By Samuel C. Yang
CDMA2000 is of serious curiosity to instant communications execs simply because this 3G (third iteration) ordinary presents for swifter information premiums, always-on information provider, and more desirable voice community skill. Breaking down advanced expertise into easy-to-understand suggestions, this hands-on, system-level source bargains RF (radio frequency) and instant process engineers professional suggestions in designing, optimizing, and working a CDMA2000 instant community.
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Additional info for 3G CDMA2000 : wireless system engineering
0368 Mbps 6 data rates. For a given radio configuration, data rates lower than the maximum are possible. Radio Configuration 1 and Radio Configuration 2 are backward compatible with IS-95 in that they are equivalent to Rate Set 1 and Rate Set 2 of IS-95. In fact, Radio Configurations 1 and 2 differ from the rest of the radio configurations in that Radio Configurations 1 and 2 use the 64-ary orthogonal modulation to be compatible with IS-95, while Radio Configurations 3 through 6 use the coherent binary phase shift keying (BPSK).
In addition, because the R-EACH is coherently modulated, a reverse pilot is transmitted at the same time to aid in its coherent demodulation at the base station. 8 show the different types of R-EACH transmissions. Similar to the R-CCCH transmission, the R-EACH preamble consists of a series of gated reverse pilot channel transmissions. The mobile transmits the reverse pilot during preamble at a higher power to facilitate acquisition of the R-EACH. For the preamble, the duration of the gated transmissions t1, the duration of the off time t3, the duration of the last gated transmission t2, the total number of gated transmissions (N + 1), and the total duration of the preamble Tpreamble are completely specified by the appropriate R-EACH parameters.
This is important because each base station sector is uniquely identified by its short PN code offset. 15 shows how the I and the Q symbols are channelized and spread in a complex manner. 15 may look complex at first, it is really just a way to diagrammatically implement the multiplication of two complex numbers. 14 Conceptual block diagram of forward dedicated control channel, forward fundamental channel, and forward supplemental channel5. 5. Forward supplemental channel does not have punctured power control bits.
3G CDMA2000 : wireless system engineering by Samuel C. Yang