This paper discusses antenna sub-set selection in multiple-input multiple-output wireless systems. The antennas are selected so as to maximize the channel capacity. We present a nearoptimal selection algorithm that enables tractable statistical analysis of the selection gain. We show that with antenna selection the capacity is statistically lower bounded by the capacity of a set of parallel ind...

We study the Narayana triangles and related families of polynomials. We link this study to Riordan arrays and Hankel transforms arising from a special case of capacity calculation related to MIMO communication systems. A link is established between a channel capacity calculation and a series reversion.

The tradeoff of spectral efficiency (b/s/Hz) versus energy-per-information bit is the key measure of channel capacity in the wideband power-limited regime. This paper finds the fundamental bandwidth–power tradeoff of a general class of channels in the wideband regime characterized by low, but nonzero, spectral efficiency and energy per bit close to the minimum value required for reliable commun...

Currently, the vast majority of mobile subscribers rely on secondgeneration mobile technologies, but service providers are investing into aggressive rollouts of mobile broadband networks to deliver a fully-featured wireless Internet. While the main focus in research has been put on enhancing the capacity of this kind of networks, very little has been done regarding their energy efficiency. On t...

D. J. Costello, Jr., “Free distance bounds for convolutional codes,” IEEE Trans. Inform. Theory, vol. IT-20, pp. 356-365, May 1974. M. Mooser, “Some periodic convolutional codes better than any fixed Code,” IEEE Trans. Inform. Theory, vol. IT-29, pp. 75G751, Sept. 1983. J. L. Massey, “Error bounds for tree codes, trellis codes, and convolutional codes with encoding, and decoding procedures,” CI...

The modulated scattering antenna array (MSAA) is composed of one normal antenna element and several modulated scattering elements (MSEs). In this report, a 2-element MSAA is used as the receiving antenna in 2 × 2 multiple input multiple output (MIMO) system. MIMO performance of MSAA with various array spacing is measured to investigate the relation between the array spacing and the MIMO perform...

This paper describes the effects of traffic distributions on uplink and downlink communications qualities in CDMA cellular systems. Many researches have been done from the viewpoint of the system capacity under ideal conditions in both uplink and downlink. However, there are few studies regarding traffic distributions that concurrently affect the uplink and downlink quality. The characteristics...

Multi-antenna transmission modes are an integral feature of the 3GPP LTE downlink. While these modes are well defined in the standard there are no restrictions on the choice of transmit and receive antennas. In order to investigate the impact of the basestation antenna configuration on the LTE open loop downlink, a measurement campaign, comparing horizontally and vertically spaced antenna confi...

Multiple antenna technologies have received high attention in the last few decades for their capabilities to improve the overall system performance. Multiple-input multiple-output systems include a variety of techniques capable of not only increase the reliability of the communication but also impressively boost the channel capacity. In addition, smart antenna systems can increase the link qual...

This is an introduction to Shannon’s Information Theory. It is more like a long note so that it is by no means a complete survey or completely mathematically rigorous. It covers two main topics: entropy and channel capacity. All related concepts will be developed in a totally combinatorial flavor. Some issues usually not addressed in the literature will be discussed here as well. Hopefully, it ...