Subscriber unit in a wireless personal communication system

• US 5,781,538 A
• Filed: 06/07/1995
• Issued: 07/14/1998
• Est. Priority Date: 11/23/1994
• Status: Expired due to Term

• Current Assignee: Hughes Electronics Corporation (AT&T, Inc.)
• Original Assignee: Hughes Electronics Corporation (AT&T, Inc.)
• Inventors: Pant, Ranjan, Khan, Tayyab, Ganesan, Kalyan, Johnson, Harry, Liau, Victor, Coughlin, Desmond
• Primary Examiner(s): Hsu, Alpus H.
• Assistant Examiner(s): YAO, KWANG BIN
• Application Number:
  US08/482,273
• Time in Patent Office: 1,133 Days
• Field of Search: 370/313, 370/345, 370/314, 370/315, 370/316, 370/317, 370/321, 370/337, 370/328, 370/347, 370/329, 370/330, 370/332, 370/334, 370/338, 455/31.1, 455/33.1, 455/34.2, 455/130, 455/150.1, 455/188.1, 455/190.1, 455/192.1, 455/192.2, 455/196.1, 455/255, 455/258, 455/259, 455/313, 455/314 , 455/315, 455/318, 455/73, 455/84, 455/86, 455/575, 379/58, 379/59
• US Class Current: 370/310
• CPC Class Codes: H04B 7/06 at the transmitting station
• CPC Class Codes: H04B 7/0602 using antenna switching H04B7/0686 takes precedence; antenna beam directivity switching H01Q3/24
• CPC Class Codes: H04B 7/0817 with multiple receivers and antenna path selection
• CPC Class Codes: H04Q 2213/13003 Constructional details of switching devices
• CPC Class Codes: H04Q 2213/13031 Pulse code modulation, PCM
• CPC Class Codes: H04Q 2213/13034 A/D conversion, code compression/expansion
• CPC Class Codes: H04Q 2213/13072 Sequence circuits for call signaling, ACD systems
• CPC Class Codes: H04Q 2213/13098 Mobile subscriber
• CPC Class Codes: H04Q 2213/13103 Memory
• CPC Class Codes: H04Q 2213/13106 Microprocessor, CPU
• CPC Class Codes: H04Q 2213/13107 Control equipment for a part of the connection, distributed control, co-processing
• CPC Class Codes: H04Q 2213/13196 Connection circuit/link/trunk/junction, bridge, router, gateway
• CPC Class Codes: H04Q 2213/13204 Protocols
• CPC Class Codes: H04Q 2213/13209 ISDN
• CPC Class Codes: H04Q 2213/13213 Counting, timing circuits
• CPC Class Codes: H04Q 2213/13216 Code signals, frame structure
• CPC Class Codes: H04Q 2213/13292 Time division multiplexing, TDM
• CPC Class Codes: H04Q 2213/13298 Local loop systems, access network
• CPC Class Codes: H04Q 2213/13299 Bus
• CPC Class Codes: H04Q 2213/1332 Logic circuits
• CPC Class Codes: H04Q 2213/13335 : Simulation, emulation
• CPC Class Codes: H04Q 2213/13349 : Network management
• CPC Class Codes: H04Q 2213/1336 : Synchronisation
• CPC Class Codes: H04Q 2213/13396 : Signaling in general, in-band signalling
• CPC Class Codes: H04W 84/14 : WLL [Wireless Local Loop]; RLL [Radio Local Loop]

Abstract

The present invention relates to a subscriber unit in a wireless personal communications system (WPCS). In one embodiment, the subscriber unit includes a digital dataport for modemless communication of digital signals. Another preferred embodiment provides for a subscriber unit having a cable television transport module for modulating and demodulating signals over unused bandwidth available on cable television lines.

Claims

1. A subscriber unit for receiving and transmitting digital information in a wireless communication system, said subscriber unit comprising:

a plurality of antennas;

an RF receive section including a diversity selection unit for receiving input signals from each of the antennas;

an RF transmit section for generating an output signal to be transmitted over at least one of the antennas;

means for modemlessly coupling digital signals between a first external processing device, the RF receive section, and the RF transmit section such that the subscriber unit is adapted to communicate data between the first external processing device and a second external processing device;

a circuit for downconverting radio frequency signals, the circuit including (a) a first mixer connected to a first local oscillator for producing an adjustable first local oscillator frequency;

(b) a second mixer connected to a second local oscillator centered at a predetermined second local oscillator frequency; and

(c) a third mixer connected to a third local oscillator centered at a predetermined third local oscillator frequency; and

a databus interconnecting said RF receive section, said RF transmit section, and said modemless coupling means.

2. The subscriber unit of claim 1 further comprising:

an analog port adapted for connection to an analog telephone, said analog port being in communication with said databus.

3. The subscriber unit of claim 2, wherein said analog port includes a digital signal processor.

4. The subscriber unit of claim 1, wherein said plurality of antennas are positioned spatially and angularly diverse from each other.

5. The subscriber unit of claim 1, wherein said subscriber unit is a portable subscriber unit.

6. The subscriber unit of claim 5, wherein the portable subscriber unit comprises more than one receive chain, at least one of said receive chains assigned to search for frequencies having a predetermined signal-to noise ratio, and at least one of said receive chains communicating with a radio port thereby providing improved high mobility performance.

7. The subscriber unit of claim 1, wherein the first local oscillator frequency is adjustable in the range of approximately 2.125 to 2.205 Ghz.

8. The subscriber unit of claim 1, wherein the second local oscillator frequency is approximately 225.85 MHz.

9. The subscriber unit of claim 1, wherein the third local oscillator frequency is approximately 9.932 Mhz.

10. The subscriber unit of claim 1, wherein the modemless coupling means comprises a digital data port.

11. The subscriber unit of claim 10, wherein the digital dataport comprises an RS-232 port and a DUART.

12. A subscriber unit for receiving and transmitting digital information in a wireless communication system, said subscriber unit comprising:

a plurality of antennas;

an RF receive section including a diversity selection unit for receiving input signals from each of the antennas;

an RF transmit section for generating an output signal to be transmitted over at least one of the antennas;

a digital dataport;

a circuit for downconverting radio frequency signals, the circuit including (a) a first mixer connected to a first local oscillator for producing an adjustable first local oscillator frequency;

(b) a second mixer connected to a second local oscillator centered at a predetermined second local oscillator frequency; and

(c) a third mixer connected to a third local oscillator centered at a predetermined third local oscillator frequency; and

a databus interconnecting said RF receive section, said RF transmit section, and said digital dataport.

13. The subscriber unit of claim 12, wherein the first local oscillator frequency is adjustable in the range of approximately 2.125 to 2.205 GHz.

14. The subscriber unit of claim 12, wherein the second local oscillator frequency is approximately 225.85 MHz.

15. The subscriber unit of claim 12, wherein the third local oscillator frequency is approximately 9.932 Mhz.