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Broadcast signal transmitting method and apparatus in wireless communication network

A wireless communication network and broadcast signal technology, which is applied in the field of wireless communication systems, can solve the problems of wasting pilot signals and low channel estimation accuracy broadcast signals, and achieve the effect of optimizing trade-offs

Active Publication Date: 2012-07-04
ALCATEL LUCENT SHANGHAI BELL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, once the base station selects a CP length, the base station will not adjust it according to whether the signal to be sent is a unicast signal or a broadcast signal
Similarly, if the pilot carrier spacing is specially designed for unicast signals, the channel estimation accuracy obtained is very low for broadcast signals due to its large spacing; on the contrary, if the pilot carrier spacing is specially designed for broadcast signals signal design, although it can also be applied to unicast signals, it undoubtedly wastes too many pilot signals

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  • Broadcast signal transmitting method and apparatus in wireless communication network
  • Broadcast signal transmitting method and apparatus in wireless communication network
  • Broadcast signal transmitting method and apparatus in wireless communication network

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Embodiment Construction

[0026] In order to facilitate the understanding of the following, the concepts appearing in it are explained as follows:

[0027] Delay Spread: Is a type of distortion due to multipath causing spreading or "smearing" of the received signal. Delay spread distortion occurs when the same signal arrives via different paths with different delays.

[0028] Hereinafter, without loss of generality, the present invention will be described by taking an OFDM system based on OFDM technology as an example. Those skilled in the art understand that since the idea of ​​the present invention is to use a special cyclic prefix and / or pilot density for broadcast signals, the present invention can be applied to any situation that needs to send pilots and / or pilots separately for broadcast and unicast signals. Systems using cyclic prefixes, including but not limited to OFDM-like systems.

[0029] The existing downlink frame structure in the OFDM system can also be expressed in the form shown in...

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Abstract

The present invention provides a method which is used for transmitting broadcast signal in a transmitter of network device of wireless communication network and a device thereof, and a method which is used for processing the received broadcast signal in a receiver of network device of wireless communication network and a device thereof, wherein, through using the circulating prefix which has different length with the single-broadcast signal and / or pilot signal with different density for the broadcast signal, the defect that all signals use the circulating prefix with same length and pilot signal with same density in prior art, thereby realizing optimized balancing between spectrum utilization and communication performance.

Description

technical field [0001] The present invention relates to a wireless communication system, in particular to a method and device for sending broadcast signals in a transmitter, and a method and device for processing received broadcast signals in a receiver. Background technique [0002] Currently, multi-carrier modulation technology has been widely used in the field of wireless communication, such as Orthogonal Frequency Division Multiplexing (OFDM) and Orthogonal Frequency Division Multiple Access (OFDMA). Since the multi-carrier modulation technology has strong anti-narrowband interference and anti-multipath fading capabilities, and also has flat fading characteristics on each subcarrier, the receiver using this technology has simple equalization complexity. Similarly, the single-carrier frequency-division multiple access (SC-FDMA) system (also known as discrete Fourier transform-extended OFDM system), which is collectively referred to as OFDM technology with orthogonal frequ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W48/10H04W48/16H04L27/26
Inventor 杨红卫
Owner ALCATEL LUCENT SHANGHAI BELL CO LTD