Optimal receiver bandwidth for energy-detection PPM UWB systems

Abstract

Non-coherent UWB receivers are often implemented using energy detection architectures which are very sensitive to noise in the channel and interference. Therefore, the receiver bandwidth plays an important role since the total noise and interference energy is proportional to this bandwidth. This work provides analytical expressions to find the optimal receiver bandwidth and quantifying the effect on the bit-error-rate (BER) due to channel noise and adjacent-channel interference (ACI). A reduction in receiver bandwidth beyond the optimal point is shown to have minimal impact on BER performance when ACI is negligible.

M-ary energy detection of a Gaussian FSK UWB system

“…When UWB signals pass through the channel, the long channel delay leads to a very large 2TW value and Gaussian approximation can achieve accurate result. The application of Gaussian approximation in energy detection UWB systems can be seen in [2][3][4][9][10][11][12][13][14]. The chi-square variable can be approximated as Gaussian variables [4,15].…”