This paper presents a performance evaluation of Space-Time Block Coding (STBC) employing a realistic mobile radio channel model in macrocellular and urban environment. The Bit Error Rate (BER) is computed by Monte-Carlo simulations in the down-link to evaluate its sensibility to channel correlation. We consider a horizontal uniform linear array at the Base Station (BS) formed by up to four ante...

Location finding for CDMA subscribers using an antenna m a y at the base station is studied in this paper. Two methods are considered for radio location that are based on time of arrival (TOA) and angle of arrival (AOA) measurements. For TOA estimates, a maximum likelihood algorithm and a practical structure are proposed when an antenna array is available. For AOA estimates, a least-squares (LS...

In the evolution of 2 generation mobile communication systems packet switched data transmission (e.g. GPRS/EGPRS in GSM Phase 2+) and circuit switched speech communication will be demanded in parallel. Directing nulls of the antenna pattern to active mobiles in the downlink beamforming process using antenna arrays at the base station may be useless in the case of packet data transmission. We sh...

The aim of this investigation is to realize a Butler matrix for a multibeam base station antenna dedicated to a U MTS application; this matrix has been realized with microstrip technology. The antenna associated with this application is a network of patches distributed in a tree structure and fed by electromagnetic coupling. The patch distribution structure used in this experiment allowed a g r...

There have been many theoretical and experimental investigations on polarization diversity reception characteristics at base stations. The diversity gain was evaluated based on the distribution of the instantaneous received power in these investigations. The mainstream mobile communication systems are shifting to standardized IMT-2000 systems and the W-CDMA system is one of them. The effect usi...

In this paper we present multiple antenna transmitter optimization (i.e., spatial pre-filtering) schemes that are based on linear transformations and transmit power optimization (keeping average transmit power conserved). We consider the downlink of a wireless system with multiple transmit antennas at the base station and a number of mobile terminals (i.e., users) each with a single receive ant...

The problem of meeting the proliferating demands for mobile telephony within the confinements of the limited radio spectrum allocated to these services is addressed. A multiple beam adaptive basestation antenna is proposed as a major system component in an attempt to solve this problem. This novel approach is demonstrated here by employing an antenna array capable of resolving the angular distr...

In this paper, a unified comparison of space-time architectures paired with scheduling algorithms is presented. We define a new performance metric, which encapsulates both the spectral and energy efficiency of the scheme and consider various types of space-time architectures, including space-time block coding and BLAST. We consider a scenario in whichK active data users, each of which is equipp...

Digital Audio Broadcasting (DAB) is a digital method of delivering radio services from base station to the receiver. The main aim of this paper is to get better reliability of DAB reception in mobile (moving) environment. DAB is very forceful in mobile environment, but in some situations, reception fails in certain spots due to undesired audio interruptions. Antenna diversity systems are consid...

Conventional trisectored cellular systems have not taken full advantages of antenna directivities to enhance frequency reuse efficiency. A novel Channel Alternation and Rotation (CAR) scheme is proposed to coordinate channel assignments with antenna directivities. CAR employs a multi-interval cellreuse layout. Each cell type is allocated extra channel set(s) to provide network designers the fle...