An expression for the true variance of the P powerlaw phase estimator, as the number of samples approaches infinity, is given. This expression is an extension to the linear approximation of Moeneclaey and de Jonghe [1] which is known to be inadequate in some practical systems. Our new expression covers general 2π/P-rotationally symmetric constellations that include those of PAM, QAM, PSK, Star ...

It is usually assumed that N samples of the time domain orthogonal frequency division multiplexing (OFDM) symbols have an identical Gaussian probability distribution (PD) in the real and imaginary parts. In this article, we analyze the exact PD of M-QAM/OFDM symbols with N subcarriers. We show the general expression of the characteristic function of the time domain samples of M-QAM/OFDM symbols...

Low cost video sensors used for streaming signals to help firefighters, require high bit rate due uncompressed images. To increase spectral efficiency given a limited bandwidth, very order constellations in signal noise ratio regimes can be used. However, is not the only factor effecting constellations. These are also sensitive hardware impairments and system non-linearities. Therefore, this pa...

313 that the best 8-ary constellation is either the 8-PSK, or 8-cross, or (1; 7) depending on the desired spectral efficiency. As for the case of 16-ary constellations, the most attractive signal set is rectangular 16-QAM for all spectral efficiencies of practical interest. These results have been confirmed by computer simulations of BICM schemes combining turbo codes and several signal sets. T...

QUAL COMM Israel. rror correction codes come in two flavors: block codes and convolutional codes. The most popular method of combining modulation and coding has been termed trellis coded modulation [ l ] (or more simply trellis codes). Pragmatic trellis codes were introduced in a previous IEEE Communications Magazine article [2] whereby the encoders and decoders for trellis codes were obtained ...

In this article we have described and simulated new SIR-frame based link adaptation algorithms. Algorithms were designed to increase efficiency of data transmission among user equipment and base stations (uplink). Simulation results of hybrid adaptation (power and modulation BPSK, QPSK, 16-QAM, 64-QAM) are compared and expressed as data throughput and outage probability for different simulation...

Orthogonal Frequency Division Multiplexing (OFDM) is of the strong prospects as a future wireless communication system. Improved spectral efficiency has been found in OFDM based on DFT, has a good orthogonality but inter symbol interference (ISI) and inter carrier interference (ICI) degrade the performance. ISI and ICI can be improved by using cyclic prefix (CP). About 20% of bandwidth is consu...

In this paper, multilevel coded asymmetric modulation with multistage decoding and unequal error protection (UEP) is discussed. These results further emphasize the fact that unconventional signal set partitionings are more promising than traditional (Ungerboeck-type) partitionings, to achieve UEP capabilities with multilevel coding and multistage decoding. Three types of unconventional partitio...

In this report the use of photonic techniques in the application of high capacity wireless links in the millimeter wave frequency range is addressed. A novel technique called the photonic vector modulation has been proposed, and generation of advanced modulation like 16-QAM upto a capacity of 10 Gb/s in the millimeter wave frequency has been studied and experimentally demonstrated. Several arch...

In this paper, symbol error probability (SEP) for generalized selection combining (GSC) reception of M-ary quadrature amplitude modulation (M-QAM) signals in a block frequency-flat Rayleigh fading channel is considered. The paper presents a closed-form approximate SEP expression for GSC reception of M-QAM signals in the fading channel. The SEP expression is explicit and simulation results valid...