Fast fading packet diversity transmission method and system

• US 6,157,612 A
• Filed: 04/03/1995
• Issued: 12/05/2000
• Est. Priority Date: 04/03/1995
• Status: Expired due to Fees

• Current Assignee: AT&T IPM Corp. (AT&T, Inc.)
• Original Assignee: Lucent Technologies, Inc. (Nokia Corporation)
• Inventors: Zeng, William Glenn, Weerackody, Vijitha
• Primary Examiner(s): TON, DANG T
• Application Number:
  US08/415,893
• Time in Patent Office: 2,073 Days
• Field of Search: 370/94.1, 370/94.2, 370/94.3, 370/95.1, 370/95.2, 370/95.3, 370/60, 370/60.1, 370/85.13, 370/389, 370/535, 370/527, 370/204, 370/205, 370/206, 370/208, 370/212 , 370/213, 370/215, 370/347, 370/341, 370/350, 370/349, 370/337, 370/334, 370/338, 370/441, 375/347, 375/260, 375/283, 375/295, 375/267, 375/268, 375/241, 375/242, 375/243, 375/238, 375/261, 455/52.1, 455/33.3, 455/38.1, 455/10, 455/17, 455/23, 348/410, 348/384, 348/409, 348/716, 348/718, 714/746, 714/752
• US Class Current: 370/215
• CPC Class Codes: H04B 7/0604 with predefined switching scheme
• CPC Class Codes: H04B 7/061 using feedback from receiving side
• CPC Class Codes: H04B 7/0619 using feedback from receiving side feedback signaling for adaptive modulation/coding H04L1/0001
• CPC Class Codes: H04L 1/0071 Use of interleaving interleaving per se H03M13/27
• CPC Class Codes: H04L 1/06 using space diversity
• CPC Class Codes: H04L 1/16 in which the return channel carries supervisory signals, e.g. repetition request signals
• CPC Class Codes: H04L 1/1819 with retransmission of additional or different redundancy
• CPC Class Codes: H04L 1/1867 Arrangements specially adapted for the transmitter end
• CPC Class Codes: H04L 2001/0098 Unequal error protection

Abstract

The present invention is a fast fading packet diversity transmission method and system for reducing the effects of multipath fading on slow fading channels. One embodiment of the present invention includes a modulator for modulating information packets and a plurality of M multipliers for transmitting the modulated information packets from M antennas with up to M sets of M fixed phase offsets. Another embodiment of the present invention transmits a first group of information packets from M antennas with up to M sets of M fixed phase offsets and a second group of information packets with M slow time varying phase offsets.

Claims

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

a modulator for modulating the information packets;

groups of information packets over the wireless communication medium to the receiver.

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

3. The transmitter of claim 1, wherein the multiplier is a plurality of M multipliers.

4. The transmitter of claim 1, further comprising an error correction encoder for encoding the information packets with a forward error correction code.

5. The transmitter of claim 4, wherein the forward error correction code is block code.

6. The transmitter of claim 4, wherein the forward error correction code is a convolutional code.

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

a modulator for modulating first and second groups of information packets;

a multiplier for applying up to M sets of M fixed phase offsets to the first group of modulated information packets and for applying M slow time varying phase offsets to the second group of modulated information packets, wherein each modulated information packet in the first group is transmitted simultaneously from M antennas with a set of M fixed phase offsets, wherein each set of the M sets of M fixed phase offsets provides substantially independent fading characteristics for the transmission of a modulated information packet; and

a plurality of M antennas for transmitting the phase offset, modulated first and second groups of information packets over the wireless communication medium to the receiver.

8. The transmitter of claim 7, further comprising a multiplexer for multiplexing the second group of information packets with the information packets of the first group.

9. 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 multiplier for applying first and second sets of M fixed phase offsets to the modulated information packets for transmission of each modulated information packet simultaneously from M antennas with a set of M fixed phase offsets, wherein said second set of M fixed phase offsets is applied to the modulated information packets in response to a negative acknowledgement from the receiver, wherein the first and second sets of M fixed phase offsets each provide substantially independent fading characteristics; and

a plurality of M antennas for transmitting the phase offset, modulated information packets over the wireless communication medium.

10. The transmitter of claim 9, further comprising a switch for applying the second set of M fixed phase offsets in response to the negative acknowledgement.

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

an error detection encoder for encoding a first group of information packets with an error detection code for detecting errors in the information packets transmitted to the receiver;

a modulator for modulating the error detection encoded first group of information packets and a second group of information packets;

a first multiplier for applying first and second sets of M fixed phase offsets to the first group of modulated information packets for transmission of each modulated information packet in the first group simultaneously from M antennas with a set of M fixed phase offsets, wherein said second set of M fixed phase offsets is applied to the first group of information packets in response to a negative acknowledgement from the receiver, wherein the first and second sets of M fixed phase offsets each provide substantially independent fading characteristics; and

a plurality of M antennas for transmitting the phase offset, modulated first group of information packets and the modulated second group of information packets over the wireless communication medium to the receiver.

12. The transmitter of claim 11, further comprising a multiplexer for multiplexing the second group of information packets with the error detection encoded first group of information packets.

13. The transmitter of claim 11, further comprising a second multiplier for applying M slow time varying phase offsets to the second group of modulated information packets.

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

modulating the information packets;

applying up to M sets of M fixed phase offsets to the modulated information packets for transmission of each modulated information packet simultaneously from M antennas with a set of M fixed phase offsets, wherein each of the M sets of M fixed phase offsets provides substantially independent fading characteristics; and

transmitting the phase offset, modulated information packets from a plurality of M antennas over the wireless communication medium to the receiver.

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

modulating first and second groups of information packets;

applying up to M sets of M fixed phase offsets to the first and second group of modulated information packets wherein each modulated information packet in the first group is transmitted simultaneously from M antennas with a set of M fixed phase offsets, wherein each of the M sets of M fixed phase offsets provides substantially independent fading characteristics; and

applying M slow time varying phase offsets to the second group of modulated information packets; and

transmitting the phase offset, modulated first and second groups of information packets from a plurality of M antennas over the wireless communication medium to the receiver.

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

encoding the information packets with an error detection code for detecting errors in the information packets transmitted to the receiver;

modulating the error detection encoded information packets;

applying first and second sets of M fixed phase offsets to the modulated information packets for transmission of each modulated information packet simultaneously from M antennas with a set of M fixed phase offsets, wherein said second set of phase offsets is applied to the modulated information packets in response to a negative acknowledgement, wherein the first and second sets of M fixed phase offsets each provide substantially independent fading characteristics; and

transmitting the phase offset, modulated information packets from a plurality of M antennas over the wireless communication medium to the receiver.

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

encoding a first group of information packets with an error detection code for detecting errors in the information packets transmitted to the receiver;

modulating the error detection encoded first group of information packets;

modulating a second group of information packets;

applying first and second sets of M fixed phase offsets to the first group of modulated information packets for transmission of each modulated information packet in the first group simultaneously from M antennas with a set of M fixed phase offsets, wherein said second set of phase offsets is applied to the first group of modulated information packets in response to a negative acknowledgement, wherein the first and second sets of M fixed phase offsets each provide substantially independent fading characteristics; and

transmitting the phase offset, modulated first group of information packets and the modulated second group of information packets from a plurality of M antennas over the wireless communication medium to the receiver.