United States Patent 7,929,498
Ozluturk , et al. April 19, 2011
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Adaptive forward power control and adaptive reverse power control for spread-spectrum communications
Abstract
A wireless code division multiple access (CDMA) communication system, including a base station (BS) and a subscriber unit (SU), uses adaptive forward power control (AFPC) and adaptive reverse power control (ARPC) to control the transmit power of forward and reverse link radio frequency (RF) channel signals, respectively. Automatic gain control (AGC) signals are produced to maintain the level of forward and reverse CDMA signals at a near constant level. The CDMA signals are despread to produce first and second despread signals. The first and second despread signals are used to produce a first error signal e.sub.1. A second error signal e.sub.2 is produced based on the AGC signals. Combined error signals are formed based on the first error signal e.sub.1 and the second error signal e.sub.2. The combined error signals are hard limited to form adaptive power control (APC) bits used to control the level of the forward and reverse link RF channel signals.
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Inventors: Ozluturk; Fatih M. (Port Washington, NY), Lomp; Gary R. (Centerport, NY), Kowalski; John (Vancouver, WA)
Assignee: InterDigital Technology Corporation (Wilmington, DE)
Appl. No.: 09/789,389
Filed: February 21, 2001
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Related U.S. Patent Documents
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Application Number Filing Date Patent Number Issue Date
08956740 Apr., 2001 6215778
08669775 Aug., 1998 5799010
60000775 Jun., 1995
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Current U.S. Class: 370/335 ; 370/317; 370/332; 370/455; 370/522
Current International Class: H04B 7/216 (20060101)
Field of Search: 370/318,317,455,522,355,332-335
PPP
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