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| 802.11n MIMO PHY & MAC IP |
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Overview |
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| SeaSolve’s implementation of the 11n PHY and MAC as per the IEEE P802.11n D1.07 Draft Standard provides chip companies, wireless device OEMs and others with a set of IP cores that have a competitive performance and design-flexibility advantage. The code is also fully integrated and compliant with the legacy IEEE 802.11a/b/g standard. The design and coding of the MIMO-OFDM algorithms is focused on achieving optimum numerical stability, performance and optimization. |
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| IEEE 802.11n PHY Features |
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Access Point: Full Specification implementation with coverage of all MCS: 0-76 and all operating modes as illustrated below. |
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Customizable implementation with selective features of MIMO 2x3, 2x2 etc. and selective MCS |
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Minimum and Mandatory specification implementation for client-STA devices |
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IEEE 802.11n includes Legacy fallbacks: 802.11a,b,g |
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Operating Modes verified for all MCS: 0-76. Extensive simulations performed to validate results through PER |
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Mixed Mode |
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Green Field Mode |
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Upper and Lower |
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Non-HT Mode |
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HT Duplication Mode |
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Non-HT Duplication mode |
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40 MHz Upper Mode |
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40 MHz Lower Mode |
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All Multi-antenna features: MIMO 5x4, 4x5, 4x4 3x4, 4x3, 3x3, 2x3, 2x2, 2x1, 1x1 and SIMO combinations like 1x2, 1x3, 1x4) |
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Counts Flags failure if the number of errors is more than correctable errors. |
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STBC |
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Spatial Mapping |
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Direct Mapping |
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Spatial Expansion |
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Beamforming Steering Matrix |
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Beamforming |
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Implicit Feedback Beamforming |
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Explicit Feedback Beamforming |
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CSI Matrices Feedback |
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Non-compressed Steering Matrix Feedback |
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Compressed Steering Matrix Feedback |
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Equalization |
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LS, MMSE, V-BLAST, ML, Sphere Decoding |
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System Impairments |
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CFO Estimation and correction |
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IQ imbalance estimation and correction |
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DC offset correction |
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Channel simulations: TGn Channel models |
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| PHY Test and Verification |
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Transmitter design verification for all MCS |
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Modulation Accuracy tests |
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Transmit center frequency leakage |
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Transmitter constellation error |
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EVM test. |
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Verify Receiver performance for Channel Models: A-F as defined by TGn |
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| IEEE 802.11n MAC Features |
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Functional Models implementation complete as per Draft P802.11n D1.07 (Dec.2006) |
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HT Capability signaling |
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MPDU aggregation – Transmission and Reception |
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MSDU aggregation – Transmission and Reception. |
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Block Acknowledgement |
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Protection mechanisms for different HT PHY options |
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Co-existence of 20 MHz and 40 MHz channels. |
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The entire functional model is an event driven single process running as a C application on Linux OS. It is a multi-threaded |
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implementation which is based on interrupts. |
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For real-time demonstration, MAC is partitioned into LMAC (lower MAC) and UMAC (upper MAC). The LMAC is RTL coded. |
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802.11 test as per UNHIOL test suites. |
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802.11 base STA MAC test suite version 2.1.1. |
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802.11e MAC QOS STA test suite version 0.3 |
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Linux 2.6 platform |
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802.11 Features |
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Full support for MIB configuration and SME and MLME interactions |
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An optional PHY stub for simulating PHY interaction including CCA |
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Indication and frame processing |
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An LLC stub for simulating LLC interaction and interfacing with the application |
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QOS Support using EDCA mechanism of 802.11e |
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Multiple Frame transmission support for video traffic |
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Mandatory features of 802.11n draft |
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| MAC Test and Verification |
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| The 802.11n MAC solution is verified on the following verification platform |
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Test bench consisting of two stations in the case of IBSS. |
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An AP stub which provides inputs for testing a station in an infrastructure BSS and provides responses to STA requests. |
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Test cases derived from University of New Hampshire Interoperability Lab |
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MAC conformance Test Suites |
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Application level test procedures to demonstrate file transfer between two stations with QoS differentiation. |
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| IEEE 802.11n PHY Transceiver Block Diagram |
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| IP Deliverables |
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Fixed Point Flat-MATLAB code: All functions are handwritten and contain no inbuilt Functions i.e., Viterbi, Convolutional Coding, |
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Reshape, nnz, Matrixinverse and SVD |
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Fixed point C/C++ as per customer requirements |
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RTL Deliverables as per customer requirements |
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