Title:
METHOD AND APPARATUS FOR INCREASING RECEIVER IMMUNITY TO INTERFERENCE
Document Type and Number:
WIPO Patent Application WO1996019048
Kind Code:
A3
Abstract:
The method and apparatus of the present invention improve the immunity to interference of a radio receiver. The power level of a received signal is detected. If the power level meets or exceeds a predetermined power threshold, the low noise amplifier (703) is by-passed (730), thus increasing the intercept point of the receiver components. Alternative embodiments include the use of an RF power detector (105) to control the front-end gain (110) as a function of jammer power. In lieu of a switchable RF gain block (730), several methods of continuous gain control are proposed. Continuous gain control allows the interference suppression and sensitivity of the receiver to be adjusted at lower signal levels than the switchable gain block. A method of the present invention adjusts the input gain by a predetermined amount (1601). The receiver processing measures the gain change in the IF signal power (1605). If the change is less than the predetermined amount (1610), the CDMA signal and jammers are below the noise floor and, therefore, the gain is increased (1615). If the IF signal power change is greater than the predetermined amount, the interference is evident and the gain is reduced to reduce the intermodulation products (1620). This process is used until the receiver is operating at the best compromise between interference and noise figure. 00000
Inventors:
WHEATLEY CHARLES E III
PETERZELL PAUL E
KORNFELD RICHARD K
WEILAND ANA L
PETERZELL PAUL E
KORNFELD RICHARD K
WEILAND ANA L
Application Number:
PCT/US1995/016002
Publication Date:
September 06, 1996
Filing Date:
December 11, 1995
Export Citation:
Assignee:
QUALCOMM INC (US)
International Classes:
H04B1/06; H03G1/00; H03G3/30; H04B1/10; H04B1/16; H04B1/18; H04B1/40; H04B1/7075; H04B1/7097; H04B3/06; H04B7/005; H04B7/26; H04B15/00; H04B; (IPC1-7): H04B7/005
Domestic Patent References:
| WO1991007037A1 | 1991-05-16 |
Foreign References:
| EP0342671A2 | 1989-11-23 | |||
| EP0622907A2 | 1994-11-02 | |||
| US5093840A | 1992-03-03 |
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