Method and apparatus for sharing signals on a single channel

• US 8,902,862 B2
• Filed: 08/15/2009
• Issued: 12/02/2014
• Est. Priority Date: 08/20/2008
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Yu, Zhi-Zhong, Agarwal, Mukund
• Primary Examiner(s): Yuen, Kan
• Application Number:
  US12/993,827
• Publication Number:
  US 20110122852A1
• Time in Patent Office: 1,935 Days
• Field of Search: 370203-208, 370328-338, 375260-265
• US Class Current: 370/336
• CPC Class Codes: H04B 17/318 Received signal strength
• CPC Class Codes: H04L 5/0007 the frequencies being orthogonal, e.g. OFDM(A), DMT
• CPC Class Codes: H04L 5/0023 Time-frequency-space
• CPC Class Codes: H04L 5/0044 allocation of payload
• CPC Class Codes: H04L 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver
• CPC Class Codes: H04L 5/005 of common pilots, i.e. pilots destined for multiple users or terminals
• CPC Class Codes: H04L 5/0091 Signaling for the administration of the divided path

Abstract

A method and apparatus for transmitting two signals on a single channel comprising a single frequency and a single time slot are disclosed. The method includes: generating a first training sequence from a first set of training sequences; generating a second training sequence from a second set of training sequences. The first and second training sequences have a low cross-correlation ratio with respect to each other; and the second set of training sequences is different from the first set of training sequences. First and second data are generated. The first data is combined with the first training sequence to produce first combined data and the second data is combined with the second training sequence to produce second combined data. The first and second combined data are transmitted on the single channel by a single transmitting apparatus.

Claims

1. A method of transmitting two signals on a single channel comprising a single frequency and a single time slot, the method comprising:

generating a first training sequence from a first set of training sequences, wherein a training sequence is a known sequence transmitted in a signal in a time slot burst;

generating a second training sequence from a second set of training sequences, the second training sequence being different from the first training sequence, the first and second training sequences having a low cross-correlation ratio with respect to each other; and

the second set of training sequences being different from the first set of training sequences;

generating first data;

generating second data;

combining the first data with the first training sequence to produce first combined data;

combining the second data with the second training sequence to produce second combined data; and

transmitting on the single channel by a single transmitting apparatus a first signal comprising the first combined data and a second signal comprising the second combined data, wherein the single transmitting apparatus is part of a base station;

the first and second signals are for respective first and second remote stations; and

the single base station serves the first and second remote stations.

2. A method according to claim 1, further comprising:

receiving a signal indicating that the second set of training sequences is supported by a remote station.

3. A method according to claim 1, further comprising:

transmitting a signal comprising a channel description indicating that the second set of training sequences is to be used by the remote station for a connection.

4. A method according to claim 3, wherein:

the channel description has a channel type field and a TDMA offset field;

the channel type field and TDMA offset field comprising;

5. A method according to claim 4, wherein each sequence of the first set of training sequences has a complementary sequence in the second set of training sequences which provides the lowest cross-correlation ratio with respect to the sequence of the first set of training sequences.

6. A method according to claim 5, wherein:

the first set of training sequences (TSC0 to TSC7) comprises;

00100 1011100001000100 10111 (TSC 0)

00101 1011101111000101 10111 (TSC 1)

01000 0111011101001000 01110 (TSC 2)

01000 1111011010001000 11110 (TSC 3)

00011 0101110010000011 01011 (TSC 4)

01001 1101011000001001 11010 (TSC 5)

10100 1111101100010100 11111 (TSC 6)

11101 1110001001011101 11100 (TSC 7);

and

the second set of training sequences comprises either;

01111 1100110101001111 11001 (TSC 0′

)

01100 1111110010101100 11111 (TSC 1′

)

01110 1101111010001110 11011 (TSC 2′

)

01101 1110100011101101 11101 (TSC 3′

)

11110 1101110001011110 11011 (TSC 4′

)

01010 1100111111001010 11001 (TSC 5′

)

01101 1100101000001101 11001 (TSC 6′

)

11100 1101010011111100 11010 (TSC 7′

)

or

01111 1100110101001111 11001 (TSC 0′

)

01101 1100010111101101 11000 (TSC 1′

)

00101 1110110111000101 11101 (TSC 2′

)

11110 1101110001011110 11011 (TSC 3′

)

01100 1111110010101100 11111 (TSC 4′

)

01010 0000110111001010 00001 (TSC 5′

)

01000 0101110001001000 01011 (TSC 6′

)

11100 1011111011111100 10111 (TSC 7′

).

7. A method according to claim 1, further comprising combining the first and second signals to produce a combined signal and transmitting the combined signal.

8. A method according to claim 1, wherein the second training sequence is used for signals transmitted by a remote station apparatus.

22. A non-transitory computer readable medium comprising instructions which when carried out by a computer perform the method of claim 1.

9. An apparatus for transmitting two signals on a single channel comprising a single frequency and a single time slot, the apparatus comprising:

means for generating a first training sequence from a first set of training sequences, wherein a training sequence is a known sequence transmitted in a signal in a time slot burst;

means for generating a second training sequence from a second set of training sequences, the means for generating first and second training sequences being configured to generate the first and second training sequences such that the second training sequence is different from the first training sequence, the first and second training sequences have low cross correlation ratio with respect to each other, and the second set of training sequences is different from the first set of training sequences;

means for generating first data;

means for generating second data;

means for combining the first data with the first training sequence to produce first combined data;

means for combining the second data with the second training sequence to produce second combined data;

means for transmitting on the single channel by a single transmitting apparatus a first signal comprising the first combined data and a second signal comprising the second combined data, wherein the apparatus is part of a single base station; and

the apparatus is configured to serve respective first and second remote stations and to transmit the first and second signals for the respective first and second remote stations.

