Telecommunications – Receiver or analog modulated signal frequency converter – Signal selection based on frequency
Patent
1997-03-27
1999-08-17
Eisenzopf, Reinhard J.
Telecommunications
Receiver or analog modulated signal frequency converter
Signal selection based on frequency
4551612, 4551803, 455324, H04B 116
Patent
active
059407476
ABSTRACT:
An apparatus and method performs a carrier signal acquisition operation in a receiver of a wireless portable unit. In order to locate and lock onto a carrier signal, a processor in the receiver is configured to sequentially examine each of a plurality of designated frequency bands within a predetermined frequency range, starting with the frequency band having the highest probability of containing the carrier signal. Through this acquisition operation, the carrier signal is easily located when outside of the normal search range of the processor. Since frequency errors due to, for example, the effects of variation and aging of hardware circuits are easily corrected, an inexpensive temperature compensated crystal oscillator may be employed in the receiver of the portable unit. In addition, since the processor is required to search only over a relatively narrow frequency band at any given point in time, a processor that requires a small number of instructions per second and minimal memory also may be employed in the receiver of the portable unit.
REFERENCES:
patent: 5301366 (1994-04-01), Groshong et al.
patent: 5450621 (1995-09-01), Kianush et al.
patent: 5457816 (1995-10-01), Koyama
patent: 5542095 (1996-07-01), Petranovich
patent: 5751772 (1998-05-01), Mannette et al.
Grohgans Matthew
Mohammed Jahangir
Eisenzopf Reinhard J.
Kincaid Lester G.
Lucent Technologies - Inc.
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