A 4x4 MIMO-OFDM Low Complexity Receiver using Novel Detection Algorithms for future generation Wireless Applications

The Multiple Input Multiple Output Orthogonal Frequency Division Multiplexing Technology (MIMO-OFDM) may become an inevitable contender for being deployed in almost all types of future generation wireless communication systems for attaining high spectral efficiency at extremely high throughput. The technical constraint in realization of such systems is high computational complexity of the detector when designed for higher order MIMO with 64-QAM & 256 QAM. This paper presents design and development of a novel detection algorithm based on Adaptive Sphere decoding technique to realize a low complexity 4x4 MIMO-OFDM receiver. The new algorithms are tested with LTE standards on MATLAB platforms, have shown significant reduction in computational complexities in terms of number of nodes traversed, Flops, Complex Multiplications, etc, and still performing at par with optimal detectors. The proposed detection algorithms may serve as one of the strong contenders to be deployed in future generation wireless standards. Keywords—MIMO, OFDM, receiver, detection,