SYSTEM AND METHOD FOR SUB-SAMPLED OFDM BASED SUB-BAND WIDEBAND FOR ENERGY EFFICIENT UWB AND 60 GHZ COMMUNICATIONS

摘要

System and method for Sub-sampled OFDM based Sub-band Wideband for Energy Efficient UWB and 60 GHz Communications is disclosed. The disclosed sub-sampled OFDM based SWB system offers as a means to mitigate the channel impairments with reduced complexity at the rate of the sub-band bandwidth. The method is applicable to wideband systems in general and UWB and 60 GHz systems in particular. An OFDM based transmission is used in each sub-band and along each sub-carrier, a spreading sequence is used. At the receiver the signal is sampled at the rate of the sub-band bandwidth and an OFDM demodulation is carried out at this rate. This induces flat fading channels on each sub-carrier with the aliased components and the unwanted sub-bands are rejected using the dispreading process. Three different channel estimation methods are also disclosed. The method is proposed at the lower sampling rate and hence is of reduced complexity. FIG. 1