Prior art — US Patent 7529305

To identify the most relevant prior art for US patent 7529305, I will analyze the patent citations listed within the patent text itself. The core distinguishing features of US7529305's independent claims (Claims 1 and 8) include:

Processing M symbol substreams.
A space-time coding function that produces M space-time coded symbols.
Each input symbol from the M substreams being represented in all M space-time coded streams.
A delay arrangement/function ensuring that the representation of each input symbol in the M space-time coded streams occurs at different times for each of the M streams.
Transmission of these M space-time coded streams on M respective antennas.

The crucial aspect for anticipation under 35 U.S.C. § 102 will be whether the prior art discloses this specific combination of full diversity (each input symbol appearing in all output streams) with time diversity introduced by delays across the output streams for those representations.

Here are the patent citations for US7529305 and an analysis of their potential anticipation:

Prior Art Citations for US7529305:

US6377631B1
- Full Citation: US6377631B1 to Cisco Systems, Inc.
- Publication/Filing Date: Priority Date: 1996-08-29; Publication Date: 2002-04-23
- Brief Description: This patent describes a transmitter that incorporates spatio-temporal processing for transmitting data streams using multiple antennas. It focuses on applying a processing matrix to data streams before transmission through multiple antennas to improve signal quality and capacity in wireless communication systems.
- Potential Anticipation (35 U.S.C. § 102): US6377631B1 describes spatio-temporal processing and the use of a processing matrix with multiple antennas, which aligns with the general concept of space-time coding and spatial multiplexing. However, based on the title and general description, it is not immediately clear if it explicitly teaches the critical "delay arrangement" that ensures each input symbol is represented in all output streams at different times, which is a distinguishing feature of claims 1 and 8 of US7529305. Without further analysis of its claims and detailed description, it's difficult to definitively state anticipation of this specific aspect. However, it generally anticipates the broad concept of multi-antenna space-time processing.
  - Claims potentially anticipated: Broad concepts related to space-time coding and spatial multiplexing in multi-antenna systems.
EP0905920A2
- Full Citation: EP0905920A2 to Lucent Technologies Inc.
- Publication/Filing Date: Priority Date: 1997-09-26; Publication Date: 1999-03-31
- Brief Description: This patent describes a multiple antenna communication system and method thereof, particularly for space-time coding to achieve diversity and coding gain in wireless communication.
- Potential Anticipation (35 U.S.C. § 102): Similar to US6377631B1, this patent covers the general field of multiple antenna systems and space-time coding for diversity. It is a general prior art reference for space-time coding. To anticipate claims 1 and 8 of US7529305, it would need to explicitly disclose the representation of each input symbol across all space-time coded streams at different times through a delay mechanism. This specific combination is not evident from the title.
  - Claims potentially anticipated: Broad concepts related to space-time coding and spatial diversity.
US6351498B1
- Full Citation: US6351498B1 to NTT Mobile Communications Network Inc.
- Publication/Filing Date: Priority Date: 1997-11-20; Publication Date: 2002-02-26
- Brief Description: This patent describes a robust digital modulation and demodulation scheme for radio communications involving fading, which includes methods for transmit diversity over multiple antennas.
- Potential Anticipation (35 U.S.C. § 102): This patent addresses robust digital modulation and transmit diversity. While it deals with transmit diversity, it doesn't immediately suggest the unique delay-based distribution of individual input symbols across all output streams at different times as claimed in US7529305.
  - Claims potentially anticipated: General transmit diversity schemes in fading channels.
US6678263B1
- Full Citation: US6678263B1 to Hughes Electronics Corporation.
- Publication/Filing Date: Priority Date: 1998-09-18; Publication Date: 2004-01-13
- Brief Description: This patent describes methods and constructions for space-time codes for PSK constellations for spatial diversity in multiple-element antenna systems.