10. An apparatus according to claim 9, the apparatus further comprising:

means for receiving a signal indicating that the second set of training sequences is supported by a remote station.

11. An apparatus according to claim 10, further comprising:

means for transmitting a signal comprising a channel description indicating that the second set of training sequence is to be used by the remote station for a connection.

12. An apparatus according to claim 11, the apparatus configured to transmit the signal so that the channel description has a channel type field and a TDMA offset field, the channel type field and the TDMA offset field comprising:

13. An apparatus according to claim 12, wherein the means for generating the first and second training sequences are configured to generate the first and second training sequences so that each sequence of the first set of training sequences has a complementary sequence of the second set of training sequences which provides the lowest cross-correlation ratio with respect to the sequence of the first set of training sequences.

14. An apparatus according to claim 13, wherein the means for generating the first and second training sequences are configured to generate the training sequences such that:

the first set of training sequences (TSC 0 to TSC 7) comprises;

00100 1011100001000100 10111 (TSC 0)

00101 1011101111000101 10111 (TSC 1)

01000 0111011101001000 01110 (TSC 2)

01000 1111011010001000 11110 (TSC 3)

00011 0101110010000011 01011 (TSC 4)

01001 1101011000001001 11010 (TSC 5)

10100 1111101100010100 11111 (TSC 6)

11101 1110001001011101 11100 (TSC 7);

and

the second set of training sequences comprises either;

01111 1100110101001111 11001 (TSC 0′

)

01100 1111110010101100 11111 (TSC 1′

)

01110 1101111010001110 11011 (TSC 2′

)

01101 1110100011101101 11101 (TSC 3′

)

11110 1101110001011110 11011 (TSC 4′

)

01010 1100111111001010 11001 (TSC 5′

)

01101 1100101000001101 11001 (TSC 6′

)

11100 1101010011111100 11010 (TSC 7′

)

or;

01111 1100110101001111 11001 (TSC 0′

)

01101 1100010111101101 11000 (TSC 1′

)

00101 1110110111000101 11101 (TSC 2′

)

11110 1101110001011110 11011 (TSC 3′

)

01100 1111110010101100 11111 (TSC 4′

)

01010 0000110111001010 00001 (TSC 5′

)

01000 0101110001001000 01011 (TSC 6′

)

11100 1011111011111100 10111 (TSC 7′

).

15. An apparatus according to claim 9, further comprising means for combining the first and second signals to produce a combined signal and wherein the means for transmitting is arranged to transmit the combined signal.

16. An apparatus according to claim 9, further comprising a receiver for receiving signals transmitted by a remote station, the signals comprising the second training sequence.

17. An apparatus, comprising:

a processor;

a memory in electronic communication with the processor; and

instructions stored in the memory, the instructions executable by the processor to;

generate a first training sequence of a first set of training sequences, wherein a training sequence is a known sequence transmitted in a signal in a time slot burst;

generate a second training sequence of a second or a third set of training sequences, the second training sequence different from the first training sequence, each of first and second training sequences having a low cross correlation ratio with respect to the other training sequence;

generate first data;

generate second data;

combine the first data with the first training sequence to produce first combined data;

combine the second data with the second training sequence to produce second combined data; and

transmit on a first channel comprising a single frequency and a single time slot, by a single transmitting apparatus, a first signal comprising the first combined data and a second signal comprising the second combined data, wherein the apparatus is part of a single base station; and

the apparatus is configured to serve respective first and second remote stations and to transmit the first and second signals for the respective first and second remote stations.

18. A remote station apparatus comprising:

means for generating a training sequence of a first or a second set of training sequences;

means for generating data;

means for combining the training sequence with the data to provide combined data;

means for transmitting on a single channel comprising a single frequency and a single time slot a signal comprising the combined data;

means for transmitting a capability signal indicating that both the first and second sets of training sequences are supported by the remote station;

means for receiving a signal comprising a channel description indicating that the second set of training sequences is to be used;

the means for generating the training sequence configured so that the generated training sequence is from the second set of training sequences depending on the channel description indication.

19. An apparatus for operating in a radio communications system, the apparatus comprising:

a data source for supplying a first and second data for transmission;

at least one sequence generator for generating a first training sequence and a second, different training sequence, wherein a training sequence is a known sequence transmitted in a signal of a time slot burst;

a combiner for combining the first training sequence with the first data to produce first combined data and for combining the second training sequence with the second data to produce second combined data; and

a transmitter for modulating and transmitting both the first and the second combined data using the same carrier frequency and the same time slot, wherein cross-correlation ratio between the first training sequence and the second, complementary new training sequence is very low, wherein the apparatus is part of a single base station; and

the apparatus is configured to serve respective first and second remote stations and to transmit the first and second signals for the respective first and second remote stations.

20. The apparatus as claimed in claim 19 wherein the first training sequence is complementary to the second training sequence.

21. The apparatus as claimed in claim 19 wherein said at least one sequence generator is a plurality of sequence generators.