公开(公告)号：US5790587A

公开(公告)日：1998-08-04

申请号：US483514

申请日：1995-06-07

Applicant: Douglas G. Smith ,  Robert C. Dixon ,  Jeffrey S. Vanderpool

Inventor： Douglas G. Smith ,  Robert C. Dixon ,  Jeffrey S. Vanderpool

IPC: G10L19/00 ,  H04B1/40 ,  H04B1/69 ,  H04B1/707 ,  H04B7/005 ,  H04B7/26 ,  H04J11/00 ,  H04J13/02 ,  H04L1/00 ,  H04L12/56 ,  H04L27/12 ,  H04W36/18 ,  H04W52/00 ,  H04W52/04 ,  H04W52/08 ,  H04W52/36 ,  H04W52/40 ,  H04W88/06 ,  H04K1/00 ,  H04L27/26

CPC classification number: H04B7/2634 ,  G10L19/012 ,  H04B1/005 ,  H04B1/0057 ,  H04B1/006 ,  H04B1/406 ,  H04B1/69 ,  H04B1/707 ,  H04B7/2618 ,  H04J13/00 ,  H04L27/12 ,  H04W52/04 ,  H04W52/08 ,  H04W52/362 ,  H04W52/367 ,  H04W52/40 ,  H04B2201/7071 ,  H04L1/0002 ,  H04W36/18 ,  H04W88/06

Abstract: A technique for spread-spectrum communication which uses more than one mode and more than one frequency band. Selectable modes include narrowband mode and spread-spectrum mode, or cellular mode and microcellular mode. Selectable frequency bands include both licensed and unlicensed frequency bands, particularly frequency bands including the 902-928 MHz, 1850-1990 MHz, and 2.4-2.4835 GHz frequency bands. Spread-spectrum communication channels are 10 MHz or less in width. The frequency band onto which spread-spectrum signals are encoded may be changed upon a change in environment or other control trigger, such as establishment or de-establishment of communication with a private access network. A multi-band transmitter comprises a single frequency synthesizer and a frequency source (e.g., a local oscillator), coupled to a selectable band pass filter. A multi-band receiver capable of monitoring one or more frequency bands comprises bank of bandpass filters and a demodulator comprising a single frequency synthesizer and a frequency source.

公开(公告)号：US5742595A

公开(公告)日：1998-04-21

申请号：US558675

申请日：1995-11-16

Applicant: Shashikant Bhagalia

Inventor： Shashikant Bhagalia

IPC: G06F9/46 ,  H04B1/707 ,  H04B7/005 ,  H04B7/24 ,  H04J3/06 ,  H04J11/00 ,  H04J13/00 ,  H04L9/32 ,  H04L12/24 ,  H04L12/26 ,  H04L12/28 ,  H04L12/403 ,  H04L12/56 ,  H04L12/66 ,  H04L29/06 ,  H04Q11/04 ,  H04W8/20 ,  H04W12/06 ,  H04W52/00 ,  H04W52/04 ,  H04W52/08 ,  H04W52/52 ,  H04W84/14 ,  H04W88/02 ,  H04W92/08 ,  H04K1/00

CPC classification number: H04Q11/04 ,  G06F9/546 ,  H04B1/707 ,  H04B1/7075 ,  H04B1/7077 ,  H04B1/7085 ,  H04J13/00 ,  H04J3/0682 ,  H04L12/26 ,  H04L12/66 ,  H04L29/06 ,  H04L41/0226 ,  H04L41/0233 ,  H04L41/22 ,  H04L43/00 ,  H04L69/14 ,  H04W52/04 ,  H04W52/52 ,  H04B1/70735 ,  H04B1/70775 ,  H04B2001/70706 ,  H04B2201/70702 ,  H04B2201/70706 ,  H04B2201/7071 ,  H04B2201/70711 ,  H04B2201/709709 ,  H04L41/08 ,  H04L69/08 ,  H04Q2213/1305 ,  H04Q2213/13093 ,  H04Q2213/13098 ,  H04Q2213/13109 ,  H04Q2213/1319 ,  H04Q2213/13196 ,  H04Q2213/13199 ,  H04Q2213/13202 ,  H04Q2213/13204 ,  H04Q2213/13216 ,  H04Q2213/13292 ,  H04Q2213/13296 ,  H04Q2213/13298 ,  H04Q2213/13299 ,  H04Q2213/13335 ,  H04Q2213/13376 ,  H04W52/08 ,  H04W8/205 ,  H04W84/14 ,  H04W88/021 ,  H04W92/08

Abstract: A CDMA signal processing circuit (300) includes a summer circuit (302) that receives a plurality of CDMA signals from a plurality of channels (304). The summer circuit (302) combines the plurality of CDMA signals according to a power magnitude value and power direction value associated with each CDMA signal. The summer circuit (302) generates a summed signal (306) that is applied to a clipping circuit (308). The clipping circuit (308) removes a portion of the summed signal (306) outside a desired threshold range and generates a clipped signal (310) therefrom. Digital to analog processing circuits (312 and 314) convert the clipped signal (310) into a half width encoded format. Digital to analog processing circuits (312 and 314) transform the half width encoded clipped signal into analog I and Q signals, respectively. The analog I and Q signals are applied to corresponding filters (316 and 318) prior to transmission.