 from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com) Copyright © 2004 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website. Radio and MS-PCUSN Interfaces Chapter 6 Pre-Coded Figure 6-35 Coding scheme-2. Headers and Data =290 bits 4 tail bits rate 1/2 convolutional = 294 Bits coding 588 bits Puncturing (132 bits) 456 bits Punctured Bits (except 12 specific bits) first maximum data throughput accepted by this coding scheme is 12 Kbps per time slot. Coding Scheme-3 (CS-3) For CS-3, shown in Figure 6-36, 16 bits are used for BCS and a CRC code is applied. USF bits are precoded (6 bits in total) to increase robustness. The half-rate convolutional coding (the same for CS-1) is punctured. The USF bits (first 12 bits) are not affected by puncturing. USF can be decoded either as a block code or as part of the data. The payload (radio block except USF and BCS) rate is 15.6 Kbps (312 bits/20 ms). Coding Scheme-4 (CS-4) For CS-4, shown in Figure 6-37, no FEC coding is applied. Sixteen bits are used for BCS and a CRC code is applied. USF are precoded (12 bits in total) with the same 12-bit code as for CS-2 and CS-3. USF can be decoded either as a block code or as part of the data. The payload (radio block except USF and BCS) rate is 21.4 Kbps (428 bits/20 ms) and the maxi- mum data throughput accepted by this coding scheme is 20 Kbps per time slot. Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com) Copyright © 2004 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website. Radio and MS-PCUSN Interfaces Radio and MS-PCUSN Interfaces Pre-Coded Figure 6-36 Coding scheme-3. Headers and Data =334 bits 4 tail bits rate 1/2 convolutional =338 bits coding 676 bits Puncturing (220 bits) 456 bits Punctured Bits first Figure 6-37 Coding scheme CS-4. Headers and Data = 447 bits No Coding Coding 456 bits Normal Burst The normal burst, shown in Figure 6-38 i