WSP
The Signal Processor Unit (WSP)
performs RX and TX code channel processing,
coding, decoding and fast closed loop power control. The unit supports both
convolutional coding and Turbo coding.
The unit processes RX data sample signals from twelve receiver antennas (6 main
and 6 diversity). The WSP receives the antenna signals from the Summing and
Multiplexing Unit (WSM). There are six RX -buses per each WSP unit and every
RX -bus contains two antennas.
The spreaded TX data from the channel blocks of the WSP unit is directed either
to every TX antenna or to a subset of TX antennas (the WSMs take care of the
summing operation towards the TX antennas).
Up to 6 operating units can be used per sector, while up to 18 units can be installed
in a single cabinet. Every WSP unit provides 32 code channels. The number of
uplink and downlink code channels may vary; in softer hand over, more code
channels are needed in downlink than in uplink direction as RACH reception
needs code channel processing only in uplink.
Operation
The WSP unit has an uplink and a downlink. The unit takes care of several
functions in both ends. The functions are listed below.
The uplink performs the following functions
1 RAKE receiving
2 Physical channel decoding
3 Transport channel decoding
4 Deinterleaving
5 Rate matching
6 CRC calculation (cyclic redundacy check)
The downlink performs the following functions:
• Encoding
• Spectrum spreading
• Modulation
• Interleaving
• Rate matching
• CRC checking
• TPC (transmit power control)
The WSP unit has three external clocks available;
• BRCLK 61.44MHz master clock delivered by the WSC unit via the
Application Manager Unit (WAM)
• SFCLK 100MHz delivered by the WSC unit via the WAM unit. This clock
is used to give the frame start information to ASICs.
• SFN; system frame number is delivered by the WAM unit
The WSP unit communicates with the WAM unit via the OCI-bus. (see Section
2.2.3)
The WSP unit is equipped with a LED indicator on the front panel to indicate
different operational conditions.
Power control for the WSP unit includes hot insert logic, voltage supervisor for
each voltage (1.5V, 1.8V and 3.3V) and power on main reset control.
The reset logic keeps the WSP unit in a reset state for a short moment after the
voltages have been raised up to the required level.
The reset logic controls the voltage levels. If any of the voltages drop below the
required level, reset will appear to certain circuits and an alarm will be sent to
O&M.
The WSP unit consists of the following functional blocks
Channel block: Codec (4 pcs)
RAKE receiver (4 pcs)
MCU interface
There are four channel blocks in the WSP unit. Each block contains the following
items: one codec DSP, one SWS ASIC (including spreaders), and one TVD ASIC
(including Viterbi and Turbo).
A channel block performs the following functions
•Channel encoding: convolutional or Turbo coding
• Decoding (+ Viterbi and Turbo)
• Interleaving / deinterleaving
• Rate matching
• CRC checking / calculation
• Modulation
• Spreading
• Scrambling
TPC (transmit power control)
Encoding takes place in the SWS ASIC and in the CODEC DSP. Main functions
of the encoding are spreading, weighting and summing data, interruptions and
TPC insertion. SWS ASIC is connected to RAKE, DSP, other SWS ASICs, ATM
switches, and MCU (in a WAM unit).
Every WSP unit contains four channel blocks, and therefore, four encoding
blocks can be allocated to the downlink.
Decoding takes place in the TVD ASIC and in the CODEC DSP. The decoding
includes physical channel mapping, transport channel decoding and CRC
checking.
The DSPs are connected to the DSC bus which is used as a data bus between the
WSP and WAM units within one subrack.
The spreaders send spreaded and summed data to the WSM unit which sends
downlink data to the WTR unit.
There are four RAKE blocks on the WSP unit. Each RAKE has two IRAD ASICs
and one RAKE DSP. The DSP is connected to the WAM unit via DSC ASIC.
The RAKE receives uplink data from the WTR unit. The RAKE performs, for
example, the following functions
• Impulse response measurements
• Channel estimation
• Receiver fingers allocation
• Descrambling in fingers
• Despreading in fingers
• Maximum ration combining (MRC)
• Code tracking
• Closed loop power control
Signal to interference ratio (SIR) estimation
MCU interface
The WSP unit communicates with the WAM unit via the MCU interface (OCI-
bus). The interface includes one DSC ASIC, a LED control, a temperature sensor,
electrical serial number information, operation time register, HW -identification,
and AIF bus transceivers.
The MCU controls all DSPs via DSC bus that takes care of uplink and downlink
data traffic and alarm signalling between the WAM unit and the WSP unit.
The WSP unit is equipped with the following interfaces
One LED on the front panel
Back connectors
Front panel LED
A tri-colour LED on the WSP unit ́s front panel indicates the operational status of
the unit.
The LED indications are listed
Red = Faulty unit
Red, blinking Minor alarm
Yellow Transmission blocked for maintenance
purposes
Yellow, blinking Stand-by after start-up, SW downloading /
configuration
Green Normal operation, power on
performs RX and TX code channel processing,
coding, decoding and fast closed loop power control. The unit supports both
convolutional coding and Turbo coding.
