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Due to the rapidly changing topology of vehicular ad hoc network (VANET), it requires the routing protocol can be able to find out comparatively more stable routes. But the routing protocols in existence are not taking the distinguishing features of vehicles and roadway into consideration, and this brought about challenges to these routing protocols' applicability in VANET. In this paper, we take...
This paper is to critically analyze one of the Fix Mobile Convergence (FMC) solutions which the third generation partnership project(3GPP) has also included in its Release 6 i.e. Generic Access Network(GAN) formally called Unlicensed Mobile Access(UMA). This article analyzes the potential influence and risks on the existing mobile cellular networks which is pulled in by UMA/GAN technique and presents...
The downlink minimum bit error rate (MBER) transmit beamforming is directly derived based on the uplink MBER receive beamforming for time division duplex (TDD) space-division multiple-access (SDMA) multiple-input multiple-output systems, where the base station (BS) is equipped with multiple antennas to support multiple single-antenna mobile terminals (MTs). It is shown that the relationship between...
An iterative detection aided down-link (DL) space division multiple access (SDMA) system is proposed. The base station (BS) requires DL channel state information (CSI) estimated by and fed back from the mobile station (MS) for separating the DL signals to be transmitted to the MSs from the BS. We investigate the achievable system performance subject to finite-accuracy CSI feedback. The achievable...
In this paper, we propose and investigate a relay-diversity transmission scheme for the direct-sequence code-division multiple-access (DS-CDMA) downlink, where each (destination) mobile terminal (MT) is aided by a cluster of relays to achieve the relay diversity. In the considered system, downlink multiuser interference (MUI) is suppressed with the aid of transmitter preprocessing operated at the...
In this contribution we investigate the bit-error-rate (BER) performance of a downlink direct-sequence code-division multiple-access (DS-CDMA) system, where a set of relays are chosen to assist a mobile terminal (MT) in order to improve its communications reliability with the base-station (BS). In our relay-aided DS-CDMA system, the downlink signal is detected at the relays based on the minimum mean-square-error...
This contribution considers joint transmitter-receiver design in general multiuser multiple-input multiple-output (MIMO) systems, where uplink and downlink use time-division duplex (TDD). We assume that there exist multiuser interference as well as other jamming signals in the system. The optimization strategy considered in this contribution represents one of the applications of the theory proposed...
A multiple-input multiple-output (MIMO) space-division multiple-access (SDMA) system is presented and investigated, when the space-time block coded (STBC) user signals are transmitted over Rayleigh fading channels. In the proposed SDMA system each mobile uses two transmit antennas, while the base-station (BS) receiver employs multiple receive antenna arrays and each receive antenna array consists...
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