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Block Viterbi Decoder

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Overview

Viterbi decoding is an efficient algorithm for decoding convolutionally encoded sequences corrupted by channel noise back to the original sequence. In the digital transmit-receive system shown below the digital data stream (e.g., voice, image, or any packetized data) is encoded, modulated, and transmitted through a wired or wireless channel. A “noise” block connected to the channel symbolically denotes the channel noise. The data received from the channel at the receiver side is first demodulated and then decoded using the Viterbi decoder. The decoded output is equivalent to the transmitted digital data stream.
Digital Transmit Receive System - Block Viterbi Decoder

Digital Transmit Receive System - Block Viterbi Decoder

Lattice's Block Viterbi Decoder IP core is a parameterizable Viterbi Decoder for decoding different combinations of convolutionally encoded sequences. The decoder supports various code rates, constraint lengths, and generator polynomials. It also allows soft-decision decoding and is capable of decoding punctured codes. The core can operate in continuous or block modes, whichever is required by the channel. Either Tail Biting or Zero Flushing convolutional codes can be decoded in the block mode. All the configurable parameters, including operation mode, generator polynomials, punctured block size, and puncture pattern can be defined by the user to suit the needs of their application. The code rate and puncture pattern can also be changed dynamically through input ports during the operation of the decoder. Lattice’s Block Viterbi Decoder IP is compatible with many networking and wireless standards that use different methods of convolutional encoding at the encoder.

Features

Compatible with the following standards: IEEE 802.16-2004 SC PHY/ OFDM PHY, IEEEE802.11a, 3GPP, 3GPP2, and DVB-S
Supports multiple code rates: 1/2, 1/3, ... 1/7 for non-punctured codes, 2/3, 3/4, ..., 12/13 for punctured codes, and from m/(m+1) to m/(2m-1), where m is from 1 to 12, for dynamic punctured codes
Variable constraint length from 3 to 9
Supports dynamically variable code rates and puncture patterns
Dynamic BER estimation option
One-clock synchronous design
Hard or parameterizable soft decision decoding. Hard and soft decision for non-punctured codes and soft decision for punctured codes
Fully parallel or hybrid implementations. For a hybrid implementation, the degree of parallelism is parameterizable
Parameterizable trace-back length
Signed and unsigned representations for soft decision data
Supports parameterized puncturing patterns
Supports both continuous and block data input
Supports both Tail Biting and Zero Flushing block convolutional codes
Supports both one and two traceback schemes to cater to different coding scenarios

Performance and Resource Utilization

LatticeECP3¹
Parameter File	Parameters	SLICEs	LUTs	Registers	IOB	sysMEM EBRs	f_MAX(MHz)
IEEE 802.16a 2004-SC-PHY	See User's Guide	287	464	232	11	2	205
3GPP	See User's Guide	6318	11493	3628	13	16	141
DVB-S, IEEE 802.11a	See User's Guide	1611	2942	954	10	4	171
IEEE 802.16 2004-OFDM PHY (dynamic puncturing)	See User's Guide	1866	3261	1086	29	4	164
IEEE 802.16 2004-OFDM PHY (fixed puncturing)	See User's Guide	2013	3540	1231	13	4	172

^{1. Performance and utilization characteristics are generated using LFE3-95E-8FN672CES, with Lattice ispLEVER 7.2 SP1 software. When using this IP core in a different density, speed, or grade within the LatticeECP3 family, performance and utilization may vary.}

LatticeECP2M¹
Parameter File	Parameters	SLICEs	LUTs	Registers	IOB	sysMEM EBRs	f_MAX(MHz)
IEEE 802.16a 2004-SC-PHY	See User's Guide	289	466	232	11	2	213
3GPP	See User's Guide	6343	11510	3628	13	16	132
DVB-S, IEEE 802.11a	See User's Guide	1620	2948	954	10	4	158
IEEE 802.16 2004-OFDM PHY (dynamic puncturing)	See User's Guide	1896	3266	1084	29	4	170
IEEE 802.16 2004-OFDM PHY (fixed puncturing)	See User's Guide	2008	3517	1229	13	4	169

^{1. Performance and utilization characteristics are generated using LFE2M-35E-7F672C, with Lattice ispLEVER 7.2 SP1 software. When using this IP core in a different density, speed, or grade within the LatticeECP2M/S family, performance and utilization may vary.}

LatticeECP2¹
Parameter File	Parameters	SLICEs	LUTs	Registers	IOB	sysMEM EBRs	f_MAX(MHz)
IEEE 802.16a 2004-SC-PHY	See User's Guide	289	466	232	11	2	184
3GPP	See User's Guide	6343	11510	3628	13	16	150
DVB-S, IEEE 802.11a	See User's Guide	1620	2948	954	10	4	179
IEEE 802.16 2004-OFDM PHY (dynamic puncturing)	See User's Guide	1896	3266	1084	29	4	137
IEEE 802.16 2004-OFDM PHY (fixed puncturing)	See User's Guide	2024	3546	1235	13	4	168

