Nowadays, multimedia streaming is a common service on the Internet including both fixed and mobile networks. The RTP protocol is usually used to transfer the media. The RTCP protocol is an accompanying protocol for the RTP and it is used for feedback transmission in order to control multimedia session behaviour. The issue is the bandwidth dedicated for the RTCP protocol. As defined in the RTP s...

Spectral efficiency presents the ultimate limit on data rate per unit bandwidth of a certain communication system. For direct sequence code division multiple access (DS-CDMA) systems the spectral efficiency has been derived in case of synchronous reception for optimal and linear multiuser receivers, flat fading and non-fading environments as well as single and multi-cell cellular networks. The ...

A multiple-input multiple-output (MIMO) wireless channel formed by antenna arrays at the transmitter and at the receiver offers high capacity and significant diversity. Linear precoding may be used, along with spatial multiplexing (SM) or space-time block coding (STBC), to realize these gains with low-complexity receivers. In the absence of perfect channel knowledge at the transmitter, the prec...

Spectral efficiency presents the ultimate limit on the data rate per unit bandwidth of a certain communication system. For the DS-CDMA systems spectral efficiency has been derived for optimal and linear multiuser receivers in case of synchronous reception, fading and non-fading environment as well as single and multi-cell cellular networks. The most pervasive model employed in all these analyse...

Cooperative multicast is an effective solution to address the bottleneck problem of single-hop broadcast in wireless networks. By incorporating with the random linear network coding technique, the existing schemes can reduce the retransmission overhead significantly. However, the receivers may incur large decoding delay and complexity due to the batch decoding scheme. In addition, the dependenc...

Channel knowledge at the transmitter can greatly improve the error probability of multi-input multi-output wireless communication system. Though receivers can obtain accurate channel estimates through training with pilot signals, transmitters can have only limited amount of the channel knowledge due to the limited rate of the feedback channel. One simple solution is the receiver quantizes the c...

The discussion of bit and power loading algorithms for Multiple Input Multiple Output (MIMO) systems often neglects the requirement of perfect channel state information to perform singular value decomposition. Especially in multi-carrier systems like Orthogonal Frequency Division Multiplex (OFDM) a vast amount of feedback is necessary to facilitate such a scheme. In this paper the combination o...

Abstract — In this paper, we design decision–feedback differential detection (DF–DD) schemes for channels with phase noise. If the DF–DD feedback filter is properly optimized, a performance similar to that of more complex, recently reported schemes based on multiple–symbol detection [1] and expectation maximization (EM) [2] can be achieved. However, it is also shown that an error floor is unavo...

In this work, we propose a feedback scheme to drive the packet recombination process at the network nodes in a collaborative Network Coding (NC) scenario. Our scheme addresses the issue of determining which symbols are more helpful at the receivers to recover the message and how to accordingly recombine the received packets at the intermediate nodes where the original symbols are not available....

This paper presents a simplified derivation of the structure and performance of the optimum diversity comhiner/decision feedback equalizers, previously derived by Balahan and Salz. O u r analysis is based on fundamental results of linear prediction and estimation theory. New closed-form expressions that benchmark the performance of these receivers in a two-hem slowly Rayleigh fading channel hav...