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Power allocation method for wireless broadcast multicast layered modulation

A technology of layered modulation and wireless broadcasting, applied in the field of wireless communication, which can solve the problems of high throughput of enhanced stream and small delay of basic stream, etc.

Inactive Publication Date: 2011-04-27
BEIJING UNIV OF POSTS & TELECOMM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the above-mentioned patent application, without mentioning how to reasonably allocate the power allocation factor, each layer is allocated a rate separately, so as to further minimize the delay of the basic stream and maximize the throughput of the enhanced stream.

Method used

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  • Power allocation method for wireless broadcast multicast layered modulation
  • Power allocation method for wireless broadcast multicast layered modulation
  • Power allocation method for wireless broadcast multicast layered modulation

Examples

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no. 1 example

[0055] layered modulation technique

[0056] According to the concept of layered modulation, the sender sends two different information streams: basic stream (also called basic layer) and enhanced stream (also called added layer or superimposed stream). The sender superimposes these two types of messages and sends them in a sending form. Generally, the transmit power of the basic stream is relatively large, and that of the enhanced stream is relatively small.

[0057] At the receiving end (user end), the elementary stream information is decoded first. In the process of decoding the elementary stream information, the superimposed stream information is used as interference. When decoding the enhanced stream information, the decoded and reconstructed elementary stream signal is subtracted from the total received signal to obtain the enhanced stream information and decode it, so as to obtain the decoded superimposed stream message. Generally, a receiver with better channel qu...

no. 2 example

[0087] Combine below Figure 7 The second embodiment will be described. For ease of description, this embodiment only describes the parts that are different from the first embodiment. For ease of description and understanding, the same reference numerals are used for steps in this embodiment that are the same as or similar to those in the previous embodiment.

[0088] Figure 7 The process of determining the λ value in the power allocation method for wireless broadcast multicast layered modulation according to the second embodiment of the present invention is shown. Each step in this process will be described in detail below.

[0089] Step S610, determine C u The expression expressed in λ, where C u For the throughput of the enhanced flow at the time of sending.

[0090] Step S620, determine K B The expression expressed in λ, where K B is the system delay estimated to enable a predetermined proportion H of users to receive the elementary stream.

[0091] Step S721, pr...

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Abstract

The invention discloses a power allocation method for wireless broadcast multicast layered modulation. In the method, a transmitting end allocates power lambda P to an elementary stream, allocates (1-lambda)P to an enhanced stream and transmits the elementary stream at a first user selected rate pb and the enhanced stream at a second user selected rate pe every time, until the user rate of receiving the elementary stream is presumed to be more than or equal to a preset rate H, wherein the lambda is a power allocation factor and is more than 0 and less than or equal to 1, and P is total power for transmitting the elementary stream and the enhanced stream; and the value of the lambda is determined to be the maximum value of the lambda, wherein Cu is throughput of the enhanced stream at the transmission finishing moment, KB is system time delay at the transmission finishing moment, Cu and KB are expressions of the lambda, and H is more than or equal to 90 percent. The invention provides an optimal power allocation method, and the system performance optimization is realized.

Description

technical field [0001] The invention relates to the technical field of wireless communication, in particular to a power distribution method in the wireless broadcast multicast layered modulation technology. Background technique [0002] No one doubts the great achievements of wireless communication in the past few years and the huge development potential contained in the future. With the rapid development of 3G, 4G and other technologies, wireless communication not only has higher requirements for plain text and low-rate message transmission, but also has an increasing demand for high-rate multimedia data services. Wireless broadcast and multicast services, such as mobile Internet access, mobile TV, etc., have gradually become the mainstream of wireless communication development because of their low application cost and efficient utilization of bandwidth. [0003] In the existing common broadcasting system, the transmission power and modulation and coding method of the tran...

Claims

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Application Information

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IPC IPC(8): H04W4/06H04W52/34H04W72/04
Inventor 张兴李秦梓胡春静刘洋王文博
Owner BEIJING UNIV OF POSTS & TELECOMM
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