SYMBOL MIXING ACROSS MULTIPLE PARALLEL CHANNELS

• US 20100080317A1
• Filed: 10/01/2009
• Published: 04/01/2010
• Est. Priority Date: 10/01/2008
• Status: Abandoned Application

• Current Assignee: Maxlinear Incorporated
• Original Assignee: Quantenna Communications, Inc. (ON Semiconductor Corporation)
• Inventors: Narasimhan, Ravi, Goldsmith, Andrea
• Application Number:
  US12/572,250
• Publication Number:
  US 20100080317A1
• Time in Patent Office: Days
• US Class Current: 375/267
• CPC Class Codes: H04B 7/0434 using multiple eigenmodes
• CPC Class Codes: H04B 7/0617 for beam forming
• CPC Class Codes: H04L 2025/03414 Multicarrier
• CPC Class Codes: H04L 2025/03426 transmission using multiple-input and multiple-output channels
• CPC Class Codes: H04L 25/0204 of multiple channels
• CPC Class Codes: H04L 5/0023 Time-frequency-space

Abstract

Symbol mixing across multiple input multiple output (MIMO) parallel channels is disclosed. Each data symbol is transmitted over an effective channel with a weighted sum of the singular values associated with all spatial channels. By averaging the singular values, there is less of a penalty associated with the choice of modulation and coding on the data symbols, since all transmitted symbols experience roughly the same signal to noise ratio (SNR) in transmission.

Claims

1. A system comprising:

a one-size-fits-all channel allocation engine;

a symbol mixing engine;

wherein, in operation,

the one-size-fits-all modulation and coding engine has data bits as input from an application and transforms the data bits into a data symbol vector X;

the symbol mixing engine has the data symbol vector X as input and transforms the data symbol vector X in accordance with bit priorities associated with the data bits into a transmit data symbol vector V for output to a multiple parallel channel (MPC) communication subsystem.

2. The system of claim 1, wherein the one-size-fits-all channel allocation engine includes a modulation and coding engine.

3. The system of claim 1, wherein the symbol mixing engine includes a bit prioritization engine that determines the bit priorities.

4. The system of claim 1, further comprising:

the MPC communication subsystem, wherein the MPC communication subsystem includes a multiple input multiple output (MIMO) wireless communication system.

5. The system of claim 1, further comprising:

the MPC communication subsystem, wherein the MPC communication subsystem includes an orthogonal frequency division multiplexing (OFDM) system.

6. The system of claim 1, further comprising:

the MPC communication subsystem, wherein the MPC communication subsystem includes a parallel cable system.

7. The system of claim 1, further comprising:

a channel estimation engine coupled to the MPC communication system, wherein, in operation, the channel estimation engine provides estimated channel parameters to the symbol mixing engine, and wherein the symbol mixing engine maps in accordance with channel estimation parameters.

8. The system of claim 1, further comprising:

a channel estimation engine coupled to the MPC communication system, wherein, in operation, the channel estimation engine provides estimated channel parameters to the one-size-fits-all channel allocation engine, and wherein the one-size-fits-all channel allocation engine maps in accordance with channel estimation parameters.

9. The system of claim 1, further comprising:

a symbol unmixing engine coupled to the symbol mixing engine, wherein, in operation, the symbol unmixing engine reverses the operation of the symbol mixing engine.

10. The system of claim 1, further comprising:

a one-size-fits-all channel deallocation engine coupled to the one-size-fits-all channel allocation engine, wherein, in operation, the one-size-fits-all channel deallocation engine reverses the operation of the one-size-fits-all channel allocation engine.

11. The system of claim 1, wherein the symbol mixing engine can be deactivated with respect to symbol mixing.

12. A system comprising:

a modulation and coding engine;

a symbol mixing engine coupled to the modulation and coding engine;

a spatial mapping and transmit beamforming engine coupled to the spatial mapping and transmit beamforming engine;

an antennae array coupled to the symbol mixing engine;

a channel estimation engine coupled to the symbol mixing engine;

wherein, in operation,

the modulation and coding engine transforms data bits from an application into a data symbol vector X;

the symbol mixing engine transforms the data symbol vector X into a vector of transmit symbols V in accordance with estimated channel parameters associated with the MIMO wireless channel, where each element of V is a function of a subset of elements of X;

the spatial mapping and transmit beamforming engine maps the vector of transmit symbols V onto the antennae array for transmission over a multiple input multiple output (MIMO) wireless channel;

the channel estimation engine provides the estimated channel parameters to the symbol mixing engine.

13. The system of claim 12, wherein the modulation and coding engine, the symbol mixing engine, the spatial mapping and transmit beamforming engine, and the antennae array are implemented in a wireless station.

14. The system of claim 12, wherein the antennae array includes a transmit (Tx) antennae array that, further comprising:

a receive (Rx) antennae array coupled to the Tx antennae array;

a spatial demapping and equalization engine coupled to the Rx antennae array;

a symbol unmixing engine coupled to the Rx array;

a demodulation and decoding engine coupled to the symbol demixing engine;

wherein, in operation, the Rx antennae array receives a vector of transmit symbols Y;

the spatial demapping and equalization engine removes noise introduced at least in part by the MIMO wireless channel and reverses the operation of the spatial mapping and transmit beamforming engine to derive the vector of transmit symbols V from the vector of transmit symbols Y;

the symbol demixing engine reverses the operation of the symbol mixing engine to derive the vector of transmit symbols X from the vector of transmit symbols V;

the demodulation and decoding engine reverses the operation of the modulation and coding engine to derive the data bits from the data symbol vector X.

15. The system of claim 14, wherein the spatial demapping and equalization engine provides feedback associated with the MIMO wireless channel to the channel estimator.

16. The system of claim 14, wherein the Rx antennae array, the spatial demapping and equalization engine, the symbol unmixing engine, and the demodulation and decoding engine are implemented in a wireless station.

17. The system of claim 12, further comprising a bit prioritization engine coupled to the symbol mixing engine, wherein, in operation, the bit prioritization engine provides the symbol mixing engine data sufficient to transform the data symbol vector X in accordance with a data bit prioritization scheme.

19. The method of claim 17, wherein the data bits are first data bits, further comprising:

transforming second data bits from an application into an unmixed transmit data symbol vector;

transmitting the unmixed transmit data symbol vector onto the MPC communication subsystem.

20. The method of claim 17, further comprising:

at a receiver, removing noise introduced at least in part by channels of the MPC communication subsystem;

unmixing symbols of the data symbol vector;

deriving the data bits from the symbols.

18. A method comprising:

transforming data bits from an application into a data symbol vector;

mixing symbols of the data symbol vector into a transmit data symbol vector for output to a multiple parallel channel (MPC) communication subsystem in accordance with bit priorities associated with the data bits and estimated channel parameters associated with channels of the MPC communication subsystem;

transmitting the transmit data symbol vector onto the MPC communication subsystem.