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Performance of UWB time-hopping spread-spectrum impulse radio in multipath environments

Guangrong Yue, Lijia Ge, Shaoqian Li

Open publisher page 14 citations

Abstract

This paper presents the theoretical analysis of BER performance for ultra wideband (UWB) impulse radio systems in multipath propagation channels. Both time-hopping pulse-position-modulation (TH-PPM) and the time-hopping pulse-amplitude-modulation (TH-PAM) are considered. The closed-form BER formulas are derived. The impact of system parameters on the BER performance is discussed. It is demonstrated that the impact of multipath propagation on TH-PAM UWB radio is different from that on TH-PPM UWB radio, which is analyzed in detail. For the TH-PPM scheme, the multipath propagation time-delay may lead to unbalanced BER over "0"-"1" in some particular multipath channels. For the TH-PAM scheme, however, there exists no such unbalance of BER over "0"-"1". In typical deterministic multipath environment, to obtain the same BER performance of 10/sup -4/, the required SNR for TH-PPM scheme is about 7dB larger than that for TH-PAM.

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What this paper is about

This paper presents the theoretical analysis of BER performance for ultra wideband (UWB) impulse radio systems in multipath propagation channels. Both time-hopping pulse-position-modulation (TH-PPM) and the time-hopping pulse-amplitude-modulation (TH-PAM) are considered. The closed-form BER formulas are derived. The impact of system parameters on the BER performance is discussed. It is demonstrated that the impact of multipath propagation on TH-PAM UWB radio is different from that on TH-PPM UWB radio, which is analyzed in detail. For the TH-PPM scheme, the multipath propagation time-delay may lead to unbalanced BER over "0"-"1" in some particular multipath channels. For the TH-PAM scheme, however, there exists no such unbalance of BER over "0"-"1". In typical deterministic multipath environment, to obtain the same BER performance of 10/sup -4/, the required SNR for TH-PPM scheme is about 7dB larger than that for TH-PAM.

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Available abstract

This paper presents the theoretical analysis of BER performance for ultra wideband (UWB) impulse radio systems in multipath propagation channels. Both time-hopping pulse-position-modulation (TH-PPM) and the time-hopping pulse-amplitude-modulation (TH-PAM) are considered. The closed-form BER formulas are derived. The impact of system parameters on the BER performance is discussed. It is demonstrated that the impact of multipath propagation on TH-PAM UWB radio is different from that on TH-PPM UWB radio, which is analyzed in detail. For the TH-PPM scheme, the multipath propagation time-delay may lead to unbalanced BER over "0"-"1" in some particular multipath channels. For the TH-PAM scheme, however, there exists no such unbalance of BER over "0"-"1". In typical deterministic multipath environment, to obtain the same BER performance of 10/sup -4/, the required SNR for TH-PPM scheme is about 7dB larger than that for TH-PAM.

Key concepts: Multipath propagation, Pulse-position modulation, Time-hopping, Impulse radio, Delay spread, Ultra-wideband, Bit error rate, Electronic engineering

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