In [1], [3], the authors proposed two Fractionally Spaced (FS) Decision Feedback Equalising (DFE) receivers performing Single User Detection (SUD) or Joint Detection (JD) used in Non Cyclic Prefixed (NCP) Multi CarrierCDMA (MC-CDMA) schemes. The objective of this paper is to compare the performance of the above two equalising schemes, against a simpler receiver structure consisting by a single-...

Packet loss rates in wireless local area networks (WLANs) are highly dynamic and location dependent. Therefore, multicasting of compressed video streams over such networks requires significantly different error control approaches from those used over wired networks. This paper explores three different methods employed separately and in combination, to improve the quality of video delivery on WL...

This article focuses on the in-phase/quadrature (I/Q) imbalance problem in quadrature ΣΔ modulators (QΣΔM). In the literature, such quadrature modulators have been seen as a promising possibility for software defined radio (SDR) receivers, but matching the quadrature circuits is an inevitable problem for this kind of systems. In this article, an analytic closed-form model will be derived for a ...

Novel decision-feedback (DF) linear prediction (LP) receivers, which process multiple samples per symbol interval in conjunction with optimal sample combining, are proposed for differential space–time modulation (DSTM) over Rayleigh fast-fading channels. Performance analysis demonstrates that multisampling DF-LP receivers outperform their symbol-rate sampling counterpart in fast fading substant...

The presented paper considers the uplink transmission in base station (BS) cooperation schemes where mobile terminals (MTs) in adjacent cells share the same physical channel. We consider single-carrier with frequency-domain equalization (SC-FDE) combined with iterative frequency-domain receivers based on the iterative block decision feedback equalization (IB-DFE). We study the quantization requ...

For the transport of multicast video, the use of multi-layered coding is one of the most promising techniques. To avoid feedback implosion at the source due to the control packets returned by the receivers, the network has to implement packet merging at intermediate nodes. We propose in this paper the direct algorithm that performs the merging procedure in only one loop. This algorithm is optim...

In block transmission systems, transmitter-induced redundancy using finite-impulse response (FIR) filterbanks can be used to suppress intersymbol interference and equalize FIR channels irrespective of channel zeros. At the receiver end, linear or decision-feedback (DF) FIR filterbanks can be applied to recover the transmitted data. Closed-form expressions are derived for the FIR linear or DF fi...

Existing multicast control algorithms typically assume trust and free sharing of information among receivers. We believe that this is not tenable in the long term. We examine multicast congestion control under the constraints of distrust and privacy among receivers. We claim that despite these constraints, large-scale multicast congestion control in a heterogeneous environment is feasible. We d...

We systematically analyze the biased and unbiased minimum mean square error (MMSE) equalizers of finite as well as infinite length, with and without decision feedback sections. New closed-form expressions of optimum equalizer weights, the MMSE, and symbol error probabilities (SEP), solely in terms of channel response parameters and noise power, are derived for the above receivers. These new exp...

This paper contains a detailed description of the congestion control algorithm of TRAM, a tree-based reliable multicast protocol. This algorithm takes advantage of regular acknowledgements from the receivers that propagate back to the sender via the repair tree. This scalable feedback mechanism is used to collect receiver credits. Complementing the windowing mechanism, packet transmission is sm...