STBC with multiple streams in OFDM for WLAN and error metrics for soft decision with channel information

US 20050281348A1
Filed: 09/30/2004
Published: 12/22/2005
Est. Priority Date: 06/16/2004
Status: Active Grant

First Claim

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1. A method of receiving data over M receiving antennas from N transmitting antennas, where M and N are integers, the method comprising the steps of:

receiving M signals over the M receiving antennas;

applying the M signals to a space/time decoder;

determining noise powers for M channels, with the M channels being based on the M signals;

applying Viterbi filtering to the M channels utilizing the noise powers; and

deriving received data from the filtered M channels.

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Abstract

A method of receiving data over M receiving antennas from N transmitting antennas, where M and N are integers, includes the steps of receiving M signals over the M receiving antennas, applying the M signals to a space/time decoder, determining noise powers for M channels, with the M channels being based on the M signals, applying Viterbi filtering to the M channels utilizing the noise powers and deriving received data from the filtered M channels.

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26 Claims

1. A method of receiving data over M receiving antennas from N transmitting antennas, where M and N are integers, the method comprising the steps of:
- receiving M signals over the M receiving antennas;
  
  applying the M signals to a space/time decoder;
  
  determining noise powers for M channels, with the M channels being based on the M signals;
  
  applying Viterbi filtering to the M channels utilizing the noise powers; and
  
  deriving received data from the filtered M channels.
- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
- - 2. A method according to claim 1, wherein the step of determining noise powers further comprises removing interference terms between the M channels.
  - 3. A method according to claim 1, wherein the step of determining noise powers comprises zero-forcing terms equivalent to relationships between signals sent from the N transmitting antennas to the M receiving antennas to determine channel information.
  - 4. A method according to claim 3, wherein the relationships comprise:
    - $\begin{matrix} \begin{matrix} [\begin{matrix} r_{1} \\ r_{2} \end{matrix}] = [\begin{matrix} H_{1} & G_{1} \\ H_{2} & G_{2} \end{matrix}] [\begin{matrix} c_{1} \\ c_{2} \end{matrix}] + [\begin{matrix} n_{1} \\ n_{2} \end{matrix}] & where, \end{matrix} \\ \begin{matrix} c_{1} = [\begin{matrix} c_{11} \\ c_{12} \end{matrix}], & c_{2} = [\begin{matrix} c_{21} \\ c_{22} \end{matrix}], & r_{1} = [\begin{matrix} r_{1} (t_{1}) \\ r_{1}^{*} (t_{2}) \end{matrix}], & r_{2} = [\begin{matrix} r_{2} (t_{1}) \\ r_{2}^{*} (t_{2}) \end{matrix}], \end{matrix} \\ \begin{matrix} H_{i} = [\begin{matrix} h_{1 i} & h_{2 i} \\ h_{2 i}^{*} & - h_{1 i}^{*} \end{matrix}], & G_{i} = [\begin{matrix} h_{3 i} & h_{4 i} \\ h_{4 i}^{*} & - h_{3 i}^{*} \end{matrix}] \end{matrix} \end{matrix}$ and the channel information of each STBC symbol after crosstalk cancellation, Ni, comprises;
      
      $\begin{matrix} \begin{matrix} E ([\begin{matrix} N_{1} \\ N_{2} \end{matrix}] [\begin{matrix} N_{1}^{*} & N_{2}^{*} \end{matrix}]) = \\ [\begin{matrix} {\tilde{H}}^{*} (I + \hat{G}) \tilde{H} & - {\tilde{H}}^{*} ({(H_{2} H_{1}^{- 1})}^{*} + G_{1} G_{2}^{- 1}) \tilde{H} \\ {\tilde{G}}^{*} (H_{1} H_{1}^{- 1} + {(G_{1} G_{2}^{- 1})}^{*}) \tilde{H} & {\tilde{G}}^{*} (I + \hat{H}) \tilde{G} \end{matrix}] \end{matrix} \\ \begin{matrix} where, \hat{G} = {G_{1} (G_{2}^{*} G_{2})}^{- 1} G_{1}^{*}, & \hat{H} = {H_{2} (H_{1}^{*} H_{1})}^{- 1} H_{2}^{*} . \end{matrix} \end{matrix}$
  - 5. A method according to claim 4, wherein when M is greater than N, the channel information can be written as sums of weighted scalar values.
  - 6. A method according to claim 1, wherein the step of receiving M signals comprises receiving the M signals that have been coded through space-time block-coding.
  - 7. A method according to claim 1, wherein the step of applying Viterbi filtering to the M channels comprises applying soft decision Viterbi filtering to the M channels.
  - 8. A method according to claim 1, further comprising utilizing the noise powers in decoding of the M channels, wherein the decoding is performed according to one of turbo coding and low density parity check block coding.
  - 9. A method according to claim 1, further comprising at least one of band pass filtering of the M received signals, analog-to-digital converting of the M received signals, fast Fourier transforming the M Viterbi filtered channels and multiplexing the M Viterbi filtered channels.

