Acm - Physical Layer Design For A Spread Spectrum Wireless by GuoliangLi

By GuoliangLi

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11. A comparison of these figures shows that the Barker code has ideal partial correlation and periodic autocorrelation functions. From the periodic autocorrelation function, we find that the 63-bit code is actually a M-sequence code. Although its periodic autocorrelation is impulse-like as desired, its partial correlation will introduce noise into the acquisition circuit. Thus, we conclude that the Barker code is optimum for preamble and data spreading, but is processing-gain-limited, and that the M-sequence code is optimum only for data spreading.

The same number of data bits and iterations were carried out as in the first series of simulations. 24 shows this simulation result. Interestingly, the resulting BER performance is also close to the theoretical one. This means that the quantization effect can be ignored based on the current simulation model. One explanation is that white Gaussian noise, even at Eb /No equal to 9 dB, is much greater than the quantization noise so that the quantization noise can be neglected. A third simulation was done to study the performance of the symbol tracking scheme suggested by Zilog.

Since the code is written in block format, the integration will not take great effort as long as the input and output interfacing is matched. 22. It is almost the same as the Z2000 internal block diagram except that the modulation and demodulation blocks are removed. The more detailed descriptions of the simulation environment, the realization of these blocks and also the commented code written in MATLAB are included in Appendix B. 50 CHAPTER 4. 22: Simulation Block Diagram In the current stage of simulation, we have not included a model for the frequency tracking loop.

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