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Technology Stocks : The New Qualcomm - a S&P500 company -- Ignore unavailable to you. Want to Upgrade?

To: marginmike who wrote (138)	7/24/1999 2:01:00 PM
From: Ron M	Respond to of 13582

A technical comparison of 3G alternates lifted from cudenver.edu Hell, I don't understand it I thought someone here might find it useful. Format is much better at the link. TABLE I: ARIB/ETSI/cdma2000 Comparison Table Japan (ARIB) Europe (ETSI) U.S. (cdma2000) MA Scheme WB DS-CDMA Duplex Scheme FDD & TDD Channel Spacing 1.25/ 5.0/10.0/20.0 MHz 5.0/10.0/20.0 MHz 1.25 MHz Chip Rate 1.024/4.096/ 8.192/16.384 Mcps 4.096/8.192/ 16.384 Mcps 1.23/3.69/ 7.37/11.1/14.7 Mcps Frame Length 10 ms 5 & 20 ms Inter BS Synchronization none synchronized Spreading Modulation ? Forward Complex-QPSK QPSK Complex-QPSK multicarrier optional Spreading Modulation - Reverse Complex-QPSK Complex-QPSK Pulse shaping Root-raised cosine (RRC), IS-95 - B Scrambling Codes ? Forward (cellsite ID) Partial GOLD code (1 frame; order 19) IS-95-B short m-sequences (length 2^15) (phase identifies base) Scrambling Codes ? Reverse Partial GOLD code (36,864 frames) Partial GOLD code (1 frame; order 41) IS-95-B short m-sequences (length 2^15) XOR IS-95-B, long m-sequences (length 2^41; mobile ID) User identification - Forward OVSF channelization code assignment is user specific long m-sequences XOR with data (length 2^41) User identification - Reverse Reverse GOLD scrambling code is user specific long m-sequences XOR with scrambling code (length 2^41) Channelization Codes ? Forward OVSF (Walsh family) variable length Walsh codes Channelization Codes ? Reverse (mobile ID) OVSF (Walsh family) variable length Walsh codes Data Modulation - Forward QPSK QPSK Data Modulation - Reverse BPSK QPSK BPSK Data Rates Supported kbps 4.096 Mbps max , , and 1036.8 and 2073.6 kbps also, kbps, , 2.0736 Mbps max Pilot Channel Strategy time-multiplex code-multiplex (common or auxiliary) Data Demodulation coh. using time multiplex pilot symbols & possibly pilot carrier coherent using time multiplex pilot symbols coherent using continuous code multiplex pilot Error Control convolutional code (<32 kbps) turbo codes (>32 kbps) convolutional code, concatenated RS & CC, turbo codes Convol. code (K=9; =1/2,3/8,1/3,1/4) (<14.1 kbps) turbo codes (K=4, R=1/2,1/3,1/4) (>14.4 kbps) Interleaving Depth 10, 20, or 80 ms 10, 20, 40, 80 ms 20 ms Power Control Forward & Reverse Forward & Reverse Power Control Rate 1600 Hz 800 Hz Power Control Delay 1 time slot Power Control Step 1 dB 0.25-1.5 dB 0.25, 0.5, 1.0 dB Power Control Range - Forward TBD 30 dB 128 dB +/- 24 dB (fast) Power Control Range - Reverse TBD 80 dB 128 dB (??) +/- 24 dB (fast) Multi-Rate Strategy shortened Walsh codes and multicode shortened Walsh codes and "supplemental" channels (multicode) Abbreviations used: BPSK: biphase-shift keying CDMA: code-division multiple access DS: direct sequence FDD: frequency-division duplex ID: identification kbps: kilobits per second Mcps: megachips per second MHz: megahertz ms: millisecond OVSF: orthogonal variable spreading factor QPSK: quadrature phase-shift keying RRC: root-raised cosine TDD: time-division duplex WB: wideband XOR: exclusive-OR