VLSI Implementation of a Scalable Pipeline MMSE MIMO Detector for a 44 MIMO-OFDM Receiver

Shingo YOSHIZAWA  Hirokazu IKEUCHI  Yoshikazu MIYANAGA  

IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences   Vol.E94-A   No.1   pp.324-331
Publication Date: 2011/01/01
Online ISSN: 1745-1337
DOI: 10.1587/transfun.E94.A.324
Print ISSN: 0916-8508
Type of Manuscript: PAPER
Category: VLSI Design Technology and CAD
wireless communications,  MIMO-OFDM,  MIMO detection,  MMSE,  

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MIMO-OFDM performs signal detection on a subcarrier basis which requires high speed computation in MIMO detection due to its large computational cost. Conventional designs in a MIMO detector increase processing time in proportion to the number of subcarriers and have difficulty in real-time processing for large numbers of subcarriers. A complete pipeline MMSE MIMO detector presented in our previous work can provide high speed computation. However, it tends to be excessive in a circuit scale for small numbers of subcarriers. We propose a new scalable architecture to reduce circuit scale by adjusting the number of iterative operations according to various types of OFDM system. The proposed detector has reduced circuit area to about 1/2 to 1/7 in the previous design with providing acceptable latency time.