A. Kent proposed a quantum bit string commitment protocol in 2003. Not using the standard two conjugate states |0〉, |1〉, |+〉 and |−〉, the protocol uses ψ0 = |0〉 and ψ1 = sin θ|0〉 + cos θ|1〉, where θ 6= 0. In this paper, we show that the protocol can not guarantee security to the receiver. (1 − sin2 θ 2 )n bits are definitely exposed to the receiver, where n is the length of the committed string.

An optical receiver for 40 Gbit=s communication systems with 8274 V=W conversion gain and 950 mVp–p limiting differential output is reported. A back-to-back sensitivity of 9.4 dBm at a bit error rate of 10 12 was observed for a 2 1 pseudorandom binary sequence. The receiver incorporates an InP based pin diode, a transimpedance amplifier and a limiting amplifier. This is the largest conversion g...

This paper deals with the design of receivers for uplink quasi-synchronous MC-DS-CDMA systems. Our purpose is twofold. Firstly, we aim at designing a reduced-rank MMSE receiver based on a matrix polynomial expansion of the inverse of the received signal autocorrelation matrix. This receiver makes it possible to get a compromise between computational cost and performances in term of Bit Error Ra...

An orthogonal decomposition of a general wideband space-time multipath channel is derived assuming antenna arrays at both the transmitter and receiver. This decomposition provides a framework for efficiently managing the available space-time channel dimensions using channel state information at the transmitter and receiver. Signaling and receiver designs for high throughput applications are der...

A novel bit-interleaved coded modulation with iterative detection and decoding (BICM-IDD) receiver for multiple-input and multipleoutput (MIMO) systems using Max-Log-MAP algorithm is proposed. This receiver improves the detection and decoding performance by an improved turbo principle, in which pre-scaling the input information of the detector is performed at each iteration. From an information...

A low power adaptive digital baseband architecture is presented for a low-IF receiver of IEEE 802.15.4-2006. The digital section’s sampling frequency and bit width are used as knobs to reduce the power under favorable signal and interference scenarios, thus recovering the design margins introduced to handle the worst case conditions. We show that in a 0.13 μm CMOS technology, for an adaptive di...

In this paper, a power-efficient low-complexity iterative receiver structure for noncoherent transmission over Rayleigh flat fading channels without channel state information (CSI) is presented. As the main contribution, several novel decision-feedback assisted differential demodulators are derived, which are well suited to implementation. Thereby, the general case of multiple transmit and mult...

A dedicated wake-up receiver may be used in wireless sensor nodes to control duty cycle and reduce network latency. However, its power dissipation must be extremely low to minimize the power consumption of the overall link. This paper describes the design of a 2 GHz receiver using a novel “uncertain-IF” architecture, which combines MEMS-based high-Q filtering and a free-running CMOS ring oscill...

this study evaluates the discriminative power of sequential spectrum analysis of the short-term electrocardiogram (ecg) time series in separating normal and subjects with life threatening arrhythmias like, ventricular tachycardia/fibrillation (vt/vf). the raw ecg time series is transformed into a series of binary symbols and the binary occupancy or relative distribution of mono-sequences (i.e. ...

This paper presents a 115-mW Global Positioning System radio receiver that is implemented in a 0.5m CMOS technology. The receiver includes the complete analog signal path, comprising a low-noise amplifier, I-Q mixers, on-chip active filters, and 1-bit analog-digital converters. In addition, it includes a low-power phase-locked loop that synthesizes the first local oscillator. The receiver achie...