As wireless sensor networks are constituted of nodes with limited life batteries, energy efficiency is a very important metric at all levels of system design. Therefore, performing optimal modulation schemes is a crucial task at the physical layer of this class of networks. This paper investigates the best modulation strategy to minimize the total energy consumption required to send a given num...

Using this assumption, the Bit Error Rate BER for BPSK, QPSK, 4PAM. The same case is between 64QAM and 16 QAM6db difference. Http:www.nxp.comacrobatdownloadapplicationnotesAN970471.pdfSince this scheme depends on the difference between successive phases, it is. In this latter case, the BER of QPSK is exactly the same as the BER of BPSK.Conditional pdf. Encode the information in phase difference...

A V-band receiver using a MHMIC multiport circuit is presented in this paper. The millimeterwave frequency conversion is performed using a passive circuit, the multiport, and related power detectors, avoiding the conventional millimeter-wave active costly mixers. Basically, the multiport circuit is an additive mixer in which the resulting sum of millimeter-wave signals is nonlinearly processed ...

The technique of SNR estimation is one of the key technologies in adaptive frequency hopping system. The methods of channel quality estimation for nonlinear continuous phase modulation (CPM) signals have some limitations. Therefore, the algorithm of channel quality estimation for CPM signals is worthy of further study. Some similar phase characteristics between sampling CPM and MPSK motivate us...

Receive antenna selection (AS), in which a subset of a receiver’s antennas, is selected based on the instantaneous channel condition, enables the receiver to benefit from having multiple antenna elements despite using significantly less hardware. However, the limited hardware resources also impose unique constraints on how channel state information, which is necessary to select the antennas and...

New exact expressions are derived for the symbol error rate (SER) of M-ary quadrature amplitude modulation (MQAM) and the bit error rate (BER) of M-ary phase shift keying (MPSK) for L diversity reception in Rayleigh fading channels corrupted by additive white Gaussian noise (AWGN). The diversity techniques considered here are maximum ratio combining (MRC) and selection combining (SC). MRC with ...

We consider a hybrid selection/maximal-ratio combining (HS/MRC) diversity system and assume independent Nakagami fading on the diversity branches with unequal fading parameters and unequal signal-to-noise ratios (SNR’s). We use the virtual branch technique and two series expressions for the characteristic function (CF) of the sum of independent gamma random variables to derive closed-form expre...

In Cooperative Wireless Communication, system performance decreases due to the improper estimation of the channel. We analyzed MIMO-STBC based Decode and Forward (DF) Cooperation Communication System, considering the effect of error, arises due to the improper estimation of channel. We have considered Decode Forward (DF) based MIMO Space Time Block Code (STBC) Cooperative Communication Network ...

It is well known that classical differential detection of MPSK signals, wherein the information is encoded as the first order phase difference, is a simple and robust form of communication in environments not subject to frequency variation. For channels that introduce into the carrier a random frequency shift, eg., those associated with moving vehicles, classical differential detection as above...

This paper focuses mainly on Bit Error Rate(BER) and Signal to Noise Ratio(SNR).To analyse the system’s performance probability of error plays a major role. Each modulation technique has its own performance while dealing with signals corrupted with noise. This paper describes the comparative analysis of basic M-ary Phase Shift Keying modulation schemes like BPSK, QPSK,8-PSK and 16-PSK. It gives...