Systems and methods for wireless communication over a wide bandwidth channel using a plurality of sub-channels

• US 20080049652A1
• Filed: 10/18/2007
• Published: 02/28/2008
• Est. Priority Date: 12/06/2001
• Status: Abandoned Application

• Current Assignee: Intellectual Ventures Holding 73 LLC (Intellectual Ventures LLC)
• Original Assignee: Intellectual Ventures Holding 73 LLC (Intellectual Ventures LLC)
• Inventors: Lakkis, Ismail
• Application Number:
  US11/975,606
• Publication Number:
  US 20080049652A1
• Time in Patent Office: Days
• US Class Current: 370/310
• CPC Class Codes: H04B 1/71632 Signal aspects H04B1/7172 and H04B1/7176 take precedence
• CPC Class Codes: H04B 1/71635 Transmitter aspects H04B1/7174 takes precedence

Abstract

A method of communicating over a wideband communication channel divided into a plurality of sub-channels comprises dividing a single serial message intended for one of the plurality of communication devices into a plurality of parallel messages, encoding each of the plurality of parallel messages onto at least some of the plurality of sub-channels, and transmitting the encoded plurality of parallel messages to the communication device over the wideband communication channel. This Abstract is provided for the sole purpose of complying with the Abstract requirement rules that allow a reader to quickly ascertain the subject matter of the disclosure contained herein. This Abstract is submitted with the explicit understanding that it will not be used to interpret or to limit the scope or the meaning of the claims.

Claims

1. A base station configured to communicate with a plurality of communication devices over a wideband communication channel comprising an overall bandwidth segmented into a plurality of sub-channels, the base station configured to:

divide a single serial message intended for one of the plurality of communication devices into a plurality of parallel messages;

encode each of the plurality of parallel messages onto at least some of the plurality of sub-channels; and

transmit the encoded plurality of parallel messages to the communication device over the wideband communication channel.

2. The base station of claim 1, further configured to:

assign one or more of the plurality of sub-channels to each of the plurality of communication devices;

divide each of a plurality of serial messages, which are each intended for one of the plurality of communication devices, into a plurality of parallel messages;

encode each of the plurality of parallel messages onto the subchannels assigned to the corresponding communication device; and

transmit the encoded plurality of parallel messages to each of the plurality of communication devices over the wideband communication channel.

3. The base station of claim 1, further configured to assign the sub-channels to particular communication devices based at least in part on a plurality of signal-to-interference measurements received from each of the plurality of communication devices.

4. The base station of claim 1, configured to:

organize the plurality of sub-channels into at least one sub-channel group;

receive a mean signal-to-interference measurement from each of the plurality of communication devices for each sub-channel group;

compare each mean signal interference measurement to a threshold value; and

assign at least one sub-channel group to particular communication devices of the plurality of communication devices based on the comparisons of the mean signal interference ratio measurements to the threshold value.

5. The base station of claim 1, further configured to:

assign one or more of the plurality of sub-channels to each of the plurality of communication devices;

generate a bit stream for each assigned sub-channel;

shift each bit stream in frequency by a frequency offset associated with the corresponding sub-channel;

sum the shifted bit streams to generate a single transmit signal that occupies the entire overall bandwidth; and

transmit the single transmit signal to each of the plurality of communication devices assigned a sub-channel.

6. The base station of claim 1, wherein each sub-channel comprises a bandwidth that is defined by the following equation:

b=(1+r)/T;

where

b=a bandwidth for each of the plurality of sub-channels

r=a roll-off factor; and

T=a symbol duration for each of the plurality of sub-channels, and wherein the overall bandwidth is defined by the following equation;

B=N(1+r)/T;

where

B=an overall bandwidth; and

N=a number of sub-channels.

7. The base station of claim 6, wherein the roll-off factor is selected so that M in the following equation is approximately an integer:

M=N(1+r).

8. A communication system, comprising:

a plurality of communication devices; and

a base station configured to communicate with the plurality of communication devices over a wideband communication channel comprising a bandwidth segmented into a plurality of subchannels, the base station configured to;

divide a single serial message intended for one of the plurality of communication devices into a plurality of parallel messages;

encode each of the plurality of parallel messages onto at least some of the plurality of sub-channels; and

transmit the encoded plurality of parallel messages to the communication device over the wideband communication channel.

10. The communication system of claim 8, further configured to assign the sub-channels to particular communication devices based at least in part on a plurality of signal-to-interference measurements received from each of the plurality of communication devices.

11. The communication system of claim 8, configured to:

organize the plurality of sub-channels into sub-channel group;

receive a mean signal-to-interference measurement from each of

the plurality of communication devices for each sub-channel group;

compare each mean signal interference measurement to a threshold value; and

assign sub-channel groups to particular communication devices of the plurality of communication devices based on the comparisons of the mean signal interference ratio measurements to the threshold value.

13. The communication system of claim 8, further configured to:

assign one or more of the plurality of sub-channels to each of the plurality of communication devices;

generate a bit stream for each assigned sub-channel;

shift each bit stream in frequency by a frequency offset associated with the corresponding sub-channel;

sum the shifted bit streams to generate a single transmit signal that occupies an entire overall bandwidth; and

transmit the single transmit signal to each of the plurality of communication devices assigned a sub-channel.

9. The communication system 8, further configured to:

assign one or more of the plurality of sub-channels to each of the plurality of communication devices;

divide each of a plurality of serial messages, which are each intended for one of the plurality of communication devices, into a plurality of parallel messages;

encode each of the plurality of parallel messages onto the subchannels assigned to the corresponding communication device; and

transmit the encoded plurality of parallel messages to each of the plurality of communication devices over the wideband communication channel.

12. The communication system of claim 9, wherein each of the plurality of communication devices is further configured to combine the encoded messages into a single serial message.

14. A method of communicating over a wideband communication channel divided into a plurality of sub-channels, comprising:

dividing a single serial message intended for one of the plurality of communication devices into a plurality of parallel messages;

encoding each of the plurality of parallel messages onto at least some of the plurality of sub-channels; and

transmitting the encoded plurality of parallel messages to the communication device over the wideband communication channel.

15. The method of claim 14, further comprising:

assigning one or more of the plurality of sub-channels to each of the plurality of communication devices;

dividing each of a plurality of serial messages, which are each intended for one of the plurality of communication devices, into a plurality of parallel messages;

encoding each of the plurality of parallel messages onto the subchannels assigned to the corresponding communication device; and

transmitting the encoded plurality of parallel messages to each of the plurality of communication devices over the wideband communication channel.

16. The method of claim 14, further comprising changing the number of communication devices assigned sub-channels based at least in part on a plurality of signal-to-interference measurements received from each of the plurality of communication devices.

17. The method of claim 14, further comprising:

organizing the plurality of sub-channels into at least one sub-channel group;

receiving a mean signal-to-interference measurement from each of the plurality of communication devices for each sub-channel group;

comparing each mean signal interference measurement to a threshold value; and

assigning sub-channel groups to particular communication devices of the plurality of communication devices based on the comparisons of the mean signal interference ratio measurements to the threshold value.

18. The method of claim 14, further comprising:

assigning one or more of the plurality of sub-channels to each of

the plurality of communication devices;

generating a bit stream for each assigned sub-channel;

shifting each bit stream in frequency by a frequency offset associated with the corresponding sub-channel;

summing the shifted bit streams to generate a single transmit signal that occupies the entire overall bandwidth; and

transmitting the single transmit signal to each of the plurality of communication devices assigned a sub-channel.