By Savo G Glisic
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Extra info for Advanced wireless communications : 4G technologies
16 shows the MT CDMA transmitter of the jth user for the CBPSK scheme and the power spectrum of the transmitted signal, respectively, where G MT denotes the j j j processing gain, NC the number of subcarriers, and C j (t) = [C1 C2 · · · C G MT ] the spreading code of the jth user. All of these schemes will be discussed in detail in Chapter 7. 5 Ultra wide band (UWB) signals For the multipath resolution in indoor environments a chip interval of the order of a few nanoseconds is needed. This results in a spread spectrum signal with bandwidth in the order of a few GHz.
27 2−6 . 22 Upper bounds to the soft ML decoding bit error probability of different convolutional codes of rate 1/2. 23 Upper bounds to the soft ML decoding bit error probability of different convolutional codes of rate 1/3. 27 2−5 . In other words, we ﬁnd that the efﬁciency of the Rc = 1/3 code is higher by a factor of two. 2. These results can be used for calculation of reconﬁguration efﬁciency for different types of code. 3 Systematic recursive convolutional codes Systematic convolutional codes generated by feed-forward encoders yield, in general, lower free distances than non-systematic codes.
17 Tree diagram for the (3, 1, 3) convolutional code. The boldface path corresponds to the input sequence 11011. The maximum value of Dr will be referred to as the reconﬁguration range and the maximum value of the gain g12 as the adaptation range. 1 Punctured convolutional codes /code reconﬁgurability The increase of complexity inherent in passing from rate l/n 0 to rate k0 /n 0 codes can be mitigated using so-called punctured convolutional codes. A rate k0 /n 0 punctured convolutional code can be obtained by starting from a rate l/n 0 and deleting parity check symbols.