Ultra wide band systems are considered as one of the most exciting technologies due to its capability of transmitting data over a wide frequency spectrum with very low power and high data rates. In any UWB receiver the low noise amplifier is the first stage. The LNA plays a crucial role in the whole reception chain. In this paper, we examine the performance of two different modulations techniqu...

We present two types of Si photonics-wireless interface (PWI) integrated circuits (ICs) realized in standard Si technology. Our PWI ICs convert optical signals into radio-frequency (RF) signals for downlink remote antenna units in fiber-wireless networks. Characterization and modeling of Si avalanche photodetectors (APDs) fabricated in two different Si technologies are carried out and used for ...

|It is shown that the bit LLR value in soft-output decoding of a binary linear block code with BPSK modulation can be closely modeled by a second BPSK modulation of reduced noise power. With this modeling, it is possible to provide bit error performance approximations to help in the evaluation of binary linear codes. This can also be used in the design of communications systems which require kn...

In this paper, rejection of multiple narrowband interferers in a binary phase shift keying modulated orthogonal frequency division multiplexing (BPSK-OFDM) system is investigated. The BPSK-OFDM system in consideration operates in an additive white Gaussian noise (AWGN) channel. A cascade complex coefficient adaptive infinite impulse response (IIR) notch filter with gradient-based algorithm is u...

In this paper, a comprehensive performance evaluative study has been made on a secured MIMO MCCDMA wireless communication system with implementation of Minimum Mean Square Error (MMSE) and ZeroForcing (ZF) Linear channel equalization schemes. The 4G compatible system deploys two channel encoding schemes(1/2-rated Convolutional and CRC ) under BPSK,DPSK QPSK and QAM digital modulations. In the p...

This paper incorporates a comprehensive BER simulation study undertaken on the effectiveness of a multi-user MIMO OFDMA wireless communication system on encrypted data transmission. The channel encoded and spatially multiplexed multi-user MIMO OFDMA system under investigation implements Pre-RSNA cryptographic algorithm. The simulated system deploys three linear signal detection schemes (Equaliz...

Radio controlled clocks (RCCs) based on the WWVB broadcast, commonly referred to as “atomic clocks”, might experience relatively high levels of on-frequency interference from the equivalent MSF time-code broadcast from the UK, particularly on the East Coast. The problem may be further exacerbated by a random orientation of the RCC device, which might favor the reception of the interfering signa...

This article provides an overview of the communications system that is being developed as part of the Micro Communications and Avionics Systems (MCAS). The first phase (MCAS1) effort is being focused on a digital binary phase-shift-key (BPSK) system with both suppressedand residual-carrier capabilities. The system is being designed to operate over a wide range of data rates from 1 kb/s to 4 Mb/...

In this paper we presents the bit error rate (BER) performance of the Cyclic Redundancy Check (CRC) coded Long Term Evolution (LTE) system under various digital modulations (BPSK, QPSK and 16PSK) over an additative white gaussian noise (AWGN) and other multi path fading (Raleigh and Rician) channels. It is apparent from the Matlab based simulation study that the proposed LTE system outperforms ...

In order to obtain a higher spectral separation from the BPSK-like signals, i.e. GPS C/A code, the signals proposed for future Galileo and GPS M-code signals are processed using split-spectrum type modulations, such as Binary Offset Carrier (BOC) modulation. These BOC modulations create deep fades (ambiguities) in the envelope of the Autocorrelation Function (ACF) of signal, and therefore the a...