Detection of Impulse Radio Ultra-Wideband Signals using Recursive Transmitted Reference Receivers

Abstract

Abstract-For the detection of impulse radio (IR) UWB signals, complex RAKE receiver or low-complexity transmitted reference (TR) autocorrelation receivers can be used. However, there is a performance loss associated with the low-complexity TR scheme. This paper proposes recursive structures of the conventional TR and averaged TR schemes to improve the detection performance of IR-UWB signals. The performance of proposed schemes is evaluated over the standard IEEE 802.15.4a multipath channels. The performance is compared with conventional TR receivers in terms of uncoded bit-error-rate (BER), assuming that the channel is quasi-static. For averaged and recursive averaged TR schemes, the TR sequence is also slightly modified. The simulation results validate that the proposed schemes has better performance by about 2 dB than the conventional TR and averaged TR receivers.

Bit error rate improvement scheme for transmitted reference UWB systems

“…In the conventional RTR-UWB system [10], β and γ are fixed at 1/2. In this case, the receiver does not perform the balanced averaging process with the received reference signals.…”

“…The recursive receiver structure is based on the method (termed "Conventional RTR" hereafter) presented in [10]. In the recursive averaging process, the conventional RTR-UWB system performs the unbalanced averaging with the received reference signals, so that the SNR of the reference template is not effectively increased.…”

Non-coherent impulse radio UWB receiver for wireless body area network system

“…Such symbol unit recursive process is applied in [8] which weigh more value to the recent averaged reference than the previous one. However, the proposed architecture weighs the same value to make the equally-weighted frame unit aver aged templates.…”

“…To solve this problem, [6] has proposed the improved demodulation teclmology by means of linear weighting. In addition, averaging the reference pulses within one symbol duration [7] and recursively averaging the present averaged reference with previous one [8] to improve the performance over the conventional averaging-based TR scheme have been proposed. However, since [8] doesn't weigh the present and the previous averaged reference equally, the performance de gradation occurs.…”