IEEE published the 802.11ac standard in 2013. This book summarizes and explains the specification of this new Wi-Fi standard by IEEE. This specification is extremely complex to understand and the learning curve is steep. This book tries to alleviate difficulties and be useful for people who will study or may even develop software for 802.11ac devices. It is not about a specific chipset or device. The content discusses in details the MAC and PHY layers. There is a special attention to channel aggregation, MIMO, MU-MIMO, beam-forming as well as how Linux integrates 802.11ac drivers in the kernel. Nevertheless it tries to be easy to read when possible and it gives much contextual information. Jean-Pierre had first hand access to 802.11ac information as one of Orange's delegates to IEEE.

P. Duval was a missionary White Father in the Democratic Republic of Congo and Mexico, he is the author of more than thirty books. This book is a reflection on the evolution of the Catholic Church over the past 200 years, its successes but also failures. Pope Benedict XVI intends to solemnize the fiftieth anniversary of the Second Vatican Council, it will be the Year of Faith. Christians rejoice and expect fruitful outcomes, at a time which do not lack signs of a backward and neither of challenges. Diocesan and parish authorities are indeed now in the hands of men -still nothing more that men- who have not known the Church before the Council: how then could they appreciate what it brought, without having suffered from what has preceded it? The author is optimistic, even if you feel the disappointment of an elderly man who, like those of his generation, was never consulted on anything in an institution incorrigibly pyramidal; clearly indicating what seems to be warning signs, he hopes the Year of Faith will blow a new fresh breeze in a church where there are so many corners where to remove dust. This book strickes by the author's erudition and its knowledge experienced from the inside a church that is still looking 2000 years after Christ's teaching.