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Structured Iterative and Circulant MIMO Chip Equalizer Architectures with FFT-acceleration for CDMA Systems
| Content Provider | Semantic Scholar |
|---|---|
| Author | Guo, Yuanbin McCain, Dennis Cavallaro, Joseph R. |
| Copyright Year | 2005 |
| Abstract | In this paper, we propose a class of novel structured linear MMSE chip equalizer architectures for the MIMO CDMA systems using FFT-accelerations. First, a Conjugate Gradient (CG) algorithm is applied to avoid the Direct Matrix Inverse (DMI), which has O((NF )3) complexity. By utilizing a revered form block-Toeplitz structure, the matrix multiplication in the CG iteration is accelerated by an equivalent frequencydomain FFT-based “overlap-save” architecture. The iteration rapidly refines a crude initial approximation to the actual final equalizer taps and significantly reduces complexity from O((NF )2) to O(NF log2(F )). Secondly, we propose a circulant architecture which also utilizes FFT-based acceleration by approximating the DMI with a block-circulant structure. An extensive comparative analysis in performance, numerical stability and complexity demonstrates promising performance/complexity tradeoff, especially for very long channels. Both algorithms not only reduce the complexity dramatically, but also provide unified parallel and pipelined structures, which is essential for practical real-time VLSI implementation of MIMO systems. |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | https://scholarship.rice.edu/bitstream/handle/1911/19933/Guo2005Jul1Structured.PDF?isAllowed=y&sequence=1 |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