The unit processes RX data sample signals from twelve receiver antennas (6 main
and 6 diversity). The WSP receives the antenna signals from the Summing and
Multiplexing Unit (WSM). There are six RX -buses per each WSP unit and every
RX -bus contains two antennas.
The spreaded TX data from the channel blocks of the WSP unit is directed either
to every TX antenna or to a subset of TX antennas (the WSMs take care of the
summing operation towards the TX antennas).
Up to 6 operating units can be used per sector, while up to 18 units can be installed
in a single cabinet. Every WSP unit provides 32 code channels. The number of
uplink and downlink code channels may vary; in softer hand over, more code
channels are needed in downlink than in uplink direction as RACH reception
needs code channel processing only in uplink.
Operation
The WSP unit has an uplink and a downlink. The unit takes care of several
functions in both ends. The functions are listed below.
The uplink performs the following functions
1 RAKE receiving
2 Physical channel decoding
3 Transport channel decoding
5 Rate matching
6 CRC calculation (cyclic redundacy check)
The downlink performs the following functions:
• Encoding
• Spectrum spreading
• Modulation
• Interleaving
• Rate matching
• CRC checking
• TPC (transmit power control)
The WSP unit has three external clocks available;
• BRCLK 61.44MHz master clock delivered by the WSC unit via the
Application Manager Unit (WAM)
• SFCLK 100MHz delivered by the WSC unit via the WAM unit. This clock
is used to give the frame start information to ASICs.
• SFN; system frame number is delivered by the WAM unit
The WSP unit communicates with the WAM unit via the OCI-bus. (see Section
2.2.3)
The WSP unit is equipped with a LED indicator on the front panel to indicate
different operational conditions.
Power control for the WSP unit includes hot insert logic, voltage supervisor for
each voltage (1.5V, 1.8V and 3.3V) and power on main reset control.
The reset logic keeps the WSP unit in a reset state for a short moment after the
voltages have been raised up to the required level.
The reset logic controls the voltage levels. If any of the voltages drop below the
required level, reset will appear to certain circuits and an alarm will be sent to
O&M.
The WSP unit consists of the following functional blocks
Channel block: Codec (4 pcs)
RAKE receiver (4 pcs)
MCU interface
There are four channel blocks in the WSP unit. Each block contains the following
items: one codec DSP, one SWS ASIC (including spreaders), and one TVD ASIC
(including Viterbi and Turbo).
A channel block performs the following functions
•Channel encoding: convolutional or Turbo coding
• Decoding (+ Viterbi and Turbo)
• Interleaving / deinterleaving
• Rate matching
• CRC checking / calculation
• Modulation
• Spreading
• Scrambling
TPC (transmit power control)
Encoding takes place in the SWS ASIC and in the CODEC DSP. Main functions
of the encoding are spreading, weighting and summing data, interruptions and
TPC insertion. SWS ASIC is connected to RAKE, DSP, other SWS ASICs, ATM
switches, and MCU (in a WAM unit).
Every WSP unit contains four channel blocks, and therefore, four encoding
blocks can be allocated to the downlink.
Decoding takes place in the TVD ASIC and in the CODEC DSP. The decoding
includes physical channel mapping, transport channel decoding and CRC
checking.
The DSPs are connected to the DSC bus which is used as a data bus between the
WSP and WAM units within one subrack.
The spreaders send spreaded and summed data to the WSM unit which sends
downlink data to the WTR unit.
There are four RAKE blocks on the WSP unit. Each RAKE has two IRAD ASICs
and one RAKE DSP. The DSP is connected to the WAM unit via DSC ASIC.
The RAKE receives uplink data from the WTR unit. The RAKE performs, for
example, the following functions
• Impulse response measurements
• Channel estimation
• Receiver fingers allocation
• Descrambling in fingers
• Despreading in fingers
• Maximum ration combining (MRC)
• Code tracking
• Closed loop power control
Signal to interference ratio (SIR) estimation
MCU interface
The WSP unit communicates with the WAM unit via the MCU interface (OCI-
bus). The interface includes one DSC ASIC, a LED control, a temperature sensor,
electrical serial number information, operation time register, HW -identification,
and AIF bus transceivers.
The MCU controls all DSPs via DSC bus that takes care of uplink and downlink
data traffic and alarm signalling between the WAM unit and the WSP unit.
The WSP unit is equipped with the following interfaces
One LED on the front panel
Back connectors
Front panel LED
A tri-colour LED on the WSP unit ́s front panel indicates the operational status of
the unit.
The LED indications are listed
Red = Faulty unit
Red, blinking Minor alarm
Yellow Transmission blocked for maintenance
purposes
Yellow, blinking Stand-by after start-up, SW downloading /
configuration
Green Normal operation, power on
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