A new transmission and detection technique namely Dual Diffuser Modulation (DDM) for free space optical (FSO) communication systems is proposed. FSO communication systems can provide the line-of-sight optical transmission with low cost and good security. However, the distance dependent atmospheric turbulence and path-loss affect widespread use of FSO systems and limit their application to short...

The cascadability of uniform fibre Bragg grating for 40 Gbit/s return to zero on-off keying to non-return to zero on-off keying format conversion has been shown using OptSim simulation program. The main idea of this approach is use of specially designed uniform fibre Bragg grating with appropriate transfer function for shaping of 40 Gbit/s return to zero on-off keying optical spectrum. Error fr...

In this paper, the performance of optical code division multiple access (OCDMA) system is studied using differential phase shift keying (DPSK) with balanced detection (BD) and optical thresholding. For the OCDMADPSK receiver, the performance parameters (i) bit error rate (BER), (ii) receiver sensitivity and (iii) spectral efficiency for asynchronous multiple access network are evaluated and com...

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...

This letter demonstrates a CMOS impulse radio ultrawideband (IR-UWB) on–off keying (OOK) generator with multipulses per bit generation. The proposed IR-UWB OOK generator is implemented in 0.11 lm CMOS process where 1.33 mm proto-type accomplishes pulse train of 250 Mbps for one bit duration while consuming 10 mW from 1 V supply voltage. This pulse generator complies with the FCC spectral mask f...

Direct-detection optical code-division multiple-access (CDMA) systems employing overlapping pulse-position modulation (OPPM) schemes are proposed. Both upper and lower bounds on the bit error rate (BER) are derived taking into account the effect of both multiple-user interference and receiver shot noise. The photodiodes’ dark currents are neglected since their effect is minor. The throughput li...

This work proposes a novel demodulation circuit to address the implementation of Wake-Up Receivers (Wu-Rx) in Wireless Sensor Nodes (WSN). This RF demodulator, namely Modulated Oscillator for envelOpe Detection (MOOD), is compatible with both FSK and OOK/ASK modulation schemes. The system embeds an LC oscillator, an envelope detector and a base-band amplifier. To optimize the trade-off between ...

The astonishing performance of concatenated codes attracted many researchers and this has resulted in an explosive amount of literature since their introduction few years ago. As concatenation between codes did not actually arise from applying a pre-existing theory, most of their outstanding features remain to be explained. This paper gives some explanation of the concatenation between Reed Sol...

Die Sheffield-verpleegskool is een van die grootste in Engeland met meer as ’n 1 000 studente op 25 verskillende basiese en naregistrasie kursusse. Die klem val op die kliniese aspek en verbeterde, totale en geindividualiseerde pasiëntsorg. Onderrig in die kliniese situasie is dan ook ’n belangrike deel van die opleiding. ’n Geintegreerde benadering tot kurrikulumontwikkeling en -implementering...