Comparison of OQPSK and CPM for Communications at 60 GHz with a Nonideal Front End

Nsenga, Jimmy; Thillo, Wim Van; Horlin, François; Bourdoux, André; Lauwereins, Rudy

doi:10.1155/2007/86206

Cited by 19 publications

(10 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Worldwide, recent regulation assigned a 3 GHz or wider frequency band at 60 GHz to this kind of applications [1]. Continuous phase modulation (CPM) has been proposed as an attractive modulation technique for 60 GHz communications in [2], [3] and [4] and in the IEEE 802. 15.3c standardization committee.…”

mentioning

confidence: 99%

Low-complexity linear frequency domain equalization for continuous phase modulation

Thillo

Horlin

Nsenga

et al. 2009

IEEE Trans. Wireless Commun.

Self Cite

View full text Add to dashboard Cite

Abstract-In this paper, we develop a new low-complexity linear frequency domain equalization (FDE) approach for continuous phase modulated (CPM) signals. As a CPM signal is highly correlated, calculating a linear minimum mean square error (MMSE) channel equalizer requires the inversion of a nondiagonal matrix, even in the frequency domain. In order to regain the FDE advantage of reduced computational complexity, we show that this matrix can be approximated by a block-diagonal matrix without performance loss. Moreover, our MMSE equalizer can be simplified to a low-complexity zero-forcing equalizer. The proposed techniques can be applied to any CPM scheme. To support this theory we present a new polyphase matrix model, valid for any block-based CPM system. Simulation results in a 60 GHz environment show that our reduced-complexity MMSE equalizer significantly outperforms the state of the art linear MMSE receiver for large modulation indices, while it performs only slightly worse for small ones.Index Terms-Continuous phase modulation (CPM), frequency domain equalization (FDE), minimum mean square error (MMSE) equalization, complexity reduction, polyphase representation

show abstract

mentioning

confidence: 99%

Low-complexity linear frequency domain equalization for continuous phase modulation

Thillo

Horlin

Nsenga

et al. 2009

IEEE Trans. Wireless Commun.

Self Cite

View full text Add to dashboard Cite

show abstract

“…The radio wave propagation at 60 GHz suggests the existence of a strong line-of-sight (LOS) component as well as the multi-cluster multi-path components because of the high path loss and inability of diffusion [3,4]. Such a near-optical propagation characteristic also suggests a 3-D ray-tracing technique in channel modeling (see Figure 1), which is detailed in [12].…”

Section: System Description and Problem Formulationmentioning

confidence: 99%

“…The 60 GHz millimeter wave communication has received significant recent attention, and it is considered as a promising technology for short-range broadband wireless transmission with data rate up to multi-giga bits/s [1][2][3][4]. Wireless communications around 60 GHz possess several advantages including huge clean unlicensed bandwidth (up to 7 GHz), compact size of transceiver due to the short wavelength, and less interference brought by high atmospheric absorption.…”

Section: Introductionmentioning

confidence: 99%

Adaptive antenna selection and Tx/Rx beamforming for large-scale MIMO systems in 60 GHz channels

Dong

Prasad

Wang

et al. 2011

J Wireless Com Network

View full text Add to dashboard Cite

We consider a large-scale MIMO system operating in the 60 GHz band employing beamforming for high-speed data transmission. We assume that the number of RF chains is smaller than the number of antennas, which motivates the use of antenna selection to exploit the beamforming gain afforded by the large-scale antenna array. However, the system constraint that at the receiver, only a linear combination of the receive antenna outputs is available, which together with the large dimension of the MIMO system makes it challenging to devise an efficient antenna selection algorithm. By exploiting the strong line-of-sight property of the 60 GHz channels, we propose an iterative antenna selection algorithm based on discrete stochastic approximation that can quickly lock onto a nearoptimal antenna subset. Moreover, given a selected antenna subset, we propose an adaptive transmit and receive beamforming algorithm based on the stochastic gradient method that makes use of a low-rate feedback channel to inform the transmitter about the selected beams. Simulation results show that both the proposed antenna selection and the adaptive beamforming techniques exhibit fast convergence and near-optimal performance.

show abstract

“…The workhorse of communication in this new design is a directional, beam-formed 60 GHz RF communication channel characterized by high bandwidth (4 − 15 Gbps) and short range (≤ 10 meters). New 60 GHz modems [39,37] based on standard 90nm CMOS technology make it possible to realize such channels with low cost and high power efficiency (< 1W). Directional (25 • -60…”

Section: Introductionmentioning

confidence: 99%

On the feasibility of completely wireless datacenters

Shin

Sirer

Weatherspoon

et al. 2012

Proceedings of the Eighth ACM/IEEE Symposium on Architectures for Networking and Communications Systems

View full text Add to dashboard Cite

We introduce a novel data center design based on emerging 60 GHz RF technology that uses wires only to deliver power to its server nodes. Fundamental limitation of wireless data centers is that the maximum number of live connections in the network is directly proportional to the full volume occupied by the data center divided by the radiating volume of a single antenna beam. Consequently, we integrate wireless transceivers and switching logic within each server node and collocate them in cylindric racks to establish a semi-regular mesh topology. Our exploration of the resulting design space shows that while attaining comparable bandwidth, our wireless data center exhibits substantially higher fault tolerance, improved latency, lower power consumption, and easier maintenance than a conventional wired data center.

show abstract

Comparison of OQPSK and CPM for Communications at 60 GHz with a Nonideal Front End

Cited by 19 publications

References 21 publications

Low-complexity linear frequency domain equalization for continuous phase modulation

Low-complexity linear frequency domain equalization for continuous phase modulation

Adaptive antenna selection and Tx/Rx beamforming for large-scale MIMO systems in 60 GHz channels

On the feasibility of completely wireless datacenters

Contact Info

Product

Resources

About