Wireless transmission with channel state perturbation

• US 9,008,208 B2
• Filed: 05/13/2013
• Issued: 04/14/2015
• Est. Priority Date: 05/13/2012
• Status: Active Grant

• Current Assignee: Amir Keyvan Khandani
• Original Assignee: Amir Keyvan Khandani
• Inventors: Khandani, Amir Keyvan
• Primary Examiner(s): Vo, Don N
• Application Number:
  US13/893,296
• Publication Number:
  US 20130301747A1
• Time in Patent Office: 701 Days
• Field of Search: 375/267, 375/295, 375/299
• US Class Current: 375/267
• CPC Class Codes: H04B 1/123 using adaptive balancing or compensation means adaptive filter circuits and algorithms H03H
• CPC Class Codes: H04B 1/525 with means for reducing leakage of transmitter signal into the receiver
• CPC Class Codes: H04B 7/026 Co-operative diversity, e.g. using fixed or mobile stations as relays
• CPC Class Codes: H04B 7/0413 MIMO systems
• CPC Class Codes: H04B 7/0417 Feedback systems
• CPC Class Codes: H04B 7/0478 Special codebook structures directed to feedback optimisation
• CPC Class Codes: H04B 7/0626 Channel coefficients, e.g. channel state information [CSI]
• CPC Class Codes: H04B 7/0669 using different channel coding between antennas space-time coding H04L1/0618
• CPC Class Codes: H04B 7/10 Polarisation diversity; Directional diversity
• CPC Class Codes: H04L 1/18 Automatic repetition systems, e.g. Van Duuren systems
• CPC Class Codes: H04L 1/1825 Adaptation of specific ARQ protocol parameters according to transmission conditions
• CPC Class Codes: H04L 1/1896 ARQ related signaling
• CPC Class Codes: H04L 2001/0097 Relays
• CPC Class Codes: H04L 5/14 Two-way operation using the same type of signal, i.e. duplex
• CPC Class Codes: H04W 12/04 Key management, e.g. using generic bootstrapping architecture [GBA]
• CPC Class Codes: H04W 16/14 Spectrum sharing arrangements between different networks

Abstract

Generating a channel codebook by identifying a subset of antenna configurations from a plurality of antenna configurations of an antenna associated with a transmitter by: transmitting a sequence of symbols from the transmitter to a receiver using the plurality of antenna configurations, wherein each antenna configuration provides a unique transmission characteristic to the receiver; receiving feedback from the receiver that identifies the subset of antenna configurations; and, generating channel codebook entries corresponding to the subset of antenna configurations; and, transmitting data from the transmitter to the receiver using the channel codebook.

Claims

1. A method comprising:

generating a channel codebook by identifying a subset of antenna configurations from a plurality of antenna configurations of an antenna associated with a transmitter by;

transmitting a sequence of symbols from the transmitter to a receiver using the plurality of antenna configurations, wherein each antenna configuration provides a unique transmission characteristic to the receiver, and wherein the antenna configurations are generated by changing the propagation environment around the transmit antennas;

receiving feedback from the receiver that identifies the subset of antenna configurations; and

,

generating channel codebook entries corresponding to the subset of antenna configurations; and

,

transmitting data from the transmitter to the receiver by using the channel codebook to select a sequence of antenna configurations from the subset of antenna configurations based on the data to be transmitted, and transmitting symbols using the selected sequence of antenna configurations.

2. The method of claim 1 wherein the transmitted symbols are selected from a source codebook.

3. The method of claim 2 wherein the source codebook includes a plurality of constellation points.

4. The method of claim 2 wherein a selection of a source codeword from the source codebook is dependent on a selected channel codeword from the channel codebook.

5. The method of claim 2 wherein the source codebook includes codewords corresponding to constellation points arranged in a plurality of shells.

6. The method of claim 5 wherein constellation points within each shell of the plurality of shells is selected with equal probability.

7. The method of claim 5 wherein each shell of the plurality of shells is selected with different probabilities.

8. The method of claim 1 wherein the received feedback includes indices of the subset of antenna configurations.

9. The method of claim 1 wherein the feedback includes a scale factor for some of the antenna configurations in the subset to increase a transmit power when the corresponding antenna configuration is used.

10. The method of claim 1 wherein the feedback is received after each symbol of the sequence of symbols is transmitted.

11. The method of claim 1 wherein the propagation environment is changed through changing the radio frequency characteristics of near-by objects.

12. The method of claim 1, wherein the transmitted symbols are encoded using a source codebook to embed additional data in the RF signal prior to being transmitted from the transmit antenna.

13. The method of claim 12, wherein the source codebook includes selecting magnitude and signs of the in-phase and quadrature components to embed additional data.

14. An apparatus comprising:

a transmitter having a source codebook with a plurality of source codewords and a channel codebook with a plurality of channel codewords, wherein each channel codeword corresponds to a respective antenna configuration from a plurality of antenna configurations, the transmitter configured to use data bits to select a source codeword and to select a channel codeword;

at least one transmit antenna used by the transmitter; and

,

a plurality of reflectors positioned around the at least one transmit antenna wherein the reflectors are configured to be individually turned on or off according to the selected channel codeword to provide the plurality of antenna configurations.

15. The apparatus of claim 14 wherein each of the plurality of reflectors is of a type selected from the group consisting of a plasma, a semi-conductor with induced charges, a mechanically-positioned reflector, and a Micro-Electro-Mechanical system reflector.

16. The apparatus of claim 14 wherein the plurality of reflectors comprises M reflectors and the transmitter is configured to use an M-bit index number to configure the M reflectors.

17. The apparatus of claim 14 wherein the antenna is configured to have adjustable polarization to provide the plurality of antenna configurations.

18. A method comprising:

generating a channel codebook by identifying a subset of antenna configurations from a plurality of antenna configurations of an antenna associated with a transmitter by;

transmitting a sequence of symbols from the transmitter to a receiver using the plurality of antenna configurations, wherein each antenna configuration provides a unique transmission characteristic to the receiver;

receiving feedback from the receiver that identifies the subset of antenna configurations; and

,

generating channel codebook entries corresponding to the subset of antenna configurations; and

,

transmitting data from the transmitter to the receiver using the channel codebook;

wherein the antenna configurations are generated by changing the propagation environment around the transmit antennas, and wherein M reflectors are positioned around the transmit antenna and the M reflectors are individually turned on and off to provide 2^M antenna configurations.

19. The method of claim 18 wherein the antenna configurations are selected using an M-bit index number.

20. The method of claim 18 wherein the reflectors are of a type selected from the group consisting of a plasma, a semi-conductor with induced charges, a mechanically-positioned reflector, and a Micro-Electro-Mechanical system reflector.