Switched antenna diversity transmission method and system

• US 5,689,439 A
• Filed: 03/31/1995
• Issued: 11/18/1997
• Est. Priority Date: 03/31/1995
• Status: Expired due to Term

• Current Assignee: Lucent Technologies, Inc. (Nokia Corporation)
• Original Assignee: Lucent Technologies, Inc. (Nokia Corporation)
• Inventors: Zeng, William Glenn, Weerackody, Vijitha
• Primary Examiner(s): Chin, Wellington
• Assistant Examiner(s): Carman, Melissa Kay
• Application Number:
  US08/414,987
• Time in Patent Office: 963 Days
• Field of Search: 371/43, 371/30, 371/37.1, 371/37.4, 371/35, 371/40.3, 375/267, 375/347, 375/224, 455/135, 455/101, 455/277.1, 455/277.2, 455/121, 455/52.3, 455/56.1, 364/514 R, 364/400, 348/264, 348/393, 348/394, 348/395, 348/396, 348/398, 348/409, 358/432, 358/433, 358/426
• US Class Current: 370/329
• CPC Class Codes: H04B 7/061 using feedback from receiving side
• CPC Class Codes: H04L 1/0068 by puncturing
• CPC Class Codes: H04L 1/0071 Use of interleaving interleaving per se H03M13/27
• CPC Class Codes: H04L 1/04 using frequency diversity
• CPC Class Codes: H04L 1/06 using space diversity
• CPC Class Codes: H04L 1/18 Automatic repetition systems, e.g. Van Duuren systems
• CPC Class Codes: H04L 1/1819 with retransmission of additional or different redundancy
• CPC Class Codes: H04L 2001/0098 Unequal error protection

Abstract

The present invention is an improved switched antenna diversity transmission system for use with an ARQ error protection protocol. The transmitter of the present invention includes an error detection encoder for encoding information packets with an error detection code, a modulator for modulating the encoded information packets, and a first antenna for transmitting the modulated information packets over a first forward channel of a wireless communication medium to the receiver. The transmitter further includes a switch for switching from the first antenna to a second antenna for transmitting the information packets over a second forward channel of a wireless communication medium in response to a negative acknowledgment from the receiver transmitted over a feedback channel of the wireless communication medium.

Claims

1. A transmitter for transmitting information packets over a wireless communication medium to a receiver, comprising:

an error detection encoder for encoding the information packets with an error detection code;

a modulator for modulating the error detection encoded information packets;

a first antenna for transmitting the modulated information packets over a first forward channel of the communication medium to the receiver;

a second antenna for transmitting the modulated information packets over a second forward channel of the communication medium to the receiver in place of the first antenna; and

a switch for switching from the first antenna to the second antenna in response to a negative acknowledgement from the receiver transmitted over a feedback channel of the communication medium.

2. The transmitter of claim 1, wherein the first forward channel is a slow fading channel.

3. The transmitter of claim 1, wherein the second forward channel is a slow fading channel.

4. The transmitter of claim 1, wherein the error detection encoder is a CRC-16 encoder.

5. The transmitter of claim 1, wherein the modulator is a 4-DPSK modulator.

6. The transmitter of claim 1, wherein the switch is a hardware switch.

7. The transmitter of claim 1, wherein the switch is a programmable switch.

8. The transmitter of claim 1, wherein the switch is an electronic switch.

9. The transmitter of claim 1, wherein the switch is a magnetic switch.

10. A method of transmitting information packets over a wireless communication medium to a receiver, comprising:

encoding the information packets with an error detection code;

modulating the error detection encoded information packets;

transmitting the modulated information packets from a first antenna over a first forward channel of the communication medium to the receiver; and

switching from the first antenna to a second antenna for transmitting the modulated packets over a second forward channel of the communication medium in response to a negative acknowledgement from the receiver transmitted over a feedback channel of the communication medium.

11. A transmitter for transmitting a JPEG image over a wireless communication medium to a receiver with unequal error protection, comprising:

a separator for separating the JPEG image into Type-I and Type-II information;

an error detection encoder for encoding the Type-I information with an error detection code;

an error correction encoder for encoding the Type-II information with an error correction code;

a modulator for modulating the encoded Type-I and Type-II information;

a first antenna for transmitting the modulated Type-I and Type-II information over a first forward channel of the communication medium to the receiver;

a second antenna for transmitting the modulated Type-I and Type-II information over a second forward channel of the communication medium to the receiver in place of the first antenna; and

a switch for switching from the first antenna to the second antenna in response to a negative acknowledgment from the receiver transmitted over a feedback channel of the communication medium.

12. The transmitter of claim 11, wherein the first forward channel is a slow fading channel.

13. The transmitter of claim 11, wherein the second forward channel is a slow fading channel.

14. The transmitter of claim 11, wherein the separator is a digital signal processor.

15. The transmitter of claim 14, wherein the digital signal processor is an AT&

T DSP32C.

