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Concatenating precoder selection method

A technology of precoding matrix and weighting factor, applied in the separation device of transmission path, preventing/detecting errors through diversity reception, location diversity and other directions

Active Publication Date: 2011-07-20
HFI INNOVATION INC
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  • Application Information

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Problems solved by technology

However, precoder selection is still a challenge in multi-base MIMO since the signals from different base stations are not always combined coherently

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Embodiment Construction

[0016] Reference will be made in detail to embodiments of the invention, examples of which are illustrated in the accompanying drawings.

[0017] figure 1 is a simplified block diagram of a cellular OFDMA-based multi-base MIMO system 10 according to one embodiment of the present invention. The cellular OFDMA system 10 includes a plurality of neighboring base stations BS11-BS13 and a mobile station MS14. The base stations BS11-BS13 are connected to each other by backbone connections 15-17. MS14 is located at the cell edge of its serving base station BS12. For downlink (DL) transmissions, signals are sent from different base stations to the mobile station MS14. On the sending side, each base station (i.e. BS12) includes a storage device 31, a processor 32, a MIMO encoder 33 for encoding MIMO signals, a precoding and beamforming module 34, and a first transmitter #135 coupled to an antenna 36 , the second transmitter #237 coupled to the antenna 38. On the receiving side, th...

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Abstract

A method for concatenating precoder selection is provided for orthogonal frequency division multiple access (OFDMA)-based multi-base station (BS) multiple-input multiple-output (MIMO). A cell-edge mobile station first determines precoding matrix indexes (PMIs) for a serving base station and one or more cooperative base stations to optimize system performance. The mobile station then determines a plurality of corresponding weight factors for each of the base stations to further optimize system performance. The mobile station recommends the selected PMIs and weight factors to the serving base station, which shares the PMIs and weight factors with cooperative base stations. Each base station then applies precoding using the recommended PMIs and weight factors. The weight factors are quantized to reduce computation complexity and to facilitate information feedback. In one embodiment, the weight factors are determined based on a pre-defined 3-bit uniform phase quantization rule. The concatenated precoder leads to large performance gain without introducing high computation complexity.

Description

[0001] Cross References to Related Applications [0002] This application claims the following priority: No. 61 / 247,993, filed on 2009 / 10 / 2, titled "Concatenating Precoder Selection for OFDMA-Based Multi-BS MIMO" and No. 61 / 255,171, filed on 2009 / 10 / 27, US provisional application entitled "Multi-BS Phase Codebook Design." The subject matter of which is hereby incorporated by reference. technical field [0003] The disclosed embodiments of the present invention generally relate to wireless network communications, and in particular to OFDM for multiple-input multiple-output (MIMO) with multiple base stations (multi-BS). Precoder selection in an orthogonal frequency division multiple access (orthogonal frequency division multiple access, hereinafter referred to as OFDMA) system. Background technique [0004] In wireless communications, MIMO technology involves the use of multiple antennas at both the transmitter and receiver to improve communication performance. MIMO techn...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/02
CPCH04L25/03343H04L1/06H04B7/0639H04L5/0007H04B7/022
Inventor 林志远廖培凯
Owner HFI INNOVATION INC
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