With dlgitsdadaptiveequalizersthe performanceof a dlgkal radio modem for quadrature amplitude modulation (QAM,) can be improved considerably. In this paper the design and fabrication of a fully digitaf adaptive equalizer chip for QAM digitaf radio modems is reported. The chip contains 107936 transistors on a silicon area of 94.6 mmz. The chip was designed in a 2-pm CMOS technology for a clock a...

Polarization mode dispersion (PMD) is a challenge for high-data-rate optical-communication systems. More researches are desirable for impairments that is induced by PMD in high-speed optical orthogonal frequency division multiplexing (OFDM) transmission system. In this paper, an approximately analytical method for evaluating the power penalty due to first-order PMD in optical OFDM with quadratu...

Ab s t r a E t This paper describes an implementation of high-speed multi-level Quadrature Amplitude Modulation (QAM, modems using Xilinr Krtex-II Field Programmable Gate Arrays (FPGA). The design starts with system-level simulations and exploits different architectures and algorithms available for digitalfilters, which is a key component of a QAM modem. System efticiency is highlighted with th...

Approximate Symbol error rate (SER) expressions are derived for receive diversity system employing optimum combining, when both the desired and the interfering signals are subjected to Rician fading, for the case of a) equal power uncorrelated interferers b) unequal power interferers c) interferer correlation. The derived expressions are applicable for an arbitrary number of receive antennas an...

Video Broadcasting is playing a key role in communication areas. DVB-T has popular Technology for Digital Television Services. In this paper aim was to Implement all function Block in as per specified in the DVB-T (terrestrial based digital video broadcasting) and analyzed using Transmitter and receiver both side using filter. DVB-T 2K mode carriers are transmitted over AWGN Channel. The corrup...

Recently, coherent-detection (CoD) polarization multiplexed (PM) transmission has attracted considerable interest, specifically as a possible solution for next-generation systems transmitting 100 Gb/s per channel and beyond. In this context, enabled by progress in ultra-fast digital signal processing (DSP) electronics, both multilevel phase/amplitude modulated formats (such as QAM) and orthogon...

In this paper, quadrature amplitude modulation – trellis coded modulation (QAM-TCM) schemes are designed using recursive convolutional (RC) encoders over Galois field GF(2 N ). These encoders are designed using the nonlinear leftcirculate (LCIRC) function. The LCIRC function performs a bit left circulation over the representation word. Different encoding rates are obtained for these encoders wh...

A dual-rate 4.7/6.5 kbits/s algebraic code excited linear predictive (ACELP) codec is proposed for adapt ive speech communicators, which can d r o p their source ra te a n d speech quali ty under network control i n order t o invoke a more e r ro r resilient modem amongst less favourable channel conditions. Sourcematched Bose-Chaudhuri-Hocquenghem (BCH) codecs combined with un-equal ,protection...

In this paper we analyze the performance of 2*4 MIMO-MC-CDMA system in MATLAB which highly reduces BER. In this paper we combine MIMO and MC-CDMA system to reduce bit error rate in which MC-CDMA is multi user and multiple access schemes which is used to increase the data rate of the system. MC-CDMA system is a single wideband frequency selective carrier which converts frequency selective to par...

In this paper we analyze the performance of 2*3 MIMO-MC-CDMA system in MATLAB which greatly reduces BER by increasing the efficiency of system. MIMO and MCCDMA system arrangement is used to decrease bit error rate and also figure a new system called MC-CDMA which is multiple user and multiple access system used to enhance the performance of the system. MC-CDMA is a narrowband flat fading in cha...