Download 4G LTE/LTE-Advanced for Mobile Broadband by Erik Dahlman, Stefan Parkvall, Johan Sköld PDF

By Erik Dahlman, Stefan Parkvall, Johan Sköld

Achieve perception into 3GPP’s most up-to-date common liberate eleven on LTE/LTE complex and the way unencumber 12 is developing

To stream to higher-speed networks which can cater to patron call for for cellular broadband multimedia purposes, the 3GPP has constructed the most recent LTE-Advanced (LTE unlock 10) commonplace, for you to be fastened in December 2010. This e-book makes a speciality of LTE and LTE-Advanced, and offers engineers with actual perception and figuring out into the why and the way of the traditional and its similar applied sciences. This e-book is written through engineers from Ericsson--the world's major telecommunications supplier--who used to be seriously serious about the advance of the traditional.

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At the same time, if sufficient received signal power can be made available, basically any data rate can, at least in theory, be provided within a given limited bandwidth. l In the case of low-bandwidth utilization – that is, as long as the radio-link data rate is substantially lower than the available bandwidth – any further increase of the data rate requires approximately the same relative increase in the received signal power. This can be referred to as power-limited operation (in contrast to bandwidth-limited operation; see below) as, in this case, an increase in the available bandwidth does not substantially impact what received signal power is required for a certain data rate.

Different more or less advanced algorithms can be used for the channel estimation, ranging from simple averaging in combination with linear interpolation to Minimum-Mean-Square-Error (MMSE) estimation relying on more detailed knowledge of the channel time/frequency-domain characteristics. Readers are referred to, for example, [17] for a more in-depth discussion on channel estimation for OFDM. 12 Time–frequency grid with known reference symbols. 13 (a) Transmission of single wideband carrier. (b) OFDM transmission over a frequency-selective channel.

The use of 16QAM thus allows for up to 4 bits of information to be communicated per symbol interval. 2c), with 64 different signaling alternatives, allows for up to 6 bits of information to be communicated per symbol interval. At the same time, the bandwidth of the transmitted signal is, at least in principle, independent of the size of the modulation alphabet and mainly depends on the modulation rate – that is, the number of modulation symbols per second. The maximum bandwidth utilization, expressed in bits/s/Hz, of 16QAM and 64QAM are thus, at least in principle, two and three times that of QPSK respectively.

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