EE535_Discussion_11_110907

EE535_Discussion_11_110907 - 9,9535 "/977‘00...

Info iconThis preview shows pages 1–9. Sign up to view the full content.

View Full Document Right Arrow Icon
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 2
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 4
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 6
Background image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 8
Background image of page 9
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: 9,9535 "/977‘00 Discussion 1! II 21.061933 - Rum LWAaW'J Mal/s. .. AkuMMfi $544K nod“ /\/o .’.' N g 1.5 1;]. .2. 74w a «(lawn “"4 “‘M‘I"? A aflvw /\/t :4 )r . 4‘?! wife 'wv‘w IV:1.‘41‘]:4].’? 12:4,“ w 4.4.3 it MS! Law}; L‘wu: C: , 7 G" .f‘ ‘ R~ “WM-K) =- (1%2f1 (‘9 41h iii-K)z — ‘ ~ 1/ ;. fiz’, 3,“.z‘+§¢j R‘ [2-4. Aduer w? cakes...“ («M it “my (L: (M M {LL 4w! am. 0/ Judo. 49 N: {5437.4}; :3 Mod, ‘4’ WV“? 4 -. _ g LR wGDoRi-nwgnj'nor ETWORKS CELLULAR SYSTEMS AND INFRASTRUCTURE-BASED WIRELESS N 512 Figure 15.5: Cell clusters for diamond cells. Figure 15.6: Channel assignment in hexagonal cells. sum - .._._..._~—.-....—..-.._-—«-.u.._._u.. _ -. ; . rum“ 15.2 CHANNEL m Figure 15.7: Cell clust We assign the first cl chain of hexagons ir hexagon chain in thl back to the original ( all directions starting j = 2. To assign chz ing from one of the c. can be made starting cell that has not been the iterative channel 2 is repeated until all cc ters as illustrated in F set is then D = x/gR with this process by f hexagonal cell is Ace” \/-3—Dz/2. Hence, the N _ A Cluslcr \— Accll 3 AS with diamond cells reuse distance D = R‘ N Interference and System Capacity 41 Using equation (2.3) the signal-to-interference ratio is given by 8/1 = (memr‘ = 36 = 15.56 dB. Since this is greater than the minimum required 8/] , N = l2 can be used. A / D+R \ I R D+R Figure 2.5 lllustrution of the first tier of co-channel cells for a cluster size ofN=7. When the mobile is at the cell Ilnundnry (point A), it experiences worst case co-channel interference on the forward channel. The murde distances between the mobile and different co-channel cells are based on approximations murle fol easy analysis. 2.5.2 Adjacent Channel Interference Interference resulting from signals which are adjacent in frequency to the desired signal is called adjacent channel interference. Adjacent channel interfer- ence results from imperfect receiver filters which allow nearby frequencies to leak into the passband. The problem can be particularly serious if an adjacent Channel user is transmitting in very close range to a subscriber’s receiver, while the receiver attempts to receive a base station on the desired channel. This is referred to us the near-far effect, where a nearby transmitter (which may or may ...
View Full Document

This note was uploaded on 05/04/2008 for the course EE 535 taught by Professor Zhang during the Fall '07 term at USC.

Page1 / 9

EE535_Discussion_11_110907 - 9,9535 "/977‘00...

This preview shows document pages 1 - 9. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online