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Capacity based rank prediction for MIMO design

A capacity and prediction method technology, applied in the field of communication, can solve the problems of reducing the total data rate, reducing the data rate, etc.

Inactive Publication Date: 2008-02-13
QUALCOMM INC
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the data rate supported by each layer is reduced, which reduces the total data rate

Method used

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  • Capacity based rank prediction for MIMO design
  • Capacity based rank prediction for MIMO design
  • Capacity based rank prediction for MIMO design

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Embodiment Construction

[0022] As used in this application, the word "exemplary" means "serving as an example, illustration or illustration". Any embodiment or design described herein as "exemplary" is not to be construed as preferred or advantageous over other embodiments or designs.

[0023] The performance-based rank prediction techniques described herein can be used in various communication systems such as Code Division Multiple Access (CDMA) systems, Wideband CDMA (WCDMA) systems, Direct Sequence CDMA (DS-CDMA) systems, Time Division Multiple Access (TDMA) system, frequency division multiple access (FDMA) system, high speed downlink packet access (HSDPA) system, system based on orthogonal frequency division multiplexing (OFDM), orthogonal frequency division multiple access (OFDMA) system, single input single output ( SISO) systems, multiple-input multiple-output (MIMO) systems, and the like.

[0024] OFDM is a multicarrier modulation technique that effectively divides the total system bandwidth...

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Abstract

The performance of a Single Code Word (SCW) design with low complexity MMSE receiver & rank prediction is similar to the Multiple Code Word (MCW) design with successive interference cancellation (SIC). A method of rank prediction comprises calculating MIMO channel matrices corresponding to layer transmissions for each tone, calculating signal-to-noise ratios (SNRs) for each tone based on the MIMO channel matrices, mapping the SNR for each tone to generate effective SNRs for each layer transmission, calculating additive white Gaussian noise (AWGN) capacities corresponding to the effective SNRs and maximizing an over-all spectral efficiency based on the AWGN capacities; and selecting a rank based on maximizing the over-all spectral efficiency.

Description

field of invention [0001] The present invention relates generally to communications, and in particular to methods for determining how to distribute data streams to be transmitted over multiple channels, such as Multiple Input Multiple Output (MIMO) Orthogonal Frequency Division Multiplexing (OFDM) communications system. Background technique [0002] In a wireless communication system, an RF modulated signal from a transmitter can reach a receiver via a large number of propagation paths. The characteristics of a propagation path generally change over time due to factors such as fading and multipath effects. To provide diversity against deleterious path effects and improve performance, multiple transmit and receive antennas may be used. If the propagation paths between these transmit and receive antennas are linearly independent (i.e., transmissions on one path cannot form a linear combination with transmissions on other paths), in general this is true at least to some exten...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/06H04L27/26H04J99/00
CPCH04L27/2608H04L27/2626H04L1/0003H04L25/03343H04L1/0071H04L5/0023H04L5/0046H04L5/006H04L1/0656H04L25/0242H04L1/0009H04L2025/03426H04L1/1812H04B17/006H04L25/0204H04L1/065H04L5/023H04L1/0026H04B17/336H04L27/26265H04B7/02H04L27/26
Inventor H·桑帕斯T·卡德斯
Owner QUALCOMM INC
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