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Explain Forward CDMA Channel of IS-95A in detail? swathi 23-May-2008 08:12:29 AMComments It is used to carry traffic, and other controlling signals, and flows from BSS to MS. Posted by jahangir1983 It is used to carry traffic, and other controlling signals, and flows from BSS to MS. Posted by jahangir1983 It is used to carry traffic, and other controlling signals, and flows from BSS to MS. Posted by jahangir1983 It is used to carry traffic, and other controlling signals, and flows from BSS to MS. Posted by waqqas1 And also * FEC code rate is 1/2 and the PN rate is 1.2288 MHz (1.2288 MHz = 128*9600 bps). * The forward link consists of up to 64 logical channels (code channels). * Code channels are one of a set of 64 so-called Walsh functions. * Only whole periods of the Walsh functions occur in each code symbol, the Walsh makes the channels completely separable in the receiver. * Each forward code channel is spread by the Short Code, which has I- and Q-components. * The two coded, covered, and spread streams are vector-modulated on the RF carrier. The spreading modulation is thus QPSK, superimposed on a BPSK code symbol stream. Posted by meenakshi123 1.)From BSS to MS 2.)It carries traffic, a pilot signal, and overhead information. 3.)Pilot is a spread but unmodulated 4.)Pilot and overhead channels establish the system timing and station identity. 5.)Pilot channel is also used in the mobile-assisted handoff (MAHO) process as a signal strength reference. Posted by sagitraz |
Posted: 23-May-2008 10:51:46 AM By: sagitraz 1.)From BSS to MS 2.)It carries traffic, a pilot signal, and overhead information. 3.)Pilot is a spread but unmodulated 4.)Pilot and overhead channels establish the system timing and station identity. 5.)Pilot channel is also used in the mobile-assisted handoff (MAHO) process as a signal strength reference. | |
Posted: 24-May-2008 11:36:59 AM By: meenakshi123 And also * FEC code rate is 1/2 and the PN rate is 1.2288 MHz (1.2288 MHz = 128*9600 bps). * The forward link consists of up to 64 logical channels (code channels). * Code channels are one of a set of 64 so-called Walsh functions. * Only whole periods of the Walsh functions occur in each code symbol, the Walsh makes the channels completely separable in the receiver. * Each forward code channel is spread by the Short Code, which has I- and Q-components. * The two coded, covered, and spread streams are vector-modulated on the RF carrier. The spreading modulation is thus QPSK, superimposed on a BPSK code symbol stream. | |
Posted: 30-December-2008 06:43:57 AM By: waqqas1 It is used to carry traffic, and other controlling signals, and flows from BSS to MS. | |
Posted: 31-January-2009 12:50:17 PM By: jahangir1983 It is used to carry traffic, and other controlling signals, and flows from BSS to MS. | |
Posted: 31-January-2009 12:52:04 PM By: jahangir1983 It is used to carry traffic, and other controlling signals, and flows from BSS to MS. | |
Posted: 31-January-2009 12:52:41 PM By: jahangir1983 It is used to carry traffic, and other controlling signals, and flows from BSS to MS. |