Bit error rates of uplink and downlink Multicarrier Code Division Multiple Access (MC-CDMA) system using coherent Maximal-Ratio Combing (MRC) and Equal Gain Combining (EGC) receivers are estimated over Rayleigh fading channels. The analysis assumes that different subcarriers experience independent fading channels, but not necessary identically distributed. The analysis is based on Gaussian appr...

Hamming code is familier for its single-bit error detection & correction capability. To provide such a capability, it introduces 4 redundancy bits in a 7-bit data item. These redundancy bits are to be interspersed at bit positions (n = 0, 1, 2, 3) with the original data bits. After error detection & correction, if any, the data bits have to be reassembled by removing the redundancy bits. In the...

A new detector for optical code-division multipleaccess (CDMA) communication systems is proposed. This detector is called the chip-level receiver. Both ON–OFF keying (OOK) and pulse-position modulation (PPM) schemes, that utilize this receiver, are investigated in this paper. For OOK, an exact bit error rate is evaluated taking into account the effect of both multiple-user interference and rece...

Bit synchronization is an important operation used at the receiving end of synchronous communication systems for providing a reference bit clock to the receiver; this reference marks the instants at which transition in data bits occur at the transmitting end. In some DPSK demodulator realizarions, like the integrate-and-dwnp scheme, the bit clock is essential for &a recovery itself. But in most...

A novel wake-up receiver for wireless sensor networks is introduced. It operates with a modified medium access protocol (MAC), allowing low-energy consumption and practical latency. The ultra-low-power wake-up receiver operates with enhanced duty-cycled listening. The analysis of energy models of the duty-cycle-based communication is presented. All the WuRx blocks are studied to obey the duty-c...

This paper presents the implementation of Bluetooth Low Energy Controller (BTLE), Low Intermediate Frequency (IF), Gaussian Frequency Shift Keying (GFSK) Modulation and Demodulation technique. The GFSK modulation uses a bandwidth bit period product BT=0.5. The modulation index shall be configurable between 0.45 and 0.55. A binary one shall be represented by a positive frequency deviation, and a...

We present a fully integrated 12.5-Gb/s optical receiver fabricated with standard 0.13-µm complementary metal-oxide-semiconductor (CMOS) technology for 850-nm optical interconnect applications. Our integrated optical receiver includes a newly proposed CMOS-compatible spatially-modulated avalanche photodetector, which provides larger photodetection bandwidth than previously reported CMOS-compati...

In this paper we analyze the effect that the application of channel coding produces on the performance of the watermark detection and decoding tests for copyright protection of images. Detector structures are derived for both tests and analytical bounds and approximations are obtained for the bit error rate (BER) and the receiver operating characteristic (ROC) associated with the watermark deco...

In this paper, we propose a new algorithm for generating a high quality test bit-stream to evaluate the static image quality of DTV receiver based on a target bit allocation in the process of rate control. In order to allocate the number of target bits, we consider the normalized complexities, which are updated or maintained according to GOP picture qualities. The proposed rate control method i...

A InGaAs PIN-photodetector and a lumped SHBT-transimpedance-preamplifier have been mono-lithically integrated and characterized. The preamlifier achieves a transimpedance gain of 44:6 dB (170) and the optical/electrical ?3dB-bandwidth of the entire receiver is 46 GH z. This is, to the best of our knowledge, the highest bandwidth for any HBT based photoreceiver reported to date.