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Time hopping-biorthogonal pulse position modulation (TH-BPPM) performance is characterized using a modified Saleh-Valenzuela (S-V) ultra wideband (UWB) channel model as adopted by the IEEE for personal area networks (PANs). TH-BPPM performance is characterized for single and multiple user scenarios using up to 20 multipath signals from each of 10 users operating for both synchronous and asynchronous...
A tunable ultra-wideband (UWB) pulse generator is designed and simulated with standard 0.18 mum CMOS technology. By using a voltage controlled delay line (VCDL) technique, the proposed UWB pulse generator can adjust the pulse width, adding flexibility for use with different UWB applications. Moreover, each peak of the proposed UWB pulse is separately controlled so that it complies with the FCC regulation...
Several variations of the sum-product algorithm (SPA) have been proposed for the decoding of the low density parity check (LDPC) codes. Among these, the log domain belief propagation algorithm (log-BPA or simply BPA) is widely adopted in most of the proposed LDPC decoder architectures. The check node unit (CNU), which computes the check-to-variable (C2V) messages, is computationally the most complex...
The stringent emission mask and interference specifications in ultra-wideband (UWB) impulse radios present great challenges for the transceiver architecture design and circuit implementation. This paper proposes to use integrated distributed transversal filters (DTF) for pulse shaping in the transmitter and for narrow-band interference (NBI) suppression in the receiver. Analyses show that an integrated...
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