Method and apparatus for improving reception of wireless signals using spartial redundancy

• US 8,839,310 B2
• Filed: 10/17/2005
• Issued: 09/16/2014
• Est. Priority Date: 03/29/2005
• Status: Active Grant

• Current Assignee: InterDigital Madison Patent Holdings (InterDigital, Inc.)
• Original Assignee: Thomson Licensing (Vantiva SA)
• Inventors: Ramaswamy, Kumar
• Primary Examiner(s): Dubasky, Gigi L
• Application Number:
  US11/887,304
• Publication Number:
  US 20090276811A1
• Time in Patent Office: 3,256 Days
• Field of Search: 725 1-153
• US Class Current: 725/62
• CPC Class Codes: H04L 1/0041 Arrangements at the transmitter end
• CPC Class Codes: H04L 1/06 using space diversity

Abstract

Data for one, or more, services is encoded using a scalable channel code and divided for transmission over N transmitters such that reception by a receiver of at least M of the transmitted signals, where M<N, enables recovery of the data by the receiver. In other words, even if reception for any one particular transmitted signal in a defined geographical region is not guaranteed, reception of at least M of the other transmitted signals enables reception of the service(s). Thus, one, or more, services can be offered across an entire geographical area notwithstanding the existence of areas of poor, or no, reception.

Claims

1. A wireless transmitting system comprising:

a fountain coder for fountain encoding a data stream;

a demultiplexer for demultiplexing the fountain encoded data stream into N different portions, where N>

1; and

N transmitters, each transmitter for wirelessly broadcasting a respective digital multiplex, each respective digital multiplex including a primary channel and an auxiliary channel, the auxiliary channel including a respective one of the N different portions of the fountain encoded data stream, the primary channel including one or more non-fountain coded data streams,

wherein;

the N transmitters are geographically separated, and

the fountain encoded data stream can be recovered using M different portions of the fountain encoded data stream to enable reception of a service, where M<

N.

2. The system of claim 1, wherein the primary channel includes one, or more, high resolution video channels.

3. The system of claim 1, wherein the primary channel represents an ATSC-DTV (Advanced Television Systems Committee-Digital Television) signal.

4. A wireless receiver comprising:

M tuners for use in wirelessly receiving M of N respective different transport streams, each of the N respective different transport streams including a primary channel and an auxiliary channel, being transmitted from one of N geographically separated transmitters, and providing a respective one of N different portions of a fountain encoded data stream representing the auxiliary channel and one or more non-fountain coded data streams representing the primary channel, where N>

M>

1;

a fountain decoder for use in decoding M of N different portions of the fountain encoded data stream to provide a decoded data stream enabling reception of a service; and

a controller for tuning at least one of the M tuners for recovery of the one or more non-fountain coded data streams representing the primary channel.

5. The receiver of claim 4, wherein the primary channel conveys at least one high definition TV (HDTV) channel.

6. The receiver of claim 5, wherein the primary channel represents an ATSC-DTV (Advanced Television Systems Committee-Digital Television) signal.

7. The receiver of claim 4 comprising:

a multiplexer for combining the M of N different portions of the fountain encoded data stream to provide the fountain encoded data stream, wherein the fountain decoder decodes the fountain encoded data stream to provide the decoded data stream.

8. A method for use in a wireless transmitting system comprising:

fountain encoding a data stream;

demultiplexing the fountain encoded data stream into N different portions, where N>

1, and

wirelessly broadcasting from each of N transmitters a respective different digital multiplex, each respective different digital multiplex including a primary channel and an auxiliary channel, the auxiliary channel including a respective one of the N different portions of the fountain encoded data stream, the primary channel including one or more non-fountain coded data streams,

wherein;

the N transmitters are geographically separated, and

the fountain encoded data stream can be recovered using M different portions of the fountain encoded data stream to enable reception of a service, where M<

N.

9. The method of claim 8, wherein the primary channel includes one, or more, high resolution video channels.

10. The method of claim 9, wherein the primary channel represents an ATSC-DTV (Advanced Television Systems Committee-Digital Television) signal.

11. A method for use in a wireless receiver, the method comprising:

for wirelessly receiving a primary channel, tuning one of M tuners for providing a non-fountain coded data stream representing the primary channel;

for wirelessly receiving an auxiliary channel, tuning M tuners to receive M of N respective different transport streams, each of the N respective different transport streams including the primary channel and the auxiliary channel, being transmitted from one of N geographically separated transmitters, and providing a respective one of N different portions of a fountain encoded data stream representing the auxiliary channel, where N>

M>

1; and

fountain decoding the M of N different portions of the fountain encoded data stream to provide a decoded data stream enabling reception of a service.

12. The method of claim 11, wherein the primary channel conveys at least one high definition TV (HDTV) channel.

13. The method of claim 12, wherein the primary channel represents an ATSC-DTV (Advanced Television Systems Committee-Digital Television) signal.

14. The method of claim 11 comprising:

combining the M of N different portions of the fountain encoded data stream to provide the fountain encoded data stream, wherein fountain decoding includes decoding the fountain encoded data stream to provide the decoded data stream.