Parallel shift estimation for los mimo communication
US-2024106503-A1 · Mar 28, 2024 · US
Signal generating method and signal generating device
US8971432B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-8971432-B2 |
| Application number | US-201214110795-A |
| Country | US |
| Kind code | B2 |
| Filing date | Apr 18, 2012 |
| Priority date | Apr 19, 2011 |
| Publication date | Mar 3, 2015 |
| Grant date | Mar 3, 2015 |
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Abstract
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A transmission method for transmitting a first modulated signal and a second modulated signal in the same frequency at the same time. Each signal has been modulated according to a different modulation scheme. The transmission method applies precoding on both signals using a fixed precoding matrix, applies different power change to each signal, and regularly changes the phase of at least one of the signals, thereby improving received data signal quality for a reception device.
First claim
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The invention claimed is: 1. A transmission method comprising: applying precoding to a first modulated signal s 1 and a second modulated signal s 2 to generate a first precoded signal z′ 1 and a second precoded signal z′ 2 , the first modulated signal s 1 having been modulated by a first modulation scheme at a modulation level denoted by a, the second modulated signal s 2 having been modulated by a second modulation scheme at a modulation level denoted by b, and a and b being integers satisfying a<b; performing a phase change on at least one of the first precoded signal z′ 1 and the second precoded signal z′ 2 to generate a first transmission signal z 1 and a second transmission signal z 2 ; and transmitting the first transmission signal z 1 and the second transmission signal z 2 respectively from a first antenna and a second antenna at the same time at the same frequency, the precoding being represented by a precoding matrix F = 1 α 2 + 1 ( ⅇ j 0 α × ⅇ j o α × ⅇ j 0 ⅇ j π ) where α=0, a phase change scheme for the phase change being changed regularly, and the transmission method further comprising: performing a power change involving multiplication by a weighting factor u a and multiplication by a weighting factor u b , the weighting factor u a being used for the generation of the first transmission signal z 1 from the first modulated signal s 1 , the weighting factor u b being used for the generation of the second transmission signal z 2 from the second modulated signal s 2 , and the weighting factor u a and the weighting factor u b satisfying u a <u b . 2. A transmission apparatus comprising: a weighting unit applying precoding to a first modulated signal s 1 and a second modulated signal s 2 to generate a first precoded signal z′ 1 and a second precoded signal z′ 2 , a phase changer performing a phase change on at least one of the first precoded signal z′ 1 and the second precoded signal z′ 2 to generate a first transmission signal z 1 and a second transmission signal z 2 ; and a transmission unit transmitting the first transmission signal z 1 and the second transmission signal z 2 respectively from a first antenna and a second antenna at the same time at the same frequency, the first modulated signal s 1 having been modulated by a first modulation scheme at a modulation level denoted by a, the second modulated signal s 2 having been modulated by a second modulation scheme at a modulation level denoted by b, and a and b being integers satisfying a<b, the precoding being represented by a precoding matrix F = 1 α 2 + 1 ( ⅇ j 0 α × ⅇ j o α × ⅇ j 0 ⅇ j π ) where α=0, a phase change scheme for the phase change being changed regularly, and the transmission apparatus further comprising: a power changer performing a power change
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for beam forming · CPC title
construction details of matrices · CPC title
using phase diversity (e.g. phase sweeping) · CPC title
receiver computing weights based on information from the transmitter · CPC title
- H04B7/046Primary
taking physical layer constraints into account · CPC title
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- What does patent US8971432B2 cover?
- A transmission method for transmitting a first modulated signal and a second modulated signal in the same frequency at the same time. Each signal has been modulated according to a different modulation scheme. The transmission method applies precoding on both signals using a fixed precoding matrix, applies different power change to each signal, and regularly changes the phase of at least one of …
- Who is the assignee on this patent?
- Murakami Yutaka, Kimura Tomohiro, Ouchi Mikihiro, and 1 more
- What technology area does this patent fall under?
- Primary CPC classification H04B7/046. Mapped technology areas include Electricity.
- When was this patent published?
- Publication date Tue Mar 03 2015 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).