To provide a method and apparatus for increasing the interference immunity of a receiver.
When a signal is received, its electric power level is detected. When the level is equal to or greater than a prescribed power threshold value, a bypass path provided for the low-noise amplifier 115 increases the intercept point of receiver components. An alternative embodiment uses an RF power detector 105 to control the front-end gain as a function of the interfering power. It is possible to suppress the interference and control the receiver sensitivity to a low signal level by continuously controlling the gain. The processing unit of the receiver measures the gain change of the IF signal power. If the gain change is smaller than the prescribed value, the processing unit increases the gain since the CDMA signal and interfering power are below the lowest noise value. When the IF signal power change is greater than a prescribed value, an interference apparently exists. The processing unit reduces the gain and makes the intermodulation product smaller. This continues until the receiver operates at the best compromise of interference and a noise index.
| JP2009033671 | PROGRAM INFORMATION PROVIDING DEVICE |
PETERZELL PAUL E
KORNFELD RICHARD K
WEILAND ANA L
| JPH05335855A | 1993-12-17 | |||
| JPS63502473A | 1988-09-14 | |||
| JPS5710147U | 1982-01-19 |
Kurata Masatoshi
Satoshi Kono
Makoto Nakamura
Yoshihiro Fukuhara
Takashi Mine
Toshio Shirane
Sadao Muramatsu
Nobuhisa Nogawa
Kocho Chojiro
Naoki Kono
Katsu Sunagawa
Tetsuya Kazama
Katsumura Hiro
Shoji Kawai
Tatsushi Sato
Takashi Okada
Mihoko Horiuchi
Takenori Masanori
Takuzo Ichihara
Yamashita Gen
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