Moby Dick Consolidated System Integration Plan

D0103v1.doc Version 1 6.7.2003
The computational complexity of the RG will depend on the number of channels and/or antennae that are
required. It can range from a dual-processor server machine to a powerful 8-way SMP server (e.g.
COMPAQ Proliant 6500, 8500).
The MT is a normal Linux machine (e.g. laptop) and may be connected to a second machine via Ethernet
for running special applications.
Normal Linux Laptop
/dev/srnet
Kernel
Space
Layer1H/2/3
RT thread
Radio
Bearers
IP Networking subsystem
Linux Kernel
User
Application
Cardbus
DAQ
+
RF
Layer1L
RT thread
Real-time
µKernel
Real-time Space
User
Space
Figure 66: Mobile Terminal Architecture
4.3.4.2 Physical Layer Software Architecture
4.3.4.2.1 3GPP TDD 3.84 Mchips/s Physical Layer
Here we give a very brief summary of the 3GPP TDD 3.84 Mchip/s physical layer.
3GPP TDD 3.84 Mchip/s is a time-slotted CDMA system. Data frames last 10ms and are divided into 15
times slots of equal time duration (667 µs) as shown in figure 67.
FRAME i
10 ms
Slot
#0
Slot
#1
Slot
#14
2560 T c
T c = chip time = (1 / 3.84) µs
Figure 67: Frame Structure
Slots can be dynamically allocated for either uplink or downlink transmission which allows for the
possibility of asymmetric resource allocation for the two traffic directions.
The basic transmission entity in a slot is a burst. Bursts are further subdivided into 2560 QPSK symbols
(chips).
4.3.4.2.2 Implemented Physical Channels
Physical channels are indexed by their slot number and orthogonal channelization (spreading) code.
Spreading is used to allow several users to share a particular timeslot and as a means of achieving multilevel
coding.
On the uplink (UL) the maximum number of users sharing a particular timeslot is 8, and users can use at
most 2 channelization codes in parallel. On the downlink (DL) up to 16 parallel channelization codes can
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