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Contention-based access channel design in MIMO OFDM/OFDMA systems

An orthogonal frequency division multiple access and access channel technology, applied in the transmission system, baseband system, pilot signal distribution, etc., can solve the problems of wasting wireless resources, poor performance, and unimproved waiting time

Inactive Publication Date: 2011-06-01
MEDIATEK INC
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the huge performance gap between the BW-REQ ranging code and the BW-REQ message, such designs may face a high probability of rolling back the 5-step BW-REQ ranging procedure, thus not increasing the latency, and Waste the radio resources in the BW-REQ message (radio resource)

Method used

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  • Contention-based access channel design in MIMO OFDM/OFDMA systems
  • Contention-based access channel design in MIMO OFDM/OFDMA systems
  • Contention-based access channel design in MIMO OFDM/OFDMA systems

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Embodiment Construction

[0025] Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0026] image 3It is a simplified structural diagram of a cellular MIMO OFDM / OFDMA system 31 for access channel transmission according to an embodiment of the present invention. The cellular MIMO OFDM / OFDMA system 31 includes a first mobile station 32 , a second mobile station 42 , and a base station 52 . On the transmission side, the first mobile station 32 includes a storage device 34, a processor 35, a MIMO encoder 36, a precoding / beamforming module 37, a first transmitter #1 coupled to an antenna 38, and a first transmitter #1 coupled to an antenna 39 The second transmitter #2. Similarly, the second mobile station 42 includes a storage device 44, a processor 45, a MIMO encoder 46, a precoding / beamforming module 47, a first transmitter #1 coupled to an antenna 48, and a first transmitter #1 coupled to an antenna 49. Second transmitter #2. On the r...

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Abstract

A contention-based multi-antenna access request transmission / receiving procedure in MIMO OFDM / OFDMA systems is provided to reduce access latency. A mobile station encodes and transmits an access request over a shared access channel using multiple transmitting antennas, while a base station receives and decodes a number of access requests using multiple receiving antennas. Each access request comprises an access indictor and an access message. In a first MIMO scheme, the mobile station transmits the access indicator as preambles, while the access message is encoded by SFBC / STBC to obtain spatial diversity. At the receive side, the access indicator is exploited as pilots for channel estimation. The access message is decoded using SFBC / STBC decoding algorithm. In a second MIMO scheme, the mobile station performs precoding / beamforming for each of the transmitting antenna to obtain beamforming gain, while the base station performs virtual beam matching based on the detection results of the access indicators.

Description

[0001] cross reference [0002] This application claims the following priority under 35 U.S.C. §119: U.S. Provisional Application No. 61 / 108,086, filed 2008 / 10 / 24, entitled "Contention-based Access Channel Designs with MIMO Support for OFDM / OFDMA Systems". The subject matter of which is hereby incorporated by reference. technical field [0003] The present invention relates to a wireless network communication, and in particular to a multi-input multi-output (Multi-Input Multi-Output, MIMO) Orthogonal Frequency Division Multiplexing (Orthogonal Frequency Division Multiplexing, OFDM) or Orthogonal Frequency Division Multiplexing Contention-based access channel design in an Orthogonal Frequency Division Multiple Access (OFDMA) system. Background technique [0004] In cellular systems (eg, OFDM or OFDMA wireless systems), access channels are commonly used by mobile stations to request access and take ownership of uplink data channels to enable (initiate) and base station (bas...

Claims

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Application Information

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IPC IPC(8): H04W16/00
CPCH04L5/0053H04L5/0023H04L5/0048H04L1/0631H04L1/0072H04L5/0094H04L25/0228
Inventor 廖培凯林志远陈义升
Owner MEDIATEK INC
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