Zobrazeno 1 - 10
of 160
pro vyhledávání: '"Joachim Speidel"'
Publikováno v:
Sensors, Vol 19, Iss 21, p 4793 (2019)
This paper presents cooperative transmission (CT), where multiple relays are used to achieve array and diversity gains, as an enabling technology for Internet of Things (IoT) networks with hardware-limited devices. We investigate a channel coding aid
Externí odkaz:
https://doaj.org/article/898b28eb5f6843849ba48726f29dfc7a
Publikováno v:
IEEE Transactions on Green Communications and Networking. 3:288-301
In secure spatial modulation systems, an active antenna-group (AAG) selection of maximizing the average secrecy rate (SR) is proposed to avoid the disadvantage that conventional AAG selection scheme of minimizing bit error ratio at desired receiver m
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::1b7872cfba61b915c6cdf12e4126ff3e
https://doi.org/10.1109/tgcn.2019.2898442
https://doi.org/10.1109/tgcn.2019.2898442
Autor:
Joachim Speidel
Publikováno v:
Signals and Communication Technology ISBN: 9783030673567
Signals and Communication Technology ISBN: 9783030005474
Signals and Communication Technology ISBN: 9783030005474
We have already discussed the time-variant impulse response w(t, s) and the delay spread function \(g(t,\tau )\), which characterize a linear time-variant system completely and hence are called system functions. Now we will see that the latter provid
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::48aa51cbb3c64410917ae5cddf96e944
https://doi.org/10.1007/978-3-030-67357-4_11
https://doi.org/10.1007/978-3-030-67357-4_11
Autor:
Joachim Speidel
Publikováno v:
Signals and Communication Technology ISBN: 9783030673567
In the following we consider channels, which can be modeled by a causal impulse response with finite duration, what we call finite impulse response (FIR) \(h(n)={\left\{ \begin{array}{ll}\begin{array}{ccc} h_{n} &{} ; &{} n=0,1,\ldots ,L\\ 0 &{} ; &{
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::3ee93cfc47154f42bc3865c0f65a956b
https://doi.org/10.1007/978-3-030-67357-4_6
https://doi.org/10.1007/978-3-030-67357-4_6
Autor:
Joachim Speidel
Publikováno v:
Signals and Communication Technology ISBN: 9783030673567
Signals and Communication Technology ISBN: 9783030005474
Signals and Communication Technology ISBN: 9783030005474
In the following sections, we introduce the principles of signal transmission over a Multiple Input Multiple Output (MIMO) channel and emphasize on wireless links. We will derive a block diagram of a MIMO system and compact it using the concept of th
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a440e29e0185c5078eb4691e12fb65e3
https://doi.org/10.1007/978-3-030-67357-4_13
https://doi.org/10.1007/978-3-030-67357-4_13
Autor:
Joachim Speidel
Publikováno v:
Signals and Communication Technology ISBN: 9783030673567
Signals and Communication Technology ISBN: 9783030005474
Signals and Communication Technology ISBN: 9783030005474
Hitherto, we have considered signals and characteristic functions of time-variant system, in particular, the delay spread function \(g(t,\tau )\), as deterministic. With the Fourier transform different spectra or transfer functions, such as the Doppl
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a6b27c0f88d41e50ec1b00670e802c40
https://doi.org/10.1007/978-3-030-67357-4_12
https://doi.org/10.1007/978-3-030-67357-4_12
Autor:
Joachim Speidel
Publikováno v:
Signals and Communication Technology ISBN: 9783030673567
Signals and Communication Technology ISBN: 9783030005474
Signals and Communication Technology ISBN: 9783030005474
In this chapter, we allude to a topic which is important for the design of a communications system. We will answer the question how many bit/s can be transmitted per symbol or equivalently per channel use. For a certain bandwidth of the channel, the
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::cfb1298099e9a5ce33de149f773ee3a5
https://doi.org/10.1007/978-3-030-67357-4_17
https://doi.org/10.1007/978-3-030-67357-4_17
Autor:
Joachim Speidel
Publikováno v:
Signals and Communication Technology ISBN: 9783030673567
Signals and Communication Technology ISBN: 9783030005474
Signals and Communication Technology ISBN: 9783030005474
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::103daa4ca9186b8c67c5bda00bf4bb2a
https://doi.org/10.1007/978-3-030-67357-4_3
https://doi.org/10.1007/978-3-030-67357-4_3
Autor:
Joachim Speidel
Publikováno v:
Signals and Communication Technology ISBN: 9783030673567
Signals and Communication Technology ISBN: 9783030005474
Signals and Communication Technology ISBN: 9783030005474
Figure 23.1 shows the principle block diagram of a MIMO transmitter with space-time encoding. The incoming bit sequence b(n) is fed into the QAM mapper, which periodically maps \(\kappa \) consecutive bits to a QAM symbol \(c(k')\), constituting a \(
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d8f4c62cfffa04ea87871339a19035e1
https://doi.org/10.1007/978-3-030-67357-4_19
https://doi.org/10.1007/978-3-030-67357-4_19
Autor:
Joachim Speidel
Publikováno v:
Signals and Communication Technology ISBN: 9783030673567
Signals and Communication Technology ISBN: 9783030005474
Signals and Communication Technology ISBN: 9783030005474
In this chapter, we allude to a topic which gives quite some insights into the functionality of an MIMO system. As we have seen, the MIMO channel matrix \(\mathbf {H}(k)\) introduces interchannel interference to the received signal $$\begin{aligned}
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::7b05e0adcf763fb251640a5e3f0600fd
https://doi.org/10.1007/978-3-030-67357-4_16
https://doi.org/10.1007/978-3-030-67357-4_16