10. A receiver for receiving data over M receiving antennas transmitted from N transmitting antennas, where M and N are integers, the receiver comprising:
- receiving means for receiving M signals over the M receiving antennas;
  
  applying means for applying the M signals to a space/time decoder;
  
  determining means for determining noise powers for M channels, with the M channels being based on the M signals;
  
  filtering means for applying Viterbi filtering to the M channels utilizing the noise powers; and
  
  deriving means for deriving received data from the filtered M channels.
- View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
- - 11. A receiver according to claim 10, wherein the determining means further comprises interference removing means for removing interference terms between the M channels.
  - 12. A receiver according to claim 10, wherein the determining means comprises zero-forcing means for zero-forcing terms equivalent to relationships between signals sent from the N transmitting antennas to the M receiving antennas to determine channel information.
  - 13. A receiver according to claim 12, wherein the relationships comprise:
    - $\begin{matrix} \begin{matrix} [\begin{matrix} r_{1} \\ r_{2} \end{matrix}] = [\begin{matrix} H_{1} & G_{1} \\ H_{2} & G_{2} \end{matrix}] [\begin{matrix} c_{1} \\ c_{2} \end{matrix}] + [\begin{matrix} n_{1} \\ n_{2} \end{matrix}] & where, \end{matrix} \\ \begin{matrix} c_{1} = [\begin{matrix} c_{11} \\ c_{12} \end{matrix}], & c_{2} = [\begin{matrix} c_{21} \\ c_{22} \end{matrix}], & r_{1} = [\begin{matrix} r_{1} (t_{1}) \\ r_{1}^{*} (t_{2}) \end{matrix}], & r_{2} = [\begin{matrix} r_{2} (t_{1}) \\ r_{2}^{*} (t_{2}) \end{matrix}], \end{matrix} \\ \begin{matrix} H_{i} = [\begin{matrix} h_{1 i} & h_{2 i} \\ h_{2 i}^{*} & - h_{1 i}^{*} \end{matrix}], & G_{i} = [\begin{matrix} h_{3 i} & h_{4 i} \\ h_{4 i}^{*} & - h_{3 i}^{*} \end{matrix}] \end{matrix} \end{matrix}$ and the channel information of each STBC symbol after crosstalk cancellation, Ni, comprises;
      
      $E ([\begin{matrix} N_{1} \\ N_{2} \end{matrix}] [N_{1}^{*} N_{2}^{*}]) = [\begin{matrix} {\tilde{H}}^{*} (I + \hat{G}) \tilde{H} & - \tilde{H^{*}} ({(H_{2} H_{1}^{- 1})}^{*} + G_{1} G_{2}^{- 1}) \tilde{H} \\ \tilde{G^{*}} (H_{1} H_{1}^{- 1} + {(G_{1} G_{2}^{- 1})}^{*}) \tilde{H} & \tilde{G^{*}} (I + \hat{H}) \tilde{G} \end{matrix}]$ $where, \hat{G} = {G_{1} (G_{2}^{*} G_{2})}^{- 1} G_{1}^{*}, \hat{H} = {H_{2} (H_{1}^{*} H_{1})}^{- 1} H_{2}^{*} .$
  - 14. A receiver according to claim 13, wherein when M is greater than N, the channel information can be written as sums of weighted scalar values.
  - 15. A receiver according to claim 10, wherein the receiving means comprises receiving means for receiving the M signals that have been coded through space-time block-coding.
  - 16. A receiver according to claim 10, wherein the applying means comprises applying means for applying soft decision Viterbi filtering to the M channels.
  - 17. A receiver according to claim 10, further comprising utilizing means for utilizing the noise powers in decoding of the M channels, wherein the decoding is performed according to one of turbo coding and low density parity check block coding.
  - 18. A receiver according to claim 10, further comprising at least one of band pass filtering means for filtering of the M received signals, analog-to-digital converting means for analog-to-digital converting of the M received signals, fast Fourier transforming means for fast Fourier transforming the M Viterbi filtered channels and multiplexing means for multiplexing the M Viterbi filtered channels.

