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From: Bernice Jacinth on 14 Feb 2010 12:24 Hello, Greetings.I am undergraduate engineering student.I had sent an IEEE paper on "Interference reduction for terrestrial Cellular based systems via High Altitude platform Station" to a nearby institution.This has been selected for presentation and now i am asked for the MATLAB coding for this paper.I could not find it in Internet.Please help me...Kindly mail the algorithm of MATLAB coding or Code to bjacinth(a)gmail.com. The outline of the problem is A. Single Integrated System: In a cellular CDMA system, uplink capacity is limited by interference. For a ground-based CDMA system or a HAPS CDMA system the interference is contributed by users in the same cell and in other cells. The other-cell interference factor for a HAPS CDMA system is lower than that for a ground-based CDMA system. The interference may in addition be contributed by users in other systems. The intersystem (or the other-system) interference impairs the uplink capacity, though several techniques. To avoid the intersystem interference, it is proposed in this paper that a HAPS and a terrestrial cellular system are combined into a single integrated system, as shown in Fig. 1. We consider a HAPS operating at an altitude of 20 km. A phased array multibeam antenna onboard the HAPS illuminates a service area with equally sized circular cells of radius R, where the same service area is also covered by a number of terrestrial BSs. When a call is made, its uplink signal is received by two serving antennas: one is at the HAPS and another at the terrestrial BS. Then, the signals collected from two separate paths are combined and demodulated by a receiver at the terrestrial BS. In this paper, we assume that the received signal transmitted from the HAPS to terrestrial BSs is performed in millimetre wavebands using high gain directional antennas, and the transmission is ideal without additional loss. B. New Cell Structure In a doughnut-cell system, each terrestrial cell is divided into two regions, where the boundary is found by equating the average path losses of terrestrial links and of HAPS links. If a user’s location is inside the boundary, the user is served by the terrestrial BS, as the path loss of the terrestrial link is smaller. On the contrary, a user is served by the HAPS BS if the user locates outside the boundary. Thus, because the required transmitting power for each user is reduced, less interference will be produced. Motivated by this idea, we propose a new cell structure, as depicted in Fig. 2 for the number of tiers N = 2. Each cell of radius R is both covered by a terrestrial BS and three beams projected from the HAPS, where the main beams are separately pointed toward three corners of the cell; e.g., H1, H2, and H3 in Fig. 2. The cells surrounded by solid lines are the coverage areas of terrestrial BSs, and those surrounded by dotted lines denote the coverage areas of the main beams of the HAPS. In this paper, the service area is defined as the region covered by terrestrial BSs; that is, we assume that the area is originally served by an existing terrestrial cellular CDMA system, and the role of the HAPS is to aid in signal reception by using a multibeam antenna. As mentioned above, when a call is made, the uplink signal is both received by a terrestrial antenna and a HAPS antenna. If a user locates close to the terrestrial BS, the required transmitting power would be smaller since its uplink signal can easily be received by the terrestrial antenna. On the contrary, if a user locates near the boundary of a terrestrial cell, the required transmitting power would also be smaller since the uplink signal can largely be received by the HAPS antenna. Note that, in a ground-based CDMA system or a HAPS CDMA system, the required transmitting power for a user locating at the boundary of a cell would in general be the largest and would introduce a lot of interference power. However, under the proposed scheme, two receive antennas each situate at the boundary of the coverage area of another System. Due to that the required transmitting power would be reduced for each user, the total interference generated in the integrated system is lowered, and the above mentioned problem is thus effectively alleviated. I have to submit this code on or before Tuesday(16th feb 2010)
From: John D'Errico on 14 Feb 2010 12:50 "Bernice Jacinth" <bjacinth(a)gmail.com> wrote in message <hl9bjk$q5m$1(a)fred.mathworks.com>... > Hello, > Greetings.I am undergraduate engineering student.I had sent an IEEE paper on "Interference reduction for terrestrial Cellular based systems via High Altitude platform Station" to a nearby institution.This has been selected for presentation and now i am asked for the MATLAB coding for this paper.I could not find it in Internet.Please help me...Kindly mail the algorithm of MATLAB coding or Code to bjacinth(a)gmail.com. (snip) > I have to submit this code on or before Tuesday(16th feb 2010) I'm sorry. You forgot to tell us how much you were willing to pay for us to do your work for you. My general hourly rate is a minimum of $100 per hour, with a minimum of one week (40 hours) of work for this. Others are likely to charge more than do I, but I am retired, so I can offer this cut rate to you if I would ever accept the job. (I'll tell you in advance that I'd never take this in a million years.) Perhaps a better solution is for you to learn to do your own work, on time, rather than wait until the last minute and then try to con someone else to do your work for you.
From: Oleg Komarov on 14 Feb 2010 14:51 "Bernice Jacinth" Nice try. A suggestion, next time just write this: I don't wanna do it since it's boring, will you do it for me (for free)? I assume it took you more time to write all those arguments than my oneliner but the result is obviously the same and it will always be (I can prove it with matlab :) ). Oleg
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