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A VLSI architecture of the square root algorithm for V-BLAST detection

  • Zhan Guo
  • Peter Nilsson
Publiceringsår: 2006
Språk: Engelska
Sidor: 219-230
Publikation/Tidskrift/Serie: Journal of VLSI Signal Processing
Volym: 44
Nummer: 3
Dokumenttyp: Artikel i tidskrift
Förlag: Springer


MIMO has been proposed as an extension to 3G and Wireless LANs. As an implementation scheme of MIMO systems, V-BLAST is suitable for the applications with very high data rates. The square root algorithm for V-BLAST detection is attractive to hardware implementations due to its low computational complexity and numerical stability. In this paper, the fixed-point implementation of the square root algorithm is analyzed, and a low complexity VLSI architecture is proposed. The proposed architecture is scalable for various configurations, and implemented for a 4 x 4 QPSK V-BLAST system in a 0.35 mu m CMOS technology. The chip core covers 9 mm(2) and 190 K gates. The detection throughput of the chip depends on the received symbol packet length. When the packet length is larger than or equal to 100 bytes, it can achieve a maximal detection throughput of 128 similar to 160 Mb/s at a maximal clock frequency of 80 MHz. The core power consumption, measured at 2.7 V and room temperature, is about 608 mW for 160 Mb/s data rate at 80 MHz, and 81 mW for 20 Mb/s at 10 MHz. The proposed architecture is shown to meet the requirements for emerging MIMO applications, such as 3G HSDPA and IEEE 802.11n.


  • Electrical Engineering, Electronic Engineering, Information Engineering
  • wireless LAN
  • fixed-point
  • square root algorithm
  • MIMO
  • ASIC
  • VLSI
  • 3G


  • Elektronikkonstruktion-lup-obsolete
  • ISSN: 0922-5773

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