- Potential Anticipation (35 U.S.C. § 102): This patent directly addresses space-time codes for spatial diversity, which is a closer match to the subject matter of US7529305. If this patent teaches the construction of space-time codes where each input symbol contributes to all output streams and is delayed differently across these streams, it could potentially anticipate claims 1 and 8. The term "space-time codes" is broad, and without reviewing the detailed claims of US6678263B1, it's hard to be conclusive. Many space-time block codes transmit symbols simultaneously or with simple permutations, not necessarily with the explicit time-offset representation of each input symbol across all transmit streams as highlighted in US7529305.
  - Claims potentially anticipated: Space-time coding, spatial diversity.
EP0993130A2
- Full Citation: EP0993130A2 to Texas Instruments Incorporated.
- Publication/Filing Date: Priority Date: 1998-10-07; Publication Date: 2000-04-12
- Brief Description: This patent describes space-time block coded transmit antenna diversity for WCDMA systems.
- Potential Anticipation (35 U.S.C. § 102): This patent explicitly mentions "space-time block coded transmit antenna diversity." Space-time block codes (STBCs) are a well-known form of space-time coding that achieve diversity. The Alamouti code, a popular STBC, distributes symbols across antennas and time slots. If this patent details an STBC that ensures each individual input symbol is represented across all M transmit antennas and, specifically, at different transmission times in a delayed fashion as described in US7529305, it would be highly relevant and potentially anticipatory for claims 1 and 8.
  - Claims potentially anticipated: Space-time coding, transmit antenna diversity, potentially claims 1 and 8 if it discloses the specific delay mechanism for individual input symbols across all streams.
US6775260B1
- Full Citation: US6775260B1 to Texas Instruments Incorporated.
- Publication/Filing Date: Priority Date: 1999-02-25; Publication Date: 2004-08-10
- Brief Description: This patent describes space time transmit diversity for TDD/WCDMA systems.
- Potential Anticipation (35 U.S.C. § 102): Similar to EP0993130A2, this patent focuses on space-time transmit diversity for WCDMA. The relevance here depends on whether the specific diversity scheme employed in US6775260B1 incorporates the staggered, time-delayed representation of each input symbol across all transmit streams as a feature. This is a common area of research, and the precise implementation details would determine anticipation.
  - Claims potentially anticipated: Space-time transmit diversity schemes.
US7215718B1
- Full Citation: US7215718B1 to AT&T Corp.
- Publication/Filing Date: Priority Date: 1999-04-28; Publication Date: 2007-05-08
- Brief Description: This patent describes a combined channel coding and space-time block coding in a multi-antenna arrangement.
- Potential Anticipation (35 U.S.C. § 102): The combination of channel coding and space-time block coding is a significant aspect. If this patent's space-time block coding scheme involves distributing each input symbol across all transmit antennas with differing delays, it would directly anticipate the core elements of claims 1 and 8 of US7529305.
  - Claims potentially anticipated: Space-time block coding, combined channel coding, potentially claims 1 and 8 if the specific delay aspect for individual symbols is present.
US6891897B1
- Full Citation: US6891897B1 to Nortel Networks Limited.
- Publication/Filing Date: Priority Date: 1999-07-23; Publication Date: 2005-05-10
- Brief Description: This patent describes a space-time coding and channel estimation scheme, arrangement, and method.
- Potential Anticipation (35 U.S.C. § 102): This patent, also from Nortel Networks (the original assignee of US7529305), focuses on space-time coding and channel estimation. Given the shared assignee, there might be conceptual overlap or a foundational relationship. The key here is whether this "space-time coding scheme" incorporates the specific delay mechanisms for individual symbols across multiple output streams, leading to their representation at different times on different antennas. If it does, it would be a strong anticipatory reference for claims 1 and 8.
  - Claims potentially anticipated: Space-time coding, channel estimation, and potentially claims 1 and 8 if the specific delay-based full diversity is taught.
US6473467B1
- Full Citation: US6473467B1 to Qualcomm Incorporated.
- Publication/Filing Date: Priority Date: 2000-03-22; Publication Date: 2002-10-29
- Brief Description: This patent describes a method and apparatus for measuring and reporting channel state information in a high-efficiency, high-performance communications system. It relates to feedback mechanisms in MIMO systems.
