Due to its enormous bandwidth, MultiMode Fiber (MMF) seems the only medium able to offer a broadband multiservice system using Mode Group Diversity Multiplexing (MGDM) technique. As an Optical Multiple Input Multiple Output (O-MIMO) method, MGDM exploits efficiently the fiber bandwidth by spatial launching and reception, so that the capacity is increased. However, the propagation of modes in th...

We present a uniied analytical framework to determine the exact average symbol-error-rate (SER) of linearly modulated signals over generalized fading channels. The results are applicable to systems employing coherent demodulation with maximal-ratio combining multichannel reception. The analyses assume independent fading paths which are not necessarily identically distributed. In all cases the p...

In this paper, we propose a novel reception/transmission scheme for half-duplex base stations (BSs). In particular, we propose a half-duplex BS that employes in-band uplink-receptions from user 1 and downlink-transmissions to user 2, which occur in different time slots. Furthermore, we propose optimal adaptive scheduling of the in-band uplink-receptions and downlink-transmissions of the BS such...

A class of multicarrier systems was deened in 1] to study the eeect of the method of bandwidth allocation on coherent multiuser system performance over fading channels. In this paper, we extend our previous work to a military environment, where the system experiences some type of hostile jamming in addition to additive white Gaussian noise (AWGN). Using a novel closed form result for the error ...

A beamspace-time (BT) RAKE receiver is proposed for multiple access interference (MAI) suppression and multipath diversity reception in sectored wireless CDMA communications. The scheme involves three stages. First, a set of adaptive beamformers encompassing a prescribed angular sector is constructed on an antenna array, each providing effective suppression of out-of-sector MAI and reception of...

Diversity techniques for communications among sensors are very effective tool to increase reception quality and battery lifetimes. A well-known method to increase diversity in cooperative communications is sensor (relay) selection. However, sensor selection method may lead to the selection of the same (near) sensor for transmission over a long period. One of the alternative techniques to sensor...

Dual polarized antennas are traditionally characterized in terms of port-to-port isolation and coand cross-polar radiation patterns. In this paper we instead identify the critical parameter when the antenna is used as a sensor in a polarization diversity reception system. This turns out to be the fareld coupling between the two channels. We calculate the antenna output power correlation and div...

Abstract: We evaluate the performance of a multi-beam transmitter system in an indoor environment where a diversity receiver is employed. The system’s performance is evaluated under four new multi-line spot diffusing geometries and is compared with the performance of a single line of diffusing spots and with the conventional diffuse system (CDS). The performance is analysed under the influence ...

In this paper it evaluates the BER (bit error rate) performance of MIMO system. MIMO uses multiple transmitting antennas, multiple receiving antennas and the space time block codes to provide diversity. MIMO transmits signal encoded by space time block encoder through different transmitting antennas. These signals arrive at the receiver at slightly different times. Spatially separated multiple ...

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 ...