Patent 7949068

Prior art

Earlier patents, publications, and products that may anticipate or render the claims unpatentable.

Active provider: Google · gemini-2.5-flash

Prior art

Earlier patents, publications, and products that may anticipate or render the claims unpatentable.

✓ Generated

To identify the most relevant prior art for US patent 7949068, I have reviewed the patent citations listed within the document itself. For each reference, I will provide the full citation, publication/priority date, a brief description, and an assessment of which claim(s) it potentially anticipates under 35 U.S.C. § 102.

The independent claims of US7949068 are:

  • Claim 1 (System): A transmit processor generates extension data streams from base data streams via matrix multiplication with a unitary matrix. This processor is coupled to base antennas for base streams and expansion antennas for extension streams.
  • Claim 9 (System - Means-Plus-Function): Uses "means for" language similar to Claim 1.
  • Claim 17 (Method): A method of generating extension data streams from base data streams via matrix multiplication with a unitary matrix, and transmitting all streams from separate corresponding antennas.

A critical consideration for anticipation under 35 U.S.C. § 102 is the priority date of the cited art relative to the patent being analyzed. US7949068 has a priority date of April 26, 2005. Any reference with a priority date after this date cannot serve as anticipatory prior art.

Prior Art Analysis for US7949068

Here are the patent citations and their analysis:

  1. US6590889B1

    • Full Citation: US6590889B1, "Data communications system and hybrid time-code multiplexing method," issued July 8, 2003.
    • Publication/Priority Date: Priority Date: August 11, 1997. Publication Date: July 8, 2003.
    • Brief Description: This patent describes a data communications system and a hybrid time-code multiplexing method.
    • Potential Anticipation (35 U.S.C. § 102): Based solely on the title, this patent's focus on "time-code multiplexing" does not explicitly disclose the generation of extension data streams from base data streams using matrix multiplication with a unitary matrix and their transmission from dedicated base and extension antennas as defined in Claims 1, 9, and 17 of US7949068. Without further detail from its claims or specification, direct anticipation is not clearly established.

  2. US6377632B1

    • Full Citation: US6377632B1, "Wireless communication system and method using stochastic space-time/frequency division multiplexing," issued April 23, 2002.
    • Publication/Priority Date: Priority Date: January 24, 2000. Publication Date: April 23, 2002.
    • Brief Description: This patent describes a wireless communication system and method employing stochastic space-time/frequency division multiplexing.
    • Potential Anticipation (35 U.S.C. § 102): While broadly related to multi-antenna systems, the term "stochastic space-time/frequency division multiplexing" in the title does not explicitly teach the specific mechanism of generating "extension data streams" through "matrix multiplication with a unitary matrix" as required by Claims 1, 9, and 17 of US7949068.

  3. US6801579B1

    • Full Citation: US6801579B1, "Method and wireless communication using unitary space-time signal constellations," issued October 5, 2004.
    • Publication/Priority Date: Priority Date: March 9, 2000. Publication Date: October 5, 2004.
    • Brief Description: This patent describes a method and apparatus for wireless communication that uses unitary space-time signal constellations to improve the data integrity of a communication link.
    • Potential Anticipation (35 U.S.C. § 102): This patent is highly relevant. The explicit mention of "unitary space-time signal constellations" directly addresses the "unitary matrix" aspect of US7949068's independent claims (Claims 1, 9, and 17). Space-time signal constellations often involve processing data streams across multiple antennas. If this patent teaches generating multiple signals (which could be considered extension data streams) from input data streams using a unitary matrix for transmission from separate antennas, it could potentially anticipate all independent claims of US7949068.

  4. US7099269B2

    • Full Citation: US7099269B2, "Methods and apparatus for generating and utilizing training codes in a space division multiplexing communication system," issued August 29, 2006.
    • Publication/Priority Date: Priority Date: November 13, 2000. Publication Date: August 29, 2006.
    • Brief Description: This patent pertains to methods and apparatus for generating and utilizing training codes within a space division multiplexing (SDM) communication system.
    • Potential Anticipation (35 U.S.C. § 102): While related to multi-antenna (SDM) systems, the primary focus on "training codes" does not directly align with the core inventive concept of US7949068, which is the generation of "extension data streams" via "unitary matrix multiplication" for diversity expansion. Therefore, it is less likely to anticipate Claims 1, 9, or 17.

  5. US20030076891A1

    • Full Citation: US20030076891A1, "Method and apparatus for transmitting/receiving signals in multiple-input multiple-output communication system provided with plurality of antenna elements," published April 24, 2003.
    • Publication/Priority Date: Priority Date: October 19, 2001. Publication Date: April 24, 2003.
    • Brief Description: This publication describes a method and apparatus for transmitting and receiving signals in a multiple-input multiple-output (MIMO) communication system utilizing a plurality of antenna elements.
    • Potential Anticipation (35 U.S.C. § 102): This is a general MIMO system description. While it covers the broad concept of using multiple antennas, the title does not specify the unique features of US7949068, such as the generation of "extension data streams" through "matrix multiplication with a unitary matrix" from "base data streams" and their specific allocation to "base" and "extension" antennas for diversity expansion.

