Digital radio receiver

Details Digital radio receiver Digital radio receiver

1996-09-30

1997-12-30

Chin, Stephen

Pulse or digital communications

Receivers

Angle modulation

4552391, 455308, 375343, 330135, H03D 300, H03K 906

Patent

active

057039100

ABSTRACT:
The present receiver includes a radiofrequency part (RF) coupled to a limiting amplifier (SL) which is in turn coupled to a demodulation means (DM) which recovers a digital signal from a received signal obtained by modulating a carrier signal with this digital signal. The limiting amplifier (SL) has an input-output characteristic which is substantially linear for smaller input signals and which strives with a decreasing gain towards a limit value for larger input signals. Due to this input-output characteristic smaller received signals are treated linearly up to the demodulation means (DM). The latter can therefore for these signals compensate for a specific spectrum shaping of the digital signal performed before the actual modulation. In this way the receiver will perform in a nearly optimal way resulting in low bit error rates. For larger received signals the limiting amplifier (SL) is non-linear and such compensation is consequently without effect resulting for these signals in a performance degradation. The Latter however is acceptable because these signals are naturally demodulated with less errors.

REFERENCES:
patent: 4571548 (1986-02-01), Jordan
patent: 4792991 (1988-12-01), Eness
patent: 4960989 (1990-10-01), Liebenrood et al.
Gilbert et al., "Monolethic DC-to-120-Mtlz Log-Amp is Stable and Accurate", Analog Dialogue, vol. 23, No. 3, 1989, pp. 3-6.
"Noncoherent detection of n/4-QPSK systems in a CCI-AWGN combined interferenceenvironment": by Chia-Liang Liu et al., Pro. IEEE 40th Vehicular technology conference, San Francisco, CA May 1989, pp. 83-94.
"Digital Communications", B. Sklar, Prentice-Hall 1988, pp. 100-104.

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