^{1. Performance and utilization characteristics are generated using LFE2-50E-7F484C, with Lattice ispLEVER 7.2 SP1 software. When using this IP core in a different density, speed, or grade within the LatticeECP2/S family, performance and utilization may vary.}

LatticeEC/P¹
Parameter File	Parameters	SLICEs	LUTs	Registers	IOB	sysMEM EBRs	f_MAX(MHz)
IEEE 802.16a 2004-SC-PHY	See User's Guide	274	451	232	11	2	139
3GPP	See User's Guide	5309	9941	3653	13	16	101
DVB-S, IEEE 802.11a	See User's Guide	1366	2557	967	10	4	106
IEEE 802.16 2004-OFDM PHY (dynamic puncturing)	See User's Guide	1570	2881	1082	29	4	109
IEEE 802.16 2004-OFDM PHY (fixed puncturing)	See User's Guide	1821	3339	1224	13	4	108

^{1. Performance and utilization characteristics are generated using LFEC20E-5F672C, with Lattice ispLEVER 7.2 SP1 software. When using this IP core in a different density, speed, or grade within the LatticeECP/EC family, performance and utilization may vary.}

LatticeSC/M¹
Parameter File	Parameters	SLICEs	LUTs	Registers	IOB	sysMEM EBRs	f_MAX(MHz)
IEEE 802.16a 2004-SC-PHY	See User's Guide	265	434	233	11	2	229
3GPP	See User's Guide	5063	9417	3636	13	16	199
DVB-S, IEEE 802.11a	See User's Guide	1272	2431	923	10	4	215
IEEE 802.16 2004-OFDM PHY (dynamic puncturing)	See User's Guide	1491	2694	1097	29	4	214
IEEE 802.16 2004-OFDM PHY (fixed puncturing)	See User's Guide	1833	3288	1246	13	4	215

^{1. Performance and utilization characteristics are generated using LFSCM3GA25E-7F900C, with Lattice ispLEVER 7.2 SP1 software. When using this IP core in a different density, speed, or grade within the LatticeSC/M family, performance and utilization may vary.}

LatticeXP2¹
Parameter File	Parameters	SLICEs	LUTs	Registers	IOB	sysMEM EBRs	f_MAX(MHz)
IEEE 802.16a 2004-SC-PHY	See User's Guide	289	466	232	11	2	163
3GPP	See User's Guide	6343	11510	3628	13	16	135
DVB-S, IEEE 802.11a	See User's Guide	1620	2948	954	10	4	161
IEEE 802.16 2004-OFDM PHY (dynamic puncturing)	See User's Guide	1896	3266	1084	29	4	152
IEEE 802.16 2004-OFDM PHY (fixed puncturing)	See User's Guide	2024	3546	1235	13	4	151

^{1. Performance and utilization characteristics are generated using LFXP2-17E-7F484C, with Lattice ispLEVER 7.2 SP1 software. When using this IP core in a different density, speed, or grade within the LatticeXP2 family, performance and utilization may vary}

LatticeXP¹
Parameter File	Parameters	SLICEs	LUTs	Registers	IOB	sysMEM EBRs	f_MAX(MHz)
IEEE 802.16a 2004-SC-PHY	See User's Guide	274	451	232	11	2	119
3GPP	See User's Guide	5309	9941	3653	13	16	85
DVB-S, IEEE 802.11a	See User's Guide	1366	2557	967	10	4	99
IEEE 802.16 2004-OFDM PHY (dynamic puncturing)	See User's Guide	1570	2811	1082	29	4	100
IEEE 802.16 2004-OFDM PHY (fixed puncturing)	See User's Guide	1821	3339	1224	13	4	98

^{1. Performance and utilization characteristics are generated using LFXP20E-5F256C, with Lattice ispLEVER 7.2 SP1 software. When using this IP core in a different density, speed, or grade within the LatticeXP family, performance and utilization may vary.}

Ordering Information

Family

Part Number

LatticeECP3

VTERB-BLK-E3-U4

LatticeECP2M

VTERB-BLK-PM-U4

LatticeECP2

VTERB-BLK-P2-U4

LatticeECP/EC

VTERB-BLK-E2-U4

LatticeSC

VTERB-BLK-SC-U4

LatticeXP2

VTERB-BLK-X2-U4

LatticeXP

VTERB-BLK-XM-U4

IP Express Version: 4.4
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