On the Construction of High-Rate Quasi-Orthogonal STBC for MIMO QR Demodulation(Communications and Wireless Systems, <Special Section>Recent Advances in Circuits and Systems-Part 1)

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概要

• 論文の詳細を見る

• Orthogonal space-time block codes (STBCs)[1], [2] appear to be a very fascinating means of enhancing reception quality in quasistatic MIMO channels due to their full diversity, and especially their simple maximum-likelihood (ML) decoders. However, full-rate full-diversity orthogonal STBCs do not exist for more than two transmit antennas. Vertical layered space-time architecture (so-called the V-BLAST)[3] with a nulling- and cancelling-based detection algorithm, in contrast, has an ability of achieving high transmission rates at the cost of having very low diversity gain, an undesirable consequence caused by the interference nulling and cancelling processes. The uncoded V-BLAST system is able to reach its ML performance with the aid of the sphere decoder algorithm [4] at the expense of higher detection complexity. Undoubtedly, the tradeoff between transmission rates, diversity, and complexity is inherent in designing space-time codes. This paper investigates a method to increase the "nulling diversity gains" for a general high-rate space-time code and introduces a new design strategy for high-rate space-time codes detected based on interference nulling and cancelling processes, thanks to which high-rate quasi-orthogonal space-time codes for MIMO applications are proposed. We show that when n_T transmit and n_R=n_T receive antennas are deployed, the first code offers a transmission rate of (n_T-1) with a minimum nulling diversity order of 3, whereas the second one offers a transmission rate of (n_T-2) with a minimum nulling diversity order of 5. Therefore, the proposed codes significantly outperform the V-BLAST as n_R=n_T. Simulation results and discussions on the performance of the proposed codes are provided.

• 社団法人電子情報通信学会の論文
• 2005-07-01

著者

• YOON Giwan

  School of Engineering, Information and Communications University (ICU)

• Yoon Giwan

  School Of Eng. Information & Communications University (icu)

• Pham Van

  School Of Eng. Information & Communications University (icu)

• Le Minh-tuan

  Cel Laboratory Information & Communications University

• Le Minh

  School Of Eng. Information & Communications University (icu)

• MAI Linh

  School of Eng., Information & Communications University (ICU)

• Mai Linh

  School Of Eng. Information & Communications University (icu)

• Pham Van-su

  Information And Communications Univ. School Of Engineering Communication Electronics Laboratory

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