Department of Engineering 2022 7CCEMMPC Mobile and Personal Communication Systems Coursework 1 Introduction This is the first (of two) pieces of coursework and is worth 15% of the module mark. It tests your ability to solve problems based on the material in the first half of the module. You should solve each of these questions showing and explaining your method clearly. You should submit a single PDF containing your answers, working, derivation and clearly explaining your assumptions and method. The maximum document size should be 5-pages. This may be a scanned hand-written document. The deadline for submissions is 23rd February (within the submission window). For students with unforeseen circumstances, you can submit a mitigating circumstances form via student records. Note that I cannot grant extensions or modifications to assessments. For support with the assessment, you may ask clarification questions via the forum and my office hours are Mondays from 10AM to 12PM. Coursework 1 Questions Question 1) Derive a simple expression for the capacity (number of users per cell) of a CDMA cellular mobile system, assuming it employs a perfect power control scheme and the effect of thermal noise on the capacity of the system is negligible. (40 marks) Question 2) A Direct Sequence-Code Division Multiple Access (DS-CDMA) cellular mobile system uses Quadrature Phase Shift Keying (QPSK) modulation having raised-cosine shaped filtering with roll-off factor of 0.22. Its base stations are equipped with 3-sector antennas. The user data rate is 32 Kb/s, spreading factor is 128, voice activity factor is 1, and inter-cell-to-intra-cell interference power ratio is 1/2. If a desired bit error rate per user of 10-3 is required, calculate how many users one cell can serve. Assume that the effect of thermal noise on the number of users is negligible. (60 marks)
