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Recently approved IEEE 802.15.4a standard defines an ultra-wideband (UWB) based physical layer technique, and performance analysis of UWB systems shows that the pulse waveform will affect the received SINR when multipath interference, multiple access interference and additive white Gaussian noise are considered. In order to obtain an optimal pulse waveform in UWB based wireless sensor networks, the...
This paper proposes a FIR-RAKE receiver algorithm that makes use of a pilot signal broadcast by the TD-SCDMA (time division-synchronous code division multiple access) base station to obtain channel parameter estimates in the downlink of TD-SCDMA wireless network. The algorithm can reduce multipath interference for the mobile units and with lower complexity of FIR implementation, where only one marching...
Presented low-density parity-check (LDPC) decoding exhibits poor BER performance for multipath channel (MPC). To solve the problem, this paper proposes an adaptive LDPC decoding system, which composes two parts: adaptive equalizer and LDPC decoder. In this scheme, adaptive equalizer resorts to the training sequence transmitted from transmitter, removes the multipath interference (MPI), then LDPC decoder...
The BER performance of presented CDMA systems will rapidly deteriorate under the conditions of strong electrical and multipath interferences. To solve the problem, this paper develops a complementary spreading CDMA (CS-CDMA) system with complementary codes. Different from the classical CDMA systems, the base station of CS-CDMA assigns complementary spreading codes for every mobile stations, the mobile...
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