.P obtained by multiplying a cascaded sequence .sub.A made of extended sequences E.sub.A0 and E.sub.A1 by a pilot information {circumflex over (p)}, generating a transmitting frame s.sub.D obtained by multiplying a cascaded sequence .sub.B made of extended sequences E.sub.B0 and E.sub.B1 by data b, synchronously adding both the transmitting frames to produce a symbol frame, and transmitting a carrier wave modulated thereby, and a receiver which comprises means of applying a front portion r.sub.0 of the synchronously received baseband frame demodulated by above described carrier wave to matched filters M(A.sub.0) and M(B.sub.0), and applying a rear portion r.sub.1 of the synchronously received frame to matched filters M(A.sub.1) and M(B.sub.1), and means of generating a pilot-response-matrix {p} and a received data-response-matrix .PHI., both made of the outputs of M(A.sub.0) and M(A.sub.1), and of the outputs of M(B.sub.0) and M(B.sub.1) respectively, and generating an estimate {tilde over (b)} of transmitted data.

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First Claim