A Sub-Band Based Technique for Low Power Medium Data Rate Ultra Wide Band Communication

A sub-band based ultra wideband (SUWB) system is proposed. The technique provides scope for using the ultra wideband bandwidth efficiently by exploiting the available link margin for short range communications. The bandwidth of 500 MHz or more is divided into a fixed number of sub-bands. The data transmission scheme over multiple sub-bands can be designed to achieve higher data rate, higher reliability or support multi-user access. The SUWB system facilitates low power implementations by reducing the sampling rate requirements and also by the use of an orthogonal spreading code based interference rejection and multi-path cancellation receiver. The SUWB system avoids the need for individual down-conversion and filtering of the sub-bands. The requisite properties of the spreading codes are also provided. The simulation results in terms of the BER performance of the method for the IEEE 802.15.4a channel models are presented. The desirable performance is obtained for low and medium delay spread channels even without employing any equalization method.