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Bit-interleaved coded modulation with iterative decoding (BICM-ID) performs well under a variety of channel conditions. Based on a factor graph representation of BICM-ID, we propose a modification of the BICM-ID receiver that can reduce the computational complexity significantly without BER degredation. The basic idea is to avoid updates of code bit log-likelihood ratios whose magnitude is already...
Efficient use of spectrum requires an accurate determination of interference effects. In this paper, we introduce a radio to radio (R2R) factor that quantifies the interference effects of one radio waveform on another based on multiple waveform properties instead of solely on intermediate frequency (IF) signal power. The R2R factor is formulated as a dimensionless correction term in the victims communication...
In chaos communication schemes, the differential chaos shift keying(DCSK) is a noncoherent scheme with correlation detector. In spite of this there is currently no established procedures attaching importance to the correlation of noises within a code period, which is one of the reasons for the degradation of performance of DCSK system. This paper put forward an improved scheme for noise reduction...
This paper studies the BER performance of a multiband UWB system with a common RF and ADC module in the receiver. Communication signals in multiple RF bands are received by one UWB antenna. The ADC samples the received signal in a swath. This means that the RF signals with lower frequencies are oversampled. Using the ADC output signal, the demodulator demodulates each RF signal individually. The quantization...
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