Fixed OFDM wireless man utilizing CPE having internal antenna

• US 20050176378A1
• Filed: 04/01/2005
• Published: 08/11/2005
• Est. Priority Date: 10/22/1999
• Status: Abandoned Application

• Current Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Original Assignee: NextNet Wireless, Inc. (Motorola Solutions, Inc.)
• Inventors: Dunn, J. Eric, Grindahl, Mervin L., Kelman, Vladimir Z., Froelich, Stuart A., Barnes, Keith W.
• Application Number:
  US11/097,500
• Publication Number:
  US 20050176378A1
• Time in Patent Office: Days
• US Class Current: 455/68
• CPC Class Codes: H01Q 1/2291 used in bluetooth or WI-FI devices of Wireless Local Area Networks [WLAN] H01Q1/241 takes precedence; WLAN in general H04W
• CPC Class Codes: H04L 27/2601 Multicarrier modulation systems
• CPC Class Codes: H04L 27/2657 Carrier synchronisation
• CPC Class Codes: H04L 27/2662 Symbol synchronisation
• CPC Class Codes: H04L 5/0007 the frequencies being orthogonal, e.g. OFDM(A), DMT
• CPC Class Codes: H04W 8/26 Network addressing or numbering for mobility support
• CPC Class Codes: H04W 84/14 WLL [Wireless Local Loop]; RLL [Radio Local Loop]
• CPC Class Codes: H04W 88/02 Terminal devices
• CPC Class Codes: H04W 88/021 adapted for Wireless Local Loop operation
• CPC Class Codes: H04W 88/08 Access point devices

Abstract

A fixed wireless access system generally comprises a consumer premise equipment (CPE) unit, that is connected via an Ethernet interface to a personal computer or local area network, and a base station unit that is connected via an Ethernet interface to a network. As such, the CPE unit is preferably easily user-installed while the base station unit is preferably tower-mounted within a 1-5 mile range of the CPE unit. Both the CPE unit and base station unit preferably incorporate an integrated data transceiver/switch that enables a radio frequency air link operating in the 2.5-2.686 GHz range. Orthogonal frequency division multiplexing is used in the uplink and downlink transmissions between CPE units and base station units.

Claims

1. A wireless communication system, comprising:

a receiver and a transmitter, wherein said transmitter transmits to said receiver via radio frequency, and wherein said transmitter transmits an orthogonal frequency division multiplexed (OFDM) signal having a plurality of OFDM symbols, wherein said receiver detects said OFDM signal in an OFDM symbol-by-OFDM symbol manner, and wherein said plurality of OFDM symbols are without a training symbol.

2. The system of claim 1 wherein said OFDM signal has been coded by a Reed/Solomon encoder and a ½

-rate convolutional encoder.

3. The system of claim 2 wherein the Reed/Solomon coding is decoded by said receiver and used by said receiver to correct for burst errors.

4. The system of claim 1 wherein said plurality of OFDM symbols comprise data and detection aiding information that is used by said receiver to demodulate said OFDM signal.

5. The system of claim 1 wherein said OFDM signal includes a cyclical prefix and wherein said cyclical prefix is utilized by said receiver to determine a coarse timing of said OFDM signal.

6. The system of claim 5 wherein said cyclical prefix is utilized by said receiver to determine a fine frequency of said OFDM signal.

7. The system of claim 1 wherein said plurality of OFDM symbols include pilot subsymbols, and wherein said pilot subsymbols are utilized by said receiver to determine a fine timing of said OFDM signal.

8. The system of claim 7 wherein said pilot subsymbols are utilized by said receiver to determine a coarse frequency of said OFDM signal.

9. The system of claim 1 wherein said OFDM signal is the results of said transmitter performing orthogonal frequency division modulation on a plurality of quadrature phase-shift keying (QPSK) subsymbols.

10. The system of claim 9 wherein said QPSK subsymbols are the results of said transmitter performing QPSK modulation on a coded bit stream.

11. The system of claim 10 wherein said QPSK modulation a cellular deployment of said receiver and transmitter wherein a 1:

1 frequency reuse pattern is utilized.

12. The system of claim 10 wherein said coded bit stream includes a plurality of nulled center bits.

13. The system of claim 1 wherein said transmitter is selected from a group consisting of:

a base station unit and a computer premise equipment (CPE) unit; and

wherein said receiver is selected from a group consisting of;

a base station unit and a CPE unit.