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Differential impulse radio employing autocorrelation receivers (AcR) is an efficient, low-complexity technology for short range wireless ultra wide-band (UWB) communications. However, existing systems are based on single transmit and single receive antennas. To enhance system capacity, this paper extends the technique to multiple-input multiple-output (MIMO) systems. The resulting system is capable...
Studies on differential unitary space-time modulation are mostly focused on Rayleigh fading channels. In this paper we present new analytic results for the maximum-likelihood demodulator (MLD) and the standard differential demodulator (SDD). The resulting expressions and bounds on the pairwise error probability shed light on the impact of various system parameters and are helpful towards a deeper...
This paper presents a downlink performance analysis of a link adaptation (LA) algorithm applied to a MIMO-OFDM physical layer (PHY) which is a popular candidate for future generation cellular communication systems. The new LA algorithm attempts to maximize throughput and adaptation between various modulation and coding schemes in combination with both space-time block codes (STBC) and spatial multiplexing...
Recently, a variety of full-rate, full-diversity quasi-orthogonal space-time block codes (QO-STBCs) have been designed. Though the quasi-orthogonality does reduce the decoding complexity from order of MQN to MQN/2 for Q-ary QAM modulation with N transmit and M receive antennas, there is still need for improvement. Several simple suboptimum decoding algorithms were proposed but suffer quite severe...
A new multilevel coding (MLC) scheme invoking sphere packing (SP) modulation is proposed, where the SP arrangement is jointly designed with a space time block code (STBC) for the sake of attaining an additional space diversity gain. An iterative multistage decoding (MSD) aided multilevel sphere packing demodulator is proposed for attaining a high decoding performance at a low decoding complexity,...
The following topics are discussed: MIMO channel modeling and measurements, antenna arrays,space time coding, antenna selection, beamforming and array processing,MIMO-OFDM, radio access, MC-CDMA, multicarrier systems,UWB channel modeling and estimation,3G,game theoretic approaches,cellular planning and management, resource allocation, source and channel coding,MAC for ad hoc networks, WLAN and WIMAX.
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