Abstract—In wireless systems supporting slowly moving users, adaptive trellis-coded modulation (TCM) schemes have demonstrated large bandwidth efficiency gains over their nonadaptive counterparts. In systems with highly mobile users, the recently proposed adaptive bit-interleaved coded modulation (BICM) achieves a moderate bandwidth efficiency gain over previously proposed adaptive schemes and ...

Multiple-antenna channel coding for orthogonal frequency-division multiplexing (OFDM) transmission over dispersive channels is reconsidered because with frequency interleaving, the effective channel characteristic across subcarriers is rather fast fading. The channel does not comply with the quasistatic model widely assumed for space-time trellis codes (STCs). For that reason, we first study th...

This paper presents an 8-GS/s, 12-bit input ∆Σ DAC with 200-MHz bandwidth in 65-nm CMOS. The high sampling rate is achieved by a two-channel interleaved MASH 1-1 digital ∆Σ modulator with 3-bit output, resulting in a highly digital DAC with only seven current cells. The two-channel interleaving allows the use of a single clock for both the logic and the final multiplexing. This requires each ch...

Until the late seventies, research in speech compression followed two di erent directions: vocoders (abbreviation of voice coders) and waveform coders. The two approaches substantially di er in their underlying principles and performance. Whereas the rst explore our knowledge of speech production, attempting to represent the signal spectral envelope in terms of a small number of slowly varying ...

This paper presents an optimized methodology to design and deploy Speech Enhancement (SE) algorithms based on Recurrent Neural Networks (RNNs) a state-of-the-art MicroController Unit (MCU), with 1+8 general-purpose RISC-V cores. To achieve low-latency execution, we propose software pipeline interleaving parallel computation of LSTM or GRU recurrent blocks, featuring vectorized 8-bit integer (IN...

A novel simple receiver structure for M -ary differential phase–shift keying (MDPSK) transmission over flat Rayleigh fading channels without channel state information is proposed. We apply convolutional codes for error correction and bit–interleaving as appropriate means to combat the effects of fading. In the decoding the hard decisions of the Viterbi algorithm are fed back to enable a more re...

This paper investigates the performance of ordered statistics decoding of linear block codes with binary differential phaseshift-keying (2DPSK) transmission on the wide-sense-stationary uncorrelated-scattering (WSSUS) Rayleigh fading channel. For typical mobile speed 60 mph, tropospheric scatter radio communication at carrier frequency 900 MHz and very low bit rate video communication at transm...

A 9-bit 11GS/s current-steering (CS) digital-to-analog converter (DAC) is designed in 28nm FDSOI. The DAC uses two-times interleaving to suppress the effects of the main error mechanisms of CS DACs while its clock timing can be tuned by the back gates bias voltage of the multiplexer transistors. The DAC achieves higher than 50dB SFDR and less than -50dBc IM3 over Nyquist at a sampling rate of 1...

In this report, we consider the performance of trellis coded multilevel differential phase-shift-keying (MDPSK) over Rician and Rayleigh fading channels. For operation at L-Band, this signaling technique leads to a more robust system than the coherent system with dual pilot tone calibration previously proposed for UHF. The results are obtained using a Combination of analysis and simulation. The...