Publication

Abstract : The Millimeter Wave (MMW) band much useful for wireless indoor communications as it offers a large amount of license free spectrum. Blockage by walls and furniture limits the range indoors, the link range for indoors being 10m and outdoors 100m in the case of spatial reuse. The idea of dual-band integration of 5GHz/60GHz conceived by IST-Broadway is considered. The physical link layer throughput achievable in 5GHz would be limited by the available bandwidth while the huge bandwidth available for 60GHz would make it feasible for multi-gigabit link. Spatial multiplexing can offer large capacity gains if the spatial correlation is low. In this work, MIMO channel for 5 GHz and 60 GHz is modeled and the channel capacity is determined. The Triple Saleh Valenzuela model (desktop environment) is chosen as suitable channel model for Millimeter Wave while IEEE 802.11n channel model B (small offices) is chosen for 5GHz. The power delay profile obtained on simulation gives the Rician factor and the RMS delay spread indicating multipath fading and timedispersive channel. The performance is analysed with respect to bit error rate (BER) for various antenna configurations with transceiver distance of 3m. Consideration of Line -of-Sight (LOS) component shows reduced BER in lower Eb/No range of 1 to 4 dB for 60 GHz compared to 5 GHz radio. This result makes MMW suitable for integration with 5 GHz, whose link is weak for short range communication. The bit error rate (BER) is compared for 2x2, 4x4, and 8x8 for different equalization techniques namely Zero Forcing (ZF), Maximum Likelihood (ML) and Minimum Mean Square Error (MMSE) for the two cases, which in turn had reinforced the fact of better performance of MMW. ML detection offers optimal error performance for 60 GHz. The channel capacity is found to be 2 Gbps for 60GHz and 600 Mbps for 5GHz. The link budget for MMW is also analyzed.