Transmission of wide bandwidth signals in a network having legacy devices

• US 7,400,643 B2
• Filed: 10/26/2004
• Issued: 07/15/2008
• Est. Priority Date: 02/13/2004
• Status: Active Grant

• Current Assignee: Broadcom Corporation (Broadcom, Inc.)
• Original Assignee: Broadcom Corporation (Broadcom, Inc.)
• Inventors: Moorti, R. Tushar, Hansen, Christopher J., Trachewsky, Jason A.
• Primary Examiner(s): Le; Danh C
• Application Number:
  US10/973,612
• Publication Number:
  US 20050190724A1
• Time in Patent Office: 1,358 Days
• Field of Search: 370/465, 370/329, 370/338, 370/348, 455/452.2, 455/450, 455/452.1, 709/230
• US Class Current: 370/465
• CPC Class Codes: H04L 25/0226 sounding signals per se
• CPC Class Codes: H04L 27/2613 Structure of the reference signals
• CPC Class Codes: H04L 5/0023 Time-frequency-space
• CPC Class Codes: H04L 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver
• CPC Class Codes: H04W 16/14 Spectrum sharing arrangements between different networks
• CPC Class Codes: H04W 24/00 Supervisory, monitoring or testing arrangements
• CPC Class Codes: H04W 84/12 WLAN [Wireless Local Area Networks]
• CPC Class Codes: H04W 88/06 adapted for operation in multiple networks or having at least two operational modes, e.g. multi-mode terminals

Abstract

A method for transmitting wide bandwidth signals in a network that includes legacy devices begins by determining channel bandwidth of a channel that supports the wide bandwidth signals in the network. The method continues by determining overlap of legacy channel bandwidth with the channel bandwidth of the channel. The method continues by providing a legacy readable preamble section within the channel where the legacy channel bandwidth overlaps the channel bandwidth of the channel.

Claims

1. A method for transmitting wide bandwidth signals in a network that includes legacy devices, the method comprises:

determining channel bandwidth of a channel that supports the wide bandwidth signals in the network;

determining overlap of legacy channel bandwidth with the channel bandwidth of the channel; and

providing a legacy readable preamble portion as part of a frame transmitted within the channel where the legacy device is operable to interpret the legacy readable preamble portion but not operable to interpret remaining portions of the frame.

2. The method of claim 1 further comprises:

utilizing at least a portion of payload spectrum of the channel for packet header transmission, wherein the packet header transmission includes at least a portion of the legacy readable preamble.

3. The method of claim 2, wherein the utilizing the at least a portion of the payload spectrum comprises at least one of:

utilizing a same power spectral density for the packet header transmission and for the payload; and

utilizing a different power spectral density for the packet header transmission and for the payload.

4. The method of claim 1 further comprises:

interpreting, by the legacy devices, the legacy readable preamble such that the legacy devices appropriately defer transmissions and decode a portion of the wide bandwidth signals within a channel spectrum of the legacy devices.

5. The method of claim 1 further comprises:

generating a wide-bandwidth preamble of the wide bandwidth signals for at least one of;

Carrier detection;

Gain control;

Frequency offset estimation;

Channel estimation;

Transmission Deference; and

Data demodulation.

6. A radio frequency (RF) transmitter comprises:

a baseband processing module operably coupled to convert outbound data into an outbound symbol stream; and

a transmitter section operably coupled to convert the outbound symbol stream into outbound RF signals, wherein the baseband processing module is operably coupled to;

determine channel bandwidth of a channel that supports the wide bandwidth signals in the network;

determine overlap of legacy channel bandwidth with the channel bandwidth of the channel; and

provide a legacy readable preamble portion as part of a frame transmitted within the channel wherein a legacy device is operable to interpret the legacy readable preamble portion but not operable to interpret remaining portions of the frame.

7. The RF transmitter of claim 6, wherein the baseband processing module is further operably coupled to:

utilize at least a portion of payload spectrum of the channel for packet header transmission, wherein the packet header transmission includes at least a portion of the legacy readable preamble.

8. The RF transmitter of claim 7, wherein the baseband processing module is further operably coupled to utilize the at least a portion of the payload spectrum by at least one of:

utilizing a same power spectral density for the packet header transmission and for the payload; and

utilizing a different power spectral density for the packet header transmission and for the payload.

9. The RF transmitter of claim 6, wherein the baseband processing module is further operably coupled to:

generate a wide-bandwidth preamble of the wide bandwidth signals for at least one of;

Carrier detection;

Gain control;

Frequency offset estimation;

Channel estimation;

Transmission Deference; and

Data demodulation.