Study of a frequency diversity system for indoor digital TV

Varela, Mercedes Sánchez; Sanchez, M.G.

doi:10.1109/11.868933

Cited by 4 publications

(1 citation statement)

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“…As an alternative, we could employ frequency diversity techniques [10,11], where different replicas of the intended signal are transmitted at different frequency bands. With these techniques it is easy to have a large diversity order, with almost uncorrelated channels, provided that their frequency separation is much higher than the coherence bandwidth of the propagation channel (for broadband wireless systems, the channel is usually strongly frequency selective and the coherence bandwidth can be a small fraction of the symbol rate).…”

Section: Introductionmentioning

confidence: 99%

A spectrally efficient frequency diversity technique for single‐carrier modulations with frequency division multiplexing

Araujo¹,

Dinis²

2009

Trans Emerging Tel Tech

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SUMMARYWhen the number of relevant propagation paths between the transmitter and the receiver is small and/or when they are not separable (i.e. the difference between the corresponding delays is smaller than the symbol duration), we can have deep fading effects and poor performance, especially for slow-varying channels. In this case, the use of diversity techniques is strongly recommendable.In this paper, we consider an single-carrier-based (SC) block transmission, employing frequency domain equalisation (FDE) receivers and we present a frequency diversity technique that allows high spectral efficiencies. As with conventional frequency diversity techniques, L replicas of a given signal are transmitted at L different frequencies. However, contrarily to conventional frequency diversity schemes, up to L users can share this set of L frequency bands. Since this leads to strong interference levels, we propose an iterative, frequency-domain receiver where all the users sharing the L frequencies are jointly detected.Our performance results show that the proposed frequency diversity scheme allows high diversity gains, while keeping the spectral efficiency of conventional SC schemes. Moreover, we can cope with channels that can be severely time-dispersive and/or can have deep fading effects.

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Section: Introductionmentioning

confidence: 99%