By John Rhoton
Ch. 1. advent -- Ch. 2. Networking -- Ch. three. Message constitution -- Ch. four. spine Topology -- Ch. five. Message move -- Ch. 6. listing carrier -- Ch. 7. safety -- Ch. eight. Heterogeneous Mail Networks -- Ch. nine. Summing It Up -- App. A. OSI Implementation -- App. B. X.400 instance -- App. C. MIME instance -- App. D. POP3 instance -- App. E. SMTP Header -- App. F. MAILbus four hundred structure
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Additional info for X.400 and SMTP : battle of the E-Mail protocols
07, or over seven times that at the nominal operating point. 15 IP Design for Mobile Networks 100 10–1 10–2 Bit Error Rate 16 10–3 10–4 10–5 10–6 QPSK (Non-Differential Data Encoding) 16 QAM 64 QAM 256 QAM 0 5 15 10 20 25 Eb/N0 (dB) Figure 1-10 BER Performance in AWGN of Different Modulation Schemes Now, if instead the modulation is decreased from 256 QAM to 64 QAM while keeping the symbol energy constant, since Eb/No is a normalized measure of the energy per symbol to noise spectral density ratio, there will a corresponding increase in Eb by a factor of: Log2 M where M is the number of alternative modulation symbols.
The chapter describes how cellular access systems have traditionally decomposed functionality between radio base station elements and base station controller equipment, with legacy Time-Division Multiplexing (TDM) or Asynchronous Transfer Mode (ATM)-defined interfaces between the two. The chapter then describes how IP is fundamentally impacting these access systems in two distinct ways, as follows: ■ IP in the transport network: Access System interfaces are increasingly being defined using IP protocols and thus the significance of IP in the transport network is increasing.
The contribution from all the correlator receivers are then combined (using a Rake receiver) in order to leverage the energy dispersed over different multipath components. 29 30 IP Design for Mobile Networks ■ Using systems of parallel tone modems: In OFDMA systems, the information to be transmitted is converted into a large number (N) of parallel streams. Each stream is used to modulate a narrow band subcarrier, with the overall transmission being comprised of N finely spaced subcarriers. The effective symbol rate of each of the subcarriers is decreased by a factor of N, resulting in the symbol duration being increased by a factor of N.
X.400 and SMTP : battle of the E-Mail protocols by John Rhoton