  6. US7356090B2

    • Full Citation: US7356090B2, "Transmission/reception apparatus for a wireless communication system with three transmission antennas," issued April 8, 2008.
    • Publication/Priority Date: Priority Date: January 2, 2003. Publication Date: April 8, 2008.
    • Brief Description: This patent describes a transmission/reception apparatus for a wireless communication system that employs three transmission antennas.
    • Potential Anticipation (35 U.S.C. § 102): This patent describes a system with three transmit antennas, which is a specific instance of a multi-antenna system. Whether it anticipates US7949068 depends on the detailed functionality of how it generates and transmits signals from these antennas. If it discloses the specific "matrix multiplication with a unitary matrix" to create "extension data streams" from "base data streams" for diversity expansion across dedicated base and extension antennas, it could anticipate Claims 1, 9, and 17.

  7. US7430244B2

    • Full Citation: US7430244B2, "Constellation-rotating orthogonal space-time block coding technique," issued September 30, 2008.
    • Publication/Priority Date: Priority Date: December 24, 2003. Publication Date: September 30, 2008.
    • Brief Description: This patent describes a constellation-rotating orthogonal space-time block coding (STBC) technique.
    • Potential Anticipation (35 U.S.C. § 102): Space-Time Block Coding (STBC) is a well-known method for achieving transmit diversity using multiple antennas, and often employs orthogonal matrices (a subset of unitary matrices). While US7949068 notes a disadvantage of STBC (receiver awareness), the underlying principles of generating multiple streams for transmission using matrix operations (e.g., orthogonal/unitary matrices) are very similar. Therefore, this patent could anticipate the aspects of Claims 1, 9, and 17 related to "matrix multiplication with a unitary matrix" and transmission from separate antennas for diversity.

  8. US7436903B2

    • Full Citation: US7436903B2, "Multicarrier transmitter and method for transmitting multiple data streams with cyclic delay diversity," issued October 14, 2008.
    • Publication/Priority Date: Priority Date: September 29, 2004. Publication Date: October 14, 2008.
    • Brief Description: This patent describes a multicarrier transmitter and method for transmitting multiple data streams using cyclic delay diversity. In one embodiment, it comprises an input to receive multiple data streams, a cyclic delay module to apply a cyclic delay to at least one of the data streams, and multiple antennas to transmit the streams.
    • Potential Anticipation (35 U.S.C. § 102): This patent is extremely relevant. It explicitly describes "cyclic delay diversity" for "transmitting multiple data streams" via "multiple antennas," which is a core mechanism taught in US7949068 for diversity expansion. The presence of a "cyclic delay module" directly addresses the "cyclically-shifted" aspects mentioned in dependent claims and the overall concept. If this patent also incorporates combining multiple streams into new streams (implicitly through diversity techniques) and transmitting them from different antennas, it strongly anticipates Claims 1, 9, and 17, particularly the cyclic shift components.

  9. US7539463B2

    • Full Citation: US7539463B2, "Techniques to enhance diversity for a wireless system," issued May 26, 2009.
    • Publication/Priority Date: Priority Date: March 30, 2005. Publication Date: May 26, 2009.
    • Brief Description: This patent discloses techniques to enhance diversity in a wireless system, which may include applying one or more time delays, one or more cyclic shifts, or a combination of both to one or more data streams, and then transmitting these data streams from two or more antennas.
    • Potential Anticipation (35 U.S.C. § 102): This patent is highly relevant due to its direct mention of "cyclic shifts" and "time delays" applied to data streams for "diversity enhancement" and transmission from "two or more antennas." This directly corresponds to the fundamental approach of US7949068. While the abstract does not explicitly state "matrix multiplication with a unitary matrix," the application of cyclic shifts and combining (implied in diversity enhancement) for transmission over multiple antennas strongly suggests anticipation of the core elements of Claims 1, 9, and 17. Its priority date is very close to that of US7949068, making it a highly pertinent prior art reference.

  10. US20070274411A1

    • Full Citation: US20070274411A1, "Signal generation using phase-shift based pre-coding," published November 29, 2007.
    • Publication/Priority Date: Priority Date: May 26, 2006. Publication Date: November 29, 2007.
    • Brief Description: This publication describes signal generation using phase-shift based pre-coding.
    • Potential Anticipation (35 U.S.C. § 102): While "phase-shift based pre-coding" could be highly relevant to the technical aspects of US7949068, this publication has a priority date of May 26, 2006, which is after the priority date of US7949068 (April 26, 2005). Therefore, US20070274411A1 cannot serve as anticipatory prior art under 35 U.S.C. § 102 for US7949068. It may have been cited for other reasons, such as providing context as related art.

Generated 5/25/2026, 6:47:06 PM