19. A receiver for receiving data over M receiving antennas transmitted from N transmitting antennas, where M and N are integers, the receiver comprising:
- M receiving antennas, configured to receive M signals;
  
  a space/time decoder, configured to receive the M signals and supply M channels being based on the M signals; and
  
  a multiplexer, configured to provide received data from the M channels;
  
  wherein the space/time decoder is configured to determine noise powers for M channels and to apply Viterbi filtering to the M channels utilizing the noise powers.
- View Dependent Claims (20, 21, 22, 23, 24, 25, 26)
- - 20. A receiver according to claim 19, wherein the space/time decoder is configured to remove interference terms between the M channels.
  - 21. A receiver according to claim 19, wherein the space/time decoder is configured to zero-force terms equivalent to relationships between signals sent from the N transmitting antennas to the M receiving antennas to determine channel information.
  - 22. A receiver according to claim 21, wherein the relationships comprise:
    - $[\begin{matrix} r_{1} \\ r_{2} \end{matrix}] = [\begin{matrix} H_{1} & G_{1} \\ H_{2} & G_{2} \end{matrix}] [\begin{matrix} c_{1} \\ c_{2} \end{matrix}] + [\begin{matrix} n_{1} \\ n_{2} \end{matrix}] where, c_{1} = [\begin{matrix} c_{11} \\ c_{12} \end{matrix}], c_{2} = [\begin{matrix} c_{21} \\ c_{22} \end{matrix}], r_{1} = [\begin{matrix} r_{1} (t_{1}) \\ r_{1}^{*} (t_{2}) \end{matrix}], r_{2} = [\begin{matrix} r_{2} (t_{1}) \\ r_{2}^{*} (t_{2}) \end{matrix}], H_{i} = [\begin{matrix} h_{1 i} & h_{2 i} \\ h_{2 i}^{*} & - h_{1 i}^{*} \end{matrix}], G_{i} = [\begin{matrix} h_{3 i} & h_{4 i} \\ h_{4 i}^{*} & - h_{3 i}^{*} \end{matrix}]$ and the channel information of each STBC symbol after crosstalk cancellation, Ni, comprises;
      
      $E ([\begin{matrix} N_{1} \\ N_{2} \end{matrix}] [N_{1}^{*} N_{2}^{*}]) = [\begin{matrix} {\tilde{H}}^{*} (I + \hat{G}) \tilde{H} & - \tilde{H^{*}} ({(H_{2} H_{1}^{- 1})}^{*} + G_{1} G_{2}^{- 1}) \tilde{H} \\ \tilde{G^{*}} (H_{1} H_{1}^{- 1} + {(G_{1} G_{2}^{- 1})}^{*}) \tilde{H} & \tilde{G^{*}} (I + \hat{H}) \tilde{G} \end{matrix}]$ $where, \hat{G} = {G_{1} (G_{2}^{*} G_{2})}^{- 1} G_{1}^{*}, \hat{H} = {H_{2} (H_{1}^{*} H_{1})}^{- 1} H_{2}^{*} .$
  - 23. A receiver according to claim 22, wherein when M is greater than N, the channel information can be written as sums of weighted scalar values.
  - 24. A receiver according to claim 19, wherein the space/time decoder is configured to apply soft decision Viterbi filtering to the M channels.
  - 25. A method according to claim 19, wherein the space/time decoder is configured to utilize the noise powers in decoding of the M channels, wherein the decoding is configured to perform according to one of turbo coding and low density parity check block coding.
  - 26. A method according to claim 19, further comprising at least one of a band pass filter, an analog-to-digital converter, a fast Fourier transformer and a multiplexer.

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Current Assignee
Avago Technologies International Sales Pte Limited (Broadcom, Inc.)
Original Assignee
Broadcom Corporation (Broadcom, Inc.)
Inventors
Kim, Joonsuk

Granted Patent

US 7,519,126 B2
Time in Patent Office

Days
Field of Search
US Class Current

375/267
CPC Class Codes

H04L 1/0643 block codes

H04L 27/2647 Arrangements specific to th...

STBC with multiple streams in OFDM for WLAN and error metrics for soft decision with channel information

First Claim

6 Assignments

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Abstract

Citations

26 Claims

Specification

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STBC with multiple streams in OFDM for WLAN and error metrics for soft decision with channel information

First Claim

6 Assignments

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0 Petitions

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Accused Products

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Abstract

Citations

26 Claims

Specification

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Solutions

Use Cases

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