Hybrid technology for next generation broad band mobile radio communications

Multi-carrier system has been fuelled by large demand on frequency allocation, resulting in a crowded spectrum as well as large number of users requiring simultaneous access. Existing wireless systems may be utilized single frequency, single antenna and pulse for carrier transmission and reception. Problems of such system is that in case of failure the total system will become non operational. So we established a distributed system in terms of multi-carrier, multiantenna and coded pulse can provide a more suitable communication and sensor gives rise to DSSS-OFDM-MIMO based hybrid technology is the ultimate solution. This paper deals with the performance analysis of hybrid system to efficiently improve the link reliability/spectral efficiency of very high data rate communication systems. In this approach we interface DSSS to OFDM. Then we integrate this DSSS-OFDM to MIMO. This proposal is originally given for the operation in the 60 GHz band but without MIMO, if sufficient bandwidth is available. If the bandwidth is not available, we achieve the high throughput using MIMO) techniques. In particular, we apply MIMO detection methods based on Vertical Bell Labs Layered Space Time (V-BLAST) ordering techniques to hybrid systems with padding and without padding for different modulation techniques. Simulation results show that the proposed MIMO-OFDM-DSSS provides both frequency diversity and spectral efficiency to yield a powerful solution to the ever-increasing requirement of high throughput cell phones and ITS.