Method and system for high data rate multi-channel WLAN architecture

• US 20050180314A1
• Filed: 01/12/2005
• Published: 08/18/2005
• Est. Priority Date: 01/12/2004
• Status: Active Grant

• Current Assignee: Intellectual Ventures I LLC (Intellectual Ventures LLC)
• Original Assignee: Conexant Systems Incorporated (Synaptics Incorporated)
• Inventors: Webster, Mark A., Shearer, Daniel D. III
• Granted Patent: US 8,027,326 B2
• Time in Patent Office: Days
• US Class Current: 370/208
• CPC Class Codes: H04B 7/02 Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas RAKE receivers H04B1/7115
• CPC Class Codes: H04L 5/023 Multiplexing of multicarrier modulation signals multicarrier modulation H04L27/2601

Abstract

A method and system provides a way to achieve very high data rate expanded bandwidth (wide band) WLAN operations reusing existing single channel radio designs. The system provides a dual-channel form of operation for greater flexibility and performance across multiple platforms. Further, the system provides adaptive anti-aliasing techniques for eliminating aliasing due to adjacent channel waveform effects. These techniques mesh with existing systems cleanly.

Claims

1. A method for increasing data rates and data throughput in a network, the method comprising the steps of:

identifying at least a first channel and a second channel;

combining the first channel and the second channel using channel bonding with orthogonal frequency division multiplexing (OFDM); and

transmitting the first channel and the second channel in parallel to a receiver.

2. The method of claim 1 wherein the step of combining further comprises the step of:

interleaving one of a legacy signal and a wide signal during packet transmission.

3. The method of claim 2 wherein the legacy signal comprises one channel and wherein the wide signal comprises multiple channels.

4. The method of claim 1 wherein the step of transmitting comprises transmitting to multiple radios.

5. The method of claim 1 wherein the step of transmitting comprises transmitting to a single radio.

6. The method of claim 1 wherein the method is extensible to additional channels.

7. The method of claim 1 wherein synthesizer frequency popping is eliminated during bandwidth switching between packets.

8. The method of claim 1 wherein each synthesizer is tuned to its individual channel during mode switching.

9. The method of claim 1 further comprising the steps of:

identifying a gap between two signals; and

filling the gap with subcarriers.

10. The method of claim 9 wherein the subcarriers are OFDM subcarriers.

11. The method of claim 10 further comprising the steps of:

identifying additional points in FFT across the multiple channels; and

adding subcarriers to the additional points.

12. The method of claim 11 wherein the additional points exist on an outer edge of the channel.

13. The method of claim 12 wherein a guard band on each edge is filled with data.

14. The method of claim 1 further comprising the step of implementing an anti-aliasing technique at a receiver.

15. The method of claim 14 wherein the anti-aliasing technique comprises passing upper signals and lower signals through a first filter and a second filter.

16. A high data rate multi-channel wireless network comprising:

an access point having a first transceiver adapted to receive and transmit signals based on a first protocol and a second transceiver adapted to receive and transmit signals based on a second different protocol;

a first mobile transceiver adapted to receive signals based on the first protocol;

a second mobile transceiver adapted to receive signals based on the second protocol;

whereby the access point is adapted to switch modes of operation between the first and second protocols and to generate instructions to the first and second mobile transceivers concerning availability of the network to the first and second mobile transceivers.

17. The network of claim 16 wherein the network is a WLAN network and the first protocol is one of IEEE 802.11a and IEEE 802.11g standards and the second protocol is IEEE 802.11n standard.