Communication system capable of performing FDMA transmission

Details Communication system capable of performing FDMA transmission Communication system capable of performing FDMA transmission

1994-11-21

1998-02-03

Chin, Wellington

Multiplex communications

Generalized orthogonal or special mathematical techniques

Quadrature carriers

370203, 370344, 370480, 455 17, H04J 1100, H04B 7208

Patent

active

057152357

ABSTRACT:
A communication apparatus is disclosed which is capable of measuring levels of carrier signals used in adjacent zones during telecommunication with a small circuit scale, and capable of simultaneously transmitting/receiving to FDMA-system signals through a plurality of communication channels. All of transmission signals received through the communication channels under use are wholly converted into an intermediate signal by a mixer. The intermediate signal is quadrature-detected and then A/D-converted into digital I/Q-channel signals by A/D-converters. Thereafter, the digital I/Q-channel signals are frequency-converted by frequency converting circuits in such a manner that center frequencies of these I/Q-channel signals become zero, two sets of I/Q-channel signals may be demodulated by two sets of demodulating circuits. Otherwise, one of these I/Q-channel signals is demodulated by a single demodulating circuit, and the other is level-detected by a level detecting circuit.

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Bingham, John A.C., "Multicarrier Modulation for Data Transmission: An Idea Whose Time Has Come," IEEE Communications Magazine, vol. 28, No. 5, pp. 5-14, May 1990.
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