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06/25/09 - USPTO Class 375 | 60 views | #20090161783 | Prev - Next | About this Page

Per stream rate control (psrc) for improving sysem efficiency in ofdm-mimo communication systems

Title: Per stream rate control (psrc) for improving sysem efficiency in ofdm-mimo communication systems

Brief Patent Description - Full Patent Description - Patent Claims

The Patent Description & Claims data below is from USPTO Patent Application 20090161783, Per stream rate control (psrc) for improving sysem efficiency in ofdm-mimo communication systems.

What is claimed is:

1. A wireless communications method comprising: separating a user data stream into a plurality of data sub-streams; determining channel conditions for each of a plurality of sub-carriers; selecting a modulation scheme and coding rate for each sub-carrier; modulating the sub carriers with the plurality of data sub-streams according to the selected modulation scheme and coding rate; allocating each modulated sub-carrier to a transmit antenna; and transmitting the data sub-streams.

2. The method of claim 1 wherein each sub-carrier has a separate transmission power.

3. The method of claim 2 wherein the separate transmission power of each sub-carrier is selectively adjusted prior to transmission.

4. The method of claim 1 wherein determining channel conditions is based on feedback information provided by a receiver.

5. The method of claim 1 wherein determining channel conditions is based on measuring predetermined quality metrics of received signals.

6. The method of claim 1 wherein selecting a modulation scheme utilizes an adaptive modulation and coding technique based on channel conditions.

7. The method of claim 1 wherein modulating the sub-carriers with the data sub-streams includes mapping a sub-stream to multiple sub-carriers.

8. The method of claim 1 wherein allocating each modulated sub-carrier to a transmit antenna is based on increasing the sub-carrier transmit quality.

9. The method of claim 1 wherein allocating each modulated sub carrier to a transmit antenna is based on a transmission quality and a throughput level.

10. The method of claim 1 further comprising: monitoring the modulation and coding rate, the sub carrier allocation, and power adjustment functions.

11. A transmitter comprising: a separation processor configured to separate a user data stream into a plurality of data sub-streams; a channel analyzer configured to determine channel conditions for each of a plurality of sub-carriers; a selector configured to select a modulation scheme and coding rate for each sub-carrier; a modulator configured to modulate the sub carriers with the plurality of data sub-streams according to the selected modulation scheme and coding rate; and an allocation processor configured to assign each modulated sub-carrier to an antenna for transmission.

12. The transmitter of claim 11, further comprising: a power controller configured to adjust a transmit power of each of the modulated sub-carriers.

13. The transmitter of claim 8, further comprising: a diversity processor configured to map sub-stream data to multiple sub-carriers based on channel condition information.

14. The transmitter of claim 11, wherein the channel analyzer is further configured to measure quality metrics of received signals to determine current channel conditions.

15. The transmitter of claim 11, wherein the channel analyzer is further configured to analyze feed back information to determine current channel conditions.

16. The transmitter of claim 12, further comprising a controller configured to control the selector, the allocation processor, and the power controller.

Brief Patent Description - Full Patent Description - Patent Claims

Click on the above for other options relating to this Per stream rate control (psrc) for improving sysem efficiency in ofdm-mimo communication systems patent application.

Patent Applications in related categories:

20090285314 - Adaptive frequency domain equalization in ofdm based communication system - An apparatus, system, and method of performing adaptive frequency domain equalization in an Orthogonal Frequency Domain Multiplexing (OFDM) based communication system transmitting data information, wherein the method comprises receiving OFDM symbols comprising scattered pilots; obtaining channel estimates on every third bin of the scattered pilots in a frequency domain, wherein ...

20090285315 - Apparatus and method for adaptive channel estimation and coherent bandwidth estimation apparatus thereof - An apparatus and a method for adaptive channel estimation and a coherent bandwidth estimation apparatus are provided. The adaptive channel estimation apparatus includes a first channel estimator, a coherent bandwidth estimator and a second channel estimator. The first channel estimator uses a predetermined approach to calculate a first channel response ...

20090285318 - Digital broadcast receiver and digital broadcast receiving apparatus - An FFT unit generates a frequency-domain signal for one-segment broadcasting and a frequency-domain signal for full-segment broadcasting. Under a good reception environment, the frequency-domain signal for the full-segment broadcasting is extracted by a switching control unit and the transmitted data for the full-segment broadcasting are recovered. When the reception environment ...

20090285319 - Efficient physical layer preamble format - A method for generating a preamble of a data unit for transmission via a communication channel includes generating a first field of the preamble using one of a first sequence or a second sequence, such that the first sequence and the second sequence are complementary sequences such that a sum ...

20090285317 - Methods and systems for effective channel estimation in ofdm systems - A method and apparatus for channel estimation in wireless communications are provided. After an initial channel estimation and an estimation of the effective channel length (ECL) are performed, a weighting based on the ECL may be applied in an effort to remove noise from the initial channel estimate and provide ...

20090285316 - Methods and systems for initial fch processing - Methods and apparatus for initially decoding a frame control header (FCH) in an orthogonal frequency-division multiplexing (OFDM) or orthogonal frequency division multiple access (OFDMA) system in an effort to accurately determine the downlink frame prefix (DLFP) such that the remainder of an OFDM/A frame may be properly decoded are provided. ...

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Previous Patent Application:
Overlay modulation technique for cofdm signals based on amplitude offsets
Next Patent Application:
System and method for frequency diversity
Industry Class:
Pulse or digital communications

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