Ubiquitous coverage OFDM hybrid system

• US 20070121743A1
• Filed: 11/22/2006
• Published: 05/31/2007
• Est. Priority Date: 11/25/2005
• Status: Abandoned Application

• Current Assignee: Gonet Systems Ltd.
• Original Assignee: GO Networks, Inc. (AT&T, Inc.)
• Inventors: Zuckerman, Gal, Kinamon, Roy, Leave, Oz
• Application Number:
  US11/602,967
• Publication Number:
  US 20070121743A1
• Time in Patent Office: Days
• US Class Current: 375/260
• CPC Class Codes: H04L 27/2601 Multicarrier modulation systems
• CPC Class Codes: H04W 56/00 Synchronisation arrangements

Abstract

Methods and systems for Ubiquitous coverage OFDM hybrid point to multipoint communication system, including the steps of: determining transmission synchronization and bandwidth allocation between a first wireless client and a second wireless client communicating via a common wireless communication channel, by using a wireless point to multi point centralized synchronizing communication controller; transmitting to the air a download multi carrier transmission, via the common wireless communication channel using a first wireless frequency, wherein the download multi carrier transmission comprises the determined transmission synchronization and bandwidth allocation; receiving the download multi carrier transmission by a first hybrid converter and by a second hybrid converter; shifting the frequency of the download multi carrier transmission from the first wireless frequency to a second wireless frequency in the first hybrid converter and in the second hybrid converter; and transmitting the frequency-shifted download multi carrier transmission to the air from the first hybrid converter and from the second hybrid converter using the second wireless frequency, wherein the transmission coverage areas of the first and of the second hybrid converters are at least partially overlapping, and wherein the first wireless client is located in the overlapping coverage area.

Claims

1. A method comprising:

determining transmission synchronization and bandwidth allocation between a first wireless client and a second wireless client communicating via a common wireless communication channel, by using a wireless point to multi point centralized synchronizing communication controller;

transmitting to the air a download multi carrier transmission, via the common wireless communication channel using a first wireless frequency, wherein the download multi carrier transmission comprises the determined transmission synchronization and bandwidth allocation;

receiving the download multi carrier transmission by a first hybrid converter and by a second hybrid converter;

shifting the frequency of the download multi carrier transmission from the first wireless frequency to a second wireless frequency in the first hybrid converter and in the second hybrid converter;

transmitting the frequency-shifted download multi carrier transmission to the air from the first hybrid converter and from the second hybrid converter using the second wireless frequency, wherein the transmission coverage areas of the first and of the second hybrid converters are at least partially overlapping, and wherein the first wireless client is located in the overlapping coverage area.

2. The method of claim 1, further comprising the steps of:

receiving by the first wireless client a superposition of the frequency-shifted download multi carrier transmissions from the first and from the second hybrid converters; and

transmitting an upload multi carrier transmission to the air, in the second wireless frequency, according to the determined transmission synchronization and bandwidth allocation, by the first wireless client.

3. The method of claim 2, further comprising the steps of:

receiving the upload multi carrier transmission by the first and by the second hybrid converters, and shifting the frequency of the upload transmission from the second wireless frequency to the first common wireless communication channel frequency; and

receiving a superposition of the frequency-shifted received upload multi carrier transmission from the first and the second hybrid converters, via the common wireless communication channel, by the wireless point to multi point centralized synchronizing communication controller.

4. The method of claim 2, further comprising modulating the upload transmission by an OFDMA modulation and using an amount of sub-channels that is smaller than the entire composition of the OFDMA channel.

5. The method of claim 2, further comprising modulating the upload transmission by an OFDMA modulation and using one sub-channel.

6. The method of claim 2, wherein the download transmission and the upload transmission further comprise payloads.

7. The method of claim 1, wherein the download transmission further comprises a payload.

8. The method of claim 1, wherein the multi carrier signal is an OFDM or OFDMA signal and wherein the centralized synchronizing communication controller comprises a MAC used by an IEEE 802.16 orthogonal multi carrier modulation.

9. The method of claim 1, wherein the wireless clients are standard IEEE 802.16 orthogonal multi carrier modulation mobile clients.

10. A point to multipoint communication system comprising:

a common wireless communication channel using a first frequency;

a first and a second bi-directional hybrid converters linked to the common wireless communication channel;

wherein the hybrid converters use the first frequency for communicating over the common wireless communication channel and use a second frequency for communicating with a first and a second wireless clients;

a centralized synchronizing communication controller communicating with the first and the second wireless clients via the common wireless communication channel and the bi-directional hybrid converters;

wherein the communications are modulated using orthogonal multi-carrier modulation and are transported over the common wireless communication channel, and wherein the common wireless communication channel is bandwidth shared; and

the coverage areas of the first and of the second hybrid converters while transmitting in the second frequency are at least partially overlapping and the first client is located in the overlapping coverage area.

11. The system of claim 10, wherein the orthogonal multi carrier modulation is OFDM or OFDMA and the centralized synchronizing communication controller further comprises a MAC used by an IEEE 802.16 orthogonal multi carrier modulation.

12. The system of claim 10, wherein the wireless clients are standard IEEE 802.16 orthogonal multi carrier modulation mobile clients.

13. A method comprising:

selecting an area to be ubiquitously covered by one OFDM or OFDMA communication channel;

setting at least two hybrid converters having an aggregated coverage area that comprises the selected area;

connecting the hybrid converters, via a common communication channel, to a wireless point to multi point centralized synchronizing communication controller, using multi carrier signals having a first frequency;

creating a downlink ubiquitous coverage in the selected area by transmitting from the hybrid converters approximately the same downlink multi carrier signals having a second frequency, wherein the second frequency downlink signals are at least partially overlapping and are synchronizing and bandwidth allocating a first and a second wireless clients;

creating an uplink ubiquitous coverage by using the at least two hybrid converters for receiving a multi carrier uplink signal transmitted by the first wireless client.

14. The method of claim 13, further comprising the steps of:

receiving by the first wireless client the downlink multi carrier signals from the first and the second hybrid converters; and

transmitting a multi carrier uplink signal to the air, in the second frequency, by the first wireless client.

15. The method of claim 14, further comprising the steps of:

receiving the multi carrier uplink signal by the first and by the second hybrid converters, and shifting the frequency of the received multi carrier uplink signals from the second frequency to the first common communication channel frequency; and

receiving from the first and the second hybrid converters the superpositioned frequency-shifted received multi carrier uplink signals, via the common communication channel, by the centralized synchronizing communication controller.

16. The method of claim 14, further comprising modulating the multi carrier uplink signals by an OFDMA modulation and using an amount of sub-channels that is smaller than the entire composition of the OFDMA channel.

17. The method of claim 14, further comprising modulating the multi carrier uplink signals by an OFDMA modulation and using one sub-channel.

18. The method of claim 13, wherein the common communication channel is selected from the group of:

twisted pair, coax, fiber optics, and a combination thereof.

19. The method of claim 13, wherein the common communication channel is a wireless channel.

20. The method of claim 13, wherein the wireless clients are standard IEEE 802.16 orthogonal multi carrier modulation mobile clients.