Simple implementations of mutually orthogonal complementary sets of sequences

This paper presents simple software and hardware implementations for a class of mutually orthogonal complementary sets of sequences based on its closed-form construction formula. Following a brief review of the Golay-paired Hadamard matrix concept, the flow graph for constructing mutually orthogonal Golay-paired Hadamard matrices, which represent the scalable complete complementary sets of sequences, is proposed. Then, their superb scalability and completeness are summarized. Finally, the C and Matlab functions and a logic schematic diagram are given to easily generate these complementary sequences

Characterizing the Structure-Function Relationship of Pathological Proteins

Protein structure and dynamics dictate the fundamentals of protein function. For example, a structured protein must change its conformation when interacting with various ligands. In addition, misfolded or intrinsically disordered proteins (IDPs) oligomerize into more structured aggregates or amyloid fibrils. Therefore, the study of protein conformations becomes necessary to further understand their cellular functions. By monitoring the exchange of backbone amide hydrogens as a measurement of protein dynamics, time-resolved hydrogen-deuterium exchange (TR HDX) provides advantages in capturing the subtle and transient structural differences over other equilibrium state techniques, such as X-ray crystallography and NMR. Using TR HDX together with other biophysical techniques, we demonstrate the unfolding of lipocalin 2 (Lcn2) in accommodating siderophores. In the second part, we attempt to understand the change in aggregation rate corresponding to conformational changes of polyglutamine expansion protein, huntingtin exon1 (Httex1)

Effect of DC offset on OFDM system with zero-padded suffix

The effect of direct current (DC) offset on orthogonal frequency division multiplexing (OFDM) system with zero-padded (ZP) suffix is analysed in this paper. It is found that the ZP appended OFDM system suffers more from DC offset than a cyclic prefix inserted OFDM system and even demonstrates bit error flooring if the DC power exceeds a maximum allowed threshold. Simple algorithms are also proposed for DC offset estimation and compensation. The analysis is confirmed by simulation using multiband OFDM specification for ultra-wideband application

MMSE-optimal approximation of continuous-phase modulated signal as superposition of linearly modulated pulses

The optimal linear modulation approximation of any M-ary continuous-phase modulated (CPM) signal under the minimum mean-square error (MMSE) criterion is presented in this paper. With the introduction of the MMSE signal component, an M-ary CPM signal is exactly represented as the superposition of a finite number of MMSE incremental pulses, resulting in the novel switched linear modulation CPM signal models. Then, the MMSE incremental pulse is further decomposed into a finite number of MMSE pulse-amplitude modulated (PAM) pulses, so that an M-ary CPM signal is alternatively expressed as the superposition of a finite number of MMSE PAM components, similar to the Laurent representation. Advantageously, these MMSE PAM components are mutually independent for any modulation index. The optimal CPM signal approximation using lower order MMSE incremental pulses, or alternatively, using a small number of MMSE PAM pulses, is also made possible, since the approximation error is minimized in the MMSE sense. Finally, examples of the MMSE-optimal CPM signal approximation and its comparison with the Laurent approximation approach are given using raised-cosine frequency-pulse CPM schemes

A Case Study of Phonics among Primary School Students

Phonics is a widely implemented teaching approach in primary schools in many English speaking countries. Through a flexural development, the teaching approach has been proved to be an efficient way of improving children’s decoding, spelling and general reading ability. This paper reports case study of presenting phonics to 10 students in Grade 3 in China. The study shows that phonics teaching can help the students to form a connection between words and their pronunciation, hence help students to acquire the ability to decode and spell new words in their further reading

Dynamic Bandwidth MCIDS - A Cognitive Solution for MCIDS based UWB Communications

Dynamic bandwidth multicode interleaved direct sequence (MCIDS), an enhanced MCIDS based Ultra-wideband (UWB) application is proposed in this paper, featuring a cognitive transmission bandwidth adaptation without any adverse effect on the data rate. By introducing a specific lowpass filtering and down-sampling into the traditional MCIDS algorithm, this system can decrease the transmission bandwidth into part of its original bandwidth but still be able to recover all the transmitted data from the reduced bandwidth. This solution can efficiently improve the coexistence ability of UWB devices in a cognitive manner without increasing hardware complexity

Effect of DC Offset on OFDM System with Zero-Padded Suffix

The effect of direct current (DC) offset on orthogonal frequency division multiplexing (OFDM) system with zero-padded (ZP) suffix is analysed in this paper. It is found that the ZP appended OFDM system suffers more from DC offset than a cyclic prefix inserted OFDM system and even demonstrates bit error flooring if the DC power exceeds a maximum allowed threshold. Simple algorithms are also proposed for DC offset estimation and compensation. The analysis is confirmed by simulation using multiband OFDM specification for ultra-wideband application