- Potential Anticipation (35 U.S.C. § 102): This patent primarily concerns channel state information (CSI) measurement and reporting, which is a different focus from the space-time coding and multiplexing scheme itself. While relevant to MIMO systems, it is unlikely to anticipate the specific encoding and transmission structure of US7529305's claims 1 and 8.
  - Claims potentially anticipated: Not directly anticipatory of claims 1 or 8, as its focus is on channel estimation feedback.
US7010029B1
- Full Citation: US7010029B1 to AT&T Corp.
- Publication/Filing Date: Priority Date: 2000-04-13; Publication Date: 2006-03-07
- Brief Description: This patent describes equalization of transmit diversity space-time coded signals.
- Potential Anticipation (35 U.S.C. § 102): This patent focuses on the receiver side (equalization) for space-time coded signals. While it acknowledges the existence of transmit diversity space-time coded signals, its primary teaching is not the method of generating those signals as claimed in US7529305. Therefore, it is unlikely to anticipate claims 1 or 8 directly.
  - Claims potentially anticipated: Not directly anticipatory of claims 1 or 8, as its focus is on receiver equalization.
US20040013211A1
- Full Citation: US20040013211A1 to Lindskog Erik D.
- Publication/Filing Date: Priority Date: 2000-04-14; Publication Date: 2004-01-22
- Brief Description: This patent describes a time-reversal block transmit diversity system for channels with intersymbol interference and a method thereof.
- Potential Anticipation (35 U.S.C. § 102): This patent uses "time-reversal block transmit diversity," which inherently involves a temporal aspect and diversity. If the "time-reversal" mechanism results in the individual input symbols being represented across all transmit antennas at different, staggered times, it would directly anticipate claims 1 and 8 of US7529305. The use of "block transmit diversity" suggests a coding scheme across blocks of symbols and antennas. This patent could be highly relevant.
  - Claims potentially anticipated: Space-time coding, transmit diversity, particularly claims 1 and 8 if the time-reversal mechanism results in the specific delay-based full diversity.
US7139324B1
- Full Citation: US7139324B1 to Nokia Networks Oy.
- Publication/Filing Date: Priority Date: 2000-06-02; Publication Date: 2006-11-21
- Brief Description: This patent describes a closed-loop feedback system for improved downlink performance. It focuses on feedback mechanisms to enhance performance in wireless communication systems.
- Potential Anticipation (35 U.S.C. § 102): Similar to US6473467B1, this patent focuses on feedback systems and channel information. It is unlikely to anticipate the specific space-time coding and multiplexing scheme of US7529305's claims 1 and 8.
  - Claims potentially anticipated: Not directly anticipatory of claims 1 or 8, as its focus is on feedback systems.
US7050510B2
- Full Citation: US7050510B2 to Lucent Technologies Inc.
- Publication/Filing Date: Priority Date: 2000-12-29; Publication Date: 2006-05-23
- Brief Description: This patent describes an open-loop diversity technique for systems employing four transmitter antennas.
- Potential Anticipation (35 U.S.C. § 102): This patent describes an "open-loop diversity technique" for multiple transmit antennas. The priority date (2000-12-29) of this patent is after the priority date of US7529305 (2000-10-27). Therefore, US7050510B2 is not prior art to US7529305 under 35 U.S.C. § 102.

Summary of Most Relevant Prior Art:

The most relevant prior art documents would be those that explicitly teach the combination of distributing each input symbol across all M transmit antennas and ensuring those representations are transmitted at different times due to a delay mechanism. Based on titles and typical scope, the following are most likely to be highly relevant and require detailed examination for anticipation:

EP0993130A2 (Space time block coded transmit antenna diversity for WCDMA)
US7215718B1 (Combined channel coding and space-time block coding in a multi-antenna arrangement)
US6891897B1 (Space-time coding and channel estimation scheme, arrangement and method)
US20040013211A1 (Time-reversal block transmit diversity system for channels with intersymbol interference and method)

These patents are in the direct field of space-time coding and transmit diversity. A thorough review of their claims and detailed descriptions would be necessary to confirm if they explicitly disclose the specific "different times" and "delay arrangement" features for each input symbol in all output streams, as claimed in US7529305. Without that explicit disclosure, they would represent general prior art in the field but not necessarily anticipate the specific invention. US7050510B2 is not prior art to US7529305 due to its later priority date.