16. The transmitter of claim 11, wherein the error correction encoder encodes the Type-II information with a rate 1/2, memory 4 convolutional code.

17. A transmitter for transmitting a JPEG image over a wireless communication medium to a receiver with unequal error protection, comprising:

a separator for separating the JPEG image into Type-IA and Type-IB information;

an error detection encoder for encoding the Type-IA information with an error detection code;

an error correction encoder for encoding the Type-IB information with an error correction code;

a modulator for modulating the encoded Type-IA and Type-IB information;

a first antenna for transmitting the modulated Type-IA and Type-IB information over a first forward channel of the communication medium to the receiver;

a second antenna for transmitting the modulated Type-IA and Type-IB information over a second forward channel of the communication medium to the receiver in place of the first antenna; and

a switch for switching from the first antenna to the second antenna in response to a negative acknowledgment from the receiver transmitted over a feedback channel of the communication medium.

18. A transmitter for transmitting a JPEG image over a wireless communication medium to a receiver with unequal error protection, comprising:

a separator for separating the JPEG image into Type-I and Type-II information;

an error detection encoder for encoding the Type-I information with an error detection code;

a modulator for modulating the encoded Type-I information and the Type-II information;

a first antenna for transmitting the modulated Type-I and Type-II information over a first forward channel of the communication medium to the receiver;

a second antenna for transmitting the modulated Type-I and Type-II information over a second forward channel of the communication medium to the receiver in place of the first antenna; and

a switch for switching from the first antenna to the second antenna in response to a negative acknowledgment from the receiver transmitted over a feedback channel of the communication medium.

19. A transmitter for transmitting a JPEG image over a wireless communication medium to a receiver with unequal error protection, comprising:

a separator for separating the JPEG image into Type-IA and Type-IB information;

an error detection encoder for encoding the Type-IA information with an error detection code;

a modulator for modulating the encoded Type-IA information and the Type-IB information;

a first antenna for transmitting the modulated Type-IA and Type-IB information over a first forward channel of the communication medium to the receiver;

a second antenna for transmitting the modulated Type-IA and Type-IB information over a second forward channel of the communication medium to the receiver in place of the first antenna; and

a switch for switching from the first antenna to the second antenna in response to a negative acknowledgment from the receiver transmitted over a feedback channel of the communication medium.

20. A method for transmitting a JPEG image over a wireless communication medium to a receiver with unequal error protection, comprising:

separating the JPEG image into Type-I and Type-II information;

encoding the Type-I information with an error detection code;

encoding the Type-II information with an error correction code;

modulating the encoded Type-I and Type-II information;

transmitting the modulated Type-I and Type-II information from a first antenna over a first forward channel of the communication medium to the receiver; and

switching from the first antenna to a second antenna for transmitting the modulated Type-I and Type-II information over a second forward channel of the communication medium in response to a negative acknowledgment from the receiver transmitted over a feedback channel of the communication medium.

21. A method for transmitting a JPEG image over a wireless communication medium to a receiver with unequal error protection, comprising:

separating the JPEG image into Type-IA and Type-IB information;

encoding the Type-IA information with an error detection code;

encoding the Type-IA information with an error correction code;

modulating the encoded Type-IA and Type-IB information;

transmitting the modulated Type-IA and Type-IB information from a first antenna over a first forward channel of the communication medium to the receiver; and

switching from the first antenna to a second antenna for transmitting the modulated Type-I and Type-II information over a second forward channel of the communication medium in response to a negative acknowledgment from the receiver transmitted over a feedback channel of the communication medium.

22. A method of transmitting a JPEG image over a wireless communication medium to a receiver with unequal error protection, comprising:

separating the JPEG image into Type-I and Type-II information;

encoding the Type-I information with an error detection code;

modulating the encoded Type-I information and the Type-II information;

transmitting the modulated Type-I and Type-II information from a first antenna over a first forward channel of the communication medium to the receiver; and

switching from the first antenna to a second antenna for transmitting the modulated Type-I and Type-II information over a second forward channel of the communication medium in response to a negative acknowledgment from the receiver transmitted over a feedback channel of the communication medium.

23. A method of transmitting a JPEG image over a wireless communication medium to a receiver with unequal error protection, comprising:

separating the JPEG image into Type-IA and Type-IB information;

encoding the Type-IA information with an error detection code;

modulating the encoded Type-IA information and the Type-IB information;

transmitting the modulated Type-IA and Type-IB information from a first antenna over a first forward channel of the communication medium to the receiver; and

switching from the first antenna to a second antenna for transmitting the modulated Type-IA and Type-IB information over a second forward channel of the communication medium in response to a negative acknowledgment from the receiver transmitted over a feedback channel of the communication medium.